Pd/MCM-41 catalyst for acetylene hydrogenation to ethylene

This study aims to produce ethylene using the calcium carbide route, acetylene from calcium carbide and then selective hydrogenation of the high-concentration acetylene to ethylene. A series of catalysts with different supports, such as Al2O3, SiO2 and MCM-41, were prepared using the ethylene glycol reduction method and their catalytic properties for high-concentration acetylene hydrogenation of calcium carbide to ethylene were studied by transmission electron microscopy, X-ray powder diffraction and thermogravimetry, among others. The results show that the small particle size and uniform dispersion of Pd particles in the Pd/MCM-41 catalyst produced the highest ethylene yield of 62.09%. Then the conditions for the basic reaction, such as reaction temperature and space velocity, were optimized using MCM-41 as a support. The yield of ethylene after condition optimization was as high as 82.87%, while the loading of Pd was 0.1.本研究旨在通过电石路线制备乙烯：先由电石制取乙炔，再将高浓度乙炔选择性加氢转化为乙烯。采用乙二醇还原法（ethylene glycol reduction method）制备了一系列以不同载体负载的催化剂，涵盖氧化铝（Al₂O₃）、二氧化硅（SiO₂）以及MCM-41，并借助透射电子显微镜、X射线粉末衍射、热重分析法等表征手段，探究了其应用于电石高浓度乙炔加氢制乙烯反应的催化性能。研究结果表明，Pd/MCM-41催化剂中钯（Pd）颗粒粒径小且分散均匀，对应的乙烯收率最高可达62.09%。随后以MCM-41为载体，对反应温度、空速等基础反应条件进行了优化。当钯负载量为0.1时，经条件优化后的乙烯收率最高可达82.87%。