Performance of H-ZSM-5-supported bimetallic catalysts for the combustion of polluting volatile organic compounds in air

✍ Scribed by Ahmad Zuhairi Abdullah; Mohamad Zailani Abu Bakar; Subhash Bhatia

• Publisher: Wiley (John Wiley & Sons)
• Year: 2005
• Tongue: English
• Weight: 427 KB
• Volume: 80
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.1278

✦ Synopsis

Abstract

The performance of H‐ZSM‐5‐supported bimetallic catalysts with chromium as the base metal in the combustion of ethyl acetate and benzene is reported. A reactor operated from 100 to 500 °C at a gas hourly space velocity (GHSV) of 32 000 h^−1^ was used for study of the activity. A combination of 1.0 wt% chromium and 0.5 wt% copper yielded a catalyst (Cr~1.0~Cu~0.5~/Z) with improved conversion and carbon dioxide yield. Cr~2~O~3~ (Cr^3+^) and CuO (Cu^2+^) were the predominant metal species in the catalyst. In agreement with the Mars–van Krevelen model, improved reducibility of Cr^3+^ in the presence of Cu^2+^ led to an improvement in activity. The copper content in Cr~1.0~Cu~0.5~/Z also favored the formation of deep combustion products. Condensation and subsequent growth of coke precursors in the catalyst pores led to the formation of a softer and less aromatic coke fraction while dehydrogenation activity on acid sites formed a harder and more aromatic coke fraction. The use of Cr~1.0~Cu~0.5~/Z favored the formation of lower molecular weight intermediates, leading to reduction in formation of softer coke. Copyright © 2005 Society of Chemical Industry