Abstract
The synthesis and preparation conditions for bimodal pore catalyst support were studied. SiO 2–SiO 2, ZrO 2–SiO 2, or Al 2O 3–SiO 2 bimodal pore support could be optimally prepared by incipient-wetness impregnation (IWI) of silica Q-50 pellet with silica, zirconia or alumina sol, respectively. Pore size measurement results suggested that the obtained bimodal pore supports showed two kinds of pores, mesopores and original macropores, simultaneously. The newly formed mesopores contributed to the increased BET surface area of bimodal pore support, compared with that of the original silica Q-50. Pt catalysts supported on these kinds of supports were tested in CO 2 reforming of CH 4. The performances of Pt/ZrO 2–SiO 2 and Pt/Al 2O 3–SiO 2 bimodal pore catalysts were better. Furthermore, it was found that Pt/Al 2O 3–SiO 2 bimodal catalyst showed better reforming performance than Pt/ZrO 2–SiO 2 bimodal catalyst. And furthermore, CeO 2 modified Pt/Al 2O 3–SiO 2 bimodal pore catalyst exhibited highest activity and stability under the present study conditions.
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