The Nature of the Isolated Gallium Active Center for Propane Dehydrogenation on Ga/SiO 2
作者: Viktor J. CybulskisShankali U. PradhanJuan J. Lovón-QuintanaAdam S. HockBo HuGuanghui ZhangW. Nicholas DelgassFabio H. RibeiroJeffrey T. Miller
作者单位: 1Purdue University
2Illinois Institute of Technology
3Argonne National Laboratory
刊名: Catalysis Letters, 2017, Vol.147 (5), pp.1252-1262
来源数据库: Springer Nature Journal
DOI: 10.1007/s10562-017-2028-2
关键词: DehydrogenationEXAFSNEXAFSHeterogeneous catalysisXPS
英文摘要: Single-site Ga/SiO2 catalysts exhibit up to 99% C3H6 selectivity at 4% propane conversion with an initial rate of 5.4 × 10−4 (mole C3H6) (mole Ga)−1 s−1 during propane dehydrogenation (PDH) at 550 °C. Following pre-treatment in H2 at 550 °C, only four-coordinate, Ga3+–O Lewis acid sites are observed under reaction conditions. At 650 °C in H2, an additional isolated Ga site with lower Ga–O coordination ( N Ga−O < 4) is formed and leads to a 30% decrease in the initial PDH rate per total moles of Ga. The PDH rates are equivalent when normalized by the amount of surface, four-coordinate Ga3+–O, regardless of catalyst pre-treatment conditions, which...
原始语种摘要: Single-site Ga/SiO2 catalysts exhibit up to 99% C3H6 selectivity at 4% propane conversion with an initial rate of 5.4 × 10−4 (mole C3H6) (mole Ga)−1 s−1 during propane dehydrogenation (PDH) at 550 °C. Following pre-treatment in H2 at 550 °C, only four-coordinate, Ga3+–O Lewis acid sites are observed under reaction conditions. At 650 °C in H2, an additional isolated Ga site with lower Ga–O coordination ( N Ga−O < 4) is formed and leads to a 30% decrease in the initial PDH rate per total moles of Ga. The PDH rates are equivalent when normalized by the amount of surface, four-coordinate Ga3+–O, regardless of catalyst pre-treatment conditions, which...
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影响因子:2.244 (2012)

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关键词翻译
关键词翻译
  • propane 丙烷
  • catalysis 催化
  • selectivity 选择性
  • catalyst 催化剂
  • catalytically 催化地
  • reaction 反酌
  • coordinate 坐标
  • conversion 转换
  • coordination 配位
  • amount 总计