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    逆水煤气变换反应非贵金属催化剂研究进展

    Research progress on non-noble metal catalysts for the Reverse Water-Gas Shift reaction

    • 摘要: 在“双碳”目标的驱动下,将煤化工尾气或工业捕集的CO2和绿氢转化为合成气的碳捕集与利用(CCU)技术成为实现温室气体减排的关键。逆水煤气变换(Reverse Water-Gas Shift, RWGS)反应可将CO2与H2转化为合成气(CO+H2),是连接CO2捕集与下游费托合成、甲醇制备的核心枢纽技术,对实现碳中和目标具有重要意义。然而,该反应的吸热特性要求高温操作(>400℃)以获得可观的CO2转化率和CO选择性,传统贵金属催化剂(Pt、Pd、Rh)虽活性优异但成本高昂,难以规模化应用。因此,开发兼具高活性、高稳定性与低成本的非贵金属催化剂成为当前研究热点。本文系统综述了氧化物、过渡金属碳/氮化物、磷化物等非贵金属 RWGS 催化剂的研究进展,揭示了氧化还原与缔合机理的动态竞争规律,总结了氧空位工程、界面协同等性能强化策略;指出碳化物/氮化物的类贵金属电子结构与磷化物的高选择性是当前核心优势,而低温活性不足与规模化制备成本是主要挑战,最后展望了原子级合成与原位表征结合的发展方向。

       

      Abstract: Driven by the “dual carbon” goals, carbon capture and utilization (CCU) technology, which converts CO2 from coal chemical tail gas or industrial capture and green hydrogen into syngas, has become a key to achieving greenhouse gas emission reduction. The reverse water-gas shift (RWGS) reaction, capable of converting CO2 and H2 into syngas (CO+H2), serves as a core hub technology connecting CO2 capture with downstream Fischer-Tropsch synthesis and methanol production, holding significant importance for realizing the carbon neutrality goal. However, the endothermic nature of this reaction requires high-temperature operation (>400℃) to achieve considerable CO2 conversion and CO selectivity. Although traditional noble metal catalysts (Pt, Pd, Rh) exhibit excellent activity, their high cost hinders large-scale application. Therefore, the development of non-noble metal catalysts with high activity, high stability, and low cost has become a current research focus. This paper systematically reviews the research progress of non-noble metal RWGS catalysts such as oxides, transition metal carbides/nitrides, and phosphides, reveals the dynamic competition law between redox and associative mechanisms, and summarizes performance enhancement strategies including oxygen vacancy engineering and interface synergy. It points out that the noble metal-like electronic structure of carbides/nitrides and the high selectivity of phosphides are the current core advantages, while insufficient low-temperature activity and high large-scale preparation cost are the main challenges. Finally, the development direction combining atomic-scale synthesis and in-situ characterization is prospected.

       

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