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New insight in the preparation of alumina supported hydrotreatment oxidic precursors: A molecular approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
43913 45995 2007 13 PDF Available
Title
New insight in the preparation of alumina supported hydrotreatment oxidic precursors: A molecular approach
Abstract

The science on the preparation of the hydrodesulfurization oxidic precursors is coming of age, but the chemistry governing their preparation is not yet clearly understood. In this paper, the chemistry of alumina supported oxomolybdate preparation is revisited taking into account the dissolution/precipitation concept recently developed. Classical preparations with the ammonium heptamolybdate and Co nitrate salts will firstly be discussed. Then the use of new starting materials for the preparation of the impregnating solutions will be considered, showing that at high Mo loading the dispersion is strongly dependant on the nature of the starting salts. The use of phosphomolybdate cobalt salts will also be considered. Lastly we will discuss the improvement of the Co promoting effect using molybdocobaltate heteropolyanions as starting materials and complexing agents. This study shows that the maturation step is the determining step for the improvement of preparation of these alumina based oxidic precursor.

Keywords
Hydrotreatment; Catalysis; Heteropolyanions; Complexing agent; Thiophene
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New insight in the preparation of alumina supported hydrotreatment oxidic precursors: A molecular approach
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 322, 16 April 2007, Pages 33–45
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
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