| Project/Area Number |
02453072
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学・複合材料
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
ARATA Kazushi Hokkaido University of Education at Hakodate, Professor., 教育学部函館分校, 教授 (50002548)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Hideo Hokkaido University of Education at Hakodate, Assistant Professor., 教育学部函館分校, 助手 (30207906)
MATSUHASHI Hiromi Hokkaido University of Education at Hakodate, Associated Professor., 教育学部函館分校, 助教授 (70192341)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Superacid / Solid Superacid / Metal Oxide / Catalyst |
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| Research Abstract |
Solid superacid catalysts were obtained by impregnating hybroxides or amorphous oxides of Zr, Sn, Ti, and Fe with ammonium metatungstate followed by evaporating water and calcining in air. The catalysts were active for reactions of hydrocarbons such as butanes and pentanes; the catalysts were also active for the acylation of toluene with benzoic anhydride. The maximum activity was observed with calcination at 800-850ﾟC for the cayalyst of Zr, 1000ﾟC for that of Sn, and 700ﾟC for those of Ti and Fe (11-13 wt% W). From DTA and XRD measurements in addition to the results of catalytic activities, it was concluded that superacid sites were not created by impregnation on the crystallized oxide, but on the amorphous form followed by calcination to the crystallization, XRD patterns being different between the materials prepared from the crystallized oxides and those from the amorphous ones. XPS showed the catalysts to be WO_3 supported on ZrO_2, SnO_2, TiO_2, and Fe_2O_3.
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