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Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
42438 45925 2009 9 PDF Available
Title
Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5
Abstract

The catalytic conversion of CH3Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO2/Al2O3 molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO2/Al2O3 ratio are 5 wt% and 70, respectively. The 5 wt% PbO/HZSM-5 calcined at 450 °C for 8 h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO2, Al2O3 or ZrO2 as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH3Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH4 to aromatics.

Graphical abstractThe selective conversion of CH3Br into aromatics was investigated over HZSM-5 modified by various metal oxides, and the 5 wt%PbO/HZSM-5 catalyst calcined at 450 °C for 8 h performs the best, showing aromatic yield up to 31.6%. The deactivation of catalyst is a result of coking. A plausible mechanism for aromatization has been proposed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Bromomethane; Aromatics; HZSM-5; Lead oxide
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Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 367, Issues 1–2, 1 October 2009, Pages 99–107
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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