Unravelling the effect of H2O and O2 in flue gas on Integrated carbon capture and dry reforming of methane

Abstract

Integrated carbon capture and utilization by dry reforming of methane (ICCU-DRM) is an efficient technology for concentrating and utilizing diluted CO2 from flue gas. Significant progresses have been made in developing efficient adsorption-catalytic dual functional materials (DFMs) for ICCU-DRM. However, reaction characteristics are mainly obtained under the idealized flue gas, disregarding the presence of H2O and O2 in industrial flue gases, which may lead to notable distinctions on ICCU-DRM reactions. Herein, reaction characteristics of ICCU-DRM with the presence of single steam or O2 and their coexistence in flue gas are comprehensively investigated using a Ni-CaO DFM. Results show that steam promotes the cladding effect of CaO on catalyst, resulting in the delay of in-situ DRM. Meanwhile, the oxidation of DFM by O2 deactivates the catalyst in DFM, and the increase of O2 concentration in flue gas leads to an aggravated deactivation. With the presence of both steam and O2 in the flue gas, the delayed in-situ DRM is intensified, and O2 dominates the negative effect.