The Isoporpylation of Biphenyl over H-Mordenites. : Roles of External Surface in Shape-Selective Catalysis

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概要

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• Influences of external surface and total areas of some H-mordenites (HM) were examined to elucidate the role of external acid sites in the isopropylation of biphenyl (BP). The several types of HM (SiO_2/Al_2O_3 ratio: 12-19; BET surface area 480-500 m^2/g; external surface area: 0.1-25 m^2/g) were obtained commercially or synthesized by the methods referred to the literature for ZSM-5 and other zeolites. The selectivity for 4,4' -diisopropylbiphenyl (4,4' -DIPB) was almost constant for all HMs in the isopropylation; however, the catalytic activity was varied by samples. H-Mordenites with different particle size HM[a] (average particle size 2 μm; SiO_2/Al_2O_3=18.7; external surface area: 17 m^2/g) and HM[b] (average particle size 1 μm; SiC^/Al_2O_3=15.7; external surface area: 25 m^2/g) were dealuminated by the combination of steam treatment at 600 ℃ and acid leaching at 80 ℃. The selectivity for 4,4' -DIPB was in the similar level for both series of HMs in the range of SiO_2/Al_2O_3 ratio from 20 to 400. However, the catalytic activity was varied with the ratio. These results from two types of HMs show that selective formation of 4,4' -DIPB occurred inside the pores of HMs, that the external acid sites did not play an important role on the shape-selectivity, and that catalytic activities for the isopropylation were influenced by external surface area.

• 一般社団法人日本エネルギー学会の論文
• 2004-12-20

著者

• Hanaoka Taka-aki

  Laboratory For Membrane Chemistry Advanced National Institute Of Science And Technology

• TAWADA Shogo

  Department of Materials Science and Technology, Faculty of Engineering, Gifu University

• KUBOTA Yoshihiro

  Department of Materials Science and Technology, Faculty of Engineering, Gifu University

• SUGI Yoshihiro

  Department of Materials Science and Technology, Faculty of Engineering, Gifu University

• KIYOZUMI Yoshimichi

  Laboratory for Membrane Chemistry, Advanced National Institute of Science and Technology

• MIZUKAMI Fujio

  Laboratory for Membrane Chemistry, Advanced National Institute of Science and Technology

• Tawada Shogo

  Department Of Materials Science And Technology Faculty Of Engineering Gifu University

• Kiyozumi Y

  Laboratory For Membrane Chemistry Advanced National Institute Of Science And Technology

• Kubota Yoshihiro

  Department Of Materials Science And Technology Faculty Of Engineering Gifu University

• Mizukami Fujio

  Laboratory For Membrane Chemistry Advanced National Institute Of Science And Technology

• Sugi Y

  Department Of Materials Science And Technology Faculty Of Engineering Gifu University

• Sugi Yoshihiro

  Department Of Chemistry Faculty Of Engineering Gifu University

• Kiyozumi Yoshimichi

  Laboratory For Membrane Chemistry Aist Tohoku

• Kubota Yoshihiro

  Department Of Advanced Materials Chemistry Graduate School Of Engineering Yokohama National Universi

• Sugi Yoshihiro

  Department of Applied Science, Faculty of Engineering, Tohoku University

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