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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Unravelling the strong metal-support interaction between Ru quantum dots and g-C3N4 for visible-light photocatalytic nitrogen fixation
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Unravelling the strong metal-support interaction between Ru quantum dots and g-C3N4 for visible-light photocatalytic nitrogen fixation

机译：揭示Ru量子点和G-C3N4之间的强金属支持相互作用，用于可见光光催化氮固定

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摘要

Renewable ammonia production technologies based on clean energy are highly expected, especially photocatalytic nitrogen fixation. Strong metal-support interaction (SMSI) usually occurs between the transition metal and the support, and enhances the activity and stability of the catalysts. In this paper, it is found that the strong interaction between Ru quantum dots and g-C3N4 nanosheets significantly improves the photocatalytic nitrogen fixation performance. A series of catalysts with different Ru loadings (1 wt.%, 3 wt.% and 5 wt.%) were prepared. Due to the SMSI, Ru quantum dots (similar to 3 nm) do not agglomerate, and the electron transfer from g-C3N4 to Ru leads to the formation of more Ru degrees. These factors are responsible for better and more stable performances of the photocatalytic reduction of N2 to NH3 in water compared to pure g-C3N4. The ammonia production rate over the as-synthesized RuCN-3 catalyst is 20.55 mu mol g(-1) in the absence of sacrificial agent in a nitrogen atmosphere for 2 h. It should be noted that SMSI can also protect active sites, thus significantly improve their catalytic stability. By solving the energy band structure, the reaction mechanism of photocatalytic nitrogen fixation was explained. This study provides a promising and sustainable strategy for photocatalytic nitrogen fixation.
机译：基于清洁能源的可再生氨生产技术备受期待，尤其是光催化固氮技术。过渡金属和载体之间通常发生强烈的金属-载体相互作用（SMSI），提高了催化剂的活性和稳定性。本文发现，Ru量子点与g-C3N4纳米片之间的强相互作用显著提高了光催化固氮性能。制备了一系列不同Ru负载量（1重量%、3重量%和5重量%）的催化剂。由于SMSI，Ru量子点（类似于3nm）不会团聚，并且从g-C3N4到Ru的电子转移导致更多Ru度的形成。与纯g-C3N4相比，这些因素使光催化还原水中N2为NH3的性能更好、更稳定。在氮气气氛中，在没有牺牲剂的情况下，合成的RuCN-3催化剂上的氨产率为20.55μmol g（-1）。应该注意的是，SMSI还可以保护活性中心，从而显著提高其催化稳定性。通过求解能带结构，解释了光催化固氮的反应机理。本研究为光催化固氮提供了一种有前途的、可持续的策略。

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