SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (6): 1628-1636.DOI: 10.1016/j.cjche.2020.03.016

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Promotion effect of Re additive on the bifunctional Ni catalysts for methanation coupling with water gas shift of biogas: Insights from activation energy

Xinxin Dong, Baosheng Jin, Zhiwei Kong, Yiqing Sun   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, China
  • 收稿日期:2019-08-21 修回日期:2020-02-11 出版日期:2020-06-28 发布日期:2020-07-29
  • 通讯作者: Baosheng Jin

Promotion effect of Re additive on the bifunctional Ni catalysts for methanation coupling with water gas shift of biogas: Insights from activation energy

Xinxin Dong, Baosheng Jin, Zhiwei Kong, Yiqing Sun   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, China
  • Received:2019-08-21 Revised:2020-02-11 Online:2020-06-28 Published:2020-07-29
  • Contact: Baosheng Jin

摘要: The cheap manganese sand was first modified by H2O2 and was further creatively utilized as Ni-based catalyst support. In order to enhance the catalytic performance, Re was added into the Ni-based catalyst and the promotion effect of Re on the methanation coupling with water gas shift of biogas was investigated from the perspective of activation energy. It was found that CH4 and CO2 formation rates, which separately represented the reaction rate of methanation and water gas shift, were both enhanced after Re addition compared to non-added catalyst. Two kinetics models including empirical model and K-model were employed and from the results of calculation, it showed that Re selectively decreased the activation energy of methanation reaction and had little impact on the activation energy of water gas shift. The increased CO2 formation rate was owing to the assistance of accelerated H2O production from methanation rather than the activation energy change in water gas shift.

关键词: Promoter, Catalyst, Nickel, Methanation, Water gas shift, Kinetics

Abstract: The cheap manganese sand was first modified by H2O2 and was further creatively utilized as Ni-based catalyst support. In order to enhance the catalytic performance, Re was added into the Ni-based catalyst and the promotion effect of Re on the methanation coupling with water gas shift of biogas was investigated from the perspective of activation energy. It was found that CH4 and CO2 formation rates, which separately represented the reaction rate of methanation and water gas shift, were both enhanced after Re addition compared to non-added catalyst. Two kinetics models including empirical model and K-model were employed and from the results of calculation, it showed that Re selectively decreased the activation energy of methanation reaction and had little impact on the activation energy of water gas shift. The increased CO2 formation rate was owing to the assistance of accelerated H2O production from methanation rather than the activation energy change in water gas shift.

Key words: Promoter, Catalyst, Nickel, Methanation, Water gas shift, Kinetics