Room temperature O 2 plasma treatment of SiO 2 supported Au catalysts for selective hydrogenation of acetylene in the presence of large excess of ethylene

Xiaoyan Liu, Chung Yuan Mou, Szetsen Lee, Yanan Li, Jeremiah Secrest, Ben W.L. Jang

研究成果: 雜誌貢獻文章同行評審

100 引文 斯高帕斯(Scopus)

摘要

Supported gold nanoparticles have been proven to be active in the hydrogenation of the acetylene. In this work, we applied gold nanoparticles supported on silica for the selective hydrogenation of acetylene in excess ethylene that was close to current industrial practices. Amine group surface-functionalized silica was used to absorb the gold precursor AuCl4-, and small size-controlled gold nanoparticles are formed after chemical reduction. For the first time, O 2 plasma was employed to remove the APTES grafted on the surface of silica for preparing the highly dispersed gold nanoparticles (∼3 nm). The results of IR, TGA, XRD, and TEM showed that O 2 plasma working under mild conditions (room temperature and low pressure) can efficiently remove the organic compounds without causing the aggregation of the gold nanoparticles. The plasma-treated catalyst Au/SiO 2 gave excellent low-temperature selective catalytic activity in the hydrogenation of acetylene. The effects of the reduction temperatures on the catalytic performances of the Au/SiO 2 were investigated. The enhanced performance of gold nanoparticles supported on silica as pretreated by O 2 plasma was ascribed to two effects: (1) the small size of the gold nanoparticles supported on silica, (2) the nearly neutral charge on the Au nanoparticle, which is favorable to the activation of hydrogen.

原文英語
頁(從 - 到)152-159
頁數8
期刊Journal of Catalysis
285
發行號1
DOIs
出版狀態已發佈 - 1月 2012
對外發佈

ASJC Scopus subject areas

  • 催化
  • 物理與理論化學

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