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Hydrogenation activity of Tungsten Carbides Preopared by CVD Method

Research Project

Project/Area Number 08455376
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 触媒・化学プロセス
Research InstitutionKAGOSHIMA UNIVERSITY

Principal Investigator

TAKAHASHI Takeshige  Kagoshima University Engineering, Professor, 工学部, 教授 (20041543)

Co-Investigator(Kenkyū-buntansha) KAI Takami  Kagoshima University, Engineering, Associate Professor, 工学部, 助教授 (00177312)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1996: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsTungsten carbide / CVD preparation method / Hydrogenation activity / Solid Acid Property / タングステン カーバイド / シクロへキゼンの反応 / 個体酸機能 / 水素化機能 / 加熱処理の影響 / 炭化水素異性化活性 / シクロヘキセンの反応 / 固体酸機能 / 強酸点 / WC / W_2C比 / 組成・生成量制御 / シクロヘキセン水素化活性 / 酸強度分布
Research Abstract

The preparations of tungsten carbide by CVD method and the application of the carbides to hydrogenation catalyst have been studied in the present project. The tungsten hexafluoride reacted with cyclo-hydrocarbon on an activated carbon surface resulted in tungsten carbides with high surface area. Main substances in the carbides were WC and W_2C.The former was effective for hydrocracking of n-butane. The turnover frequency of the carbides for the hydrocracking was almost the same as that of a platinum catalyst supported on alumina. However, the reaction rate calculated from unit catalyst mass of the carbide catalyst was smaller than that of the platinum catalyst due to the low concentration of effective species on the carbides.
The catalytic activity of the tungsten carbide for hydrogenation of ethylene was almost the same as those of platinum catalyst and nickel catalyst. The reaction rate of the hydrogenation over platinum and nickel catalysts decreased with reaction temperature higher than 220"*"C, but the catalytic activity of the carbides increased up to 350"*"C.This is very unique property of the tungsten carbides. The reaction of cyclohexene was carried out over the carbides to elucidate the effect of preparation conditions on the conversion of cyclohexene and the selectivity of the products. The main product for the reaction was 1-methyl-cyclopentene produced by isomerization of cyclohexene. The isomerization indicated that the carbide was solid acid catalyst. When the carbides was treated in hydrogen atmosphere at 700"*"C, it was found that the hydrogenation activity was gradually recovered with treating period. This result suggested that a tungsten oxide simultaneously produced with tungsten carbide showed the solid acid property.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] T.Takahashi, T.Kai S.Naganosono: "Effect of Carbon Source on Hydrogenation Activity of Tungsten Carbide Prepared by CVD Method" Catalysis Letters. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Takahashi, Y.Wada T.Kai: "Activity of Tungsten Carbides Prepared by CVD Method" Micro porous and Mesoporous Materials. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Takahashi, S.Nakanosono and T.Kai: ""Effect of Carbon Source on Hydrogenation Activity of Tungsten Carbide Preapred by CVD Method."" Catalysis Letters. (in print).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Takahashi, Y.Wada and T.Kai: ""Activity of Tungsten Carbide Prepared by CVD method"" Microporous and Mesoporous Materials. (in print).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 高橋武重,甲斐敬美: "Effect of lteat Treatment on Catalytic Activity of WC Prepared by CVD Method" J.Micro and Meso porous Materials. (印刷中).

    • Related Report
      1998 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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