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- W1601311897 abstract "CO2-reforming of CH4 was studied from the viewpoint of the suppression of carbon deposition. Ni/A2lO3 catalyst was modified by adding basic metal oxides or replaced with the disulfides of Mo and W for such purpose. The oxides of Na, K, Mg, and Ca markedly decreased the activity of a supported Ni for CH4 decomposition and also suppressed carbon deposition during CO2-CH4 reaction. These metal oxides altered the reaction kinetics in a way of the reaction order with respect to the CH4 partial pressure from negative to positive and that with respect to the CO2 partial pressure from positive to negative. Similar results were also obtained on MoS2 and WS2 catalysts. Their activity for CH4 decomposition was much smaller than that of supported Ni and carbon deposition was markedly suppressed during CO2- reforming on the disulfide catalysts. Reaction kinetics was the same as that on the modified Ni/Al2O3 catalyst: positive order with respect to the CH4 partial pressure and negative order with respect to the CO2 partial pressure. The reaction kinetics observed is understood in terms of the idea that the addition of basic metal oxides or the replacement with the disulfides changes an abundant species on the catalyst surface from CH4 to CO2. It is considered that CO2-reforming of CH4 is initiated by the dissociation of adsorbed CH4 followed by the reaction of the resultant adsorbed hydrogen-deficient hydrocarbon species (CHx,ad) with adsorbed oxygen atoms (Oad) derived from CO2[1]. When a counterpart species, like Oad, is not sufficient on the catalyst surface, CHx,ad is easily converted to surface carbon. Therefore, the cause for the observed suppression of carbon deposition is attributed to the decreased activity for CH4 decomposition and to the enhancement of CO2 adsorption on modified Ni/Al2O3 and disulfide catalysts, which assures respectively a limited concentration of CHx,ad and a sufficient concentration of Oad." @default.
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- W1601311897 date "1999-01-01" @default.
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- W1601311897 title "Suppression of carbon deposition during the CO2-reforming of CH4 by the enhancement of CO2 adsorption" @default.
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- W1601311897 doi "https://doi.org/10.1016/s0167-2991(99)80487-x" @default.
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