课题组近期研究发现，水热辅助CTAB（十六烷基三甲基溴化铵）软模板法制得的多孔CoCex复合催化剂具有优异的CH₄/CO₂重整催化活性。过渡金属Co作为CH₄/CO₂重整反应的主要活性中心，易在反应中失去电子，促进反应物分子CH₄和CO₂的活化。Ce物种的引入能促进高分散度金属Co物种和催化活性中心的形成，促进催化剂对CO₂分子的吸附与活化。Ce物种与Co物种间产生强电子效应，形成缺电子的CeO_2-δ和富电子的Co^δ-物种。CeO_2-δ物种的形成有利于CH₄分子的吸附活化形成CH_4-x（x = 0-4）活性物种；Co^δ-的形成有利于CO₂和CH₄分子的活化，从而促进DRM反应。Co/Ce摩尔比对CoCex催化剂的物理化学性质具有显著影响，Co/Ce摩尔比为2时制得的CoCe2催化剂具有最佳的CH₄/CO₂重整催化性能和稳定性。在反应温度为700 °C时，CH₄和CO₂转化率分别达88.6%和52.1%，且能保持较高循环使用稳定性。

该研究提供了关于Co与CeO₂间相互作用的重要信息，为开发高性能CH₄/CO₂干重整催化剂提供了理论基础和可行的思路。

Dong Zhang (张栋), Hongmei Xie, Shuang Chen, Guilin Zhou^∗. Porous CoCe composite catalyst prepared by hydrothermal assisted soft template method for CH₄/CO₂ dry reforming [J]. Fuel, 2022, 327: 125105. https://doi.org/10.1016/j.fuel.2022.125105

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 CeO_2-δ and electron-rich Co^δ- species to be formed. The formation of CeO_2-δ species facilitates the adsorption and activation of CO₂ molecules, and the active oxygen species on the CeO_2-δ surface facilitates the oxidative activation for CH₄ molecules. The CH₄ and CO₂ reactant molecules can be adsorbed and activated by the formed Co^δ- species to form CH_4-x (x = 0-4) and CO₂^δ- 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.