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

被引：18

作者：

Cwele, Thandanani ^{[1
]}

Mahadevaiah, N. ^{[1
]}

Singh, Sooboo ^{[1
]}

Friedrich, Holger B. ^{[1
]}

Yadav, A. K. ^{[2
]}

Jha, S. N. ^{[2
]}

Bhattacharyya, D. ^{[2
]}

Sahoo, N. K. ^{[2
]}

机构：

[1] Univ KwaZulu Natal, Catalysis Res Grp, Sch Chem & Phys, Westville Campus, ZA-4000 Durban, South Africa

[2] Bhabha Atom Res Ctr, Atom & Mol Phys Div, Mumbai 400094, Maharashtra, India

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2016年 / 6卷 / 22期

关键词：

WATER-GAS-SHIFT; SOLID-SOLUTION; PREFERENTIAL OXIDATION; IN-SITU; NANOSTRUCTURED CERIA; CATALYTIC-ACTIVITY; TRANSITION-METAL; NO REDUCTION; HYDROCARBON OXIDATION; SELECTIVE OXIDATION;

D O I：

10.1039/c6cy00981f

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：

A bimetallic, ionic, Ce0.93Pd0.02Cu0.05O2-delta catalyst was synthesized in one step using a urea-assisted solution combustion method. The structural and electronic properties of the catalyst were studied by different techniques together with those of mono-metallic analogues. The catalytic performance of the materials was investigated using CO oxidation as the model exhaust reaction and the nature of the active sites was examined by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). X-ray diffraction (XRD), Raman spectroscopy, XPS, XANES, EXAFS and high resolution transmission electron microscopy (HR-TEM) revealed that the prepared materials are single-phase, solid-solution oxides with a fluorite structure. In situ XRD studies showed that the prepared materials are metastable up to 1100 degrees C. The correlation of the characterization and catalytic results indicates that catalytic performance is influenced by the presence of oxygen vacancies and the existence of synergism between Pd2+, Cu2+ and cerium ions. DRIFTS results revealed that CO interacts with the active centres already at room temperature, forming Cu+ and Pd2+ carbonyls.

引用

页码：8104 / 8116

页数：13

共 60 条

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