5A分子筛负载COCl_2结构表征及其催化对二甲苯氧化反应性能  

Characterization of 5A-zeolite-supported CoCl_2 and its catalytic behaviors for the oxidation of p-xylene

作　　者：廖永志[1] 杨坤国[2] 

机构地区：[1]广西水产研究所,广西南宁530021 [2]广西师范大学化学化工学院,广西桂林541004

出　　处：《工业催化》2010年第11期41-46,共6页Industrial Catalysis

摘　　要：将5A分子筛与CoCl_2溶液混合蒸发至干,150℃干燥(8～12)h,水洗,干燥。洗脱液光度分析表明,载体对CoCl_2存在饱和量,且随干燥温度的变化而改变。XRD、IR及激光拉曼分析显示,催化剂与载体存在强相互作用。干燥温度过低,造成催化活性组分在反应过程中的脱落;干燥温度过高,导致载体本身结构的改变而降低稳定性。将15.0 mmol对二甲苯、0.50 mmol对甲基苯甲酸和80 mg催化剂混合,常压、95℃反应10 h,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%,考察了催化剂的使用寿命,并对结构进行了表征。5A zeolite was mixed with CoC12 solution, then heated to vaporize water, dried at 150 ℃ for （8-10） h, washed and dried again. Photometric analysis of the eluted CoC12 solution indicated that there existed a saturating capacity of 5A zeolite for loadings of CoCI2, which slightly varied with drying temperature. XRD, IR and Raman spectroscopy results indicated that there existed strong interaction between the catalyst and the support. Excessively low drying temperature resulted in fall-off of the active component during reaction; Excessively high drying temperature led to structural change of the support and lowered the stability, p-Xylene conversion of 56.44% and p-toluie acid yield of 44.82%, p-tolualdehyde yield of 5.80%, p-toluic alcohol yield of 2.75% were obtained under the following condition： 15.0 mmol p-xylene, 0.50 mmol p-toluic acid, 80 mg catalyst, atmospheric pressure, 95 ℃, reaction for 10 h. Service cycle of the catalyst was investigated and its structure characterized.

关 键 词：催化化学 5A分子筛 负载CoCl2 对二甲苯 对甲基苯甲酸 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]