	US 12,264,106 B2
	Cerium-zirconium-aluminum-based composite material, cGPF catalyst and preparation method therefor
Dacheng Li, Chengdu (CN); Jinfeng Wang, Chengdu (CN); Li Lan, Chengdu (CN); Hui Ye, Chengdu (CN); Lan Yang, Chengdu (CN); Feng Zhang, Chengdu (CN); Yi Yang, Chengdu (CN); Yongxiang Cheng, Chengdu (CN); Tiantian Luo, Chengdu (CN); Yinhua Dong, Chengdu (CN); Yun Wang, Chengdu (CN); Yun Li, Chengdu (CN); and Qizhang Chen, Chengdu (CN)
Assigned to SINOTECH COMPANY LIMITED, Chengdu (CN)
Appl. No. 17/619,391
Filed by SINOCAT ENVIRONMENTAL TECHNOLOGY CO., LTD., Chengdu (CN)
PCT Filed Jun. 17, 2020, PCT No. PCT/CN2020/096584 § 371(c)(1), (2) Date Dec. 15, 2021, PCT Pub. No. WO2020/253726, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 201910538169.5 (CN), filed on Jun. 20, 2019.
Prior Publication US 2022/0363603 A1, Nov. 17, 2022
Int. Cl. B01J 21/04 (2006.01); B01D 53/86 (2006.01); B01J 21/06 (2006.01); B01J 23/10 (2006.01); B01J 37/02 (2006.01); B01J 37/04 (2006.01); B01J 37/08 (2006.01); C04B 35/119 (2006.01); F01N 3/10 (2006.01)

CPC C04B 35/119 (2013.01) [B01D 53/865 (2013.01); B01D 53/8653 (2013.01); B01J 21/04 (2013.01); B01J 21/066 (2013.01); B01J 23/10 (2013.01); B01J 37/0215 (2013.01); B01J 37/04 (2013.01); B01J 37/08 (2013.01); F01N 3/101 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/3244 (2013.01)]

2 Claims

1. A method of preparing a cerium-zirconium-aluminum-based composite material, which comprises the following steps:

(1) Dissolving pseudo-boehmite in citric acid aqueous solution, adjusting the pH value to 4-10 with ammonia water, filtering and drying after the reaction under stirring is completed to obtain a precipitate; roasting the precipitate at a temperature of 200-400° C. for 0.1-5 h to obtain a pre-treated material; wherein the mass ratio of pseudo-boehmite to citric acid is 5-20:1;

(2) Adding the pre-treated material into a solution of mixed sol, adjusting the pH value to 4-10 with ammonia water after completely dissolution, filtering and drying after the reaction under stirring is completed to obtain a mixture precipitate; wherein the mixed sol is a sol containing cerium ions and zirconium ions;

(3) Roasting the mixture precipitate at 500-600° C. for 1-10 h, and then at 800-1100° C. for 1-10 h to obtain the cerium-zirconium-aluminum composite material.