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Insight to sulfur species in the hydrodeoxygenation of aliphatic esters over sulfided NiMo/γ-Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42925 45947 2009 7 PDF Available
Title
Insight to sulfur species in the hydrodeoxygenation of aliphatic esters over sulfided NiMo/γ-Al2O3 catalyst
Abstract

The hydrodeoxygenation (HDO) network of aliphatic esters was investigated over reduced and sulfided NiMo/γ-Al2O3 catalysts in a batch reactor at 250 °C and 7.5 MPa. Methyl and ethyl heptanoate and their main HDO reaction intermediates were used as reactants. The participation of surface OH− and SH− groups in the various reaction steps and the stability of the surface sulfur are discussed. Although the surfaces of the reduced and sulfided catalysts under H2 have identical properties, the reactivity of the oxygen-containing compounds is greater over the sulfided catalyst. This is due to the stronger nucleophilic strength of the SH− groups compared to the OH− groups. Methyl and ethyl heptanoate react via various reaction pathways, of which alkaline hydrolysis is demonstrated to be of special importance. Sulfur-containing intermediates are formed in the HDO reactions with surface SH− groups. Accordingly, sulfur level on the catalyst surface is diminished.

Graphical abstractThe hydrodeoxygenation (HDO) network of aliphatic esters was investigated over reduced and sulfided NiMo/γ-Al2O3 catalysts. The participation of surface OH− and SH− groups in the various reaction steps and the stability of the surface sulfur are discussed. Stronger nucleophilic strength of the SH− groups compared to the OH− groups and formation of sulfur-containing intermediates were of special importance.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrodeoxygenation (HDO); Methyl heptanoate; Sulfided NiMo; Reduced NiMo; Surface sulfur
First Page Preview
Insight to sulfur species in the hydrodeoxygenation of aliphatic esters over sulfided NiMo/γ-Al2O3 catalyst
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 1, 30 April 2009, Pages 42–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis