Microwave-assisted synthesis of MgO-CNTs supported ruthenium catalysts for ammonia synthesis

摘要

Small and uniform ruthenium nanoparticles (1.3-2.0 nm) supported on the mixture of MgO and carbon nanotubes (CNTs) were prepared by microwave irradiation and the promoted Ru/MgO-CNTs (K-Ru/MgO-CNTs-a) exhibited high activity for ammonia synthesis.The results show that the highest activity of the K-Ru/MgO-CNTs-a catalyst is 5631 mu mol h~(-1) g_(-cat)~(-1) under 0.20 MPa at 683 K.The activity is 2.2 times as active as that of K-Ru/MgO-CNTs-b prepared by conventional wet impregnation process.Moreover,this method preparing K-Ru/MgO-CNTs-a catalyst is fast and simple.