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Permanent link (DOI): https://doi.org/10.7939/R3193D

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Shape-controlled palladium nanoparticles in catalytic hydrogenations Open Access

Descriptions

Other title
Subject/Keyword
hydrogenations
catalyst
nanoparticles
cube
CTAB
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Ma, Ran
Supervisor and department
Semagina, Natalia (Chemical and Material Engineering)
Examining committee member and department
Bergens, Steven (Chemistry)
Hayes, Robert (Chemical and Material Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2010-12-23T18:26:50Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
Monodisperse Pd nanocubes of 20 nm rib length and Pd nanospheres of 3 nm diameter deposited on corundum were used as efficient tool to reveal structure sensitivity of three-phase hydrogenations of unsaturated alcohols. For an olefin alcohol hydrogenation in the kinetic regime, surface (100) atoms of the cubes displayed lower activity than other surface atoms of the spheres. Apparent activation energies of 23 kJ/mol for the cubes and 17 kJ/mol for the spheres confirmed the reaction structure sensitivity. In an acetylenic alcohol hydrogenation, the cubes showed higher selectivity to an olefinic product than the spheres. Apparent activation energy was found as 38 kJ/mol for the cubes and 24 kJ/mol for the spheres. The apparent structure sensitivity in this case was attributed to liquid-solid mass transfer limitations governing the sphere-catalyzed reactions. The study shows the applicability and limitations of the use of nanoparticles for structure sensitivity studies in catalysis.
Language
English
DOI
doi:10.7939/R3193D
Rights
License granted by Ran Ma (ranm@ualberta.ca) on 2010-12-23T04:45:49Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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