Uncovering the Influence Mechanisms of H<sub>2</sub>O, O<sub>2</sub>, and NO<sub>2</sub> on CeNiCa Dual-Function Material for Integrated CO<sub>2</sub> Capture and In Situ Methanation
Linjia Li, Yiran Zhang, Jiaqi Feng, Shu Zhao, Wei Qiu, Ke Li, Zhen Huang, He Lin
Abstract
Derived from carbon capture, utilization, and storage (CCUS), integrated carbon capture and utilization (ICCU) has been widely developed recently. Understanding the influences of H 2 O, O 2, and NO 2 on dual-function materials (DFMs) performance is crucial for their practical application. In this study, the influence mechanisms of O 2, H 2 O, and NO 2 on CeNiCa DFM for ICCU-methanation are investigated. The catalyst was oxidized by O 2, H 2 O, and NO 2 . NO 2 competes with CO 2 for basic adsorption sites, inhibiting CO 2 adsorption and methanation, but adsorbed NO 2 is reduced mainly to N 2 and NH 3 during methanation. H 2 O induces agglomeration of the adsorbent and catalyst─the former due to the Ca(OH) 2 mobility, and the latter attributed to OH-promoted migration and agglomeration of Ni. On this basis, it is proposed that the dominant roles of H 2 O, O 2, and NO 2 change in two- and multi-interference components, but the joint effects among them should not be neglected.