5A分子筛负载CoCl_2催化对二甲苯的分子氧氧化

Oxidation of p-xylene with molecular oxygen catalyzed by CoCl_2 supported on 5A zeolite

5A分子筛与CoCl2溶液混合，蒸发至干，150℃干燥（10—12）h，水洗，干燥。洗脱液的光度分析表明，载体对CoCl2存在饱和量。催化活性测定表明，在对二甲苯用量15．0mmol、催化剂用量80mg和添加对甲基苯甲酸0．50mmol，95℃反应10h，对二甲苯转化率为56．44％，对甲基苯甲酸、对甲基苯甲醛和对甲基苯甲醇的收率分别为44．82％、5．80和2．75％。考察了催化剂的5次使用活性，结果表明，使用寿命较好。

5A zeolite was mixed with CoCl2 solution, heated to vaporize water, dried at 150 ℃ for （8 - 10） h, washed and dried again. Photometric analysis of the eluted CoCl2 solution indicated that, for 5A zeolite, there were a saturating capacity for loading of CoC12. p-Xylene conversion of 56.44%, p-toluic acid yield of 44.82%, p-tolualdehyde yield of 5.80% and p-toluic alcohol yield of 2.75% were obtained under the following condition ： n （p-xylene） = 15.0 mmol, m （catalyst） = 80 mg, n （p-toluic acid） = 0.50 retool, reaction at 95 ℃ for 10 h. The catalyst was repeated used for five times.