过氧化氢氧化苯酚铜锰复合氧化物催化剂的制备

采用固相法制备了新型催化剂铜锰复合氧化物催化剂。利用高效液相色谱法对苯酚过氧化氢氧化反应产物进行分析,以苯酚转化率和苯二酚收率为评价指标,对催化剂进行了评价。结果表明,催化剂性能随铜与锰物质的量比、焙烧温度、焙烧时间和研磨时间等因素的增大呈先升高再降低的趋势,并与络合剂的还原性有关。确定最佳工艺条件为:室温下,按锰与铜物质的量比1:2将Cu_2(OH)_2CO_3、MnCO_3和适量H_2C_2O_4·2H_2O混匀,置于研钵匀速研磨10 min,马弗炉400℃焙烧2 h。最佳条件下,苯酚转化率为63.7%,苯二酚收率为59.1%。

Preparation of copper-manganese composite oxide catalysts for phenol oxidation by hydrogen peroxide

The novel copper-manganese composite oxide catalysts were prepared by the solid reaction method. The catalytic performance of the catalysts was evaluated using phenol oxidation by hydrogen peroxide as the probe reaction, phenol conversion and diphenol yield as the evaluation index, and HPLC chromatography as the analysis method. The results showed that the catalytic properties of the catalyst were enhanced and then reduced with the increase of molar ratio of copper to manganese, calcination temperature,calcination time and grinding time, and influenced by reducing properties of the complexing agent. The optimum condition for the catalyst preparation was that Cu2 （OH） 2 CO3, MnCO3 （ molar ratio of copper to manganese 1： 2） and proper H2C2O4 · 2H2O were put into a mortar and grinded at room temperature for 10 min, and then calcined at 400 ℃ for 2 h. Under the optimum condition, phenol conversion and diphenol yield reached 63.7 % and 59.1% , respectively.