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NMSBA produced from NMST under the catalysis of supported H 3 PW 12 O 40 and Co/Mn/Br catalytic system
Author(s) -
He Heng,
Fang ZhouWen,
Zhang Chao,
Long XiangLi
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23085
Subject(s) - catalysis , phosphotungstic acid , oxidizing agent , chemistry , yield (engineering) , nitric acid , cobalt , oxygen , calcination , nitrogen , inorganic chemistry , molar ratio , nuclear chemistry , organic chemistry , materials science , metallurgy
The commercial production of 2‐nitro‐4‐methylsulphonylbenzoic acid (NMSBA) is oxidizing 2‐nitro‐4‐methylsulphonyltoluene (NMST) by nitric acid catalyzed with V 2 O 5 . A heterogeneous catalytic system composed of phosphotungstic acid supported on activated carbon, Co, Mn, and Br is used to catalyze the production of NMSBA from NMST by oxygen in this paper. The experiments show that the heterogeneous catalytic system composed of HPW@C, Co, Mn, and Br is capable of speeding up the oxidation of NMST to NMSBA by oxygen and acquiring a higher NMST oxidation rate and NMSBA yield than the homogeneous H 3 PW 12 O 40 /Co/Mn/Br catalytic system. The best HPW@C catalyst is obtained by supporting 0.0125 g/g H 3 PW 12 O 40 on carbon followed by being calcined at 220 °C for 4 h under nitrogen atmosphere. The best heterogeneous catalytic system consists of 2.38 × 10 −3 g/g HPW@C, 925 ppm Br, 236 ppm cobalt, and a Mn/Co molar ratio of 2.5. The usage of phosphotungstic acid in the heterogeneous system is diminished substantially.