Challenges and Opportunities in Synthesizing High Volume Chemicals from CO2 without Direct H2 Input.,ChemSusChem

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Challenges and Opportunities in Synthesizing High Volume Chemicals from CO2 without Direct H2 Input.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-09-18 , DOI: 10.1002/cssc.202001604
Longgang Tao ₁ , Tej S Choksi ₁ , Wen Liu ₁ , Javier Pérez-Ramírez _{2,

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Affiliation

Decarbonizing the chemical industry will eventually entail using CO₂ as a feedstock for chemical synthesis. However, many chemical syntheses involve CO₂ reduction using inputs such as renewable hydrogen. In this review, chemical processes are discussed that use CO₂ as an oxidant for upgrading hydrocarbon feedstocks. The captured CO₂ is inherently reduced by the hydrocarbon co‐reactants without consuming molecular hydrogen or renewable electricity. This CO₂ utilization approach can be potentially applied to synthesize eight emission‐intensive molecules, including olefins and epoxides. Catalytic systems and reactor concepts are discussed that can overcome practical challenges, such as thermodynamic limitations, over‐oxidation, coking, and heat management. Under the best‐case scenario, these hydrogen‐free CO₂ reduction processes have a combined CO₂ abatement potential of approximately 1 gigatons per year and avoid the consumption of 1.24 PWh renewable electricity, based on current market demand and supply.

中文翻译：

在没有直接输入氢气的情况下从二氧化碳合成大量化学品的挑战和机遇。

化学工业的脱碳最终将需要使用CO ₂作为化学合成的原料。但是，许多化学合成方法都涉及使用可再生氢等输入来还原CO ₂。在这篇综述中，讨论了使用CO ₂作为氧化剂提质烃原料的化学过程。烃类共反应物可固有地减少捕获的CO _2，而无需消耗分子氢或可再生电力。该CO ₂利用方法可潜在地用于合成八个排放密集型分子，包括烯烃和环氧化物。讨论了可以克服实际挑战（例如热力学限制，过氧化，结焦和热管理）的催化系统和反应器概念。在最佳情况下，根据当前的市场需求和供应量，这些无氢的CO ₂还原工艺每年可减少大约1吉吨的CO ₂，并且可避免消耗1.24 PWh可再生电力。

更新日期：2020-09-18

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