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Limiting mechanisms in catalytic steam reforming of dimethyl ether

Paper ID Volume ID Publish Year Pages File Format Full-Text
47274 46466 2010 7 PDF Available
Title
Limiting mechanisms in catalytic steam reforming of dimethyl ether
Abstract

The limiting mechanisms in dimethyl ether steam reforming (DME SR) are experimentally investigated over the nanocomposite catalysts of Cu spinel and alumina. The dominant reactions involved in DME SR are proved to be DME hydrolysis to methanol over acidic sites of alumina and subsequent methanol steam reforming to H2 and CO2 over Cu sites, followed by reverse-water gas shift reaction. The contribution of other side reactions is also clearly evaluated. DME hydrolysis is limited by the equilibrium, and the hydrolysis rate was much slower than the methanol SR rate, and thus was a rate-determining step in DME SR. The deactivation of Cu spinel was significantly faster than that of alumina, and would determine the lifetime of the composite catalysts. With varied superficial velocities up to 5.2 cm s−1 (25 °C, 1 atm), the evidence of mass transfer-limiting mechanism and reaction-limiting mechanism was observed in the low flow rate and the high flow rate regions, respectively.

Keywords
Limiting mechanism; Steam reforming; Dimethyl ether; Deactivation; Hydrogen fuel cell
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 97, Issues 1–2, 9 June 2010, Pages 21–27
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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