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Nano-structural changes of SnO2-supported palladium catalysts by redox treatments

Paper ID Volume ID Publish Year Pages File Format Full-Text
42180 45913 2010 7 PDF Available
Title
Nano-structural changes of SnO2-supported palladium catalysts by redox treatments
Abstract

The structural changes in Pd/SnO2 catalyst upon redox treatments were studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). In the as-calcined catalyst, the fine particles of palladium species with the amorphous and the well-cyrstallized states were highly dispersed on the surface of SnO2 support due to the strong chemical interaction. The heat-treatment at 200 °C in hydrogen induced the reduction of palladium species and the particle growth, resulting in the formation of the well-crystallized Pd particles. Some peculiar structures, called the core-shell structure and the particle intrusion structure, were formed by the reduction at 400 °C. After the reoxidation treatment, the core-shell structure disappeared while the particle intrusion structure remained. Furthermore, the decrease in the mean particle diameter was confirmed in the reoxidized catalyst. The proposed formation mechanism of the unique structures from TEM observation was supported by the combination of XRD and XPS measurements.

Graphical abstractThe nano-structures of Pd/SnO2 catalysts treated under several conditions were carefully investigated. The core-shell and the particle intrusion structures were formed by the reduction in 10% H2/N2 at 400 °C. After the reoxidation treatment, the core-shell structure disappeared while the particle intrusion structure remained. Furthermore, the decrease in the mean particle diameter was confirmed in the reoxidized catalyst.Figure optionsDownload full-size imageDownload high-quality image (59 K)Download as PowerPoint slide

Keywords
Palladium; Tin oxide; Catalyst; Structural change; Chemical interaction; TEM
First Page Preview
Nano-structural changes of SnO2-supported palladium catalysts by redox treatments
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 148–154
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis