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Photoacoustic investigations of CO2–CH4 reaction catalyzed by nickel particles embedded into SBA15 mesopores

Paper ID Volume ID Publish Year Pages File Format Full-Text
42497 45928 2009 6 PDF Available
Title
Photoacoustic investigations of CO2–CH4 reaction catalyzed by nickel particles embedded into SBA15 mesopores
Abstract

A photoacoustic spectroscopy technique was employed to the kinetic study of the CO2/CH4 reaction catalyzed by Ni particles embedded into the mesochannels of SBA15. The catalytic CO2/CH4 reaction was performed in a closed-circulating reactor system at various partial pressures of CO2 and CH4 (40 Torr total pressure) in the temperature range of 500–700 °C. The CO2 photoacoustic signal that varied with the concentration of CO2 during the catalytic reaction was recorded as a function of time by using a differential photoacoustic cell. Under the reaction conditions, the CO2 photoacoustic measurements showed the SBA15 compound used as support to be inactive for the reaction. The CO2/CH4 reaction carried out in the presence of the H2-reduced Ni/SBA15 catalyst showed significant time-dependent changes in the CO2 photoacoustic signal, while the reaction performed in the presence of the as-prepared Ni/SBA15 catalyst did not. The CO2 photoacoustic signal obtained at early reaction times provided precise data of the CO2 disappearance rate. The rate of CO2 disappearance was observed to increase with increasing temperature in the range of 500–700 °C. The apparent activation energy for the CO2 consumption in the Ni/SBA15 catalyzed reaction was calculated to be 6.2 kcal/mol. Reaction orders, determined from initial rates of CO2 disappearance at various PCO2PCO2’s and PCH4PCH4’s at 700 °C, were found to be 0.28 for CH4 and 0.39 for CO2, respectively. The kinetic results were compared with those previously reported and were used to infer a catalytic reaction mechanism for the CO2/CH4 reaction at low pressures.

Graphical abstractA CO2 reforming of methane catalyzed by nickel particles embedded into SBA15 mesopores was kinetically analyzed by using the CO2 laser-based photoacoustic technique. The photoacoustic signal obtained at early reaction times provided precise data of CO2 disappearance rates. The apparent activation energy and the orders of the reaction were thus obtained to discuss the catalytic reaction mechanism for the CO2/CH4 reaction.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photoacoustic spectroscopy (PAS); CO2 reforming of methane; CO2 monitoring; Ni/SBA15 catalyst
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Photoacoustic investigations of CO2–CH4 reaction catalyzed by nickel particles embedded into SBA15 mesopores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 368, Issues 1–2, 31 October 2009, Pages 50–55
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