Combining CO2 capture and catalytic conversion to methane

Abstract

Considering the global objective to mitigate climate change, import efforts are made on decreasing the net emission of CO 2 from gas effluents. On the one hand CO 2 capture-for example by adsorption onto solid basic materials-allows to withdraw CO 2 from the waste gas streams emitted by incinerators, cement manufacture plants, combustion plants, power plants, etc. On the second hand, CO 2 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 CO 2 , 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 CO 2 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".

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

“…Additionaly, CH 4 selectivity for many catalysts during CO 2 hydrogenation is high at temperatures that can coincide with those required for CO 2 desorption, thus rendering CH 4 as a preferable final product. The combination of these two processes, namely CO 2 adsorption and hydrogenation, in a single reactor can be realized via the development of novel dual-function materials (DFMs) that embody both adsorption and catalytic capabilities [19,20,25].…”

Transition Metal Dichalcogenides for the Application of Pollution Reduction: A Review

“…Over the decades, enormous efforts in searching of alternative technologies to mitigate the CO 2 emissions through CO 2 capture from concentrated industrial exhausts [ 233 , 234 ], sequestration of CO 2 in the underground [ 235 , 236 ] and conversion of CO 2 to energy-rich fuels powered by renewable energy resources [ 237 ] have been discovered. Throughout all these methods, CO 2 molecules are not solely can be removed from the atmosphere but also can be converted into value-added chemicals such as methanol, formic acid, methane, and syngas [ 238 , 239 , 240 ]. Recently, electrochemical conversion of CO 2 to value-added chemicals through the principal of CO 2 electrochemical reduction reaction (CO 2 ERR) as shown in Figure 10 a [ 241 ], has emerged as a comparative alternative to its counterparts such as biochemical and thermochemical technologies [ 242 , 243 , 244 ].…”

Hydrogenation of Carbon Dioxide to Methanol over Non−Cu‐based Heterogeneous Catalysts

“…The potential to perform separations at low energy penalties makes membrane strategies attractive for practical CO 2 removal applications. On the other hand, Debecker et al highlights the types of formulations of adsorbents, catalysts and dual functional materials that have been proposed, some basic process engineering aspects, and the reported performance for the combined CO 2 capture on solid adsorbents and CO 2 methanation on metalbased catalysts [12] . Two solids in two separate units is a first option that will mostly require process optimization, which allows not only to treat complex gas effluents but also to perform the methanation under clean conditions.…”