[4] Background Art [5] [6] Conventional catalysts for disintegrating vapor phase chemicals induding bad- smeling materials have been able to perform their functions only at a high temperature of more than 100 ° C, and materials to which the catalysts can show their disin- tegrating function were limited (JP 2001-38207 and US 6,344, 987). Accordingly, it was impossible to utilize the conventional disintegration catalysts for disintegrating bad-smeling materials in the actual fife or for disintegrating industrial volatile materials at a low temperature of less than 100 ° C. In order to utilize such catalysts, the temperature of the vapor phase compounds have to be maintained at more than 100 ° C or the vapor phase compounds have to be artificial heated so as to have a temperature of more than 100 ° C. As the result, many problems have occurred, for example, the appllicalifity of the catalyst was very limited, and that it was very expensive to disintegrate vapor phase chemicals.

[7] Disclosure of Invention Technical Problem [8] [9] Therefore, an object of the present invention is to provide a ceramic catalyst having absorption and disintegration properties for vapor phase compounds even at a bw temperature of less than 100 ° C regardess of an assistance of fight, and a preparation method thereof.

[10] To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a porous ceramic catalyst containing a metal oxide capable of absorbing and disin- tegrating vapor phase chemicals obtained by immersing water-soluble metal salt in a porous ceramic material, firing, and then unifomiy dispersing a metal oxide in the ceramic material, and a preparation method thereof.

[11] The foregoing and other objects, features, aspects and advantages of the present invention wil become more apparent from the flowing detailed description of the present invention when taken in conjunction with the accompanying drawings.

[12] Technical Solution [13] [14] Reference wit now be made in detail to the preferred embodiments of the present invention, examples of which are ilustrated in the accompanying drawings.

[15] The present invention relates to a ceramic catalyst having absorption and disin- tegration properties for vapor phase chemicals and a preparation method thereof. In particular, the present invention relates to a metal oxide contained porous ceramic catalyst capable of absorbing and disintegrating vapor phase chemicals which is obtained by impregnating a water-sduble metal salt into ceramic material and then firing to disperse a metal oxide therein and a preparation method thereof.

[16] A porous ceramic catalyst containing a metal oxide of the present invention is a non-photoassisted room temperature catalyst capable of disintegrating vapor phase organic compounds at a bw temperature such as an ordinary room temperature regardless of fight, and can easily disintegrate organic vapor phase compositions without additional irradiating fight or without additional heating temperature up to a high temperature.

[17] The present invention provides a porous ceramic catalyst containing a metal oxide capable of absorbing and disintegrating vapor phase compositions at a bw temperature, obtained by mixing a mixture of 70 to 99.5 wt% of a porous ceramic material and 0.5 to 30 wt% of a water-soluble metal salt with water, then shaping, drying and firing, to make a metal oxide derived from the metal salt unifomiy dispersed in the ceramic material. The porous ceramic catalyst of the present invention may also be obtained by further adding a combustible material to the mixture of the porous ceramic material and the water-soluble metal salt and mixing, wherein the added amount of the combustible material is 70 wt% or less based on the total weight of the mixture of the porous ceramic material and the water-sduble metal salt. The porous ceramic catalyst of the present invention may also be additional coated with metal salt aqueous solution in which 1 to 20 wt% of a water-sduble metal salt is dissolved.

[18] Further, the present invention is to provide a preparation method of a porous ceramic catalyst containing a metal oxide comprising the steps of : [19] (a) mixing 70 to 99.5 wt% of a porous ceramic material with 0.5 to 30 wt% of a water-sduble metal salt [20] (b) kneading the obtained mixture with water and then shaping as a desired shape; and [21] (c) sufficiently drying the shaped material at an ordinary room temperature, and firing at a temperature of 40 0 ° C to 1, 400 ° C to make a metal oxide derived from the metal salt uniformy dispersed in the shaped material.

[22] Further, the preparation method of a porous ceramic catalyst may comprise the step of additionaly mixing the mixture of the porous ceramic material and water-sduble metal salt with a combustible material, wherein the amount of the combustible material is 70 wt% or less based on the weight of the mixture of the porous ceramic material and water-soluble metal salt.

[23] After the step (c), the preparation method of a porous ceramic catalyst may further comprise the step (d) of impregnating the obtained porous ceramic catalyst containing a metal oxide into metal salt aqueous sdution containing 1 to 20 wt% of water- sdution metal salt for at least five minutes, sufficiently drying, and secondarily firing at a temperature of 40 0 ° C to 1, 400 ° C, to coat the porous ceramic catalyst containing a metal oxide with a metal oxide.

