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In situ XAS study on the mechanism of reactive adsorption desulfurization of oil product over Ni/ZnO

Paper ID Volume ID Publish Year Pages File Format Full-Text
47041 46457 2011 13 PDF Available
Title
In situ XAS study on the mechanism of reactive adsorption desulfurization of oil product over Ni/ZnO
Abstract

Reactive adsorption desulfurization (RADS) of a model oil n-nonane containing dibenzothiophene (DBT) was conducted over a Ni/ZnO adsorbent; the evolution of Ni/ZnO adsorbent structure during desulfurization was monitored by in situ X-ray absorption spectroscopy (XAS). The reaction mechanism under different atmospheres and the role of hydrogen in the desulfurization were investigated. The results indicated that the desulfurization processes under nitrogen and hydrogen are different in the reaction mechanism. In nitrogen, the desulfurization over Ni/ZnO is achieved through physical and chemical adsorption; a severe decrease in the desulfurization activity of Ni/ZnO is observed with the time on stream and the desulfurization capacity is very low. In hydrogen, the desulfurization turns to be a reactive adsorption process and Ni/ZnO exhibits a high desulfurization activity and capacity. Hydrogen plays an important role in the RADS; it facilitates the decomposition of DBT on active Ni species, the formation of Ni3S2, and thereafter the transfer of sulfur to ZnO. Metallic Ni as the active nickel species is preserved until most of ZnO is converted to ZnS. On the basis of these observations, a possible sulfur transfer mechanism for the RADS is then proposed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► In situ XAS was used to study the desulfurization of model oil containing dibenzothiophene (DBT) over Ni/ZnO. ► In nitrogen, the desulfurization over Ni/ZnO is achieved through physical and chemical adsorption. ► In hydrogen, the desulfurization turns to be a reactive adsorption process. ► Hydrogen facilitates the decomposition of DBT on active Ni species, the formation of NiSx, and thereafter the transfer of sulfur to ZnO. ► Metallic Ni as the active nickel species is preserved until most of ZnO is converted to ZnS.

Keywords
In situ XAS; Ni/ZnO; Reactive adsorption desulfurization; Dibenzothiophene; Sulfur transfer
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In situ XAS study on the mechanism of reactive adsorption desulfurization of oil product over Ni/ZnO
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 1–2, 21 July 2011, Pages 26–38
Authors
, , , , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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