Title:
SYNTHESIS METHOD FOR DIRECTLY PREPARING H-TYPE CHA STRUCTURE MOLECULAR SIEVE AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/025069
Kind Code:
A1
Abstract:
The present invention provides a synthesis method for directly preparing an H-type CHA structure molecular sieve and the use thereof. A compound with a chemical formula of (C4H8NO)3PO and/or (C4H8NO)2PO(C4H10N) is used as a structure-directing agent, and an H-type CHA structure molecular sieve is directly prepared by means of a hydrothermal synthesis method. The structure-directing agent in the present invention has a molecular topological structure, which contributes to rapidly and efficiently constructing a CHA molecular sieve skeleton structure. The prepared product has a regular morphology and a high relative crystallinity. The H-type CHA structure molecular sieve can be directly synthesized by means of the synthesis method, and has a relative crystallinity of larger than 95%. The molecular sieve product can be obtained by means of direct drying and roasting without needing an ammonium exchange step. The method is simple, easy to implement, and suitable for large-scale production. A samarium-based CHA molecular sieve catalyst shows a good ammonia gas adsorption capacity, a low-temperature activity, an active temperature window, N2 selectivity, and structural stability in NH3-SCR technology by virtue of the intrinsic activity of Sm and physicochemical properties of the H-type CHA structure molecular sieve. Under the action of the catalyst, a nitrogen oxide reacts with a reducing agent to convert same into harmless nitrogen and water.
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Inventors:
LI KAIXIANG (CN)
LI ZHENGUO (CN)
REN XIAONING (CN)
LV CONGJIE (CN)
WANG JIANHAI (CN)
JIA LINGFENG (CN)
SHAO YUANKAI (CN)
LV CHENG (CN)
LI ZHENGUO (CN)
REN XIAONING (CN)
LV CONGJIE (CN)
WANG JIANHAI (CN)
JIA LINGFENG (CN)
SHAO YUANKAI (CN)
LV CHENG (CN)
Application Number:
PCT/CN2022/113796
Publication Date:
March 02, 2023
Filing Date:
August 21, 2022
Export Citation:
Assignee:
CATARC AUTOMOTIVE TEST CENTER TIANJIN CO LTD (CN)
CHINA AUTOMOTIVE TECH & RES CT (CN)
CHINA AUTOMOTIVE TECH & RES CT (CN)
International Classes:
C07F9/6533; B01D53/56; B01D53/86; B01J29/70; B01J29/78; B01J29/85; C01B39/04
Foreign References:
| CN113429438A | 2021-09-24 | |||
| US4638076A | 1987-01-20 | |||
| CN104475152A | 2015-04-01 | |||
| CN110407231A | 2019-11-05 | |||
| CN104437608A | 2015-03-25 | |||
| CN108786911A | 2018-11-13 | |||
| US4544538A | 1985-10-01 | |||
| CN108002403A | 2018-05-08 |
Other References:
ZHAO ZHENCHAO, YU RUI, SHI CHUAN, GIES HERMANN, XIAO FENG-SHOU, DE VOS DIRK, YOKOI TOSHIYUKI, BAO XINHE, KOLB UTE, MCGUIRE ROBERT,: "Rare-earth ion exchanged Cu-SSZ-13 zeolite from organotemplate-free synthesis with enhanced hydrothermal stability in NH 3 -SCR of NO x", CATALYSIS SCIENCE & TECHNOLOGY, ROYAL SOCIETY OF CHEMISTRY, UK, vol. 9, no. 1, 2 January 2019 (2019-01-02), UK , pages 241 - 251, XP055882445, ISSN: 2044-4753, DOI: 10.1039/C8CY02033G
LIN YUJUE, ZHIQINGWANG YANGDONGHE, WENJUNWANG CHUANMINGYANG, WEIMIN: "Progresses in the Application of Structure Directing Agents to Zeolite Synthesis", PETROCHEMICAL TECHNOLOGY, SINOPEC - CHINA PETRO-CHEMICAL CORPORATION, CN, vol. 45, no. 2, 1 January 2016 (2016-01-01), CN , pages 227 - 236, XP093040615, ISSN: 1000-8144, DOI: 10.3969/j.issn.1000-8144.2016.02.018
LIN YUJUE, ZHIQINGWANG YANGDONGHE, WENJUNWANG CHUANMINGYANG, WEIMIN: "Progresses in the Application of Structure Directing Agents to Zeolite Synthesis", PETROCHEMICAL TECHNOLOGY, SINOPEC - CHINA PETRO-CHEMICAL CORPORATION, CN, vol. 45, no. 2, 1 January 2016 (2016-01-01), CN , pages 227 - 236, XP093040615, ISSN: 1000-8144, DOI: 10.3969/j.issn.1000-8144.2016.02.018
Attorney, Agent or Firm:
TIANJIN QIXING ZHICAI INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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