Ammoxidation of 2-methyl pyrazine to 2-cyano pyrazine on MoO 3 /FePO 4 catalysts

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• 作者：NAGARAJU PASUPULETY ; HAFEDH DRISS ; YAHIA ABOBAKOR ALHAMED…
• 关键词：Iron phosphate ; molybdenum ; ammoxidation ; 2 ; methyl pyrazine.
• 刊名：Journal of Chemical Sciences
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：128
• 期：2
• 页码：227-234
• 全文大小：2,232 KB
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• 作者单位：NAGARAJU PASUPULETY (1)
  HAFEDH DRISS (2)
  YAHIA ABOBAKOR ALHAMED (1) (2)
  ABDULRAHIM AHMED ALZAHRANI (1) (2)
  MUHAMMAD A DAOUS (1) (2)
  LACHEZAR PETROV (1)
  N LINGAIAH (3)
  P S SAI PRASAD (3)
  
  1. SABIC Chair of Catalysis, King Abdulaziz University, P.O. Box 80204, Jeddah, 21589, Saudi Arabia
  2. Chemical and Materials Engineering Department, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah, 21589, Saudi Arabia
  3. Inorganic & Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad, 500 007, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chemistry
  
• 出版者：Springer India
• ISSN：0973-7103

文摘

The objective of this work is to understand the influence of small amount of Mo=O (1, 3 and 5 wt.% MoO₃) impregnated on FePO₄ and its resultant effect on the acidity was studied for the ammoxidation of 2-methyl pyrazine (2-MP) to 2-cyano pyrazine (2-CP) in the temperature range of 380–420 ∘C. The Mo/FeP catalyst characteristics were evaluated by XRD, HAADF-EDS, TPR and NH₃-TPD techniques. Primarily, quartz-type XRD phase was observed for the iron phosphate (FeP). The Mo/FeP exhibits MoO₃ and quartz-type iron phosphate phase. The interface between Mo particles (20 nm) and FeP was clearly established by HR-TEM in 3Mo/FeP. Furthermore, the average atomic composition revealed by HAADF/EDS for 3Mo/FeP as Fe 30.0%, P 40.0% and Mo 1.6% with Fe/Mo surface XPS ratio 6. The greater 2-CP yield of 68.0% on 3Mo/FeP was attributed to enhanced, moderate acid sites coming from MoO₃ and cooperation between Mo and FeP at the interface in terms of oxygen and electron transfer to the reactant (2-MP).