Environments of Ga in MFI-Type Ga-silicates and their catalytic performances

Hideo Nagata, Yoshihiro Takiyama, Kenji Higashida, Shuhei Otsuka, Hiroshi Shoji, Masahiro Kishida, Katsuhiko Wakabayashi

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2 Citations (Scopus)

Abstract

MPI-Type Ga-silicates with various Si/Ga ratios were synthesized from gels prepared using two different preparation methods: an alkoxide method ((A)) and a Mobil method ((M)). Gallium-silicates(A) from an alkoxide method were compared with Ga-silicates(M) from a Mobil method in terms of their physical properties and catalytic performances in C4H10 conversion-reaction. The line width of a peak assigned to tetrahedral GaO4 in the 71Ga-MASNMR spectrum of Ga-silicate(M) was broader than that of Ga-silicate(A), and the unit cell volume of Ga-silicates(M) was less than that of Ga-silicates(A) of high Ga content. It is considered, therefore, that the tetrahedral GaO4 incorporated into Ga-silicates(M) might have a lower symmetry than that incorporated into Ga-silicates(A). Further, the tetrahedral GaO4 with low symmetry might be easily eluted from the silicate framework, because the amount of Ga elution from Ga-silicate(M) by treatment with HCl solution was greater than that from Ga-silicate(A) of high Ga content. Gallium-silicates(A) yielded more aromatic hydrocarbons from C4H10 than Ga-silicates(M) of high Ga content. It is concluded that the tetrahedral GaO4 with lower symmetry might have a higher dehydrogenation activity.

Original languageEnglish
Number of pages1
JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume41
Issue number4
Publication statusPublished - Dec 1 1998

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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