催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (2): 325-332.DOI: 10.3724/SP.J.1088.2011.00941

• 研究论文 • 上一篇    下一篇

载体对负载型 Ni-B 催化剂催化 2-乙基蒽醌加氢制 H2O2反应性能的影响

陈雪莹, 乔明华, 贺鹤勇   

  1. 复旦大学化学系, 上海市分子催化和功能材料重点实验室, 上海 200433
  • 收稿日期:2010-09-28 修回日期:2010-11-12 出版日期:2011-01-26 发布日期:2014-06-25

Effects of Supports on Catalytic Properties of the Supported Ni-B Catalysts for Selective Hydrogenation of 2-Ethylanthraquinone to H2O2

CHEN Xueying*, QIAO Minghua, HE Heyong   

  1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
  • Received:2010-09-28 Revised:2010-11-12 Online:2011-01-26 Published:2014-06-25

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摘要： 采用还原剂浸渍法将 Ni-B 非晶态合金负载到 SiO2, γ-Al2O3 和活性炭 (AC) 上, 以 2-乙基蒽醌选择加氢制 H2O2 为探针反应, 系统研究了载体对 Ni-B 非晶态合金催化剂结构、热稳定性和催化性能的影响. 结果表明, 将 Ni-B 负载到载体上后, 其晶化温度显著提高, 各催化剂热稳定性依次为 Ni-B/AC > Ni-B/SiO2 > Ni-B/γ-Al2O3; 催化剂活性依次为 Ni-B/SiO2 > Ni-B/γ-Al2O3 > Ni-B/AC; 羰基加氢选择性依次为 Ni-B/AC > Ni-B/SiO2 > Ni-B/γ-Al2O3. 各催化剂加氢活性差异主要归因于其活性比表面积和载体孔结构的不同; 羰基加氢选择性差异主要由催化剂上活性位的均一程度和载体表面性质的不同所致.

关键词: 镍, 硼, 非晶态合金, 二氧化硅, 氧化铝, 活性炭, 负载型催化剂, 2-乙基蒽醌, 加氢, 过氧化氢

Abstract: Supported Ni-B amorphous alloy catalysts were prepared by a reductant-impregnation method using commercial SiO2, γ-Al2O3, and active carbon (AC) as supports. The effects of the supports on the texture, thermal stability, and catalytic properties of the supported Ni-B catalysts in selective hydrogenation of 2-ethylanthraquinone (eAQ) to H2O2 were studied. It was found that the crystallization temperature of the supported Ni-B catalysts is much higher than ultrafine Ni-B and the stability sequence is Ni-B/AC > Ni-B/SiO2 > Ni-B/γ-Al2O3. The catalytic activity of the supported Ni-B catalysts is in the order Ni-B/SiO2 > Ni-B/γ-Al2O3 > Ni-B/AC, and the C=O selectivity is Ni-B/AC > Ni-B/SiO2 > Ni-B/γ-Al2O3. The different activity of the supported Ni-B catalysts can be attributed to the deviation in the active surface area of the catalysts and the different pore structure of the supports. The different selectivity can be attributed to the different uniformity of the active sites on the catalysts and the different surface properties of the supports.

Key words: nickel, boron, amorphous alloy, silica, alumina, active carbon, supported catalyst, 2-ethylanthraquinone, hydrogenation, hydrogen peroxide