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Methane conversion reactions on Ni catalysts promoted with Rh: Influence of support

Paper ID Volume ID Publish Year Pages File Format Full-Text
41337 45885 2011 10 PDF Available
Title
Methane conversion reactions on Ni catalysts promoted with Rh: Influence of support
Abstract

Ni catalysts supported on γ-Al2O3 and Mg(Al)O were prepared with and without Rh as a promoter and tested in the reforming of methane in the presence of excess methane, simulating a model biogas. The effects of adding synthetic air on the methane conversion and the formation of carbon were assessed. The catalysts were characterized by X-ray spectroscopy (EDS), surface area (BET), X-ray diffraction (XRD), Temperature-programmed reduction (TPR), X-ray absorption near-edge structure (XANES) and XPD. The results showed that in catalysts without Rh, the Ni interacts strongly with the supports, showing high reduction temperatures in TPR tests. The addition of Rh increased the amount of reducible Ni and facilitated the reduction of the species interacting strongly with the support. In the catalytic tests, the samples promoted with Rh suffered higher carbon deposition. The in situ XPD suggested that on the support γ-Al2O3, the presence of Rh probably led to a segregation of Ni species with time on stream, leading to carbon deposition. On the support MgAlO, the presence of Rh improved the dispersion of Ni, by reducing the Ni0 crystallite size, suggesting that in this case the carbon deposition was due to a favoring of CH4 decomposition by Rh.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (78 K)Download as PowerPoint slideHighlights► Ni catalysts supported on γ-Al2O3 and Mg(Al)O were prepared with and without Rh. ► The catalysts were tested in the reforming of biogas with synthetic air addition. ► Rh increased the amount of reducible Ni species and improved the dispersion of Ni0. ► Rh samples suffered higher C deposition due to a promotion of decomposition of CH4.

Keywords
Catalyst; Nickel; Hydrotalcite; Methane; Reforming
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Methane conversion reactions on Ni catalysts promoted with Rh: Influence of support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 400, Issues 1–2, 30 June 2011, Pages 156–165
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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