Effects of CeO2 preparation methods on the catalytic performance of MoO3/CeO2 toward sulfur-resistant methanation

Abstract

CeO2 supports were prepared by calcination or precipitation method and 5% MoO3/CeO2 catalysts were prepared by incipient-wetness impregnation method. The catalytic performance of the 5% MoO3/CeO2 catalysts toward sulfur-resistant methanation was investigated. The results showed that the Mo/Ce-1 catalysts with CeO2 support prepared by calcination method exhibited the best sulfur-resistant methanation activity and stability with CO conversion as high as 75% while the Mo/Ce-3 catalysts the poorest. The supports and catalysts were characterized by N2-adsorption–desorption, temperature-programmed reduction (TPR), X-ray diffraction (XRD), Raman spectroscopy (RS) and scanning electron microscope (SEM). The results indicated that the saturated monolayer loading MoO3 on Ce-3 support was lower than 5% and there were some crystalline MoO3 particles on the surface of the Mo/Ce-3. The preparation method of CeO2 had a big influence on the specific surface area, the crystalline of CeO2, and the catalytic performance of the corresponding Mo-based catalyst for sulfur-resistant methanation.