Ni Single Atoms Confined in Nitrogen-Doped Carbon Nanotubes for Active and Selective Hydrogenation of CO2 to CO,ACS Catalysis

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Ni Single Atoms Confined in Nitrogen-Doped Carbon Nanotubes for Active and Selective Hydrogenation of CO2 to CO
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-05-11 , DOI: 10.1021/acscatal.3c00767
Dongdong Wang ₁ , Zhenxuan Yuan ₁ , Xilin Wu ₂ , Wei Xiong ₁ , Jieqiong Ding ₁ , Zhenhua Zhang ₂ , Weixin Huang ₁

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Developing efficient non-precious-metal catalysts capable of selectively converting CO₂ into fuels and chemicals is desirable yet remains a challenge. Ni-based catalysts usually exhibit high activity in methanation reactions but low selectivity and stability in the reverse water-gas shift (RWGS) reaction. Herein, we report a Ni single-atom catalyst with Ni–N_x motifs confined in N-doped carbon nanotubes as an active, selective, and stable catalyst for the RWGS reaction, achieving almost 100% CO selectivity with a STY of 1.88 mol_CO g_Ni^–1 h^–1 at 500 °C and atmospheric pressure. In addition to weak CO adsorption, strong CO₂ adsorption and weak H₂ adsorption at the Ni–N_x active site were found to be responsible for the high catalytic activity and CO selectivity.

中文翻译：

限制在氮掺杂碳纳米管中的 Ni 单原子用于将 CO2 活性选择性氢化为 CO

_{开发能够选择性地将 CO 2}转化为燃料和化学品的高效非贵金属催化剂是可取的，但仍然是一个挑战。镍基催化剂通常在甲烷化反应中表现出高活性，但在逆水煤气变换 (RWGS) 反应中表现出低选择性和稳定性。在此，我们报告了一种 Ni 单原子催化剂，其 Ni-N _x基序限制在 N 掺杂碳纳米管中，作为 RWGS 反应的活性、选择性和稳定催化剂，实现了几乎 100% 的 CO 选择性，STY 为 1.88 mol _CO g _Ni^–1 h ^–1在 500 °C 和大气压力下。除了弱CO吸附、强CO ₂吸附和弱H ₂发现在 Ni-Nx 活性位点的吸附_是高催化活性和 CO 选择性的原因。

更新日期：2023-05-11

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