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Fractal dimension of zirconia nanopowders and their activity in the CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
50894 46820 2011 6 PDF Available
Title
Fractal dimension of zirconia nanopowders and their activity in the CO oxidation
Abstract

We present a study of the CO oxidation on zirconia nanopowders consisted of nanoparticles with a size in a range of 3–7 nm. The fractal characteristics of zirconia nanopowders were studied both by nitrogen adsorption and small-angle X-ray scattering. The surface fractal dimension of zirconia is approximately constant and equals to 2 indicating that zirconia nanoparticles have a smooth surface in all solids. The mass fractal dimension is in the range between 2.1 and 2.5 showing a difference in nanoparticle aggregation depending on their size. Catalytic tests indicate that the activation energy of the CO oxidation on zirconia nanopowders (Ea) is constant. We associate this observation with constancy of the surface fractal dimension. The pre-exponential factor of the rate constant (ko) varies significantly decreasing with increasing the mass fractal dimension of solids. This finding is in a good agreement with theoretical approach developed in this communication.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► The activation energy of the CO oxidation on zirconia nanopowders (Ea) is constant. ► The pre-exponential factor of the rate constant (ko) significantly varies. ► Changes of ko are associated with changes of the mass fractal dimension of catalysts.

Keywords
Zirconia; Fractal dimension; Catalysis; CO oxidation; Rate constant
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Fractal dimension of zirconia nanopowders and their activity in the CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 8, 31 March 2011, Pages 766–771
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
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