Environmental friendly and highly regioselective oxybromination in an aqueous system using SBA-15 supported sulfated zirconia catalyst

Ai Jan Chen, Xiao Rong Chen, Chung Yuan Mou

研究成果: 書貢獻/報告類型會議貢獻

1 引文 斯高帕斯(Scopus)

摘要

Brominated aromatic compounds have been widely used in synthetic organic chemistry for the manufacturing of many bulk and fine chemicals. In contrast to direct bromination by toxic elemental bromine or HBr, we developed a safe system for oxybromination using hydrogen peroxide and ammonium bromide in the aqueous phase under mild temperature and near neutral conditions over a SBA-15 supported sulfated zirconia (SZ) catalyst. The ready availability of the catalyst and the nearly neutral aqueous solution are the salutary features of this approach. Bromination of aromatics with electron-withdrawing group took place readily, and bromoproducts were produced in moderate to excellent yields. A good to excellent para-selectivity was observed. The SZ/SBA-15 catalyst may be re-used several times without substantial loss of activity. We also studied the catalytic activity of SZ which were supported on mesoporous SBA-15 silica or mesoporous SZ. On bromination silica supported sulfated zirconia (SZ/SBA-15) showed much better catalytic ability for bromination then self-supported SZ (m-SZ). Furthermore, we found the catalytic activity of SZ decreased as the calcinations temperature increased. The good catalytic performance of the SZ/SBA-15 materials was attributed to the well dispersed of sulfate groups to give sulfated silica-zirconia of with (1) very good redox property and (2) high strength and high density of acid sites.

原文英語
主出版物標題Catalytic Materials for Energy, Green Processes and Nanotechnology
頁面107-112
頁數6
出版狀態已發佈 - 2010
對外發佈
事件2009 MRS Fall Meeting - Boston, MA, 美國
持續時間: 11月 30 200912月 3 2009

出版系列

名字Materials Research Society Symposium Proceedings
1217
ISSN(列印)0272-9172

會議

會議2009 MRS Fall Meeting
國家/地區美國
城市Boston, MA
期間11/30/0912/3/09

ASJC Scopus subject areas

  • 一般材料科學
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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