CAJ | 학술논문

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,沉淀荆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.
채용공침정법제비료일계렬복합금속양화물최화제,병고찰료기대뇨소여1,2-병이순(PG)합성탄산병희지(PC)반응적최화성능,결과표명,MgO-Al2O3,최화활성최고,PC수솔위79.2％.우화료MgO-Al2O3,적제비조건:이초산미화초산려위전구체,Mg／Al마이비3:1,침정형경양화납화탄산납적마이비3:1,배소온도400℃,노화온도위70℃.차조건제비적MgO-Al2O3최화제상,PC수솔위81.0％.CO2-TPD화BET분석표명최화제적비표면적시영향기활성적주요인소,XRD화TG-DTA분석표명400℃시제비MgO-Al2O3적전구체가완전분해.
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 o fMg/Al 3 : 1, (NaOH : Na2CO3=3 : 1) as the precipitator, calcination temperature 400℃, aging temperature 70℃. The yield of PC over MgO-A12O3 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 MgO-A12O3 decomposed completely at 400℃.