Comprehensive review of nickel-based catalysts advancements for CO2 methanation

A comprehensive review of enhanced CO2 capture using activated carbon derived from biomass feedstock

Capturing CO2 using clamshell/eggshell-derived CaO adsorbent can not only reduce carbon emissions but also alleviate the impact of trash on the environment. However, organic acid was usually used, high-temperature calcination was often performed, and CO2 was inevitably released during preparing CaO adsorbents from shell wastes. In this work, CaO-based CO2 adsorbent was greenly prepared by calcium-induced hydrogenation of clamshell and eggshell wastes in one pot at room/moderate temperature. CO2 adsorption experiments were performed in a thermogravimetric analyzer (TGA). The adsorption performance of the adsorbents obtained from the mechanochemical reaction (BM-C/E-CaO) was superior to that of the adsorbents obtained from the thermochemical reaction (Cal-C/E-CaO). The CO2 adsorption capacity of BM-C-CaO at 650 °C is up to 36.82 wt%, but the adsorption decay rate of the sample after 20 carbonation/calcination cycles is only 30.17%. This study offers an alternative energy-saving method for greenly preparing CaO-based adsorbent from shell wastes. 

Green preparation of CaO-based CO2 adsorbent by calcium-induced hydrogenation of shell wastes at room/moderate temperature.

Preparation of red mud derived eggshell coupling adsorbent and study on carbon dioxide capture performance based on experiment and density functional theory simulation

CeO2 enhanced performance of NiFe2O4-CaO for carbon capture and in-situ hydrogenation conversion to CO

Storing and in-situ hydrogenating CO2 to CH4 by dual functional materials (DFMs) is an efficient solution to alleviate the greenhouse effect and energy shortage. However, in the multi-step preparation process of DFMs, high-temperature calcination is usually required, solvent is used, and NO2/CO2 is inevitably emitted. In this work, we first reported that the Ni/MgO DFMs could be mechanochemically synthesized in one step at room temperature by magnesium-induced hydrogenation of Ni-mixed magnesium carbonate without using any solvent and NO2/CO2 emission. Integrated CO2 capture and methanation performance of the Ni/MgO DFMs are investigated isothermally in a TG-MS apparatus and a fixed bed reactor. The CO2 uptake and CH4 yield over the 80Ni/MgO DFM at 300 ℃ are 0.37 mmol/g and 0.27 mmol/g, respectively, with a CO2 conversion of 73.0 % and CH4 selectivity of 100 %. After 5 consecutive CO2 capture and methanation cycles at 300 ℃, the CO2 uptake and CH4 yield over the 50Ni/MgO DFM still are 0.26 mmol/g and 0.18 mmol/g, respectively, with a CO2 conversion of 69.2 % and CH4 selectivity of 100 %. Furthermore, the mechanism of CO2 adsorption, activation, and hydrogenation to methane over the Ni/MgO DFM is systematically investigated by using density functional theory (DFT) calculations. This study offers an alternative, green, and sustainable strategy to acquire DFMs for CO2 capture and methanation. 

Mechanochemical synthesis of Ni/MgO dual functional materials at room temperature for CO2 capture and methanation

Selective hydrogenation of eggshell/clamshell to methane with the assistance of the alkaline earth and transition metals at room temperature

MgH2-modified Ni catalysts with electron transfer behavior for improving CO2 methanation.

Activated LiBH4 and Ni/LiBH4-assisted CO2 hydrogenation to C1, C2 products at low temperature

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