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XAFS and HAADF STEM combined characterization for size regulated Ni nanocluster catalyst and its unique size dependence for water gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
39674 45831 2014 5 PDF Available
Title
XAFS and HAADF STEM combined characterization for size regulated Ni nanocluster catalyst and its unique size dependence for water gas shift reaction
Abstract

•Preparation of size controlled Ni nanocluster catalyst on alumina without formation of NiAl2O4.•Population of distorted particles increased with decrease in average particle size.•Volcano-shaped size dependence was observed for the activity of water gas shift reaction.

X-ray absorption fine structure (XAFS) and high angle annular dark field scanning transmission electron microscopy (HAADF STEM) were both applied to a characterization of the size regulated Ni nanocluster catalyst on alumina. XAFS analysis showed that NiAl2O4 was not formed in our colloid derived catalyst. The wide variety of coordination number (CN) for Ni–Ni indicated the achievement of the size regulated Ni nanocluster catalyst preparation. HAADF STEM analysis showed narrow size distribution of Ni nanocluster catalyst even after H2 reduction at 673 K. Distorted particles were observed and the ratio of distorted particles increased with decrease in the cluster size. Water gas shift reaction was carried out to investigate the catalysis. Volcano-shaped size dependence was observed for the activity of supported Ni nanocluster catalyst.

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Keywords
Ni nanocluster catalyst; XAFS; HAADF STEM; Water gas shift reaction
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XAFS and HAADF STEM combined characterization for size regulated Ni nanocluster catalyst and its unique size dependence for water gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 478, 20 May 2014, Pages 66–70
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us