Carbon-supported gas-cleaning catalysts enable syn gas methanation at atmospheric pressure

Abstract

Though feasible for CO methanations in gas-cleaning applications ([CO] < 1%), carbon-nanotube-supported catalysts have never been implemented for the production of synthetic natural gas.

Sustainable Carbon as Efficient Support for Metal-Based Nanocatalyst: Applications in Energy Harvesting and Storage

“…Reaction (1) deals with the methanation of CO 2 while Reaction (2) deals with the methanation of CO. Methanation of CO is mainly applied for the production of SNG from gas streams with high concentrations of CO and/or CO 2 [ 80 ]. In addition, CO methanation can also be employed in the removal of trace amounts of CO from H 2 streams [ 86 ]. Meanwhile, methanation of CO 2 has gained attention in recent years as a way for CO 2 capture and reutilization, diminishing greenhouse gas emissions.…”

“…Many different types of supporting materials have been reported for methanation catalyst, including Al 2 O 3 , SiO 2 , ZrO 2 , TiO 2 , and CeO 2 ; as well as structured metal oxides, carbon, and zeolite materials [ 78 , 80 , 85 ]. Among the carbon materials that have been employed as a support for methanation catalysts, we found carbon nanotubes [ 86 , 87 ], activated carbon [ 88 ], carbon nanofiber [ 89 ], biochar-based materials [ 90 , 91 , 92 ], and carbon felt [ 93 ]. As an example, carbon nanotubes have been widely used as a support of metal nanoparticles due to their exceptional physico-chemical properties.…”

“…As an example, carbon nanotubes have been widely used as a support of metal nanoparticles due to their exceptional physico-chemical properties. Ni nanoparticles supported on carbon nanotubes have demonstrated a remarkable activity for the methanation reaction as shown in Figure 5 [ 86 ]. The use of carbon-based materials as a support offers numerous benefits, such as, for example, the presence of adsorption sites, conductivity and thermal stability to manage temperature gradients, tunable surface properties, high surface area, and reduced tendency to coke deposition that leads to catalyst deactivation [ 4 , 32 ].…”

H2 production from aqueous-phase reforming of glycerol over Cu–Ni bimetallic catalysts supported on carbon nanotubes

“…However, issues of cost and availability have inspired efforts to reduce or eliminate the use of these metals in APR. Ni is an attractive substitute because it is highly active for reactions involving CeC bond breaking, such as alkane hydrogenolysis [36]; however, Ni is also a good catalyst for CO methanation [29,30,37]. Moreover, it is prone to inactivation by carbon deposition [38], which has been observed on supported Ni catalysts during APR [35,39].…”

“…They are thermally conductive, and thermally stable at temperatures relevant to APR, even after functionalization with Ni [37]. To date, most C-supported catalysts for APR have been based on noble metals [57e63], and few have been bimetallic [64].…”