Cu-Al交联黏土催化剂的制备及其苯直接羟基化的催化性能

通过直接向稀释的黏土悬浮液中引入Cu-Al交联剂，制备了不同n(Cu)/n(Cu+Al)的Cu-Al交联黏土催化剂。运用XRD、BET、FT-IR、TG、H₂-TPR、SEM等手段表征所制备的Cu-Al交联黏土催化剂，并将其用于催化苯- H₂O₂直接羟基化制备苯酚反应中，考察了溶剂种类、反应时间、反应温度、催化剂用量、n(H₂O₂)/n(benzene)对催化剂活性的影响。结果表明，Cu-Al交联黏土催化剂在苯直接羟基化反应中具有良好的催化活性，在最佳反应条件下可使苯转化率达64.2%，苯酚选择性达85.1%，苯酚收率达54.6%，优于其他含铜催化剂的催化效果。

Preparation of Cu–Al Pillared Clay Catalyst and Its Catalytic Performance in Benzen Direct Hydroxylation to Phenol

The Cu-Al pillared clay catalysts with different n(Cu)/n(Cu+Al) were prepared by direct introduction of Cu-Al pillaring agent into the dilute clay suspension, and characterized by XRD, BET, FT-IR, TG, H₂-TPR and SEM methods. The catalytic performance of Cu-Al pillared clay catalyst in benzene direct hydroxylation to phenol was investigated. The influences of various reaction parameters, such as n(Cu)/n(Cu+Al), solvent type, reaction temperature, reaction time, amount of catalyst, n(H₂O₂)/n(Benzene), on the catalytic activity of the catalyst were studied. The results showed that Cu-Al pillared clay catalyst exhibited high catalytic activity in benzene direct hydroxylation. Under the optimal reaction conditions, benzene conversion of 64.2%, phenol selectivity of 85.1% and phenol yield of 54.6% were obtained, which was higher than those obtained from the reaction catalyzed by other reported Cu catalysts.