[24] The porous ceramic material used in the present invention is preferably a powder form, and may be one or more materials selected from a group consisting of porous alumina (Al2O3), day, kaolin, flint pebble, pottery stone, feldspar, veinstone, zeolite, bentonite, aluminum compounds (e.g., aluminum sulfate), a fired material containing at least 10 wt% of porous alumina and at least 50 wt% of porous silica (SiO).

2 [25] The water-sduble metal salt used in the present invention may be one or more materials selected from a group consisting of water-sduble cobalt salts [e. g. , Co (C H 2 3 O2)2], magnesium salts [e.g., Mg(C2H3O)2], strontium salts [e.g., Sr(C2H3O2)2], barium salt [e.g., Ba(C2H3O2)2], vanadium salts [e.g., V2(SO4)3], chrome salts [e.g., Cr(NO3)3], manganese salts [e.g., Mn(C2H3O2)2], ferric salts (e.g., FeCl3), nickel salts (e.g., NiSO4 ), copper salts (e.g., CuCl2), zinc salts (e.g., ZnCl2), cadmium salts [e.g., Cd(C2H3O2)2], tin salts (e.g., SnCl2), bithmuth salts (e.g., BiPO@), sodium salt [e.g., sodium 2 4 hydroxide (NaOH), sodium sulfide (NaS), sodium sulfate (Na SO), sodium sulfite (Na 2 4 2 SO), sodium iodide (NaI)], calcium hydroxide [Ca (OH)], fithium hydroxide (LiOH), 3 2 potassium hydroxide (KOH) and barium hydroxide [Ba (OH)2]. More preferably, the water-sduble metal salt may be a water-sduble cobalt salt [e. g. , Co (C H O)], or a 2 3 2 2 mixture of the water-soluble cobalt salt with one or more salts selected from the group consisting of magnesium salts [e.g., Mg(C2H3O2)2], strontium salts [e.g., Sr(C2H3O2)2], barium salts [e.g., Ba(C@H@O@)@], vanadium salts [e.g., V@(SO@)@], chrome salts [e.g., 2 3 2 2 2 4 3 Cr(NO3)3], manganese salts [e.g., Mn(C2H3O2)2], ferric salts (e.g., FeCl3), nickel salts (e.g., NiSO4), copper salts (e.g., CuCl2), zinc salts (e.g., ZnCl2), cadmium salts [e.g., Cd(C@H@O@)@], tin salts (e.g., SnCl@), bithmuth salts (e.g., BiPO@), sodium salt [e.g., 2 3 2 2 2 4 sodium hydroxide (NaOH), sodium sulfide (NaS), sodium sulfate (Na SO), sodium 2 4 sulfite (Na SO), sodium iodide (NaI)], calcium hydroxide [Ca (OH)], fithium 2 3 2 hydroxide (LiOH), potassium hydroxide (KOH) and barium hydroxide [Ba (OH)2].

[26] The above water-sduble metal salts have a characteristic to be changed into a cor- responding metal oxide, when fired at a temperature of 400 ° C to 1400 ° C. Ac- cordingly, by mixing the water-sduble metal salt and a porous ceramic material with water and then firing the mixture at a temperature of 400 ° C to 1400 ° C, a ceramic catalyst in which a metal oxide is unifomiy dispersed in ceramic layers can be obtained.

[27] In the present invention, a combustible material may be optionaly used. The combustible material is preferably a powder form, and can be completely disintegrated into water, carbon dioxide and so forth, by being reacted with oxygen at a high temperature. The combustible material may be a powder type hydrocarbon compound consisting of carbon, hydrogen and oxygen, such as adipic acid, melanin, sugar, stearic acid, paraffin, etc.; a powder type carbon compound such as carbon black, fine coal, graphite powder, etc.; or a mixture thereof. The combustible material is completely disintegrated into water and carbon dioxide to form a porous ceramic layer having a uniform pore, when mixed with a ceramic material, and fired at a temperature of 40 0 ° C to 1, 400 ° C.

[28] The vapor phase compounds which can be absorbed and/or disintegrated by the ceramic catalyst of the present invention indude al odorous materials, and especialy indude aldehydes, alcohols, amines and benzenes.

