采用共沉淀法制备Mg-Zn复合氧化物催化剂，着重考察了焙烧温度对催化剂结构和催化性能的影响，并将其用于催化大豆油甘油解合成单甘酯（MAG）。利用XRD、BET、SEM和HRTEM等分析手段对Mg-Zn复合氧化物催化剂进行表征。不同焙烧温度下，Mg-Zn复合氧化物催化剂碱强度H＿在15.0~17.2范围时，催化剂MZ800碱量最大，碱强度是影响催化剂活性的主要因素。由HRTEM分析发现，800℃时催化剂出现六边形结构，这是由于Zn-Mg-O晶格的生成。且Mg-Zn复合氧化物催化剂中ZnO（101）处晶面间距（0.024 2 nm）略小于标准卡片六方晶相ZnO（101）晶面间距（0.248 nm）。结果表明，适宜的焙烧温度为800℃，此时大豆油转化率为96.5%，MAG收率为53.4%。

Mg-Zn mixed oxide catalyst is prepared by co-precipitation method.Study is focused on the effects of different calcination temperatures on the structure and catalytic performance of the catalyst.The catalyst is used to catalyze the synthesis of monoglyceride (MAG) from glycerol and soybean oil.It is characterized by XRD,BET,SEM and HRTEM.At different calcination temperatures,the basicity amount of MZ800 is the largest when the basic strength H- of the Mg-Zn composite oxide catalyst is in the range of 15.0-17.2.Basic strength is the main factor affecting the activity of the catalyst.It is found through HRTEM analysis that the catalyst appears a hexagonal structure at 800℃,which may be contributed to the formation of Zn-Mg-O lattice.Moreover,the interplanar spacing (0.024 2 nm) at ZnO (101) in the Mg-Zn mixed oxide catalyst is slightly smaller than that hexagonal phase ZnO (101) plane spacing (0.248 nm) in the standard card.The results show that the suitable calcination temperature is at 800℃.Over the catalyst that has been calcined at 800℃,the conversion rate of soybean oil can reach 96.5% and MAG yield can reach 53.4%.

冯娟(1992-),女,硕士研究生,研究方向为生物质转换,2532362774@qq.com