Emerging Implications of the Concept of Hydricity in Energy‐Relevant Catalytic Processes,Chemistry - A European Journal

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Emerging Implications of the Concept of Hydricity in Energy‐Relevant Catalytic Processes
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-11-25 , DOI: 10.1002/chem.202004499
Abhishek Kumar ₁ , Shrivats Semwal ₁ , Joyanta Choudhury ₁

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The “hydricity” of a species refers to its hydride‐donor ability. Similar to how the pK_a is useful for determining the extent of dissociation of an acid, the hydricity plays a vital role in understanding hydride‐transfer reactions. A large number of transition‐metal‐catalyzed processes involve the hydride‐transfer reaction as a key step. Among these, two key reactions—proton reduction to evolve H₂ and hydride transfer to CO₂ to generate formate/formic acid—represent a promising solution to build a sustainable and fossil‐fuel‐free energy economy. Therefore, it is imperative to develop an in‐depth relationship between the hydricity of transition‐metal hydrides and its influencing factors, so that efficient and suitable hydride‐transfer catalysts can be designed. Moreover, such profound knowledge can also help in improving existing catalysts, in terms of their efficiency and working mechanism. With this broad aim in mind, some important research has been explored in this area in recent times. This Minireview emphasizes the conceptual approaches developed thus far, to tune and apply the hydricity parameter of transition‐metal hydrides for efficient H₂ evolution and CO₂ reduction/hydrogenation catalysis focusing on the guiding principles for future research in this direction.

中文翻译：

与能量有关的催化过程中水合概念的新含义

物种的“亲水性”是指其氢化物-给体能力。类似于p K _a可用于确定酸的解离程度，其水度在理解氢化物转移反应中起着至关重要的作用。大量的过渡金属催化过程涉及氢化物转移反应，这是关键步骤。其中，有两个关键反应-质子还原生成H ₂和氢化物转移至CO ₂生成甲酸/甲酸-是建立可持续且无化石燃料的能源经济的有前途的解决方案。因此，必须在过渡金属氢化物的水度及其影响因素之间建立深入的关系，以便可以设计出有效而合适的氢化物转移催化剂。而且，从其效率和工作机理方面，这种深刻的知识也可以帮助改进现有的催化剂。考虑到这一广泛的目标，近来在这一领域已经进行了一些重要的研究。这份Minireview强调了迄今为止开发的概念方法，以调整和应用过渡金属氢化物的水度参数以有效释放H ₂和CO _2。还原/加氢催化，重点是该方向上未来研究的指导原则。

更新日期：2020-11-25

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