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In situ magnetic resonance imaging study of the impregnation of γ-alumina pellets

Paper ID Volume ID Publish Year Pages File Format Full-Text
39252 45815 2015 6 PDF Available
Title
In situ magnetic resonance imaging study of the impregnation of γ-alumina pellets
Abstract

•SPI enables studying catalyst preparation in the presence of paramagnetic ions.•The transport rate of ions in the pellet depends non-linearly on the concentration.•A minimum Ni2+ concentration is required to quickly reach uniform ion distribution.

In petroleum refining, γ-alumina is used as a solid support of molybdenum nickel/cobalt promoted catalysts for the hydrotreatment processes, such as hydrodesulfurization. The ever decreasing norms for the sulfur content in gasoline require better and more efficient catalysis, prompting extensive research on the materials and the factors influencing the activity, selectivity and stability of the catalytic processes. In the present study, Magnetic Resonance Imaging Single Point Imaging is tested as a tool to monitor the impregnation of γ-alumina pellets with Ni(NO3)2 aqueous solutions at varying Ni2+ concentration. The method enables a study in the presence of paramagnetic elements in the alumina support, in the conditions of very fast T1 and T2. It is shown that at higher concentrations of metal ions a homogenous distribution in the support is attained faster. A non-linear dependence is observed and a minimum ion concentration of 0.2 M is necessary for achieving short impregnation times of alumina pellets of millimeter size scale.

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Keywords
MRI; SPI; γ-Al2O3; Alumina impregnation; Catalyst preparation; Ni2+
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In situ magnetic resonance imaging study of the impregnation of γ-alumina pellets
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 503, 25 August 2015, Pages 111–116
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