Considering the global objective to mitigate climate change, import efforts are made on decreasing the net emission of CO₂ from gas effluents. On the one hand CO₂ capture—for example by adsorption onto solid basic materials—allows to withdraw CO₂ from the waste gas streams emitted by incinerators, cement manufacture plants, combustion plants, power plants, etc. On the second hand, CO₂ can be converted to useful chemicals—e.g. hydrogenation to methane—using appropriate heterogeneous catalysts. A relatively innovative strategy consists in combining both technologies by designing materials and processes which can switch between capture and methanation modes cyclically. This allows treating complex waste gas effluents by selectively and reversibly capturing CO₂, and to perform the catalytic hydrogenation in appropriate reaction conditions. This short review presents the main strategies recently reported in the literature for such combined CO₂ capture and methanation (CCCM) processes. We discuss the different types of reactor configurations and we present the formulations used in this context as adsorbent, as methanation catalysts, and as “dual functional materials”.

中文翻译：

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结合CO 2捕集和催化转化为甲烷

考虑到减轻气候变化的全球目标，在降低气体排放的净CO ₂排放量方面做出了进口努力。一方面，CO ₂捕集-例如通过吸附到固体碱性材料上-允许从焚化炉，水泥制造厂，燃烧厂，发电厂等排放的废气流中吸收CO _2。另一方面，CO ₂可以使用适当的非均相催化剂转化为有用的化学物质，例如加氢成甲烷。相对创新的策略是通过设计可以周期性地在捕获和甲烷化模式之间切换的材料和工艺来结合这两种技术。这允许通过选择性地和可逆地捕获CO ₂来处理复杂的废气流出物，并在适当的反应条件下进行催化氢化。这篇简短的综述介绍了文献中最近报道的有关此类CO ₂捕集和甲烷化（CCCM）组合工艺的主要策略。我们讨论了不同类型的反应器配置，并介绍了本文中用作吸附剂，甲烷化催化剂和“双重功能材料”的配方。