课题组近期研究发现，类水滑石CoAl_x-LDH前驱体的层状结构促进CoAl_x-LD催化剂中高分散度的Co⁰活性中心的形成，有利于对反应物分子CH₄和CO₂的吸附和活化，促进了活性CH_x（x < 4）和CO₂^δ-物种形成，可进一步促进DRM反应的进行。同时，Co物种与Al物种的协同作用能有效提升CoAl复合催化剂的催化性能。通过Co/Al摩尔比可有效调控CoAl_x-LD催化剂表面Co⁰活性位、碱性位和氧空位数量，从而调控催化剂的CH₄/CO₂重整催化性能。Co/Al摩尔比为1/2的CoAl12-LD催化剂表现出优异的CH₄/CO₂重整催化性能。在常压和700 °C条件下，所制备的CoAl12-LD催化剂的CH₄和CO₂转化率分别达到86.8%和53.4%。此外，该催化剂在CH₄/CO₂重整反应也中表现出优异的使用稳定性。

Na Liu(刘娜), Hongmei Xie, Shuang Chen, Jia Zeng, Aiping Jia**, Guilin Zhou*. CoAl composite catalysts derived from hydrotalcite-like compounds for CH₄ efficient dry reforming[J].International Journal of Hydrogen Energy 87 (2024) 1023-1034.

https://doi.org/10.1016/j.ijhydene.2024.09.078

In this study, CoAl_x-LDHhydrotalcite-likewas used as the precursors to preparethe CoAl_x-LD composite catalysts for the DRMreaction. The transition metal Co was the main catalytic active centers for the DRM reaction. The layered structure of the hydrotalcite-like CoAl_x-LDH precursors promoted thehighly dispersed Co⁰ active centers to be formed in the CoAl_x-LD catalysts. In addition, synergistic effects between active sites, basic sites and oxygen vacancies can promote the DRMcatalytic performances of CoAl composite catalysts. Meanwhile, the Co/Al mole ratio can regulate the active sites, basic sites and oxygen vacancies in the catalysts, thereby affecting its catalytic performances. The CoAl12-LD catalyst with a Co/Al mole ratio of 1/2 exhibited excellent DRM catalytic performances.TheCH₄ and CO₂ conversions on the prepared CoAl12-LD catalyst achieved 86.8% and 53.4% at atmospheric pressure and 700 °C, respectively. In addition, the catalyst alsoshowed excellent use stability in the DRM reaction.