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Permanent link (DOI): https://doi.org/10.7939/R3SH1J

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Arsenic effects on a NiMo/Al2O3 hydrotreating catalyst Open Access

Descriptions

Other title
Subject/Keyword
Trickle-bed
Catalyst
Hydrotreating
Arsenic
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Scholte, Paola
Supervisor and department
McCaffrey, William (Chemical and Materials Engineering)
Examining committee member and department
de Klerk, Arno (Chemical and Materials Engineering)
McCaffrey, William (Chemical and Materials Engineering)
Fleck, Brian (Mechanical Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-01-10T23:20:20Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
Hydrotreating is the response to the necessity of a cleaner feed for downstream processes and reduced pollution. Hydrotreating catalysts are vital in this process; hence catalyst deactivation is a key issue. The principal objective of this research was the experimental study of hydrotreating catalyst deactivation due to arsenic compounds. The hydrotreating of light gas oil, in the presence and absence of an arsenic compound over a commercial NiMoS catalyst, was investigated in a trickle bed reactor (temperature 315-360˚C, space velocity = 1-3 h-1, pressure = 3MPa). Kinetics of first order for nitrogen and sulphur were found and activation energies values of 32 kj/mol and 76 kj/mol respectively. Studies of activity changes, suggested that arsenic mainly affects the conversion of sulfur compounds; which might indicate that arsenic prefers mainly the S edge of the catalysts. Activation energy values decreased after arsenic introduction, which may suggest pore plugging of the catalyst.
Language
English
DOI
doi:10.7939/R3SH1J
Rights
License granted by Paola Scholte (scholte@ualberta.ca) on 2011-01-10T02:38:58Z (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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File title: Chapter I
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