Regenerable MgO-based sorbent for high temperature CO2 removal from syngas: 3. CO2 capture and sorbent enhanced water gas shift reaction

Abstract

Regenerable MgO-based sorbent, which was prepared and evaluated in the thermogravimetric analyzer (TGA) in part 1, was also evaluated in high-pressure packed-bed unit in CO 2 /N 2 /H 2 O mixture and simulated pre-combustion syngas environment. In CO 2 /N 2 /H 2 O environment, The CO 2 absorption capacity of the sorbent increases with increasing temperatures from 6.7% at 350°C to 9.5% 450°C. The sorbent is capable of achieving over 95% CO 2 capture and 40% conversion in the WGS reaction, which should be attributed to positive effect of WGS reaction in producing CO 2 during the process. The sorbent reactivity and absorption capacity toward CO 2 , as well as its WGS catalytic activity decreases with increasing temperature. The maximum prebreakthrough WGS conversion occurs at 350°C, which diminishes as the sorbent is carbonated. The variable diffusivity shrinking core reaction model coupled with the two-fluid CFD model was shown to accurately predict the breakthrough gas compositions at different operating conditions.

Hydrothermal Fabrication of High Specific Surface Area Mesoporous MgO with Excellent CO2 Adsorption Potential at Intermediate Temperatures

“…Figure 8b indicated that the CO 2 capture capacity of the SDS-assisted MgO sample eventually reaches a steady value of 0.5 mmol g −1 without further significant degradation, suggesting a great prospect of application in the sorption-enhanced hydrogen production processes [49,50].…”

Solid sorbents for in-situ CO 2 removal during sorption-enhanced steam reforming process: A review

“…Abbasi et al studied regenerable MgO-based sorbent in CO 2 /N 2 / H 2 O environment, and the results showed that CO 2 sorption capacity of the sorbent increases with increasing temperatures from 6.7% at 350°C to 9.5% at 450°C. The MgO-based sorbent is capable of achieving over 95% CO 2 capture and 40% conversion in the water gas shift (WGS) reaction [67]. The regeneration reaction can be performed either at temperatures higher than the reaction temperatures or at lower pressures in a CO 2 -free atmosphere.…”

CFD–PBE numerical simulation of CO2 capture using MgO-based sorbent

“…This code calculates the overall rate of reaction based on eq.9 and eq.10 and provides the source term (R j ) in the species conservation equations (T-6 and T-7). The model has been validated against TGA and packed bed experimental data in previous studies (Abbasi et al, 2013;Abbasi et al, 2014).…”

“…The coupled method is based on the -Finite size domain Complete set of trial functions Method of Moment‖ (FCMOM) (Abbasi and Arastoopour, 2013). Another objective of this paper is to numerically assess the performance of the MgO-based sorbent 2014) in the proposed regenerative carbon dioxide capture and SEWGS process.For this purpose, we adopted a bench scale circulating fluidized bed reactor design from the National Energy Technology Laboratory (NETL) as our baseline (Breault et al, 2013;Clark et al, 2013). 5…”