制备条件对钯/陶瓷膜催化剂性能的影响

Effects of Preparation Conditions on Performance of Pd/Ceramic Membrane Catalyst

将钯纳米颗粒负载于陶瓷膜表面制备钯/陶瓷膜催化剂,并用于对硝基苯酚催化加氢反应中,考察了陶瓷膜孔径,硅烷偶联剂KH550溶剂及其浓度和改性时间,钯盐浸渍浓度、温度及时间以及还原温度对膜催化剂催化性能的影响。结果表明,采用孔径为200 nm的氧化铝陶瓷膜,在6 g/L的硅烷偶联剂KH550溶液中浸渍48 h,然后在40℃的浓度为0.030 mol/L乙酸钯溶液中浸渍20 h,最后采用水合肼在0℃还原30 min,得到的钯/陶瓷膜催化剂在对硝基苯酚催化加氢反应中显示了较好的催化性能,其加氢速率达15.5 mol/(h.m2)。

The nano-sized palladium particles were immobilized on the surface of ceramic membrane to prepare Pd/eeramic membrane catalysts, which were used in the hydrogenation ofp-nitrophenol. The effects of pore size of ceramic membrane, concentration and modification time of solvent silane coupling agent KH550, concentration of palladium acetate impregnation, impregnation temperature and time, and reduction temperature on the Pd/ceramic membrane catalyst were investigated systematically. The results sho,,ved that the performance of catalyst for hydrogenation of p-nitrophenol exhibited better and the hydrogenation rate could reach 15.5 mol/（h＇m^2） under the conditions of pore size of alumina ceramic membrane 200 nm, concentration of silane coupling agent KH550 6 g/L, modification time of 48 h, concentration of palladium acetate impregnation 0.03 mol/L, impregnation temperature 40℃, impregnation time 20 h, reduction temperature of 0℃ and reduction time of 30 rain.