화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.10, No.3, 454-459, May, 2004
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Hydroisomerization of n-Heptane over Modified USY-Supported H3PW12O40 Catalysts: Effect of Hydrothermal Treatment for USY
Jun Wang†, Dongmei Jiang, Jin-Ook Baeg1, and Chul Wee Lee1
  • College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
  • 1Chemical Technolgy Division, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
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We have prepared Pt-bearing modified USY-supported 12-tungstophosphoric acid catalysts from supports that were treated hydrothermally at various temperatures and time. The catalysts were characterized by XRD, IR spectroscopy, and NH3-TPD techniques, and measured for their hydroisomerization of n-heptane in an atmospheric fixed-bed microreactor. We found that the PW-bearing catalysts showed much higher catalytic activity than do the PW-free counterparts, and that the hydrothermal conditions for the USY support could influence the catalytic activity substantially. Hydrothennal treatment at 650 ℃ for 5 h was the optimum treatment condition; it leads to a high conversion of n-heptane (30.1%) with a very high selectivity for isomerization (98.2%). We discuss the catalytic activities in relation to the physical and chemical properties of the catalysts.
Keywords:12-tungstophosphoric acid;USY;hydrothermal treatment;hydroisomerization of n-heptane
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