公开(公告)号：US20230321631A1

公开(公告)日：2023-10-12

申请号：US18027041

申请日：2021-08-27

申请人： Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd. ,  GRIREM ADVANCED MATERIALS CO., LTD ,  GRIREM HI-TECH CO., LTD.

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

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

CPC分类号： B01J21/066 ,  B01J23/10 ,  B01J37/038 ,  B01J37/009 ,  B01J37/08

摘要： The present disclosure provides a cerium-zirconium-based composite oxide with a core-shell structure and a preparation method thereof, a catalyst system using the cerium-zirconium-based composite oxide, a catalytic converter for purifying tail gas by using the catalyst system, and application of the catalyst system or the catalytic converter in motor vehicle exhaust purification, industrial waste gas treatment or catalytic combustion. In the present invention, the cerium-zirconium-based composite oxide with a core-shell structure oxygen storage material is prepared by a step-by-step precipitation method. On the one hand, yttrium and a part of zirconium and cerium are precipitated on a cerium-zirconium surface, where the post-precipitation of yttrium is to segregate yttrium ions (Y3+) on a grain boundary surface, thus reducing lattice surface energy, pinning the grain boundary surface, making the migration of the grain boundary surface difficult, controlling the growth of grains.

公开(公告)号：US20240359164A1

公开(公告)日：2024-10-31

申请号：US18770265

申请日：2024-07-11

申请人： GRIREM HI-TECH CO., LTD. ,  Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd. ,  GRIREM ADVANCED MATERIALS CO., LTD.

发明人： Zheng ZHAO ,  Xiaowei HUANG ,  Yongqi ZHANG ,  Yongke HOU ,  Zongyu FENG ,  Weixin ZHAO ,  Yang XU

IPC分类号： B01J23/656 ,  B01J35/57 ,  B01J37/02 ,  B01J37/08 ,  B01J37/12

CPC分类号： B01J23/6562 ,  B01J35/57 ,  B01J37/0215 ,  B01J37/08 ,  B01J37/12

摘要： Disclosed are a grain boundary and surface-loaded noble metal catalyst, a preparation method and an application thereof. The noble metal is dispersed at the grain boundary and surface of alumina and/or a rare earth manganese-zirconium composite oxide to form a multiphase interface, which achieves the following beneficial technical effects: firstly, the multiphase interface has a larger steric hindrance and a stronger anchoring effect, which can inhibit the migration, agglomeration, and growth of the noble metal at high temperatures, increase the high-temperature stability and catalytic performance of the noble metal, and reduce the usage of the noble metal; secondly, the multiphase interface exhibits a synergistic catalytic effect, which can reduce the activation energy of lattice oxygen and increase the quantity of active oxygen, thereby enhancing the NO oxidation and low-temperature catalytic activity.

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.