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Wuhan University Journal of Natural Sciences

, Volume 24, Issue 1, pp 23–29 | Cite as

Influence of V/P Ratio on the Catalytic Performance of VPO/SiO2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes

  • Yanling Dong
  • Longlong Xu
  • Zhenguo Zhang
  • Wenhui Liu
  • Xiongjian Li
  • Yalan ZhongEmail author
  • Chi Huang
Chemistry
  • 5 Downloads

Abstract

A series of vanadium phosphate oxide (VPO) catalysts supported on silica (VPO/SiO2) with various mole ratios of V/P (nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by ammoxidation reactions of several kinds of chloro-substituted toluenes (CT) in a fixed-bed reactor. The catalyst presented the best performance when nV:nP is 1:1.6. The prepared catalysts were characterized by N2 adsorption, hydrogen temperature programmed reduction (TPR) and ammonia temperature programmed desorption (TPD) and etc. The results reveal that P can decrease the bonding energy of V=O and increase the mobility of lattice oxygen which was beneficial for the improvement of the catalysts, while too much P can greatly decrease the average oxidation number of V which leads to deactivation of the catalysts. The surface acidity of the VPO/SiO2 catalysts is affected by nV:nP and the catalyst had the highest surface acidity when nV:nP is 1:1.6. The selectivity of catalysts is proportional to the surface acidity when nV:nP is lower than 1:3.0.

Key words

ammoxidation VPO/SiO2 catalyst substituted toluenes substituted benzonitriles 

CLC number

O 625.67 

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Copyright information

© Wuhan University and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yanling Dong
    • 1
  • Longlong Xu
    • 2
  • Zhenguo Zhang
    • 2
  • Wenhui Liu
    • 3
  • Xiongjian Li
    • 4
  • Yalan Zhong
    • 4
    Email author
  • Chi Huang
    • 4
  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyHubeiChina
  2. 2.Tianhua Chemical Branch, Xi’an Sunward Aeromat Co., Ltd.ShaanxiChina
  3. 3.Sanjiang Chemical Factory of CSSGHubeiChina
  4. 4.College of Chemistry and Molecular SciencesWuhan UniversityHubeiChina

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