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Highly active, selective and stable Mo/Ru-HZSM-5 catalysts for oxygen-free methane aromatization

Paper ID Volume ID Publish Year Pages File Format Full-Text
44281 46013 2006 6 PDF Available
Title
Highly active, selective and stable Mo/Ru-HZSM-5 catalysts for oxygen-free methane aromatization
Abstract

Highly active, selective and stable catalysts for oxygen-free methane aromatization were prepared by using ion-exchange and vapor deposition techniques rather than the conventional metal impregnation methods. Ruthenium (0.15 wt%) was incorporated first to ZSM-5 as a promoter by ion-exchange at room temperature. Then 1–3 wt% of Mo was loaded using Mo(CO)6 as a Mo precursor. High benzene yields of 4.0–4.2% using a 1.5–2 wt% Mo catalyst were achieved at 600 °C with methane flow rate of 270 cm3/g h and 1 atm pressure. Effect of changes in the pretreatment conditions (carburization time) was also investigated. Slower heating rates decreased the induction time and improved benzene yield. Mo loading beyond 2.5 wt% led to lower methane conversions. Temperature-programmed oxidation technique was used to characterize the nature of coke formed on spent catalysts. The amount of coke formed was negligible, resulting in high catalyst performance.

Keywords
Methane aromatization; ZSM-5 zeolite; Mo/Ru-HZSM-5; Molybdenum hexacarbonyl; TPO characterization
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Highly active, selective and stable Mo/Ru-HZSM-5 catalysts for oxygen-free methane aromatization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 297, Issue 2, 6 January 2006, Pages 159–164
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