Abstract：The catalytic oxidation of o-xylene to 2-methylbenzaldehyde with oxygen in fix-bed reactor had been studied using Mg, K or Cs modified VOx/SiO2 as catalysts. Effects of catalyst, temperature, molar ratio of oxygen to substrate and space velocity of o-xylene on the reaction were systematically investigated. The results showed that the surface basicity of the catalyst benefited for the selectivity of 2-methylbenzaldehyde. The proper process conditions were optimized: using K-VOx/SiO2 as the catalyst, reaction temperature of 400 ℃, mole ratio of oxygen to substrate of 4.5, and liquid hourly space velocity of 0.36 h-1. Under such optimized process conditions, the conversion of o-xylene and the selectivity of 2-methylbenzaldehyde reached 10.5% and 98%, respectively. The catalytic process had good stability and showed good industrial application prospect.
KONG Zhenji,ZHAO Chunsheng,SUN Zhonghua et al. Process for the Oxidation of o-Xylene to 2-Methylbenzaldehyde in Gas-Phase[J]. Chemical Reaction Engineering and Technology, 2023, 39(2): 134-139.
