Efficient Calcium Looping-Integrated Methane Dry Reforming by Dual Functional Aerosol Ca–Ni–Ce Nanoparticle Clusters

Abstract

Calcium looping (CaL) integrated with methane dry reforming (DRM) shows promise for carbon capture and utilization. To enhance the CaL− DRM tandem processes, a raspberry-structured aerosol dual-functional material composed of CaO (CO 2 adsorbent), Ni (DRM catalyst), and CeO 2 (promoter) was fabricated via gas-phase evaporation-induced self-assembly. The utilization of Ca−Ni−Ce is highly beneficial by the creation of metal−support−promoter interaction for promoting an effective carbon capture followed by interfacial catalysis, providing an alternative pathway with enhanced redox ability and reduction of activation energy. The Ca−Ni−Ce composite materials with clustered particle characteristics showed great improvement in the performance of cyclic CaL−DRM in comparison to the reported values: low required carbonation/decarbonation temperatures (400/600 °C), high CO 2 uptake efficiency (12.1 mmol COd 2 /g CaO ), ultrahigh CO 2 conversion (97.2%) under relatively low-temperature operation (600 °C), and sufficiently high operational stability. Overall, the proposed Ca−Ni−Ce hybrid material fabricated via the aerosol synthetic method demonstrates significant advances in the low-temperature CaL−DRM processes, showing promise as a sustainable chemical engineering route for industrial applications.

Exploring the Challenges of Calcium Looping Integrated with Methane Bireforming for Enhanced Carbon Capture and Utilization

“…Among the various CCU technologies, calcium looping (CaL) has emerged as one of the most prominent techniques. Calcium looping utilizes the reversible reaction between calcium oxide (CaO) and CO 2 , enabling the cyclic capture and release of CO 2 – CaO ( s ) + CO 2 ( g ) ↔ CaCO 3 ( s ) …”

“…Previous studies have successfully investigated the integration of CaL with different reactions, such as methane dry reforming (DRM), to simultaneously capture CO 2 and produce valuable synthesis gas – , CaCO 3 ( s ) + CH 4 ( g ) ↔ CaO ( s ) + 2 H 2 ( g ) + 2 normalC normalO ( g ) Hu et al successfully achieved an isothermal CaL-DRM process using a single reactor, demonstrating robust cyclic performance under thermodynamically unfavorable conditions [i.e., very low CO 2 concentration (5 vol %) and high operating temperature (720 °C)] . Tian et al achieved an average cyclic CO 2 capture efficiency of 65% and methane conversion of 86% through the CaL-DRM approach.…”

“…In CaL-integrated processes, the development of a dual functional material (DFM) plays a crucial role in achieving enhanced performance. – The incorporation of both an adsorbent (i.e., CaO) for effective CO 2 capture and an active metal (i.e., Ni) for the CO 2 conversion enables a synergistic approach that facilitates simultaneous CO 2 capture and methane reforming in a single material. ,,,, The use of nickel as the active metal is particularly advantageous over noble metals, making it a more economically viable choice for large-scale industrial applications. ,, To further enhance the material performance, the involvement of a promoter is often implemented. In this case, the addition of CeO 2 serves to improve the redox properties of the material, facilitating the activation of both CO 2 and CH 4 during the CO 2 capture step and the reforming step, respectively. ,, Additionally, enhancing the interfaces of DFM is of paramount importance.…”

“…Building upon the success of our previous works, , which focused on the integration of calcium looping with DRM (CaL-DRM), the present study aims to explore the novel integration of calcium looping with methane bireforming (CaL-BRM) CaCO 3 ( s ) + 3 CH 4 ( g ) + 2 H 2 normalO ( g ) ↔ CaO ( s ) + 8 H 2 ( g ) + 4 normalC normalO ( g ) Although significant attention has been given to different CaL-integrated processes, the combination of methane bireforming with CaL has not been thoroughly explored. Hence, this study represents a significant step forward in the advancement of CCU technologies.…”

Crystal Face Effects in Ni-Catalyzed Biomimetic Carbon Dioxide Hydration

“…Development of carbon-neutral energy systems for a sustainable future has become imperative in light of the increased CO 2 concentration in the atmosphere from the use of conventional fuels. Until such time comes as the fossil fuel-based energy systems are replaced by nonconventional ones, CO 2 capture seems to be the only way to address this issue. – CO 2 capture methods primarily include precombustion capture, postcombustion capture, oxy-combustion capture, and calcium chemical looping. – Catalytic conversion of CO 2 to carbonates offers a promising solution to the aforementioned energy and environmental issues. The synthesis of mineral bicarbonates from CO 2 has received considerable attention in the recent past. – Carbonic anhydrases, as biocatalysts, are highly efficient naturally occurring carbon capture enzymes which are selective toward the CO 2 hydration reaction (CO 2 + H 2 O ⇌ HCO 3 – + H + ).…”