| Project/Area Number |
05650778
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
NAGAI Masatoshi Tokyo University of Agriculture and Technology, Graduate School of Bio-Applications and Systems Engineering, Associated Professor, 大学院・生物システム応用科学研究科, 助教授 (20111635)
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| Co-Investigator(Kenkyū-buntansha) |
OMI Shinzo Tokyo University of Agriculture and Technology, Graduate School of Bio-Applicati, 大学院・生物システム応用科学研究科, 教授 (70016393)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | New Catalyst / Mo Nitrides / Surface Structure / Adsorption Property / 昇温脱離法 / 細孔分布 |
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| Research Abstract |
1.The 12.5%-97.1% MoO_3/Al_2O_3 catalysts were fully nitrided at 700ﾟC for 3 h with a high space velocity and low speed of increasing nitriding temperature.
2.The Mo species were formed in the samples : MoO_3 (Fresh) was reduced to MoO_2 with NH_3 at 500ﾟC and finally transformed to Mo metal (900ﾟC nitriding) through Mo nitride (700ﾟC nitriding).
The activity of the 700ﾟC-nitrided 97.1% Mo/Al_2O_3 catalyst was the highest, while that of the 500ﾟC-nitrided was second, in the hydrodenitrogenation of carbazole. The 900ﾟC-nitrided catalyst showed low activity. For the 12.5% nitrided catalyst, however, the 900ﾟC-nitrided catalyst was the most active and the 700ﾟC-nitrided catalyst was second. From the results, the active sites for carbazole hydrodenitrogenation required both Mo_2N (for C-N hydrogenolysis) and Mo metal (for hydrogenation). The surface properties of the nitrided 12.5-97.1% MoO_3/Al_2O_3 catalysts were studied by determining the BET surface area, external surface area, micro volume, and pore size distribution of the catalysts in varying nitriding temperatures. The pore size of the nitrided 12.5% MoO_3/Al_2O_3 increased with increasing nitriding temperature, and the surface was not uniformly rough. This observation supported the adsorption experiment of varying the size of adsorptive molecules for the 12.5wt% Mo nitrides. Fractal dimension increaed from 2.1 to 2.5 and 2.8 corresponding to increase in nitriding temperature from 500ﾟC to 700ﾟC and 900ﾟC,suggesting the increase in irregularity of the surface. Nitriding of the 12.5wt% MoO_3/Al_2O_3 catalysts with NH_3 at high temperature lowered the surface Bronsted acidity of the catalyst and was accompanied by the formation of Lewis acid sites.
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