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Crystalline structure refinements and properties of Ni/TiO2 and Ni/TiO2-Ce catalysts and application to catalytic reaction of “CO + NO”

Paper ID Volume ID Publish Year Pages File Format Full-Text
39669 45831 2014 9 PDF Available
Title
Crystalline structure refinements and properties of Ni/TiO2 and Ni/TiO2-Ce catalysts and application to catalytic reaction of “CO + NO”
Abstract

•Cerium doping affects the crystallography of anatase.•Ni crystallites size decreases with Ce doping.•The insertion of Ce into the lattice of anatase creates Tiα sites.•Incorporation of Ce improves the catalytic performance for “CO + NO” reaction.

Catalysts containing 7 wt% Ni were prepared by impregnation of anatase-phase TiO2 and Ce-doped TiO2 that were synthesized by sol–gel techniques. The catalysts were extensively characterized by a variety of methods including BET surface area measurements, temperature programmed H2 reduction (H2-TPR), scanning transmission electron microscopy (STEM), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) for CO adsorption. The crystallography, crystallite size, microstrain in the crystalline structure and concentration of all phases in the catalysts were determined by X-ray diffraction and refinement of the crystalline structure with the Rietveld method. As catalytic probe reaction, the stoichiometric oxidation of CO by NO was used. Doping with ceria affected the crystallography of the anatase-phase titania, increased the structural defects, and decreased the anatase crystallite size. This, in turn, led to more extensive contact of nickel particles with the support facilitating the reduction of nickel and of the surface of the Ce-doped TiO2. Among the various catalysts investigated, the Ce-doped Ni/TiO2 catalyst with a Ce/(Ce + Ti) ratio of 0.1 was found to be the most active for CO oxidation by NO.

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Keywords
Anatase; Nickel; Ceria; Rietveld refinement; Structural defects; CO + NO reaction
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Crystalline structure refinements and properties of Ni/TiO2 and Ni/TiO2-Ce catalysts and application to catalytic reaction of “CO + NO”
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 478, 20 May 2014, Pages 21–29
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