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Study on methanethiol synthesis from H2S and dimethyl sulfide over Al2O3 catalysts promoted with phosphorus

Paper ID Volume ID Publish Year Pages File Format Full-Text
40804 45866 2012 6 PDF Available
Title
Study on methanethiol synthesis from H2S and dimethyl sulfide over Al2O3 catalysts promoted with phosphorus
Abstract

A series of P-promoted alumina catalysts with phosphorous contents varying in the range of 1–5% for the reaction of hydrogen sulfide (H2S) and dimethyl sulfide (DMS) to produce methanethiol (MT) were prepared and characterized by using XRD, SEM, BET, FT-IR and NMR techniques. The activity assay results showed that at the reaction temperature of 593 K, the P-promoted alumina catalyst exhibits as high as 100% selectivity toward MT; the DMS conversion ranges from 44.7% to 51.4% depending on the loading of phosphorus. The characterization results showed that introducing a small amount of phosphorus into γ-Al2O3 increases the specific surface area, pore volume and the amount of Lewis acid sites. The increase of the Lewis acid sites enhances the capacity of the catalyst to break the CS bond of dimethyl sulfide to methylthiolate (CH3S−) and CH3+, and H2S adsorbed on alumina to SH− and H+, both of CH3+ and H+ then interact further with lattice oxygen O2− of the catalyst to form methoxyl (CH3O−) and OH−, respectively, subsequent combination of CH3S− with OH− or CH3O− with SH− leads to the formation of methanethiol.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (92 K)Download as PowerPoint slideHighlights► The DMS was used as a feed to synthesize MT, an important chemical intermediate. ► Phosphorus-modified alumina was applied to the synthesis of MT from H2S and DMS. ► Phosphorus-modified alumina has a longer life time at 773 K than pure alumina. ► The O2 was added in H2S feed to inhibit the deactivation at high temperature.

Keywords
Phosphorus-promoted alumina; Hydrogen sulfide; Dimethyl sulfide; Methanethiol
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Study on methanethiol synthesis from H2S and dimethyl sulfide over Al2O3 catalysts promoted with phosphorus
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 431–432, 26 July 2012, Pages 151–156
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