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Effect of Competitive Adsorbates on the Catalytic Activity of [email protected] in the Oxidation of NMST to NMSBA

Authors
  • Liu, Hua-jie1
  • Fang, Zhou-wen1
  • Zhou, Xin-zhi1
  • Long, Xiang-li1
  • 1 East China University of Science and Technology, Meilong Road 130, 200237 , (China)
Type
Published Article
Journal
International Journal of Chemical Reactor Engineering
Publisher
De Gruyter
Publication Date
Feb 29, 2020
Volume
18
Issue
3
Identifiers
DOI: 10.1515/ijcre-2019-0154
Source
De Gruyter
Keywords
License
Yellow

Abstract

The effect of competitive adsorption on the catalytic performance of [email protected] catalyst for producing 2-nitro-4-methylsulfonylbenzoic acid (NMSBA) from the oxidation of 2-nitro-4- methylsulfonyltoluene (NMST) by oxygen in acetic acid has been investigated. Six kinds of acids were added into the impregnation solution as competitive adsorbates for phosphomolybdic acid in the preparation of [email protected] catalyst. H2SO4, HCl, HNO3, CH3COOH and H2C2O4 are beneficial to improving the catalytic activity of the [email protected] catalyst. The corresponding optimum impregnation concentrations for H2SO4, HCl, HNO3, CH3COOH and H2C2O4 are 0.4, 0.3, 0.3, 1.0 and 0.3 mol L−1, respectively. The addition of H3PO4 exerts a negative effect on the catalytic capability of [email protected] catalyst. The results of TEM characterization show that good dispersion of H3PMo12O40 on the surface of the [email protected] catalyst is beneficial to ameliorating the catalytic ability of [email protected] catalyst in the production of NMSBA from NMST by oxygen in acetic acid. The results of NH3-TPD indicate that the acidity of the [email protected] also favors the improvement of the catalytic capability of [email protected] in the oxidation of NMST to NMSBA.

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