Conversion of CO2 on a highly active and stable Cu/FeOx/CeO2 catalyst: tuning catalytic performance by oxide-oxide interactions

被引：36

作者：

Lin, Lili ^{[1
]}

Yao, Siyu ^{[1
]}

Rui, Ning ^{[1
]}

Han, Lili ^{[2
]}

Zhang, Feng ^{[3
]}

Gerlak, Clifford A. ^{[1
]}

Liu, Zongyuan ^{[1
]}

Cen, Jiajie ^{[3
]}

Song, Liang ^{[3
]}

Senanayake, Sanjaya D. ^{[1
]}

Xin, Huolin L. ^{[2
]}

Chen, Jingguang G. ^{[1
]}

Rodriguez, Jose A. ^{[1
,3
,4
]}

机构：

[1] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[2] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[3] SUNY Stony Brook, Dept Mat Sci & Chem Engn, Stony Brook, NY 11794 USA

[4] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 14期

关键词：

RAY-ABSORPTION SPECTROSCOPY; IN-SITU CHARACTERIZATION; GAS-SHIFT REACTION; CERIA; HYDROGENATION; DEHYDROGENATION; DEACTIVATION; REDUCTION; OXIDATION; SUPPORT;

D O I：

10.1039/c9cy00722a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanoparticles of FeOx dispersed on ceria exhibit unique chemical and textural properties. They undergo a dynamic FeOx <-> Fe transformation depending on the reaction conditions. The high density Fe oxide clusters dispersed over CeO2 are effective texture promoters that enhance the stability of Cu/CeO2 catalyst in the high temperature reverse water gas shift reaction. At the optimal Fe loading, the deactivation rate constant of a 5Cu1.6Fe/CeO2 catalyst is only 0.003 h(-1), five times smaller than that of the monometallic 5Cu/CeO2 catalyst. In situ XRD, AP-XPS and XAFS characterizations reveal that the partially reduced Fe nanoparticles would be oxidized by CO2 in the reductive atmosphere and re-disperse into high density FeOx clusters under the high temperature CO2 hydrogenation process. The wetting phenomenon, maximizing the density of FeOx particles on the CeO2 support, benefits from strong oxide-oxide (Fe-O-Ce) interactions.

引用

页码：3735 / 3742

页数：8

共 39 条

[1] Low-Temperature Restructuring of CeO2-Supported Ru Nanoparticles Determines Selectivity in CO2 Catalytic Reduction [J].