摘要
采用共沉淀法制备了一系列复合金属氧化物催化剂,并考察了其对尿素与1,2-丙二醇(PG)合成碳酸丙烯酯(PC)反应的催化性能,结果表明,MgO-Al2O3催化活性最高,PC收率为79.2%.优化了MgO-Al2O3的制备条件:以硝酸镁和硝酸铝为前驱体,Mg/Al摩尔比3:1,沉淀剂氢氧化钠和碳酸钠的摩尔比3:1,焙烧温度400℃,老化温度为70℃.此条件制备的MgO-Al2O3催化剂上,PC收率为81.0%.CO2-TPD和BET分析表明催化剂的比表面积是影响其活性的主要因素,XRD和TG-DTA分析表明400℃时制备MgO-Al2O3的前驱体可完全分解.
A series of compound metal oxide catalysts were prepared by co-precipitation method,and their catalytic behavior was investigated in the reaction of synthesizing propylene carbonate（PC） from urea and 1,2-propylene glycol（PG）.MgO-Al2O3 showed the highest activity and PC yield amounts to 79.2 %.The suitable preparation conditions for MgO-Al2O3 were as follows：Mg NO3 2 6H2O and Al NO3 3 9H2O as the precursors,molar ratio of Mg/Al 3：1,（NaOH：Na2CO3=3：1） as the precipitator,calcination temperature 400 ℃,aging temperature 70 ℃.The yield of PC over MgOAl2O3 thus prepared was 81.0 %.CO2-TPD and BET characterization results show that BET surface is the main factor influencing the catalytic atcivity,XRD and TG-DTA characterization results show that the precursors for preparing MgOAl2O3 decomposed completely at 400 ℃.
出处
《河北工业大学学报》
CAS
北大核心
2010年第2期26-30,共5页
Journal of Hebei University of Technology
基金
河北省科学技术研究与发展计划项目(072421107D)
关键词
尿素
1
2-丙二醇
碳酸丙烯酯
镁铝氧化物
urea
1
2-propylene glycol
propylene carbonate
magnesium-aluminum oxide catalyst
