A novel integrated CO₂ capture and direct methanation process using Ni/CaO catal-sorbents

Abstract

A Ni/CaO catal-sorbent could be used to reduce the required thermal energy by converting the captured CO2 to CH4 under H2 at temperatures lower than those required for conventional decarbonation.

Recent advances in integrated CO2capture and utilization: a review

“…7b, Luis et al 71 reported that a higher temperature improved both CO2 conversion and CO selectivity owing to the endothermic properties of RWGS. A similar trend in relation to the influence of temperature was also reported by Jo et al 43 using Ni/CaO DFMs. Shao et al 72 analyzed the temperature-programmed desorption of ICCU-RWGS using a FexCoyMg10CaO DFM and found that CO could be generated at 550 °C, which was earlier than CO2 release.…”

“…Integrating CO2 capture and methanation (ICCU-methanation) has advantages in improving the process and energy efficiency. 42 and Jo et al 43 . The match of temperature between adsorption and methanation is also very important for ICCU.…”

“…The authors reported that a higher H2 concentration is important for the activation of Ru-based DFMs when processing an O2-containing flue gas. The higher H2 concentration could also effectively improve the CO2 conversion by positively promoting the equilibrium of CO2 methanation 43,53 . Apart from gas concentration, GHSV also influences the ICCU performance by altering the gas diffusion pathways within DFMs 44 .…”

Capture and Methanation of CO2 Using Dual-Function Materials (DFMs)

“…Finally, Jo et al [22] used a simple Ni/CaO catalyst-sorbent, prepared by the citrate sol-gel method. The addition of the Ni phase over the CaO sorbent facilitated its regeneration and CH4 production under H2 flow at temperatures lower than the ones needed for the decarbonization of CaCO3.…”

Hydrogenation of carbon dioxide (CO2) to fuels in microreactors: a review of set-ups and value-added chemicals production

“…14 Consequently, CO 2 can be hydrogenated to methane (CH 4 ), methanol (CH 3 OH), ethanol (C 2 H 5 OH), lower olefins, dimethyl ether (DME) and higher hydrocarbons. 15,16 A scheme of the main products of CO 2 hydrogenation can be seen in Fig. 2.…”