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Characterization of Mo2C–WO2 composite catalysts for bifunctional isomerization: A new pulse method to quantify acid sites

Paper ID Volume ID Publish Year Pages File Format Full-Text
43873 45993 2006 9 PDF Available
Title
Characterization of Mo2C–WO2 composite catalysts for bifunctional isomerization: A new pulse method to quantify acid sites
Abstract

New bimetallic catalysts containing molybdenum carbide (Mo2C) and tungsten dioxide (WO2) with three different Mo/W ratios were synthesized by temperature programmed reaction in flow of C2H6/H2 mixture and used for the bifunctional isomerization of n-heptane. They are characterized by X-ray diffraction (XRD), electron diffraction (ED), transmission electron spectroscopy (TEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), N2 sorption, CO chemisorption and adsorption–desorption of iso-propylamine. New pulse method based on the adsorption–desorption of iso-propylamine was used to estimate the total amount of acid sites of which are differentiated the number of Lewis and Brönsted acid sites. XPS shows that only molybdenum and a limited part of tungsten are reduced while the major part of tungsten is under oxide form as WO2. The adsorption of CO allows estimating the number of metallic sites (Mo2C) and coke is formed during the isomerization of n-heptane on Brönsted acid sites (WO2). A kinetic study gives that the reaction order is first for n-heptane conversion. The stabilisation of activity and high selectivity to iso-C7 from 86 to 94% for the isomerization of n-heptane are observed after induction period of 9 h. The turnover rate (TOR) is 0.1 s−1 at 300 °C.

Keywords
Mo2C; WO2; Brönsted acid sites quantification; Bifunctional isomerization of n-heptane; TOR
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Characterization of Mo2C–WO2 composite catalysts for bifunctional isomerization: A new pulse method to quantify acid sites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 302, Issue 1, 21 March 2006, Pages 5–13
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