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Acidity and deactivation of Mo2C/HY catalysts used for the hydrogenation and ring opening of naphthalene

Paper ID Volume ID Publish Year Pages File Format Full-Text
43684 45982 2008 11 PDF Available
Title
Acidity and deactivation of Mo2C/HY catalysts used for the hydrogenation and ring opening of naphthalene
Abstract

The selective ring opening (SRO) of naphthalene over a series of Mo2C/HY catalysts with 7–27 wt% Mo2C, is reported. Pulsed adsorption and temperature programmed desorption of n-propyl amine showed that increased Mo2C content of the Mo2C/HY catalysts significantly decreased the amount and strength of the catalyst acid sites, especially the Brönsted acid sites necessary for SRO. Carbon deposition was the main cause of catalyst deactivation and thermogravimetric analysis of the used catalysts indicated that accumulation of carbonaceous species over the surface of the acidic HY support with time-on-stream led to deactivation of the Mo2C/HY catalysts, whereas no significant carbon deposition occurred on the Mo2C. Catalyst activity tests showed a synergistic effect between the Mo2C and the acidic support (HY) that was not readily obtained with a mechanical mixture of the two catalyst components.

Graphical abstractThe relationship between acidity, Mo2C loading and carbon deposition during selective ring opening (SRO) of naphthalene over Mo2C/HY catalysts is reported. Increased Mo2C loading decreased catalyst acidity and carbon deposition on the acidic HY support, whereas no significant carbon deposition occurred on the Mo2C. A synergistic effect between the Mo2C and the acidic support (HY) was observed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ring opening; Hydrogenation; Catalyst; Molybdenum carbide; HY zeolite; Acidity; Carbon deposition; Deactivation
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Acidity and deactivation of Mo2C/HY catalysts used for the hydrogenation and ring opening of naphthalene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 335, Issue 2, 8 February 2008, Pages 230–240
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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