2026/03/17 by Yiran Zhang, Fudong Wang, Cheng Chen +7 · 1 voice
Chemical Engineering · Engineering · #Carbon Dioxide Capture Technologies #Catalysts for Methane Reforming #Chemical Looping and Thermochemical Processes
paper · doi:10.1021/acssuschemeng.6c00380
openalex publication_date 2026/03/17 · openalex created_date 2026/03/18 · openalex updated_date 2026/06/14
This study develops CaZr-based dual-functional materials (DFMs) for integrated direct air capture (DAC) and an in situ reverse water–gas shift (RWGS) reaction, termed IDACU-RWGS. The baseline CaZr material, composed of Ca(OH) 2 and ZrO 2, exhibited limited CO 2 conversion efficiency. To address this, six non-noble metal catalysts (K, Ce, Co, Cu, Ni, and Fe) were screened, with Fe identified as the optimal single catalyst due to its ability to enhance CO 2 capture and conversion while maintaining 100% CO selectivity via a redox mechanism. In contrast, Ni improved capture and conversion but favored methanation, resulting in low CO selectivity. A bimetallic Fe–Ni catalyst system was subsequently designed to combine the advantages of both metals. The optimized CaZrFe 2 Ni 1 DFM demonstrated good performance at 650 °C, achieving a CO 2 capture capacity of 8.33 mmol/g, CO 2 conversion of 83.4%, CO selectivity >99%, and stable performance over five cycles with minimal degradation. Characterization results (XRD, SEM, BET, CO 2 -TPD, H 2 -TPR, and XPS) revealed that the incorporation of Fe and Ni promotes the formation of oxygen vacancies and enhances CO 2 activation. This work presents a promising DFM strategy for efficient and selective integrated DAC and RWGS conversion.