Nanosize Gold Promoted Vanadium Oxide Catalysts for Ammoxidation of 2-Methylpyrazine to 2-Cyanopyrazine

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• 作者：A. Alshammari ; V. N. Kalevaru ; N. Dhachapally ; A. K?ckritz…
• 关键词：Ammoxidation ; 2 ; Methylpyrazine ; 2 ; Cyanopyrazine ; Gold nano particles ; Vanadia catalysts
• 刊名：Topics in Catalysis
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：58
• 期：14-17
• 页码：1062-1068
• 全文大小：1,007 KB
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• 作者单位：A. Alshammari (1)
  V. N. Kalevaru (2)
  N. Dhachapally (2)
  A. K?ckritz (2)
  A. Bagabas (1)
  A. Martin (2)
  
  1. Materials Science Research Institute, King Abdulaziz City for Science and Technology, King Abdullah Road, P.O. Box 6086, Riyadh, 11442, Saudi Arabia
  2. Leibniz-Institut für Katalyse e.V. an der Universit?t Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
  
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028

文摘

Ammoxidation of 2-methylpyrazine to 2-cyanopyrazine has been carried out using nano sized gold promoted vanadia catalysts in the temperature range from 360 to 400 °C at atmospheric pressure. Three different types of metal oxides [e.g. CaO, Al₂O₃ and TiO₂ (anatase)] with varying surface areas were used as catalyst supports. The catalysts were prepared by three-step impregnation method and characterised by various techniques. Characterisation results showed the formation of nano-sized gold particles in the range from 2 to 5 nm. However, their size and morphology strongly depends upon the nature of support applied. Catalytic results revealed that Au is an efficient promoter for vanadia catalysts in improving the yield of the desired product, 2-cyanopyrazine, due to synergistic effect between the Au and VO_x species. Among all, V₂O₅–Au/TiO₂ exhibited the best performance giving over 75 % conversion of 2-methylpyrazine and close to 50 % yield of CP. Keywords Ammoxidation 2-Methylpyrazine 2-Cyanopyrazine Gold nano particles Vanadia catalysts