[29] Hereinafter, a preparation method of the ceramic catalyst having absorption and disintegration properties for vapor phase compounds according to the present invention wit be ilustrated in more detail.

[30] Step (a) : 70 to 99.5 wt% of the ceramic material in a porous powder form is mixed with 0.5 to 30 wt% of the water-sduble metal salt so that the total weight can be 100%. When the amount of the water-sduble metal salt is less than 0.5 wt%, the amount of the metal oxide derived therefrom is deficient, whereby the disintegration ability of a final product is greatly deteriorated. When the amount of the water-soluble metal salt exceeds 30 wt%, the derived metal oxide is unevenly dispersed in ceramic pores, whereby the disintegration ability is deteriorated. Most preferably, 0.5 to 10 wt% of the water-soluble metal salt may be used.

[31] In order to form a porous ceramic layer having more uniform pores in size and dis- tribution, a combustible material may be added to and mixed with the mixture of the ceramic material and the water-sduble metal salt, in the amount of 70 wt% or less based on the weight of the mixture. When the amount of the combustible material exceeds 70 wt% of the weight of the mixture of the ceramic material and the water- sduble metal salt, the formed pores are too large or can be destroyed. Most preferably, 25 to 65 wt% of the combustible material is used.

[32] Step (b) : Then, the mixture of the ceramic material, the water-sduble metal salt and the optional combustible material is kneaded with water and shaped into a desired form. Preferably, water is used in the amount of 50 to 250 wt% based on the total weight of the solid materials. When the amount of water is less than 50 wt% of the total sdid materials, the kneaded paste is so crumbly that the water-sduble metal salt con not be uniforrdy dispersed in the ceramic pore. Also, when the amount of water is more than 250 wt% of the total solid materials, a problem can be caused in forming pores in the ceramic catalyst during a drying or firing process.

[33] It is preferable to repeatedly perform the mixing process and the kneading process so that the water-sduble metal salt can be unifomiy impregnated into the pores of the porous ceramic material in the condition of being dissdved in water.

[34] Step (c) : Subsequently, the shaped material obtained in said process is sufficiently dried at an ordinary room temperature and fired at a temperature of 40 0 ° C to 1, 400 ° C, whereby the metal oxide derived from the metal salt can be unifomiy dispersed into the pores of the ceramic material, to fabricate the porous ceramic catalyst containing a metal oxide of the present invention. When the firing temperature is bwer than 400 ° C, the water-sduble metal salt is not disintegrated, whereby a metal oxide can not be generated in the ceramic layer. When the firing temperature is higher than 1400 ° C, the generated metal oxide or metal may be changed into a liquid state to be extricated. Preferably, the firing time is bnger than one hour.

[35] Step (d) : Optionaly, further to said processes, the porous ceramic catalyst containing a metal oxide may be immersed for at least five minutes into metal salt aqueous solution in which 1 to 20 wt% of water-sduble metal salt is dissdved, and then sufficiently dried. Then, the porous ceramic catalyst is secondary fired at the temperature of 40 0 ° C to 1, 400 ° C to prepare a ceramic catalyst coated with a metal oxide. By said coating, the ceramic catalyst has various pores and disintegration properties. When the amount of water-sduble metal salt contained in the metal salt aqueous solution is less than 1 wt%, the amount of a metal oxide generated from the metal salt to be coated on the ceramic material is very little to deteriorate the coating effect. Also, when the amount of water-sduble metal salt contained in the metal salt aqueous solution is more than 20 wt%, the amount of the generated metal oxide is excessive to greatly bwer the uniformity of the metal oxide coating. Most preferably, the contend of the metal salt in the metal salt aqueous sdution is approximately 5 to 15 wt%. Preferably, the secondary firing temperature is 40 0 to 1, 400 ° C, and the firing time is bnger than 30 minutes.

[36] The porous ceramic catalyst according to the present invention has excelent absorption and disintegration properties for vapor phase organic compounds even at a low temperature of bwer than 1 00 ° C, such as an ordinary room temperature (approximately 25 ° C), and has an abity to disintegrate water and carbon dioxide at a high temperature of higher than 1 00 ° C.

