Sulfur-resistant methanation over MoO3 /CeO2 –ZrO2 catalyst: Influence of Ce-addition methods

• 作者: Baowei Wang Renjie Liu Weihan Wang Xinbin Ma Yan Xu Zhaopeng Liu Zhenhua Li
• 来源期刊: 能源化学
• 年，卷（期）: 2019,（1）
• 页码范围: 31-38
• 页数: 8页
• 语种: 英文

摘要

In this paper, Ce0.2 Zr0.8O2 composite supports were prepared by different Ce-addition methods including impregnation of cerium (CeZr-imp), impregnation of citric acid and cerium (CeZr-CA) simultaneously and deposition precipitation method (CeZr-DP), respectively. The as-prepared supports were applied to pre-pare 10 wt% MoO3 /Ce0.2Zr0.8O2 catalysts for sulfur-resistant methanation. The N 2 adsorption/desorption, X-ray diffraction (XRD), Raman spectroscopy (RS), X-ray photoelectron (XPS), temperature-programmed reduction by hydrogen (H 2 -TPR) were undertaken to get textural properties, morphological information and structures of the catalysts. The results showed that MoO3 was highly dispersed on the surface of these three supports and Ce was mostly of coexisted in Ce4 /Ce3 redox pairs. Compared with Mo/CeZr-imp, the CO conversion increased by 10% and 15% for Mo/CeZr-CA and Mo/CeZr-DP, respectively. This was mainly attributed to the larger specific surface area, Ce3 concentration and content of active MoS2 on the surface of catalysts.