草酸铜-草酸镍催化工业双戊烯脱氢合成对伞花烃的研究

Study of p-Cymene Synthesis by Catalytic Dehydrogenation of Industrial Dipentene on Copper-nickel Oxalate

研究了并流共沉淀法制备的草酸铜-草酸镍催化剂在工业双戊烯脱氢合成对伞花烃气相反应中的催化性能。主要考察了催化剂铜镍摩尔比、还原温度、催化剂固定床的布置方式和脱氢次数对反应结果的影响。采用TG-DTA、FTIR测试手段对催化剂的热分解过程及其结构进行了表征。结果表明,草酸铜-草酸镍制备简单,在催化合成对伞花烃的气相反应中表现出了良好的活性。实验得到最佳合成条件为:催化剂铜镍摩尔比为1∶3,还原温度为500°C,催化剂床层采用竖向布置,经二次脱氢反应基本完成,在最佳条件下制得产物中对伞花烃含量最高为79.38%。

The catalytic performance of copper-nickel oxalate catalysts prepared by concurrent coprecipitation was studied in the gas-phase reaction of p-cymene synthesis by dehydrogenation of industrial dipentene. The influences of molar ratio of copper to nickel, reduction temperature, arrangement mode of catalysts fixed-bed and dehydrogenation times on reaction were investigated. TG- DTA and FT IR were used to exam the thermal decomposition process and structure of catalysts. The results revealed that the catalysts prepared by a simple method showed high activity for p-cymene synthesis. The optimal synthesis conditions obtained are： molar ratio of copper in nickel of catalyst is 1 ： 3, reduction temperature 500℃, the catalysts bed is of vertical arrangement mode, the reaction completes almost after 2 times dehydrogenation. The highest yield of 79. 38% is gained under the best conditions.