China Automotive Technology and Research Center Co. Ltd

Catarc Automotive Test Center (tianjin) Co., Ltd

Congjie Lv

Kaixiang Li

Zhenguo Li

Cheng Lv

Jianhai Wang

Xiaoning Ren

Yuankai Shao

Lingfeng Jia

An H-type molecular sieve having the CHA framework type is directly prepared through hydrothermal synthesis by using the compounds with the chemical formulas (CHNO)PO and/or (CHNO)PO(CHN) 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, Nselectivity, and structural stability in the NH-SCR technology.

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

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Tianjin, China

Congjie Lv