Hydrogen production from partial oxidation and reforming of DME
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Catalysis Letters Vol. 102, Nos. 3–4, August 2005 (Ó 2005) DOI: 10.1007/s10562-005-5855-5
Hydrogen production from partial oxidation and reforming of DME Qijian Zhanga,b, Xiaohong Lia, Kaoru Fujimotoa, and Kenji Asamia,* a
Department of Chemical Processes and Environments, Faculty of Environmental Engineering, The University of Kitakyushu, Hibikino 1-1, Wakamatsu-ku, Kitakyushu Fukuoka, 808-0135, Japan b College of Material and Chemical Engineering, Liaoning Institute of Technology, Jinzhou, Liaoning, 121001, P. R. China
Received 15 December 2004; accepted 29 March 2005
Hydrogen production from partial oxidation and reforming of dimethyl ether (DME) was investigated with a fixed bed continuous-flow reactor. H2 yield of over 90% was obtained with 100% DME conversion at 700 °C over Pt/Al2O3+Ni–MgO dual catalyst bed, while keeping CH4 yield at low level. Such results indicated that partial oxidation and reforming of DME to produce hydrogen at high temperature is possible and effective. KEY WORDS: hydrogen production; partial oxidation; reforming; DME.
1. Introduction The quick development of the global economy requires more and more energy supply, while the deteriorating environment requires more and more stringent restriction for the emissions. Both of the energy requirement and the emission restriction stimulate research on clean and high energy efficient power generating technology. Fuel cell is known as a clean and efficient electrical generator for both mobile and stationary applications, and it is considered as the next generation of energy supply. Fuel cell usually uses hydrogen (or hydrogen-rich gas) as fuel. Currently, the application of pure hydrogen suffers from low energy density, high safety risk and extreme difficulty in storage and transportation. It is necessary to find some hydrogen carriers as a substitute of pure hydrogen so as to overcome the above disadvantages. Dimethyl ether (DME) is one of the most promising candidates, because of its high H/C ratio, high energy volumetric density, and it can be stored, transported and handled conveniently, just like LPG due to the similar physical properties. Comparing to methanol, another potential candidate, DME is non-corrosive, non-carcinogenic and virtually non-toxic. In addition, DME can also be synthesized directly from syngas, just as methanol, and the direct synthesis process is more economically profitable and more thermodynamically favorable than methanol synthesis. DME, therefore, is believed to play an important role in future’s energy supply system. Literature survey showed that there were only a few articles concerning with H2 production from DME by steam reforming via the hydration of DME to methanol at 200–350 °C [1,2]. H2 so produced may be suitable for * To whom correspondence should be addressed. E-mail: [email protected]
fuel cells operated at low temperature, such as polymer electrolyte membrane fuel cell (PEMFC). But for PEMFC, CO must be eliminated from the reformate, because it will poison the Pt catalyst of the fuel cell and cause s
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