担载镍催化剂上乙炔与甲酸甲酯加氢酯化合成丙烯酸甲酯:担载量和焙烧温度的影响(英文)

以ＮｉＯ担载量为０．０８ｗｔ％～１８．７ｗｔ％及焙烧温度为６２３ Ｋ～８７３ Ｋ的ＮｉＯ／Ａｌ２Ｏ３催化剂进行乙炔与甲酸甲酯的加氢酯化反应，并结合ＴＰＲ、ＸＰＳ、ＸＲＤ和ＢＥＴ技术对催化剂进行表征。催化剂在制备过程中，镍离子与载体氧化铝间的相互作用产生两种不同的镍物种，ＮｉＯ晶相和ＮｉＡｌ２Ｏ４类物种，它们间的比例随担载量及焙烧温度而异，因而表现出其对乙炔与甲酸甲酯加氢酯化不同的反应性能。实验结果表明，在７７３ Ｋ焙烧的１０Ｗｔ％ＮｉＯ／Ａｌ_２Ｏ_３最适合乙炔与甲酸甲酯的加氢酯化反应。

HYDROESTERIFICATION OF ACETYLENE WITH METHYL FORMATE TO METHYL ACRYLATE OVER A NiO/Al_2O_3 CATALYST: EFFECTS OF NiO LOADING AND CALCINATION TEMPERATURE

Hydroesterification of acetylene with methyl formate (MF) was studied over a series of nickel-supported catalysts with NiO loading varing from 0.8 wt% to 18.7 wt% and calcination temperature ranging from 623 K to 873 K. The catalyst was studied by TPR, XPS, XRD and BET. The interactions between impregnated Ni2 and alumina during catalyst preparation produced different kinds of nickel species such as NiO crystallites and NiAl2O4-like species, and their distributions varied with NiO loading and calcination temperature, which leads to different activities of catalyst in hydroesterification of acetylene with methyl formate. Experimental results indicated that 10wt% NiO/Al2O3 calcined at 773 K is suitable for the hydroesterification of acetylene with methyl formate.