Epoxidation of styrene by anhydrous t-butyl hydroperoxide over reusable gold supported on MgO and other alkaline earth oxides

Patil, N. S. ; Uphade, B. S. ; Jana, P. ; Bharagava, S. K. ; Choudhary, V. R. (2004) Epoxidation of styrene by anhydrous t-butyl hydroperoxide over reusable gold supported on MgO and other alkaline earth oxides Journal of Catalysis, 223 (1). pp. 236-239. ISSN 0021-9517

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00219...

Related URL: http://dx.doi.org/10.1016/j.jcat.2004.01.014

Abstract

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: ≥ 53%, SO selectivity: 45-60%), is attributed to the lower loading (4.1 wt%), larger particle size (DAu = 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 (DAu ≅ 8.0 nm) were observed in the alkaline earth-supported Au catalysts prepared by homogeneous deposition-precipitation.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Epoxidation of Styrene; Styrene Oxide; Au/MgO Catalyst; Au/Alkaline Earth Oxides
ID Code:10406
Deposited On:03 Nov 2010 16:35
Last Modified:28 May 2011 11:15

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