Effects of CeO_2 preparation methods on the catalytic performance of MoO_3/CeO_2 toward sulfur-resis

• 作 者: Dajun Meng Baowei Wang Zhen Liu Weihan Wang Zhenhua Li Xinbin Ma
• 机 构: Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering
• 出 处: Journal of Energy Chemistry
• 发表日期: 2017年03期
• 关键词: sulfur crystalline calcination saturated impregnation programmed desorption towa

CeO_2 supports were prepared by calcination or precipitation method and 5% MoO_3/CeO_2 catalysts were prepared by incipient-wetness impregnation method. The catalytic performance of the 5% MoO_3/CeO_2 catalysts toward sulfur-resistant methanation was investigated. The results showed that the Mo/Ce-1 catalysts with CeO_2 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 N_2-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 MoO_3 on Ce-3 support was lower than 5% and there were some crystalline MoO_3 particles on the surface of the Mo/Ce-3. The preparation method of CeO_2 had a big influence on the specific surface area, the crystalline of CeO_2, and the catalytic performance of the corresponding Mo-based catalyst for sulfur-resistant methanation.

CeO_2 supports were prepared by calcination or precipitation method and 5% MoO_3 / CeO_2 catalysts were prepared by incipient-wetness impregnation method. The catalytic performance of the 5% MoO_3 / CeO_2 catalysts toward sulfur-resistant methanation was investigated. / Ce-1 catalysts with CeO 2 support prepared by calcination method exhibits 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 N_2- 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 MoO_3 on Ce-3 support was lower than 5% and there were some crystalline MoO 3 particles on the surface of the Mo / Ce-3. The preparation method of CeO 2 had a big influence on the specific surface area, the crystalline of CeO 2, and the catalytic performance of the corresponding Mo-based catalyst for sulfur-resistant methanation.