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

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  • 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
  • HANAOKA Taka-aki
    Laboratory for Membrane Chemistry, Advanced National Institute of Science and Technology
  • MIZUKAMI Fujio
    Laboratory for Membrane Chemistry, Advanced National Institute of Science and Technology

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  • Isoporpylation of Biphenyl over H Mordenites Roles of External Surface in Shape Selective Catalysis

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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).<BR>The several types of HM (SiO2/Al2O3 ratio: 12-19; BET surface area 480-500 m2/g; external surface area: 0.1-25m2/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.<BR>H-Mordenites with different particle size HM [a] (average particle size 2μm; SiO2/Al2O3=18.7; external surface area: 17m2/g) and HM [b] (average particle size 1μm; SiO2/Al2O3=15.7; external surface area: 25m2/g) were dealuminated by the combination of steam treatment at 600°C and acid leaching at 80°C. The selectiv-ity for 4, 4'-DIPB was in the similar level for both series of HMs in the range of SiO2/Al2O3 ratio from 20 to 400. However, the catalytic activity was varied with the ratio.<BR>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.

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