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Effect of Pt addition on the isomerization properties of MoO2 − x(OH)y deposited on TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
51988 46861 2011 5 PDF Available
Title
Effect of Pt addition on the isomerization properties of MoO2 − x(OH)y deposited on TiO2
Abstract

Isomerization of n-hexane and n-pentane were studied using equivalent 5 monolayers of MoO3 deposited on TiO2. Addition of 2.5% Pt by weight of MoO3 on the Mo catalyst resulted in an increase in the catalytic activity of the system in favor of hydrocracking products. Surface characterization by XPS-UPS and ISS reveal that the sample surface contains Oxygen, Molybdenum, Platinum and Titanium. Apparently, the metallic properties of the deposited Pt favors the hydrocracking reactions and becomes dominant at reaction temperatures higher than 623 K. Balanced metal-acid functions in MoO2 − x(OH)y phase seems to be in optimized condition toward the hydroisomerization process. The contribution of Platinum addition to this catalytic reaction is not obvious. Combination of surface XPS-UPS, ISS and catalytic reactions carried out at similar experimental conditions enabled us to have better insight concerning the catalytic activities of the different chemical species present on the sample surface.

Graphical abstractIsomerization of n-hexane and n-pentane were studied using equivalent 5 monolayers of MoO3 deposited on TiO2. Addition of 2.5% Pt by weight of MoO3 on the Mo catalyst resulted in an increase in the catalytic activity of the system in favor of hydrocracking products. Surface characterization by XPS-UPS and ISS reveal that the sample surface contains Oxygen, Molybdenum, Platinum and Titanium.Ion scattering spectra (ISS) of 2.5% Pt on MoO3/TiO2 catalyst (a) before hydrogen reduction (b) after reduction at 673 K for 2 h.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Hydroisomerization of n-hexane and n-pentane using Mo based catalysts. ► Addition of Pt improved activity for hydrocracking reactions. ► Characterization of the catalysts by surface XPS-UPS and ISS techniques.

Keywords
MoO3, Pt; TiO2; MoO2 − x(OH)y; Bifunctional catalysis; Isomerization of n-hexane, n-pentane
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Effect of Pt addition on the isomerization properties of MoO2 − x(OH)y deposited on TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 13, 26 July 2011, Pages 1188–1192
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
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Full-text PDF Download
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