Title:
METHOD FOR SOLVING PROBLEM OF SO2 POISONING OF LOW-TEMPERATURE SCR DENITRATION CATALYST
Document Type and Number:
WIPO Patent Application WO/2019/233035
Kind Code:
A1
Abstract:
Disclosed is a method for solving the problem of SO2 poisoning of a low-temperature SCR denitration catalyst. The method comprises reacting an alkaline gas and a metal sulfate deposited on the surface of the catalyst to displace a metal oxide and recover the activity of the catalyst; and decomposing an ammonium salt deposited on the surface of the catalyst through NO2 or NO and O2 to avoid the catalyst being covered. The method can regenerate a poisoned catalyst off-line, and also can enable the generation and decomposition of a metal sulfate and an ammonium salt on the surface of the catalyst to reach a dynamic equilibrium on-line, thus the active components of the catalyst are neither lost nor covered by an ammonium salt, achieving the purpose of resisting the SO2 poisoning of a low-temperature SCR denitration catalyst. The method can also be used for the regeneration of other catalysts poisoned by SO2, such as a methane catalytic oxidation catalyst poisoned by SO2. When used on-line, the method can also transform some metal oxide dust in the flue gas into effectively active components of a catalyst. The method can effectively extend the service life of a catalyst and reduce the operating cost of an SCR system.
Inventors:
MA ZHAOXIA (CN)
SHENG LIPING (CN)
CHEN SHIYUAN (CN)
YANG HANGSHENG (CN)
WANG YONG (CN)
ZHANG ZE (CN)
SHENG LIPING (CN)
CHEN SHIYUAN (CN)
YANG HANGSHENG (CN)
WANG YONG (CN)
ZHANG ZE (CN)
Application Number:
PCT/CN2018/114662
Publication Date:
December 12, 2019
Filing Date:
November 08, 2018
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
International Classes:
B01J23/92; B01J23/94; B01J23/96; B01J38/08
Foreign References:
| CN108722436A | 2018-11-02 | |||
| CN104190478A | 2014-12-10 | |||
| CN105688936A | 2016-06-22 | |||
| CN102658215A | 2012-09-12 | |||
| CN104226380A | 2014-12-24 | |||
| JP2016007554A | 2016-01-18 | |||
| JPS5551438A | 1980-04-15 |
Attorney, Agent or Firm:
HANGZHOU QIUSHI PATENT OFFICE CO., LTD. (CN)
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