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Evaluation of Pd-based catalysts and the influence of operating conditions for autothermal reforming of dimethyl ether

Paper ID Volume ID Publish Year Pages File Format Full-Text
48495 46510 2007 9 PDF Available
Title
Evaluation of Pd-based catalysts and the influence of operating conditions for autothermal reforming of dimethyl ether
Abstract

A series of different Pd-based catalysts supported on ceramic monoliths were synthesized and tested in a screening study for autothermal reforming of dimethyl ether (DME). Alumina-supported Pd was shown to be very active for this reaction at temperatures between 350 and 400 °C. Adding Zn to Pd/γ-Al2O3 decreased the activity of decomposition reactions leading to better reforming activity, and resulting in high selectivity to carbon dioxide. Pd-Zn/γ-Al2O3 was further evaluated in a parameter study varying oxygen-to-DME ratio, steam-to-DME ratio and temperature. The effect on the reformer performance of changing the operating conditions is discussed. The Pd-Zn/γ-Al2O3 catalyst generated carbon monoxide concentrations below 5%, and hydrogen concentrations close to 50%. The catalyst performance was significantly improved by preconditioning in hydrogen. Results from a first round of catalyst characterization studies suggest that Pd–Zn species are formed on the alumina support following reduction.

Keywords
Hydrogen; Autothermal reforming; Dimethyl ether; Auxiliary power unit
First Page Preview
Evaluation of Pd-based catalysts and the influence of operating conditions for autothermal reforming of dimethyl ether
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 76, Issues 1–2, 30 October 2007, Pages 42–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis