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Carbonization of nickel catalysts and its effect on methane dry reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
40382 45852 2013 9 PDF Available
Title
Carbonization of nickel catalysts and its effect on methane dry reforming
Abstract

Formation and reactivity of carbon in Ni/Al2O3 catalysts of methane dry reforming (MDR) have been studied at their interaction with CH4, CO2, H2 or CH4–CO2 mixture using thermogravimetry and mass-spectrometry. Temperature ranges of carbon accumulation and removal have been established, with a temperature hysteresis of carbon accumulation being observed in CH4–CO2 mixture. The primary deposited carbon blocks MDR activity, but the deactivation is reversible under MDR conditions. The primary carbon transforms into the secondary nanofiber carbon which is stable under MDR conditions and less blocks MDR activity. Effect of Ni catalysts deactivation because of carbonization can be reduced, if at the initial stage the catalyst does not contact with the reaction mixture at temperatures below 700 °C. The rate of carbon accumulation was increased with increasing Ni particle size from 2 to 5 nm.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (172 K)Download as PowerPoint slideHighlights► Conditions of Ni catalysts carbonization during methane dry reforming were established. ► Temperature hysteresis of carbon accumulation was observed. ► At least, two carbon forms cause complicated deactivation behavior. ► Carbonization rate depends on Ni particle size.

Keywords
CO2 reforming of methane; Nickel catalysts; Thermogravimetry; Carbon deposition; Catalyst deactivation; Carbon nanofibers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 71–79
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
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Price after discount Only $4.95
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Full-text PDF Download
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