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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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

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Silicates
Gallium
Aromatic hydrocarbons
Dehydrogenation
Linewidth
Gels
Physical properties

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Nagata, H., Takiyama, Y., Higashida, K., Otsuka, S., Shoji, H., Kishida, M., & Wakabayashi, K. (1998). Environments of Ga in MFI-Type Ga-silicates and their catalytic performances. Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute), 41(4).

Environments of Ga in MFI-Type Ga-silicates and their catalytic performances. / Nagata, Hideo; Takiyama, Yoshihiro; Higashida, Kenji; Otsuka, Shuhei; Shoji, Hiroshi; Kishida, Masahiro; Wakabayashi, Katsuhiko.

In: Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute), Vol. 41, No. 4, 01.12.1998.

Research output: Contribution to journalArticle

Nagata, H, Takiyama, Y, Higashida, K, Otsuka, S, Shoji, H, Kishida, M & Wakabayashi, K 1998, 'Environments of Ga in MFI-Type Ga-silicates and their catalytic performances', Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute), vol. 41, no. 4.
Nagata, Hideo ; Takiyama, Yoshihiro ; Higashida, Kenji ; Otsuka, Shuhei ; Shoji, Hiroshi ; Kishida, Masahiro ; Wakabayashi, Katsuhiko. / Environments of Ga in MFI-Type Ga-silicates and their catalytic performances. In: Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute). 1998 ; Vol. 41, No. 4.
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