Operando FT-IR study on basicity improvement of Ni(Mg, Al)O hydrotalcite-derived catalysts promoted by glow plasma discharge

Abstract

CO 2 adsorption on the surface of hydrotalcite-derived mixed oxide catalysts was investigated under low pressure glow discharge plasma in operando conditions via FT-IR spectroscopy. Nickel catalysts were promoted with various transition metal species (Ce, Fe, La, Zr) to influence their physico-chemical properties. Fe and Zr species were successfully incorporated into hydrotalcite brucite layers. After calcination formed a single phase with Ni(Mg, Al)O mixed oxide, while La and Ce species formed separate phases. This had a consequence in the distribution of surface basic sites as well as in the affinity to CO produced upon CO 2 dissociation in plasma. Plasma treatment activated the surface of prepared materials and changed their properties via the generation of strong basic sites associated with low coordinated surface oxygen anions. Moreover, the CO 2 adsorption capacity of prepared materials increased after plasma treatment.

Low-pressure glow discharge plasma-assisted catalytic CO2 hydrogenation—The effect of metal oxide support on the performance of the Ni-based catalyst

“…The CO 2 adsorption capacity was greater for spent catalysts than for fresh one. Similar observations were reported for nickel-based, hydrotalcite-derived catalysts [74], proving that plasma modifies not only the metallic nickel species but also affects support properties. The supports with high CO 2 adsorption capacity are reported to have a beneficial influence on the performance of CO 2 methanation catalyst [2,3].…”

A review on plasma-catalytic methanation of carbon dioxide – Looking for an efficient catalyst

“…The origin of that synergetic effect comes from the change of catalyst surface properties eg. surface basicity [182], CO and CO2 adsorption capacities [183] or the plasma properties which may affect dissociation of CO2 to CO occurring in the gas phase [184] (see section 4.5). In the present section the summary of research on plasma-catalytic CO2 hydrogenation to CH4 will be presented, as well as the effect of plasma pre-treatment on the catalytic activity in CO2 methanation.…”

“…Therefore, plasma treatment of catalyst may result in a material which greatly differs from catalyst prepared via conventional thermal treatment. In general, plasma can be applied at any step of catalyst preparation or regeneration of deactivated catalyst [24,28,182,185,186]. For CO2 methanation catalysts, plasma pre-treatment was applied to decompose nickel precursors, usually nickel nitrate.…”

“…Another recent study performed by Dębek et al [182,183] who investigated Ni-based catalyst supported on various metal oxides and with the application of low-pressure glow discharge plasma gave insights into mechanistic aspects of hybrid plasma-catalytic process. Their research revealed that plasma promotes creation of strong basic sites, associated with low coordinated oxygen species, on the surface of hydrotalcite-derived catalysts.…”

Novel Nickel- and Magnesium-Modified Cenospheres as Catalysts for Dry Reforming of Methane at Moderate Temperatures

“…Although the noble metals are more resistant to carbon deposition, as well as more active than nickel, they are more expensive and less available. For this reason, in order to allow the DRM to become a fully mature industrial process, there is a need to develop a Ni-based catalyst which is more active and more stable, as well as low-cost and eco-friendly [26]. To the best of our knowledge, no studies concerning the use of cenospheres as catalysts for dry reforming of methane have been reported in the literature.…”