[37] FIG. 1 shows a preparation process of a ceramic catalyst according to one embodiment of the present invention, in which the fdbwing processes are carried out subsequently: Mixing Process (1) of mixing water-soluble metal salt A, ceramic material B, and combustible material C to obtain the mixture thereof having a uniform composition ratio; Shaping Process (2) of adding distiled water D to the mixture in an amount enough to completely dissdve the water-sduble metal salt and kneading to shape into the desired form; Drying Process (3) of sufficiently drying the shaped catalyst material at an ordinary room temperature; and firing Process (4) of firing the shaped catalyst material at a temperature of 40 0 to 1, 400 ° C.

[38] FIG. 2 shows an experimental apparatus for disintegrating vapor phase organic compounds used in the present invention. For an experiment, gas or vaporous compound is injected into a hermetic sealed stainless container 1 through a septum 2 until the concentrate thereof reach to the desired level. When the compounds to be injected are liquid phase, the compounds are injected into an evaporation plate 3 to gradualy vaporize. A catalyst for absorbing and disintegrating vapor phase compounds is inputted to a catalyst input (stacked) vessel 4 having a bottom of a 500 mesh stainless wire netting. A fan 5 connected to an external power source through an electric wire and a concent 6 blows fluid inside the stainless container 1 to the bottom of the catalyst stacked vessel to continuously circulate the fluid inside the stainless container.

[39] Advantageous Effects [40] [41] The ceramic catalyst of the present invention can absorb and disintegrate vapor phase composition even at a bw temperature of bwer than 100 ° C, especialy, at an ordinary room temperature of approximately 25 °C, without fight assistance.

[42] Description of Drawings [43] [44] The accompanying drawings, which are induded to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, ilustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

[45] [46] In the drawings: [47] FIG. 1 shows a preparation process of a ceramic catalyst according to one embodiment of the present invention, in which each reference numeral denotes the fdows ; [48] A: water-sduble metal salt, [49] B: ceramic material, [50] G combustible material, [51] D: distiled water, [52] E: catalyst, [53] 1: mixing process, [54] 2: shaping process, [55] 3: drying process, and [56] 4: firing process.

[57] FIG. 2 shows an experimental apparatus for disintegrating vapor phase organic compounds used in the present invention, in which each reference numeral denotes the fdows ; [58] 1: hermetic sealed reaction container, [59] 2: septum, [60] 3: evaporation plate, [61] 4: catalyst input vessel, [62] 5: fan, and [63] 6: electric contrer.

[64] Best Mode [65] Examples [66] Example 1: Disintegration property of ceramic catalyst depending on the ceramic material used [67] [68] 90 weight parts of ceramic material is mixed with 1 weight part of each of ferric chbride, manganese acetate, vanadium sulfate, magnesium acetate, cobalt acetate, zinc chbride, cadmium acetate, barium nitrate and tin chbride. Then, 50 weight parts of stearic acid powder with an average partide diameter of 20 um was added to the mixture to prepare a ceramic catalyst material mixture. As the ceramic material, as shown in the fdowing table 1, porous alumina, kadin, veinstone, zedite and a fired material containing 50 wt% of porous alumina and 50 wt% of porous silica were in- dividualy used.

[69] To the mixture, distiled water in the same weight as the mixture was added, and kneaded. then, the kneaded mixture was shaped as the cylindrical shape with the diameter of 3 cm and the length of 10 cm, and dried for 72 hours at an ordinary room temperature. The dried material was fired in an electric oven for 10 hours at the temperature of 1000 ° C, and then coded at an ordinary room temperature to fabricate a ceramic catalyst.

[70] The obtained cyfindrical ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catalyst was inputted to an ex- perimental device (fig. 2) for disintegrating vapor phase organic compounds. After the experimental device was sealed, 1000 ppm of propionic aldehyde (C H CHO) was 2 3 injected into the experimental device through the septum, and then maintained for 24 hours at an ordinary room temperature (25 °C to 30 °C) and 60 °C, respectively. The disintegration ratio for propionic aldehyde inside the experimental device was measured by using a gas chromatography (HP-5890). The result was shown in the fdowing table 1.

[71] [72] [Table 1] Ceramic material Disintegration ratio (vdume%) Ordinary room 60 ° C temperature Porous alumina 3 6 Kadis 3 7 Veinstone 4 9 Zeolite 6 15 fired material containing porous alumina and 5 12 silica [73] [74] Example 2: Disintegration property 1 of ceramic catalyst depending on metal oxide [75] [76] 97 weight parts of ceramic material in which 20 weight parts of porous alumina, 20 weight parts of kadin, 20 weight parts of zedite, 20 weight parts of veinstone, and 20 weight parts of bentonite were mixed, 2 weight parts of cobalt acetate, and 1 weight parts of water-soluble metal salt as shown in the fdowing table 2 were mixed with one another. Then, 60 weight parts of fine coal powder with an average diameter of 0.2 mn was added to the mixture to prepare a ceramic catalyst material mixture.

