凹凸棒粘土负载WO_3催化环戊烯环氧化

以钨酸钠为钨源,凹凸棒粘土(AT)为载体,采用浸渍法制备了凹凸棒粘土负载WO_3(WO_3/AT)催化剂,采用FT-IR和XRD对其进行了表征。以30%H_2O_2为氧源,叔丁醇为溶剂,研究了凹凸棒粘土负载WO_3在环戊烯环氧化反应中的催化性能。结果表明,WO_3与凹凸棒粘土载体中的金属离子(Mg~(2+)、Al~(3+)和Fe~(3+))之间有强的相互作用,形成了M~+—O—W键。反应的最佳工艺条件为:反应温度308 K,反应时间24 h,催化剂用量1.5 g,WO_3负载质量分数40%,催化剂焙烧温度823 K,焙烧时间3 h。在此条件下,环戊烯环氧化物收率为42.2%,环戊烯转化率为96.3%。

Epoxidation of cyclopentene catalyzed by attapulgite-supported WO3

Attapulgite supported WO3 （WO3/AT） catalyst was prepared using impregnation method, using sodium tungstate as the precursor and attapulgite clay （AT） as the carrier, and its structure was characterized by FT-IR and XRD. Catalytic behaviors of WO3/AT for epoxidation of eyelopentene were investigated using 30% H2O2 as the oxidant and tert-butyl alcohol as the solvent. The experimental results showed that there was a strong interaction between WO3 and metal cations （Mg^2＋ , Al3^3＋ and Fe^3 ＋ ） in the attapulgite carrier, forming M ^＋ -O-W bond. The optimum condition for the reaction and catalyst preparation was as follows： reaction temperature 308 K, reaction time 24 h, dosage of the catalyst 1.5 g,loadings of WO3 =40% ,catalyst calcination temperature 823 K, catalyst calcination time 3 h. 1, 2-epexycyelopentane （CPO） yield of 42.2% and cyclopentene （CPE） conversion of 96.3% were attained under the optimum condition.