Citation:
YANG Peng, FAN Guang-Yin MA Xiao-Yan, LI Rui-Xiang, LI Xian-Jun, . Study on Selective Hydrogenation of Avermectin to Ivermectin over Ir/γ-Al2O3[J]. Acta Physico-Chimica Sinica,
;2007, 23(10): 1537-1542.
doi:
10.3866/PKU.WHXB20071010
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Catalysts Ir/γ-Al2O3 were prepared by impregnating γ-Al2O3 with an aqueous solution or microemulsion solution ofH2IrCl6. The catalystswere characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and transmission electron microscope (TEM). The catalytic performance of the supportediridiumcatalysts for the selective hydrogenation of avermectin to ivermectin was investigated. Compared with active carbon (AC), α-Al2O3, and TiO2, γ-Al2O3 is a better support in this system. Among Ir, Ru, Pd, and Pt supported on γ-Al2O3, the catalyst Ir/γ-Al2O3 showed the best catalytic activity and selectivity to ivermectin. Ir/γ-Al2O3 prepared by means of microemulsion solution showed the best catalytic activity, but the catalytic selectivity to ivermectin was lower that over Ir/γ-Al2O3 modified with PVP (polyvinylpyrrolidone), which exhibited excellent activity as well as od selectivity.
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