Synthesis method for directly preparing H-type molecular sieve having CHA framework type and use thereof

US12330953B2 · kind B2 · utility

Assignees

• CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER CO., LTD · CN
• CATARC AUTOMOTIVE TEST CENTER (TIANJIN) CO., LTD · CN

Inventors

• Kaixiang LI · Tianjin, CN
• Zhenguo Li · Hong Kong, CN
• Xiaoning REN · Tianjin, CN
• Congjie Lv · Tianjin, CN
• Jianhai Wang · Tianjin, CN
• Lingfeng Jia · Tianjin, CN
• Yuankai SHAO · Tianjin, CN
• Cheng LV · Tianjin, CN

Key dates

• Filing date: Jun 20, 2023
• Grant date: Jun 17, 2025
• Expiry date: Mar 28, 2044

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/72
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An H-type molecular sieve having the CHA framework type is directly prepared through hydrothermal synthesis by using the compounds with the chemical formulas (C4H8NO)3PO and/or (C4H8NO)2PO(C4H10N) as structure-directing agents. The structure-directing agent has a molecular topological structure, which is conducive to quickly and efficiently building a molecular sieve having the CHA framework type, so that the prepared product has a regular morphology and high relative crystallinity. The synthesis method can directly synthesize the H-type molecular sieve having the CHA framework type with a relative crystallinity greater than 95%. The molecular sieve product can be obtained by direct drying and calcination without an ammonium exchange process, so the synthesis method is simple, easy to perform, and suitable for large-scale production. The samarium-based CHA molecular sieve catalyst shows excellent ammonia adsorption capacity, low-temperature activity, active temperature window, N2 selectivity, and structural stability in the NH3-SCR technology.