Cooperative and Bifunctional Ga-Ca-Cr2O3@CaO Structured Monoliths as Versatile Platform for Reactive Capture of CO2 and its Subsequent Conversion to Ethylene

Author

Khaled Baamran
Ali A. Rownaghi, Missouri University of Science and TechnologyFollow

Abstract

Cooperative and bifunctional materials (BFMs) that integrate adsorbents and catalysts offer a promising strategy for the reactive capture of CO₂ to produce valuable fuels and chemicals. In this study, we developed structured BFMs via 3D printing that combine CaO as an adsorbent with Ga–Ca–Cr₂O₃ metal oxides as the catalyst for the reactive capture of CO₂ and its subsequent conversion to C₂H₄ via the oxidative dehydrogenation of C₂H₆ (CO₂-ODHE). Three different Ga–Ca compositions were used to modify the catalyst surface characteristics and enhance C₂H₄ selectivity. In these formulations, Ga ions stabilize the oxygen lattice of the BFM, while Ca ions interact strongly with Cr to form CaCrO₄, thereby altering the oxygen species and enhancing the material's basic properties. Under adsorption–reaction conditions at 600–650 °C, the optimal BFM achieved an excellent C₂H₄ selectivity of 96.4 %, attributed to a balanced redox process and improved basicity that facilitate efficient C₂H₆ conversion and rapid desorption of C₂H₄ without excessive oxidation. Overall, this work provides new insights into the formulation of BFMs monoliths and highlights the critical role of catalytic surface modification in enhancing C₂H₄ selectivity in the CO₂-ODHE reactive capture process.

Recommended Citation

K. Baamran and A. A. Rownaghi, "Cooperative and Bifunctional Ga-Ca-Cr2O3@CaO Structured Monoliths as Versatile Platform for Reactive Capture of CO2 and its Subsequent Conversion to Ethylene," Chemical Engineering Journal, vol. 511, article no. 161701, Elsevier, May 2025.

The definitive version is available at https://doi.org/10.1016/j.cej.2025.161701

Department(s)

Chemical and Biochemical Engineering

Publication Status

Full Text Access

Comments

U.S. Department of Energy, Grant None

Keywords and Phrases

C H production 2 4; Cooperative and bifunctional materials; Reactive CO capture 2; Structured adsorbent-catalyst monolith

International Standard Serial Number (ISSN)

1385-8947

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Elsevier, All rights reserved.

Publication Date

01 May 2025