Understanding the importance of N−doping for CNT-supported Ni catalysts for CO2 methanation

Influence of carbon support surface modification on the performance of nickel catalysts in carbon dioxide hydrogenation

“…Hence the differences in weight-based activity might be explained by a different metal-support interaction and/or specific accessible Ni surface area for the different supports. Alternatively Gonҫalves et al reported for activated carbon and carbon nanotubes [12,40], that the amination treatment increased the catalytic activity during CO 2 hydrogenation, due to enhanced adsorption of CO 2 [23,40,57]. The latter was ascribed to the increased basicity of the support, where the adsorbed reaction intermediates can spill over from the basic groups onto the metal.…”

“…Recently the use of carbon, especially carbon nanotubes (CNTs) as support for CO 2 hydrogenation catalysts has gained more attention for fundamental studies [10][11][12]. Carbon materials are interesting model supports, because of their relatively high surface area and tunable surface chemistry [13].…”

“…They can enhance the wetting of the precursor solution or can anchor the metal precursor more strongly [29]. Both could result in smaller nanoparticles [30][31][32][33][34][35], or even single atoms or clusters [12,36].…”

Efficient CO2 methanation using nickel nanoparticles supported mesoporous carbon nitride catalysts

“…High Ni-doped heterogeneous catalysts are also known to have high intrinsic activity, high CH 4 selectivity, high availability, and low cost 19 but metal particle sintering and carbon formation on the catalyst surface at high temperatures are regarded as their main drawbacks 20 , 21 . So, several supports, such as Al 2 O 3 , the commonly used support with nickel 22 , SiO 2 23 , 24 , TiO 2 25 , and porous materials such as metal–organic frameworks (MOFs) 26 , 27 , zeolites 28 , 29 , carbon nanotubes 30 , 31 , carbon nanofibers 32 , 33 , MCM-41 34 and SBA-15 11 are used with nickel for this reaction.…”

Enhancing the performance of Cu catalysts for the reverse water–gas shift reaction using N-doped CNT–ZnO composite as support

“…19 Another methanation study revealed that Ni-based catalysts supported on CNTs provide an even better CO 2 conversion of 78.5%, confirming the benefit of having CNTs as a catalyst support. 20 An additional former work on the methanation reaction, consisted in evaluating if catalysts supported on carbon materials and metal oxide composites could further improve CO 2 conversion. The catalyst supported on a composite of carbon–CeO 2 achieved a higher CO 2 conversion, at a lower reaction temperature, than the catalyst supported on a carbon material.…”