Sinocat Environmental Technology Co., Ltd.

Yi Dan

Yun Wang

Yun Li

Qizhang Chen

Yongxiang Cheng

Yaoqiang Chen

Haidi Xu

Hongyi Du

Tiantian Luo

Qin Wang

Yanhua Zhang

Yinhua Dong

Zhifeng Zhang

Zan Zhu

Dequan Chen

A low-temperature NOstorage catalyst for automobile exhaust purification and a preparation method thereof. Loading a noble metal salt solution on molecular sieve by equal volume impregnation method, wherein the noble metal salt solution comprises palladium nitrate and platinum nitrate, and the molecular sieve comprises SSZ, SAPO and BETA, then drying at 60-120&#xb0; C. for 2-6 h, roasting at 500-550&#xb0; C. in air for 2-5 h, and further roasting at 750-850&#xb0; C. in air for 2-5 h, and then mixing with aluminum sol, ball milling and pulping, and then coating the slurry on a carrier, wherein the loading on the coating is 100-250 g/L and the noble metal content is 10-150 g/ft, drying at 60-120&#xb0; C. for 2-6 h, then roasting at 500-550&#xb0; C. in air for 2-5 h, and further continuing roasting at 750-850&#xb0; C. in air for 2-5 h, to obtain the catalyst. Loading the noble metals Pt and Pd into a pore channel of a molecular sieve improves NOstorage capacity of a catalyst at low temperatures, and selecting a different type of molecular sieve as an NOstorage unit and increasing a roasting temperature of a molecular sieve material on which Pt and Pd are loaded significantly increases NOstorage capacity.

Low-temperature NOstorage catalyst used for automobile exhaust purification and preparation method thereof

Disclosed in the present invention is a tail gas treatment catalyst. The catalyst consists of a carrier, a first catalyst, and a second catalyst. The first catalyst and the second catalyst are provided on both ends of the carrier. The first catalyst can purify pollutants in tail gas. The second catalyst can purify a byproduct, ammonia, obtained by the purification by the first catalyst and pollutants that are not completely purified by the first catalyst. The second catalyst is of a double-layer structure; the lower layer consists of an oxygen storage material, aluminum oxide, and a second active component; the second active component is a composition of Pt and Pd, or a composition of Ce, Fe, Ni and Cu; the upper layer consists of a molecular sieve and a third active component; the third active component is Cu or a composition of Cu and Fe. The tail gas treatment catalyst of the present invention has high purification treatment efficiency, and can significantly reduce the emissions of CH, CO, and NOin the tail gas, especially reduce the content of the byproduct, NH, so that the tail gas can meet China VI emission standards.

Tail gas treatment catalyst, preparation method therefor and use thereof

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Chengdu, China

Yi Dan