Catalytic partial oxidation of methane using RhSr- and Ni-substituted hexaaluminates |
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Authors: | Huayang Zhu Robert J Kee Jeffrey R Engel David T Wickham |
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Institution: | aColorado School of Mines, Golden, CO 80401, USA;bTDA Research, Inc., Wheat Ridge, CO 80033, USA |
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Abstract: | This paper reports the results of experimental and modeling efforts to characterize partial oxidation of methane to produce synthesis gas (H2 and CO) using metal-substituted hexaaluminate catalysts in short-contact-time reactors. Hexaaluminate catalysts offer excellent high-temperature stability compared to the equivalent metal-based catalysts. The hexaaluminates are synthesized by a metal-exchange process using alumoxane precursors that enable a wide range of metal substitutions. Of all the combinations tested, RhSr-substituted hexaaluminates yielded the best performance. The catalysts are supported on alumina porous-foam structures, which are positioned within a tube furnace to control the operating temperature. Two-stage combinations of RhSr- and Ni-substituted hexaaluminates are shown to improve conversion activity and selectivity compared to a single-catalyst system. |
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Keywords: | Partial oxidation Catalysis Hexaaluminate Syngas Porous media |
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