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A way to realize controllable preparation of active nickel oxide supported nano-Au catalyst for CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39954 45841 2014 6 PDF Available
Title
A way to realize controllable preparation of active nickel oxide supported nano-Au catalyst for CO oxidation
Abstract

•The controllable preparation of active Au/NiOx for CO oxidation was presented.•[Cl−] during the washing of catalyst precusors is an indicator for the activity.•CO total oxidation can be realized below 0 °C if the [Cl−] was >4 but <8 ppm.•The active nano-Au catalyst possesses nano-Au with smaller particle.•The Au–Au coordination number in the active catalyst is 7.66.

It was generally accepted that the total elimination of chlorine is favorable to build active supported nano-gold catalysts if chlorine-containing precursors was used especially for the total oxidation of CO. Here a series of Au/NiOx catalysts were prepared with co-precipitation method by tracing the chlorine concentration in the washing step and tested by the total oxidation of CO. It was revealed that Au/NiOx catalysts prepared from aqueous solutions with 4–8 ppm chlorine can be active catalysts and the temperature for CO total oxidation was <0 °C. The catalytic activity dropped sharply if the chlorine concentration was <4 ppm or >8 ppm. The catalysts were characterized by XRD, XPS, BET, TEM, HAADF-STEM and EXAFS, and the catalyst structures were explored. The different structures of the catalysts should be responsible for the activity variation and it was caused by the washing operation or the presence of different amounts of chlorine. Although active Au/NiOx catalysts can be obtained by tracing chlorine concentration, the role of chlorine in the fabrication of active nano-gold catalyst was still unclear.

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Keywords
Chlorine concentration; CO oxidation; Nano-Au catalyst; Heterogeneous catalyst; Controllable preparation
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A way to realize controllable preparation of active nickel oxide supported nano-Au catalyst for CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 473, 5 March 2014, Pages 7–12
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