A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins.,ChemSusChem

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A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins.
ChemSusChem ( IF 7.5 ) Pub Date : 2019-08-07 , DOI: 10.1002/cssc.201900915
Maria Ronda-Lloret ₁ , Gadi Rothenberg ₁ , N Raveendran Shiju ₁

Affiliation

One of the main initiatives for fighting climate change is to use carbon dioxide as a resource instead of waste. In this respect, thermocatalytic carbon dioxide hydrogenation to high-added-value chemicals is a promising process. Among the products of this reaction (alcohols, alkanes, olefins, or aromatics), light olefins are interesting because they are building blocks for making polymers, as well as other important chemicals. Olefins are mainly produced from fossil fuel sources, but the increasing demand of plastics boosts the need to develop more sustainable synthetic routes. This review gives a critical overview of the most recent achievements in direct carbon dioxide hydrogenation to light olefins, which can take place through two competitive routes: the modified Fischer-Tropsch synthesis and methanol-mediated synthesis. Both routes are compared in terms of catalyst development, reaction performance, and reaction mechanisms. Furthermore, practical aspects of the commercialization of this reaction, such as renewable hydrogen production and carbon dioxide capture, compression, and transport, are discussed. It is concluded that, to date, the catalysts used in the carbon dioxide hydrogenation reaction give a wide product distribution, which reduces the specific selectivity to lower olefins. More efforts are needed to reach better control of the C/H surface ratio and interactions within the functionalities of the catalyst, as well as understanding the reaction mechanism and avoiding deactivation. Renewable H2 production and carbon dioxide capture and transport technologies are being developed, although they are currently still too expensive for industrial application.

中文翻译：

批判性研究二氧化碳直接催化加氢为烯烃。

应对气候变化的主要举措之一是将二氧化碳用作资源而不是废物。在这方面，将热催化二氧化碳加氢成高附加值的化学品是有前途的过程。在该反应的产物（醇，烷烃，烯烃或芳烃）中，轻质烯烃很有趣，因为它们是制造聚合物以及其他重要化学物质的基础。烯烃主要来自化石燃料，但是对塑料的需求不断增长，这促使人们需要开发更具可持续性的合成路线。这篇综述对二氧化碳直接制氢为轻质烯烃的最新进展进行了批判性概述，这可以通过两种竞争途径进行：改良的费-托合成法和甲醇介导的合成法。比较两种途径的催化剂发展，反应性能和反应机理。此外，还讨论了该反应商业化的实际方面，例如可再生氢的生产以及二氧化碳的捕集，压缩和运输。结论是，迄今为止，在二氧化碳加氢反应中使用的催化剂产生宽的产物分布，这降低了对低级烯烃的比选择性。需要付出更多的努力才能更好地控制C / H表面比率和催化剂功能范围内的相互作用，并了解反应机理并避免失活。正在开发可再生的氢气生产以及二氧化碳捕获和运输技术，尽管它们对于工业应用而言仍然太昂贵了。

更新日期：2019-08-07

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