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Ethanol adsorption and oxidation on bimetallic catalysts containing platinum and base metal oxide supported on MCM-41

Paper ID Volume ID Publish Year Pages File Format Full-Text
46424 46439 2012 11 PDF Available
Title
Ethanol adsorption and oxidation on bimetallic catalysts containing platinum and base metal oxide supported on MCM-41
Abstract

Ethanol pollutant either emitted from ethanol-fueled vehicles at low temperature or released from industries as volatile organic compound (VOC) could be removed by catalytic oxidation. This work investigated adsorption of ethanol on bimetallic catalysts containing Pt with loading of 0.5 wt% and Co, Cu, or Mn with loading of 15 wt% supported on RH-MCM-41 by temperature programmed desorption (ethanol-TPD) and thermogravimetric analysis (ethanol-TGA). Evolution of gases from the ethanol-TPD indicated the role of oxides as potential oxygen supplier in ethanol oxidation. On the monometallic catalyst containing oxides of Co, Cu, and Mn on MCM-41, the oxide of Co was the better oxygen supplier than that of the others to react with the adsorbed ethanol to produce CO2. Furthermore, the bimetallic 0.5Pt–15Co/RH-MCM-41 with cobalt in the form of Co3O4, showed the highest ethanol adsorption and CO2 desorption. Consequently, ethanol oxidation was studied on the bimetallic 0.5Pt–15Co/RH-MCM-41 by in situ infrared spectroscopy in which intermediates and reaction pathways were proposed when ethanol and oxygen were flowed through the cell at various temperatures. Results from the ethanol oxidation in a fixed bed flow reactor showed that the bimetallic catalyst gave lower ethanol conversion than monometallic Pt but seemed to be more stable than the monometallic Pt catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CO2 was generated from ethanol desorption from Co/MCM-41 and Pt–Co/MCM-41. ► Possible adsorption modes and surface species were proposed. ► Surface species from ethanol oxidation on Pt and Pt–Co catalysts were confirmed. ► The mechanisms of ethanol oxidation were proposed. ► The Pt was more active than the Pt–Co catalyst but seemed to deactivate faster.

Keywords
Ethanol adsorption; Ethanol oxidation; Bimetallic catalyst; MCM-41; Platinum; Cobalt
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Ethanol adsorption and oxidation on bimetallic catalysts containing platinum and base metal oxide supported on MCM-41
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 225–235
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