2-4-1 Ni-Al_2O_3触媒を用いる高圧酸化的改質における希釈材の効果(2-4 天然ガス科学,Session2 天然ガス・メタンハイドレート等,研究発表)

概要

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Dilution of the catalyst bed of Ni-catalyst is essential for preventing hot-spot formation during high pressure partial oxidation of methane. Particle size distribution of α-Al_2O_3 was narrowed to a few μm size after the precourser was changed from γ-Al_2O_3 to Bohmite. Selectivity to syngas was improved using this alumina as a diluent and as a catalyst carrier at high space velocity feed where oxygen conversion was below 100%. The result suggests that total oxidation of methane and syngas was suppressed. A variety of Ni-K-Al_2O_3 catalysts were prepared according to L_9 orthogonal array, and activity tests of the catalysts were conducted. The selectivity to H_2 and physical properties of the catalyst (BET surface area, NiO crystalline size, etc.) were regressed by NiO loading, K loading, and calcination temperature of Bohmite. The regression models were constructed by a support vector machine. Analysis of the models suggested that the H_2 selectivity is related to BET surface area.
2011-08-09