WO3选择性催化氧化苯甲醇制苯甲醛

摘要

钨酸经400℃焙烧3 h后得到的三氧化钨催化剂可有效地催化氧化苯甲醇生成苯甲醛。 WO3、苯甲醇和H2O2的摩尔比为1∶100∶147，反应温度为60℃，反应时间为3 h，苯甲醇的转化率为87.5%，苯甲醛的选择性为96.8%。WO3催化剂经重复使用5次后仍然保持较好的催化活性。通过对反应前后催化剂的X-射线衍射分析发现，反应后的催化剂主体相保持不变，但生成一部分水合氧化物，推断反应过程中催化活性物种为过氧化钨酸。%Benzyl alcohol can be efficiently catalytically oxidized by tungsten trioxide catalyst obtained by calcination of tungstic acid at 400℃for 3 h to produce benzaldehyde. Under the following conditions, molar ratio of WO3∶benzyl alcohol∶H2O2 is 1∶100∶147, 60 ℃ reaction temperature and 3 h reaction time, the conversion rate of benzyl alcohol is 87.5 % with yield of benzaldehyde reaching 84.7 %. The catalytic activity of catalyst is still maintained after 5 times reuse. The comparison of XRD patterns of the fresh and reused catalysts revealed that the main phase of reused catalyst remains unchanged with some hydrous oxide generated. It is inferred that the catalytic active species is tungstic acid peroxide.