Sinocat Environmental Technology Co., Ltd.

Sinotech Company Limited

Yongxiang Cheng

Yun Li

Yun Wang

Qizhang Chen

Yaoqiang Chen

Yi Dan

Dacheng Li

Hongyi Du

Tiantian Luo

Qin Wang

Yinhua Dong

Haidi Xu

Yanhua Zhang

Ganxue Wu

Lan Yang

Zhifeng Zhang

Guangfa Zu

Yi Yan

Xueqing Zhou

Zan Zhu

Dongdong Wu

Jinfeng Wang

Hui Ye

Li Lan

Feng Zhang

Yi Yang

Dequan Chen

A cerium-zirconium-aluminum-based composite material, a cGPF catalyst and a preparation method thereof are provided. The cerium-zirconium-aluminum-based composite material adopts a stepwise precipitation method, firstly preparing an aluminum-based pre-treated material, then coprecipitating the aluminum-based pre-treated material with zirconium and cerium sol, and finally roasting at high temperature to obtain the cerium-zirconium-aluminum-based composite material. The cerium-zirconium-aluminum-based composite material has better compactness and higher density, and when it is used in cGPF catalyst, it occupies a smaller volume of pores on the catalyst carrier, such that cGPF catalyst has lower back pressure and better ash accumulation resistance, which is beneficial to large-scale application of cGPF catalyst.

Cerium-zirconium-aluminum-based composite material, cGPF catalyst and preparation method therefor

Disclosed in the present invention is an integrated catalyst system for stoichiometric-burn natural gas vehicles, the catalyst system consisting of a three-way catalyst, a molecular sieve catalyst, and a base body, the three-way catalyst and the molecular sieve catalyst being coated on a surface of the base body. In the integrated three-way catalyst and molecular sieve catalyst system of the present invention, at the same time that pollutants such as CO, HC, and NOin the exhaust of stoichiometric-burn natural gas vehicles are processed, the produced byproduct NHcan also be processed, and the conversion rates of CO, HC, NO, and NHare high.

Integrated catalyst system for stoichiometric-burn natural gas vehicles and preparation method therefor

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

The present invention discloses a method for preparing a catalyst, comprising the following steps: (1) taking a noble metal salt solution A, adding a modified alumina support material, stirring until uniform and standing; (2) drying the material obtained in step (1) in a vacuum, and calcining at 500&#xb0; C.-600&#xb0; C. for 1-4 hours to obtain a powder material containing the noble metal; (3) mixing the noble metal powder material, an adhesive and other components to be added, and ball-milling to obtain a uniform slurry; (4) preparing a noble metal solution B and adjusting pH to 0.5-1; and (5) mixing the slurry of the step (3) with the noble metal solution B, coating the mixture on a support, drying, and calcining at 500&#xb0; C.-600&#xb0; C. for 1-2 hours to obtain the target product. The method for preparing the catalyst of the present invention is simple, the conditions of the preparation process are easy to control and the preparation method has strong practicality. The prepared catalyst has a good quality, a low ignition temperature and a high catalytic conversion rate for methane at a relatively low temperature.

Method for preparing noble metal catalyst

Growing community of inventors

Chengdu, China

Yongxiang Cheng