模板法制备CaMg_(x)O_(x+1)催化剂  

PREPARATION OF CaMg_(x)O_(x+1)CATALYST BY TEMPLATE METHOD

作　　者：李晓红 苏钨盼 樊紫艳 靳福全 Li Xiaohong;Su Wupan;Fan Ziyan;Jin Fuquan(Department of Chemistry and Chemical Engineering,Taiyuan Institute of Technology,Taiyuan 030008)

机构地区：[1]太原工业学院化学与化工系,太原030008

出　　处：《石油炼制与化工》2024年第12期53-58,共6页Petroleum Processing and Petrochemicals

基　　金：太原工业学院大学生创新训练项目(GK2022075)。

摘　　要：以杨木屑为模板剂,用钙、镁乙酸盐混合水溶液对其浸渍,通过干燥、焙烧得到CaMg_(x)O_(x+1)催化剂,并将其用于蓖麻油与甲醇的酯交换反应,以蓖麻油转化率评定催化剂活性。采用单因素试验探究了催化剂制备条件对催化剂活性的影响,得到CaMg_(x)O_(x+1)催化剂制备的最佳条件为:钙镁物质的量比1∶5、焙烧温度900℃、焙烧时间7 h。对催化剂及其前体进行热重分析、X射线衍射和扫描电镜分析。结果表明:当焙烧温度超过700℃时,催化剂前体的质量随着温度升高而缓慢下降;当焙烧温度超过900℃后,催化剂前体质量几乎不再变化;CaMg_(x)O_(x+1)催化剂基本保留了模板杨木屑的晶相结构,其中大量为无定形或微晶体形式的MgO、CaO或其复合物,少量为MgO晶体。Using poplar sawdust as a template,CaMg_(x)O_(x+1)catalyst was obtained by impregnating aspen sawdust with a mixed aqueous solution of calcium and magnesium acetate,drying and calcination,and then used in the transesterification of castor oil and methanol,and the catalyst activity was evaluated based on the conversion rate of castor oil.The influence of catalyst preparation conditions on the activity of the catalyst was investigated by single factor experiments.The optimal conditions for preparing CaMg_(x)O_(x+1)catalyst were as follows:a Ca/Mg molar ratio of 1∶5,a calcination temperature of 900℃and a calcination time of 7 h.The catalysts and their precursors were analyzed by thermogravimetric(TG),X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results showed that the mass of the catalyst precursor decreased with the increase of the calcination temperature over 700℃,while the mass of catalyst precursor hardly changed with temperature when the temperature exceeded 900℃.The CaMg_(x)O_(x+1)catalyst basically retained the crystal structure of the template poplar sawdust,with a large amount of amorphous or microcrystalline substances such as MgO,CaO or their complexes,and a small amount of crystalline substances such as MgO.

关 键 词：模板剂 杨木屑 催化剂 蓖麻油 甲醇 酯交换反应 

分 类 号：TQ426[化学工程]