Porous CoCe composite catalyst prepared by hydrothermal assisted soft template method for CH4/CO2 dry reforming
发布时间：2024-11-29
点击次数：
- 影响因子：
- 8.305
- DOI码：
- 10.1016/j.fuel.2022.125105
- 所属单位：
- 环境与资源学院
- 教研室：
- 化学工程系
- 发表刊物：
- Fuel
- 项目来源：
- 重庆市教育委员会
- 关键字：
- CoCex composite catalysts；Hydrothermal assisted soft template method；Oxygen vacancy；Electronic effects；CH4/CO2 dry reforming
- 摘要：
- The CoCex composite catalysts prepared by hydrothermal assisted template agent CTAB, have superior catalytic performances for CH4/CO2 dry reforming (DRM). The physicochemical properties of the catalysts were investigated in depth with the help of XRD, H2-TPR, CO2-TPD, ICP, Quasi in-situ XPS and N2 adsorption–desorption measurements. The transition metal Co is the main active center in the DRM reaction, which can easily release the outer electrons in the reaction to activate the reactant molecules. The introduction of Ce species can promote the highly dispersed metal Co species and catalytic active centers to be formed, as well as the adsorption and activation of CO2 molecules by the catalyst. Ce species can produce strong electronic effects with Co species, which can promote the electron-deficient CeO2-δ and electron-rich Coδ- species to be formed. The formation of CeO2-δ species facilitates the adsorption and activation of CO2 molecules, and the active oxygen species on the CeO2-δ surface facilitates the oxidative activation for CH4 molecules. The CH4 and CO2 reactant molecules can be adsorbed and activated by the formed Coδ- species to form CH4-x (x = 0–4) and CO2δ- reactive species, which can promote the DRM reaction. The Co/Ce molar ratio has an important effect on the physicochemical properties and CO2 adsorption performance of CoCex catalysts. And the CoCe2 catalyst prepared at a 2.0 Co/Ce molar ratio exhibited superior catalytic performance and high stability for the DRM reaction. The CH4 and CO2 conversion of the CoCe2 catalyst reached 88.6%, and 52.1% at 700 °C, respectively. In addition, the CoCe2 catalyst can maintain high cycle stability for CH4/CO2 dry reforming.
- 第一作者：
- Dong Zhang
- 合写作者：
- Hongmei Xie,Shuang Chen
- 论文类型：
- 源刊论文
- 通讯作者：
- Guilin Zhou
- 学科门类：
- 工学
- 文献类型：
- Journal Article
- 卷号：
- 327
- 页面范围：
- 125105
- 是否译文：
- 否
- 发表时间：
- 2022-07-01
- 收录刊物：
- SCI