公开(公告)号：US20230321632A1

公开(公告)日：2023-10-12

申请号：US18027044

申请日：2021-08-27

申请人： GRIREM ADVANCED MATERIALS CO., LTD. ,  RARE EARTH FUNCTIONAL MATERIALS (XIONG 'AN) INNOVATION CENTER CO., LTD. ,  GRIREM HI-TECH CO., LTD.

发明人： Xiaowei HUANG ,  Yongke HOU ,  Zheng ZHAO ,  Yongqi ZHANG ,  Juanyu YANG ,  Meisheng CUI ,  Zhizhe ZHAI ,  Yang XU ,  Zongyu FENG ,  Shilei CHEN

IPC分类号： B01J21/06 ,  B01J35/10 ,  B01J37/00 ,  B01J37/03 ,  B01J23/10 ,  B01D53/94 ,  B01J37/08

CPC分类号： B01J21/066 ,  B01J35/1014 ,  B01J37/009 ,  B01J37/038 ,  B01J23/10 ,  B01J35/1038 ,  B01J35/1042 ,  B01D53/945 ,  B01J37/08 ,  B01D2255/407 ,  B01D2258/01 ,  B01D2255/908

摘要： The present disclosure relates to a cerium-zirconium-based composite oxide having gradient element distribution and a preparation method therefor. According to the present disclosure, the cerium-zirconium-based composite oxide having gradient element distribution is prepared by a step-by-step precipitation method. First, a zirconium-rich component is precipitated to form a crystal structure and a crystal grain stack structure which have high thermal stability, slow down the segregation of zirconium on a surface after high-temperature treatment, and reduce element migration among crystal grains; second, a cerium-rich component is precipitated to improve the cerium content of the surface layers of the crystal grains, improve the utilization rate of the cerium element, and improve the oxygen storage amount and the oxygen storage rate.