The potential of biocarbon as CO2 adsorbent in VPSA unit

Abstract

The best solution to the main environmental problem seems to be CO2 capture to reduce greenhouse gas emissions. The activated carbons derived from biomass have attracted extensive attention as solid adsorbent for carbon dioxide capture process. In this work, we focus on examining the properties of biochar (non-activated porous carbon) produced from biomass. Physicochemical properties of the biochar were investigated by thermogravimetric analysis (TG), Fourier transform infrared spectroscopy, scanning electron microscopy and N2 adsorption–desorption at 77 K. In order to evaluate the possibility of using biocarbons for CO2 adsorption in large-scale VPSA units, investigations of these adsorbents in laboratory are necessary. The paper present the potential of biochar for CO2 capture in VPSA unit. The examination of the CO2 sorptive capability, stability and regeneration performance of biochar was carried out using a Mettler-Toledo TGA/SDTA 851e thermobalance and TG-Vacuum system. The sorption of CO2 was carried out isothermally in a flow of a mixture of gasses: CO2 (100 vol.%) and CO2 (16 vol.%)/N2 (84 vol.%). The commercial biochar showed a sorption performance for CO2 up to 26.4 mg CO2 g−1 adsorbent at 30 °C and 30 bar. Repeated use of the adsorbent in the sorption/desorption cycle did not affect its performance, which indicates high sorption stability.

Sustainable valorisation of food waste into engineered biochars for CO2 capture towards a circular economy

“…A combination of the PSA and VSA processes, denoted as the VPSA process, has attracted much attention; its adsorption step is performed at above atmospheric pressure, and its desorption step is performed under vacuum. Izabela and Marcelina 77 reported that engineered biochar-based adsorbents, even with poor CO 2 uptake in sample-level CO 2 adsorption, achieved high CO 2 working capacities in a VPSA process. They also tested biomass-based carbonaceous materials in this VPSA process, highlighting their potential as practical CO 2 adsorbents for commercial CO 2 capture.…”

Prospects of carbon capture, utilization and storage for mitigating climate change

“…However, by 2040 more than 2500 large-scale CCS/CCU facilities are required to limit climate change to 2℃ (11)(12)(13). The methods of post-combustion carbon capture include adsorption by solid materials and aqueous (14) along with afforestation and in situ injection and storage of carbon in the form of treated biomass (biocarbon/biochar). The adsorption methods are less energyintensive as well as avoid the production of contaminated sorbents and adverse byproducts (14,15).…”

“…The methods of post-combustion carbon capture include adsorption by solid materials and aqueous (14) along with afforestation and in situ injection and storage of carbon in the form of treated biomass (biocarbon/biochar). The adsorption methods are less energyintensive as well as avoid the production of contaminated sorbents and adverse byproducts (14,15). Consequently, carbon balance not only in the terrestrial ecosystem but also in the entire ecosystem by 2050 would be the key to mitigating global climate changes.…”

“…The adsorption methods are less energy-intensive as well as avoid the production of contaminated sorbents and adverse byproducts. 14,15 Consequently, carbon balance not only in the terrestrial ecosystem but also in the entire ecosystem by 2050 would be the key to mitigating global climate changes.…”

CO2 Capture and Low-Temperature Release by Poly(aminoethyl methacrylate) and Derivatives

“…Consequently, it is not surprising that recent times have seen a rise in interest regarding CO 2 capture and separation. − The studies explore various physical and chemical methods of adsorption of CO 2 into solids ,,,− or absorption into liquids. − Liquid technologies are already well-established and applied in industry, yet it has been suggested that further development is needed. ,, The main issues are the energy consumption of regeneration, running costs coming from evaporation, and the environmental impact of the solvents used. , Solid adsorbents have the potential to be less energy demanding and more efficient compared to liquids . Solid monomeric, oligomeric, or polymeric adsorbents, ,,, polymer membranes, , and hybrid systems ,,, are being developed to solve the issues with conventional liquid systems to allow lower regeneration temperatures, the avoidance of solvents, and an increase in the active surface area for more sustainable and efficient systems.…”