Effect of CaO-modified hematite oxygen carrier on syngas production from chemical looping gasification of kitchen waste

作者：Haoran Jia, Shanchen Li, Fanrui Meng, Shuai Chen, Kangzhe Si, Peiyao Huo · 发表于：Energy Sources Part A Recovery Utilization and Environmental Effects · 年份：2026 · DOI：10.1080/15567036.2026.2665727 · 研究领域：Chemical Looping and Thermochemical Processes、Iron and Steelmaking Processes、Adsorption and Cooling Systems

Chemical looping gasification (CLG) is a highly promising technology, yet its application in the field of high-quality syngas production from food waste remains to be further explored. In this study, wheat flour (starch-based), chicken breast (protein-based), and lard (lipid-based) were selected as typical model compounds of food waste, and calcium oxide-modified hematite (FC4) was employed as the oxygen carrier, with relevant experiments conducted in a fixed-bed reactor. The results demonstrated that, due to the significant differences in component characteristics, the quality of syngas produced from starch-based and lipid-based food waste was significantly superior to that from protein-based food waste, whose high nitrogen and high ash characteristics readily cause coverage of the active sites of the oxygen carrier. When the mass ratio of wheat flour to oxygen carrier was 1:6, and the reaction temperature was 850 °C, the production performance of hydrogen and carbon monoxide reached the optimal level, with the maximum effective gas yield per unit raw material reaching 358 mL/g. The oxygen carrier maintained more than 85% of its reaction activity after 10 redox cycles. The formation of the calcium‒iron composite oxide (Ca2Fe2O5) crystal phase effectively alleviated the sintering phenomenon of the oxygen carrier via the lattice confinement effect, thus improving its cycling stability. Density functional theory (DFT) calculation results showed that the adsorption energies of h...