Various strategies are proposed to date in order to convert CO 2 to large diversity of useful chemicals. The following review discusses two important approaches that produce methanol from CO 2 . These two includes CO 2 hydrogenation and electrocatalytic routes. These processes could recycle CO 2 , permitting a carbon neutral, closed loop of fuel combustion and CO 2 reduction to prevent a rising concentration of this greenhouse gas in the atmosphere. Besides, intermittent electricity generation can be stored in an energy-dense, portable form in chemical bonds. The present review reports more recent findings and drawbacks of these two processes. The present review study revealed that the hydrogenation process could become readily operational in comparison to electrocatalytic process. The electrocatalytic approach still has serious technical issues in terms of kinetically sluggish multi-electron transfer process during CO 2 reduction reaction that requires excessive over-potential, relatively poor selectivity, poor durability in the long term, and the absence of the optimized standard experimental and commercial systems.

中文翻译：

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通过二氧化碳回收发电甲醇技术：二氧化碳加氢和电催化路线

为了将CO 2 转化为种类繁多的有用化学品，迄今为止提出了各种策略。下面的综述讨论了从 CO 2 生产甲醇的两种重要方法。这两条包括CO 2 加氢和电催化路线。这些过程可以回收 CO 2 ，​​从而实现燃料燃烧和 CO 2 还原的碳中和闭环，以防止大气中这种温室气体的浓度上升。此外，间歇性发电可以通过化学键以能量密集、便携的形式存储。本综述报告了这两个过程的最新发现和缺点。本综述研究表明，与电催化过程相比，氢化过程可以变得容易操作。