Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO₂ conversion has been attracting extensive attention. In this work, Ni nanoparticle-loaded N-doped CeO₂ (Ni/N-CeO₂) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N_5.0-CeO₂ exhibited a CO yield rate of 20.9 mmol·g_cat^–1·h^–1 with almost 100% of CO selectivity via photothermal CO₂ reduction. As a comparison, Ni/CeO₂, without nitrogen doping, showed a high CH₄ selectivity. The strong light absorption of Ni/N_5.0-CeO₂ mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO₂ molecules due to increased oxygen vacancies in N_5.0-CeO₂ by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N–H bonds, which could modulate the reaction pathway for promoting the reduction of CO₂ toward CO while suppressing the undesirable CO₂ methanation process.

中文翻译：

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在 Ni 纳米颗粒/N 掺杂 CeO2 纳米复合催化剂上选择性光热还原 CO2 为 CO

光热逆水煤气变换反应是缓解全球能源和环境问题的一种很有前景的方法。寻找具有高活性和CO选择性的CO ₂转化催化剂已引起广泛关注。在这项工作中，使用三步法合成了负载Ni 纳米颗粒的N 掺杂CeO ₂ (Ni/N-CeO ₂ ) 复合催化剂。在光照射下，最佳的Ni/N _5.0 -CeO ₂表现出20.9 mmol·g _cat ^–1 ·h ^–1的CO 产率，通过光热CO ₂还原几乎100％的CO 选择性。作为比较，Ni/CeO ₂在没有氮掺杂的情况下，显示出高 CH ₄选择性。Ni/N _5.0 -CeO _{2 的}强光吸收主要是由于 Ni 纳米颗粒的负载以及N 掺杂导致 N _5.0 -CeO _{2 中}氧空位增加导致CO ₂分子的吸附/活化增强催化性能。氮的掺杂对于 N-H 键的形成特别重要，它可以调节反应途径，促进 CO ₂还原为 CO ，同时抑制不需要的 CO ₂甲烷化过程。