Title:
MOLECULAR SIEVE SCR CATALYST AND PREPARATION METHOD
Document Type and Number:
WIPO Patent Application WO/2022/262543
Kind Code:
A1
Abstract:
Disclosed are a molecular sieve SCR catalyst and a preparation method. The preparation method comprises the following steps: (1) heating deionized water to 20 to 90°C, adding a soluble copper salt and an additive for dissolution to prepare a copper solution; (2) heating deionized water to 20 to 90°C, adding a soluble yttrium salt for dissolution, adding a molecular sieve having a silicon-to-aluminum ratio of less than or equal to 24 while maintaining the temperature, and stirring; adding the copper solution while maintaining the temperature, and stirring for ion exchange; (3) cooling the solution after the ion exchange in step (2), adding a binder, and stirring, ball milling, and standing to obtain a slurry; and (4) coating the slurry on a carrier, drying, and calcining to obtain a molecular sieve SCR catalyst. In the present invention, a small pore molecular sieve material having a relatively low silicon-to-aluminum ratio is employed, and by means of adding a second active component yttrium, the prepared catalyst displays excellent catalytic activity for NOx at low and high temperatures, and has a broad activity temperature window, a high hydrothermal stability performance and good resistance to hydrocarbons.
Inventors:
FENG XI (CN)
LIU ZHIMIN (CN)
SUN RUI (CN)
WANG YUN (CN)
ZHANG YANHUA (CN)
WANG RUIFANG (CN)
WEI KUAN (CN)
CHEN HAIKUN (CN)
LAI YINENG (CN)
CHEN YAOQIANG (CN)
LI YUN (CN)
CHEN QIZHANG (CN)
LIU ZHIMIN (CN)
SUN RUI (CN)
WANG YUN (CN)
ZHANG YANHUA (CN)
WANG RUIFANG (CN)
WEI KUAN (CN)
CHEN HAIKUN (CN)
LAI YINENG (CN)
CHEN YAOQIANG (CN)
LI YUN (CN)
CHEN QIZHANG (CN)
Application Number:
PCT/CN2022/095100
Publication Date:
December 22, 2022
Filing Date:
May 26, 2022
Export Citation:
Assignee:
SINOCAT ENVIRONMENTAL TECH CO LTD (CN)
International Classes:
B01J29/76; B01D53/56; B01D53/86; B01J37/02; B01J37/08; B01J37/30
Foreign References:
| CN113546678A | 2021-10-26 | |||
| CN113318780A | 2021-08-31 | |||
| CN106984357A | 2017-07-28 | |||
| CN110479359A | 2019-11-22 | |||
| CN111135860A | 2020-05-12 | |||
| CN112156808A | 2021-01-01 | |||
| CN110681412A | 2020-01-14 |
Attorney, Agent or Firm:
SICHUAN LIJIU LAW FIRM (CN)
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