SCR catalyst and its preparation method and applications

US11110437B2 · kind B2 · utility

Assignees

• BAOTOU RESEARCH INSTITUTE OF RARE EARTHS · CN
• NATIONAL ENGINEERING RESEARCH CENTRE OF RUIKE RARE EARTH METALLURGY AND FUNCTION MATERIALS CO, LTD. · CN
• HEBEI HWAT AUTOMOBILE COMPONENTS CO., LTD. · CN

Inventors

• Wenyi Zhao · Wukehudong, CN
• Yan Wang · Hunan, CN
• Zhaoqiang Li · Wukehudong, CN
• Cheng Zhang · Dalian, CN
• Rongrong Fan · Shanghai, CN
• Xin Guo · Chengdu, CN
• Yu Wang · Hsinchu, TW
• Rong Wang · Nanhu, CN
• Lihua SONG · Shouguang City, CN
• Yanhai Song · Wukehudong, CN
• Yuan Li · Shandong, CN
• Zhiyong Ding · Wukehudong, CN
• Jing Song · Sha Tin, CN

Key dates

• Filing date: Jul 17, 2019
• Grant date: Sep 7, 2021
• Expiry date: Oct 21, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02A50/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for preparing an SCR catalyst may include: (1) placing a first aqueous solution containing a titanium oxide and a tungstate in an electric field environment, adjusting the pH value of the first aqueous solution, and adjusting the current direction of the electric field environment to obtain a first mixture; (2) providing a second mixture by, in the electric field environment, adding dropwise a second aqueous solution containing a soluble salt of one or more active components, a copper-organic polyamine complex and a dispersant to the first mixture, and adjusting the current direction; and (3) processing the second mixture to obtain the SCR catalyst. The one or more active components may be selected from Ce, Zr, Cu, Fe, Pr and Sc.