High dispersed Pd supported on CeO2 (100) for CO oxidation at low temperature

被引：20

作者：

Zhang, Xia ^{[1
]}

Li, Wenzhi ^{[1
,2
]}

Zhou, Zean ^{[1
]}

Chen, Kun ^{[1
]}

Wu, Mingwei ^{[1
]}

Yuan, Liang ^{[3
]}

机构：

[1] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Lab Basic Res Biomass Convers & Utilizat, Hefei 230026, Peoples R China

[2] Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China

[3] Anhui Univ Sci & Technol, Natl & Local Joint Engn Res Ctr Precis Coal Min, Huainan 232001, Peoples R China

来源：

MOLECULAR CATALYSIS | 2021年 / 508卷

基金：

中国国家自然科学基金;

关键词：

Pd dispersion; CeO2; morphology; Metal-support interaction; CO oxidation; IN-SITU DRIFTS; OXIDE CATALYSTS; CERIA; TRANSITION; INTERFACE; MECHANISM; METHANE; COBALT; HYDROGENATION; PERFORMANCE;

D O I：

10.1016/j.mcat.2021.111580

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：

Nanostructured CeO2 with morphologies of nanorod, nano-cube, and nano-octahedron were successfully synthesized and the effects of cerium morphology were investigated on the catalytic efficiency of Pd/CeO2 for CO combustion. The light-off curves showed that Pd supported on rod-like CeO2 (1 0 0) plane had excellent performance. Subsequently, different contents of Pd were loaded on nanorod CeO2 to investigate the effect of Pd and CeO2 support interaction on the catalytic activity. Under optimal deployment, CO can be completely converted below 50 degrees C. Through cautious analysis of SEM, HAADF-STEM, XRD, XPS, and EDS patterns, Pd was proved to be highly dispersed on the surface of CeO2 carrier (1 0 0) in the form of PdO and PdxCe1-xO2-sigma. As a result of the strong metal-support interaction, Pd2+ ions substituted for Ce4+, -Pd2+-O2- -Ce4+- species were formed for enhancing CO oxidation. Simultaneously, the generation of Ce3+/Ce4+ ion pairs can be regulated by adjusting the proportion of Pd. Further in situ DRIFTS characterization revealed that in this reaction system, highly dispersed Pd on the surface of Pd/R-CeO2 could increase the concentration of Ce3+ on the surface, and lattice oxygen was activated in the oxidation reaction to generate abundant oxygen vacancies, which can promote the generation of active centers synergistically, thereby greatly enhancing the reaction activity.

引用

页数：8

共 53 条

[1] Role of palladium crystallite size on CO oxidation over CeZrO4-δ supported Pd catalysts [J].

Burange, Anand S. ;

Reddy, Kasala Prabhakar ;

Gopinath, Chinnakonda S. ;

Shukla, Rakesh ;

Tyagi, Avesh K. .

MOLECULAR CATALYSIS, 2018, 455 :1-5

[2] The CO oxidation mechanism on small Pd clusters. A theoretical study [J].

Cesar Gonzalez-Torres, Julio ;

Bertin, Virineya ;

Poulain, Enrique ;

Olvera-Neria, Oscar .

JOURNAL OF MOLECULAR MODELING, 2015, 21 (11)

[3] Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer-Tropsch Synthesis [J].

Chen, Wei ;

Filot, Ivo A. W. ;

Pestman, Robert ;

Hensen, Ernie J. M. .

ACS CATALYSIS, 2017, 7 (12) :8061-8071

[4]

Chen Y., APPL CATAL B, V282

[5] Well-defined palladium-ceria interfacial electronic effects trigger CO oxidation [J].

Chen, Yaxin ;

Chen, Junxiao ;

Qu, Weiye ;

George, Christian ;

Aouine, Mimoun ;

Vernoux, Philippe ;

Tang, Xingfu .

CHEMICAL COMMUNICATIONS, 2018, 54 (72) :10140-10143

[6] Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H2-rich stream [J].

Chen, Yena ;

Liu, Dongsheng ;

Yang, Lijuan ;

Meng, Ming ;

Zhang, Jing ;

Zheng, Lirong ;

Chu, Shengqi ;

Hu, Tiandou .

CHEMICAL ENGINEERING JOURNAL, 2013, 234 :88-98

[7] CO oxidation activity enhancement of Ce0.95Cu0.05O2-δ induced by Pd co-substitution [J].

Cwele, Thandanani ;

Mahadevaiah, N. ;

Singh, Sooboo ;

Friedrich, Holger B. ;

Yadav, A. K. ;

Jha, S. N. ;

Bhattacharyya, D. ;

Sahoo, N. K. .

CATALYSIS SCIENCE & TECHNOLOGY, 2016, 6 (22) :8104-8116

[8] Catalysis oxidation of 1,2-dichloroethane and ethyl acetate over ceria nanocrystals with well-defined crystal planes [J].

Dai, Qiguang ;

Huang, Hao ;

Zhu, Yu ;

Deng, Wei ;

Bai, Shuxing ;

Wang, Xingyi ;

Lu, Guanzhong .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2012, 117 :360-368

[9] Superior catalytic activity of a Pd catalyst in methane combustion by fine-tuning the phase of ceria-zirconia support [J].

Ding, Yuanqing ;

Wu, Qingqing ;

Lin, Bo ;

Guo, Yanglong ;

Guo, Yun ;

Wang, Yunsong ;

Wang, Li ;

Zhan, Wangcheng .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2020, 266

[10] Morphology effects on surface chemical properties and lattice defects of Cu/CeO2 catalysts applied for low-temperature CO oxidation [J].

Dong, Fang ;

Meng, Yu ;

Han, Weiliang ;

Zhao, Haijun ;

Tang, Zhicheng .

SCIENTIFIC REPORTS, 2019, 9 (1)

← 1 2 3 4 5 6 →