论文部分内容阅读
在220℃和50-60大气压条件下,利用固定床对NiO/SiO2、NiO/Al2O3、NiO-La2O3/Al2O3和NiO-Bi2O3/Al2O3催化剂上的乙炔与甲酸甲酯加氢酯化合成丙烯酸甲酯进行了研究。镍基催化剂对乙炔的加氢酯化合成丙烯酸甲酯具有很好的活性。用浸透法制备的Mo/SiO2催化剂的活性和丙烯酸甲酯的选择性均比离子交换法差。NiO/Al2O3催化剂用La或Bi改性后,其催化活性大大提高。XPS、XRD和TPR结果表明,当催化剂用La或Bi改性后,NiO的晶粒明显减小,催化剂表面的Ni/Al原子比增大,催化剂的第二个还原峰温大大降低。
Hydrogenation of acetylene and methyl formate on NiO / SiO2, NiO / Al2O3, NiO-La2O3 / Al2O3 and NiO-Bi2O3 / Al2O3 catalysts was carried out on a fixed bed at 220 ℃ and 50-60 atm. Were studied. Nickel-based catalysts have good activity on the hydrogenation of acetylene to methyl acrylate. The activity of Mo / SiO2 catalyst prepared by the soaking method and the selectivity of methyl acrylate are worse than ion exchange method. NiO / Al2O3 catalyst modified with La or Bi, its catalytic activity greatly increased. XPS, XRD and TPR results show that when the catalyst is modified with La or Bi, the grain size of NiO decreases obviously, and the Ni / Al atomic ratio of the catalyst surface increases, and the second reduction peak temperature of the catalyst decreases greatly.