[77] The mixture was mixed with distiled water in the 1.5-times weight of the mixture, and kneaded. Then, the kneaded mixture was shaped as a cylindrical shape having the diameter of 3 cm and the length of 10 cm, and then dried for 72 hours at an ordinary room temperature. The dried material was fired in an electric furnace for 12 hours at the temperature of 1100 ° C, and then coded at an ordinary room temperature to fabricate a ceramic catalyst.

[78] The obtained cyfindrical ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catalyst was inputted to the ex- perimental device (Fig. 2) for disintegrating vapor phase organic compounds. After the experimental device was sealed, 1000 ppm of butand (C H OH) was injected to the 4 9 experimental device through the septum, and then maintained for 24 hours at an ordinary room temperature (25 °C to 30 °C) and 60 °C, respectively. The disin- tegration ratio for butand inside the experimental device was measured by using a gas chromatography (HP-5890). The result was shown in the fdowing table 2.

[79] [80] [Table 2] Water-soluble metal salt Disintegration ratio (volume %) Ordinary room 60 °C temperature Magnesium acetate (Mg(C2H3O2)2) 2 5 Strontium acetate (Sr(C2H3O2)2) 3 8 Barium nitrate (Ba(NO3)2) 2 4 Vanadium sulfate (V@(SO@)@) 5 12 2 4 Chrome nitrate (Cr(NO3)3) 4 10 Manganese acetate (Mn(C2H3O2)2) 3 7 Ferric chioride (FeCl@) 2 5 Nickel sulfate (NiSO4) 3 7 Copper chloride (CuCl@) 3 6 2 Zinc chbride (ZnCl@) 2 5 2 Cadmium acetate (Cd (C HO)) 4 9 2 3 2 2 Tin chloride (SnCl2) 2 4 Bithmuth phosphate (BiPO@) 3 5 4 Calcium hydroxide (Ca (OH@) 4 9 2 Lithium hydroxide (LiOH) 3 7 Sodium hydroxide (NaOH) 3 6 Potassium hydroxide (KOH) 4 8 Barium hydroxide (Ba(OH)2) 2 5 Sodium sulfide(NaS) 3 7 Sodium sulfate(Na2SO4) 4 8 Sodium sulfite(Na@SO@) 4 9 2 3 Sodium iodide (NaI) 5 [81] [82] As shown in the above table 2, a ceramic catalyst of the present invention prepared by mixing a ceramic material with water-soluble metal salt and firing the mixture to disperse a metal oxide generated from the metal salt in the ceramic material has excelent absorbing and disintegrating properties for vapor phase organic compounds at a bw temperature of bwer than 100 °C, especialy, at an ordinary room temperature of approximately 25 °C.

[83] [84] Example 3: Disintegration property 2 of ceramic catalyst depending on metal oxide [85] [86] 97 weight parts of ceramic material, in which 20 weight parts of porous alumina, 20 weight parts of feldspar, 20 weight parts of zeolite, 20 weight parts of veinstone, and 20 weight parts of bentonite were mixed, was mixed with 2 weight parts of cobalt acetate and 1 weight parts of water-sduble metal salt shown in the fdowing table 3.

Then, 60 weight parts of fine coal powder with the average partide diameter of 0. 2 um was added to the mixture to prepare a ceramic catalyst material mixture.

[87] The mixture was mixed with distiled water in the 1.5-times weight of the mixture, and then kneaded. Then, the kneaded mixture was shaped as a cylindrical shape having the diameter of 3 cm and the length of 10 cm, and dried for 72 hours at an ordinary room temperature. The dried material was fired in an electric furnace for 12 hours at the temperature of 900 ° C, and then cooled at an ordinary room temperature to prepare a ceramic catalyst.

[88] The obtained cytindrica ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catalyst was inputted to the ex- perimenta device (fig. 2) for disintegrating vapor phase organic compounds.

Sufficient amount of water was inputted into the evaporation plate and the ex- perimenta device was sealed to make a humidity inside a container saturated. Then, 2000 ppm of carbon dioxide (CO) was injected to the experimental device through the 2 septum, and maintained for 72 hours with being heated to the temperature of 120 °C.

