| Project/Area Number |
13650837
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Saitama university |
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Principal Investigator |
MIURA Hiroshi Faculty of engineering, Professor, 工学部, 教授 (60092574)
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| Co-Investigator(Kenkyū-buntansha) |
KUROKAWA Hideki Graduate School of Science and Enginesng, Assistant, 理工学研究科, 助手 (50292652)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | polyaromatic hydrocarbons / naphthalene hydrogenation / supported Pd catalysts / bimetallic catalysts / dimethyldisulfide / metal-sulfur bond strength / mixed oxide / sulfur tolerance / ディーゼル黒煙 / 多環芳香族 / 水素化精製触媒 / Pd触媒 / Pd-Ptバイメタリック触媒 / Al_2O_3-TiO_2 / 複合担体 / 耐硫黄性触媒 |
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| Research Abstract |
To develop useful metal catalysts for hydrogenation of aromatic hydrocarbons in diesel fuel, we have studied naphthalene hydrogenation over supported Pd catalysts in the presence of dimethyldisulfide as a sulfur compound.
(1)Naphthalene hydrogenation over Pd/Al_2O_3, Pd/SiO_2, Pd/TiO_2, Pd/TiO_2-SiO_2, and Pd/TiO_2-Al_2O_3 cal alysts was studied in the presence or absence of dimethyldisulfide (DMDS). As a results, the order of TOP (turn over frequency) was Pd/TiO_2-Al_2O_3 > Pd/TiO_2-SiO_2 > Pd/TiO_2 > Pd/Al_2O_3 > Pd/SiO_2
(2)Pd-Pt/TiO_2 and Pd-Pt/TiO_2 catalysts were prepared by a co-impregnation method and evaluated in the hydrogenation of naphthalene in the presence of dimethyldisulfide. All Pd-Pt/TiO_2 bime tallic catalysts showed the higher TOF than the Pt/TiO_2 catalyst. Pd-Pt/TiO_2 containing 50mol% Pd showed the highest TOF in the catalysts tested. Meanwhile The highest TOF of Pd-Pt/Al_2O_3 were obtained at the content of 80mol% Pd. The TOF of Pd-Pt/Al_2O_3 containing 80mol% Pd was 8 times and 18 times higher than those of Pd/Al_2O_3 and Pt/Al_2O_3, respectively.
(3)As compared with Pd/Al_2O_3,Pd/TiO_2 showed high TOF and sulfur tolerance, in both the presence of DMDS and the absence of DMDS. Pd-S bond strength was determined by temperature-programmed reduction (H_2S-TPR) profiles. The results show that desorption of H_2S from sulfided Pd/TiO_2 occurs at 553 K, whereas desorption of H_2S from sulfided Pd/Al_2O_3 requires a higher temperature (773 K), indicating that the Pd-S bond in Pd/TiO_2 is significantly weaker than that in Pd/Al_2O_3. Consequently, in Pd/TiO_2 clean surfaces of Pd metals are highly exposed as active sites for the naphthalene hydrogenation in the presence of dimethyldisulfide.
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