期刊
JOURNAL OF CATALYSIS
卷 223, 期 1, 页码 236-239出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2004.01.014
关键词
epoxidation of styrene; styrene oxide; Au/MgO catalyst; AU/alkaline earth oxides
Gold nanoparticles deposited on MgO, CaO, SrO, and BaO by homogeneous deposition-precipitation using urea are, for the first time, reported to be novel highly active/selective and reusable catalysts in the epoxidation of styrene to styrene oxide (SO) by anhydrous t-butyl hydroperoxide Au/MgO prepared by deposition-precipitation using NaOH is also studied in styrene epoxidation. The slightly poorer performance of Au/MgO prepared by deposition-precipitation in epoxidation of styrene (conversion: 44.6%, SO selectivity: 36.1%), as compared with to the gold catalysts prepared on alkaline earth oxides by homogeneous deposition-precipitation (styrene conversion: greater than or equal to 53%, SO selectivity: 45-60%), is attributed to the lower loading (4.1 wt%), larger particle size (D-Au = 17.9 nm), and possible presence of trace impurities (Na+ and Cl-) in the former. Higher gold loading (4.7-7.5 wt%) and smaller gold particles (D-Au congruent to 8.0 nm) were observed in the alkaline earth-supported An catalysts prepared by homogeneous deposition-precipitation. (C) 2004 Published by Elsevier Inc.
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