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Sol–gel method for synthesis of Mn–Na2WO4/SiO2 catalyst for methane oxidative coupling

Paper ID Volume ID Publish Year Pages File Format Full-Text
54063 46995 2014 11 PDF Available
Title
Sol–gel method for synthesis of Mn–Na2WO4/SiO2 catalyst for methane oxidative coupling
Abstract

•A novel sol–gel method was developed for preparing the Mn–Na2WO4/SiO2 catalyst for OCM application.•The best OCM performance was achieved under very desired low methane-to-oxygen ratio and low nitrogen dilution.•The sol–gel made catalyst provides 5–15% higher C2-selectivity than the wetness impregnated catalyst.•The proposed preparation method can be efficiently exploited for activating a ceramic membrane.

In this experimental study, a novel sol–gel method was developed to synthesize a 1.9%Mn–5%Na2WO4/SiO2 catalyst for oxidative coupling of methane (OCM) reactions. The performance of the synthesized catalyst was investigated in fixed-bed and porous packed-bed membrane reactors. Particularly, the effects of operating temperature, methane-to-oxygen ratio and nitrogen dilution on the performance of this catalyst were investigated. It was observed that for high values of methane conversion, the sol–gel Mn–Na2WO4/SiO2 catalyst provides 5–15% higher selectivity toward the desired products (C2: C2H4 + C2H6) than the Mn–Na2WO4/SiO2 catalyst prepared by the incipient wetness impregnation method. It was also observed that for a similar set of experiments, the C2-selectivity of the sol–gel catalyst is affected relatively less by the variation of methane-to-oxygen ratio. As a result, this catalyst can be exploited under the low methane-to-oxygen feed ratio which provides an efficient performance in both the OCM reactor and the OCM process scale. The best observed performance of the sol–gel catalyst in the packed-bed membrane reactor is 78% C2-selectivity, 64% ethylene-selectivity and 24.2% C2-yield under 20% nitrogen dilution.

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Keywords
Sol–gel method; Catalyst preparation; Oxidative coupling of methane; Mn–Na2WO4/SiO2 catalyst; Packed bed membrane reactor
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Sol–gel method for synthesis of Mn–Na2WO4/SiO2 catalyst for methane oxidative coupling
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 236, Part A, 1 November 2014, Pages 12–22
Authors
, , , , , , , ,
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