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Vapor phase oxidation of dimethyl sulfide with ozone over ion-exchanged zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
41764 45899 2011 6 PDF Available
Title
Vapor phase oxidation of dimethyl sulfide with ozone over ion-exchanged zeolites
Abstract

This work studied the catalyst activity and stability of ion-exchanged zeolites during the oxidation of dimethyl sulfide (DMS) in the presence of ozone. Ozone was used as an oxidant to assess the oxidation capability of Ag/ZSM-5, Mn/ZSM-5 and Ag-Mn/ZSM-5 of DMS at both room temperature and 130 °C. Ion-exchange with silver ions (Ag+) strengthened the adsorption of DMS, resulting in an increased oxidation capacity for DMS. Furthermore, the introduction of manganese ions (Mn2+) strengthened the oxidation capability of DMS, thus enhancing the selectivity of SO2 obtained from the oxidation and reducing the degradation of activity because the pores of the catalyst were blocked by the oxidation products, such as dimethyl sulfoxide (DMSO) and dimethyl sulfone (DMSO2). Ag-Mn/ZSM-5 demonstrated a 100% conversion of DMS; not only SO2 but also H2SO3 and H2SO4 were detected at a high GHSV (90,000 h−1) and low reaction temperature (130 °C). The SO2 adsorption curve and temperature-programmed desorption (TPD) showed that the single metal ion-exchanged zeolite had a weak adsorption capability for SO2 at room temperature, whereas the bi-metal ion-exchanged zeolite had an excellent adsorption capability towards SO2; it could convert SO2 into H2SO3 and could convert oxidized SO2 into H2SO4 in gas phase at room temperature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (79 K)Download as PowerPoint slideResearch highlights▶ Ag-Mn/ZSM-5 oxidizes DMS in the presence of ozone. ▶ The Mn2+ in Ag-Mn/ZSM-5 enhances the oxidizing activity of the catalyst for DMS. ▶ The two metals contained in Ag-Mn/ZSM-5 are cooperative in the oxidization of SO2. ▶ Ag-Mn/ZSM-5 converts SO2 into H2SO3 and oxidizes SO2 to H2SO4 in gas phase.

Keywords
Dimethyl sulfide; Ion-exchanged zeolite; Desulfurization; Oxidation; Adsorption
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Vapor phase oxidation of dimethyl sulfide with ozone over ion-exchanged zeolites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 393, Issues 1–2, 15 February 2011, Pages 251–256
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