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The effect of support on methane activation over Pt catalysts in the presence of MoO3

Paper ID Volume ID Publish Year Pages File Format Full-Text
44084 46002 2007 6 PDF Available
Title
The effect of support on methane activation over Pt catalysts in the presence of MoO3
Abstract

It is reported the role of different supports (silica, alumina and zirconia) on the non-oxidative conversion of methane, through the isothermal two-step reaction, on Pt-loaded catalysts, with or without the presence of MoO3. The activated chemisorption of methane, followed by reaction of the carbon adspecies with hydrogen was conducted in pulse and continuous modes, in the temperature range of 473–673 K. It was observed by using pulse mode that evolutions of H2, CO and CO2 occurred simultaneously with the pulses of methane without the formation of higher hydrocarbons. The reactivity, regarding the CH4 conversion, with or without MoO3, follows the sequence Pt/Al2O3 ≈ Pt/ZrO2 > Pt/SiO2. Also the hydrogenation of carbon residues produced only methane. The presence of MoO3 had a positive influence concerning the reactivity of carbon residues, on zirconia and especially on alumina supported catalysts. In the flow mode operation, methane chemisorption is followed by the evolution of H2, plus C2, C2, C3=, and C3, depending on the nature of the support. The hydrogenation of carbon residues produced mainly methane, but ethane and propane were also detected specially in the presence of MoO3 which improves the mobility of CHX adspecies, favoring the CC nucleation.

Graphical abstractWe reported the role of different supports (silica, alumina and zirconia) on non-oxidative conversion of methane, through the isothermal two-step reaction, on Pt-loaded catalysts, with or without the presence of MoO3. The activated chemisorption of methane, followed by reaction of the carbon adspecies with hydrogen was conducted in pulse and continuous modes, in the temperature range of 473–673 K.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methane activation; Supported transition metal catalysts; Hydrogenation of surface carbon adspecies
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The effect of support on methane activation over Pt catalysts in the presence of MoO3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 318, 20 February 2007, Pages 207–212
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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