Zhao Tingting, Zhao Jiankang, Tao Xuyingnan, Yu Haoran, Li Ming, Zeng Jie, Wang Haiqian
Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 230026, Hefei, Anhui, People's Republic of China.
Commun Chem. 2022 Jun 3;5(1):70. doi: 10.1038/s42004-022-00686-4.
It is important to develop highly active and stable catalysts for high temperature reactions, such as dry reforming of methane. Here we show a La(NiCo)O (LNCO) submonolayer catalyst (SMLC) stabilized by the surface lattice of a perovskite LaCrO support and demonstrate a Ni-Co synergistic effect. The submonolayer/support type catalyst was prepared by in-situ hydrogen reduction of a LaNiCoCrO precursor synthesized by a sol-gel method. The LNCO-SMLC is highly active and very stable during a 100 h on stream test at 750 °C under the reaction conditions of dry reforming of methane. The catalyst also shows good anti-coking ability. We found that the synergistic effect between Ni and Co atoms in LNCO-SMLC remarkably improved the thermostability of the catalyst. This work provides a useful concept for designing atomically dispersed catalysts with high thermostability.
开发用于高温反应（如甲烷干重整）的高活性和稳定催化剂非常重要。在此，我们展示了一种由钙钛矿LaCrO载体的表面晶格稳定的La(NiCo)O（LNCO）亚单层催化剂（SMLC），并证明了Ni-Co协同效应。通过溶胶-凝胶法合成的LaNiCoCrO前驱体的原位氢还原制备了亚单层/载体型催化剂。在甲烷干重整反应条件下，于750℃进行100小时的连续测试期间，LNCO-SMLC具有高活性且非常稳定。该催化剂还显示出良好的抗结焦能力。我们发现，LNCO-SMLC中Ni和Co原子之间的协同效应显著提高了催化剂的热稳定性。这项工作为设计具有高热稳定性的原子分散催化剂提供了一个有用的概念。