The amounts of carbon dioxide CO2 and byproducts inside the experimental device were measured by using a gas chromatography (HP-5890). The result was shown in the fdowing table 3.

[89] [90] [Table 3] Water-sduble metal salt Disintegration ratio (volume%) 120 °C Magnesium acetate (Mg(C2H3O2)2) 3 Strontium acetate (Sr(C2H3O2)2) 4 Barium nitrate (Ba(NO3)2) 3 Vananium sulfate (V2(SO4)3) 5 Chrome nitrate (Cr(NO3)3) 4 Mangan acetate (Mn(C2H3O2)2) 4 Ferric chioride (FeCl3) 3 Nickel sulfate (NiSO@) 4 Copper chbride (CuC1) 4 2 Zinc chloride (ZnCl2) 3 Cadmium acetate (Cd(C2H3O2)2) 4 Tin chbride (SnCl@) 3 2 Bithmuth phosphate (BiPO@) 4 Calcium hydroxide (Ca(OH2) 5 Lithium hydroxide (LiOH) 4 Sodium hydroxide (NaOH) 3 Potassium hydroxide (KOH) 4 Barium hydroxide (Ba (OH)) 3 2 Sodium sulfide (NaS) 3 Sodium sulfate(Na2SO4) Sodium sulfite(Na2SO3) Sodium iodide (NaI) 3 [91] [92] As shown in the above table 3, the porous ceramic catalyst containing a metal oxide of the present invention has a disintegration property for carbon dioxide at a high temperature such as higher than 100 °C.

[93] [94] Example 4: Disintegration property of ceramic catalyst additional coated with a metal oxide [95] [96] A ceramic catalyst prepared according to the process in Example 1 using porous alumina as a ceramic material was immersed into 10 wt% metal salt aqueous sdution for 3 hours, and dried for 24 hours at an ordinary room temperature. The dried metal salt contained catalyst was fired for 1 hour in an electric oven at a temperature of 1000 °C, and then coded to an ordinary room temperature, to fabricate a ceramic catalyst of the present invention.

[97] The obtained cyfindrical ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and 5 g of the ceramic catalyst was inputted to the ex- perimental device (fig. 2) for disintegrating vapor phase organic compounds. After the experimental device was sealed, 1000 ppm of propionic aldehyde (C H CHO) was 2 3 injected to the experimental device through the septum, and maintained for 24 hours at an ordinary room temperature (25 °C to 30°C) and 60 °C respectively. The disin- tegration ratio for the propionic aldehyde inside the experimental device was measured by using a gas chromatography (HP-5890). The result was shown in the fdowing table 4. <BR> <BR> <P>[98]<BR> <BR> <BR> <BR> <BR> <BR> [99] [Table 4] Metal salt aqueous solution Disintegration ratio (vdume%) Ordinary room 60 °C temperature Calcium hydroxide 4 8 Sodium hydroxide 4 7 Potassium hydroxide 3 7 Barium hydroxide 4 7 Lithium hydroxide 5 8 Sodium sulfide (NaS) 4 8 Sodium sulfate (Na SO) 5 10 2 4 Sodium sulfite(Na2SO3) 5 11 Sodium iodide(NaI) 3 6 [100] [101] As shown in the above table 4, a ceramic catalyst of the present invention, which is additional coated with a metal salt aqueous sdution, has an excelent disintegration property for vapor phase organic compounds at a bw temperature, such as 60 °C or even at an ordinary room temperature.

[102] Industrial Applicability [103] [104] As aforementioned, the metal oxide contained porous ceramic catalyst having various pores of the present invention, which is obtained by dispersing a water-sduble metal salt into a ceramic material, or optionaly, by additional coating the ceramic catalyst with a metal salt aqueous sdution, has an remarkably improved disintegration property for vapor phase organic compounds. Especialy, the porous ceramic catalyst can absorb and disintegrate vapor phase organic compounds even at a bw temperature, such as bwer than 100 °C, or even at an ordinary room temperature. Accordingly, the porous catalyst containing a metal oxide of the present invention has a great industrial appicabity to various fields, such as a removal for odorous materials.

[105] As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not fimited by any of the details of the foregoing de- scription, unless otherwise specified, but rather should be construed broady within its spirit and scope as defined in the appended daims, and therefore al changes and modi- fications that fal within the metes and bounds of the daims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended daims.

[106]