CuNaX催化苯甲醇无溶剂氧化合成苯甲醛

通过简单离子交换法制备了不同铜含量的CuNaX催化剂,研究了催化剂在无溶剂条件下用70%叔丁基过氧化氢(TBHP)氧化苯甲醇合成苯甲醛反应中的催化性能.实验结果表明,随着铜含量的增加,苯甲醛的收率呈先增大后减小的趋势.当铜含量为10.4%时,苯甲醛的收率最高.在催化剂用量100mg、n(TBHP)/n(苯甲醇)=1.3、反应温度70℃、反应时间6h的优化条件下,苯甲醛的产率达34.7%.且该催化剂重复使用3次之后,苯甲醛的收率和选择性无明显下降.较高的铜含量将使NaX分子筛的结构发生部分破坏,导致苯甲醛的收率下降.

Solvent-Free Oxidation of Benzyl Alcohol to Benzaldehyde over CuNaX Catalyst

A series of CuNaX catalysts with different Cu content were synthesized by a simple ion-exchange method.The catalytic performance of CuNaX for solvent-free oxidation of benzyl alcohol using tert-butyl hydroperoxide(TBHP)as the oxidant was studied.With an increase of Cu-containing,the yield of benzaldehyde firstly increased and then decreased.Under an optimized reaction condition of catalyst 100 mg,n(TBHP)/n(benzyl alcohol)=1.3,T=70 ℃,and reaction time 6h,up to 34.7% of benzaldehyde yield could be achieved over CuNaX with a Cu-containing of 10.4%.The catalyst could be recycled for 3runs without appreciable loss of its activity.A higher Cu-containing would lead to a partial destruction of original texture of NaX and a lower benzyldehyde yield could be seen.