Prussian blue derived Ca-Fe bifunctional materials for chemical looping CO2 capture and in-situ conversion

作者：Bo Jin, Tong Ouyang, Zhineng Zhang, Zhineng Zhang, Yunlei Zhao, Haiyan Zhang, Wenxing Yao, Guiqiu Huang, Zhiwu Liang · 发表于：Separation and Purification Technology · 年份：2023 · DOI：10.1016/j.seppur.2023.123975 · 被引用次数：51 · 研究领域：Chemical Looping and Thermochemical Processes、Carbon Dioxide Capture Technologies、Catalysis and Oxidation Reactions

Chemical looping CO 2 capture and in-situ reverse water gas shift (CL-ICCC-RWGS) is a promising way to realize integrated CO 2 capture and conversion for responding CO 2 emission issue. Most bifunctional materials are performed in a reaction configuration of sorbent-catalyst, however, altering the reaction configuration into a sorbent-oxygen-carrying form by introducing a redox couple would result in a new CL-ICCC-RWGS scheme. In this work, a new integrated CO 2 capture and conversion scheme is proposed and experimentally demonstrated by synthesizing a series of Prussian blue derived Ca-Fe bifunctional materials with varying iron loadings and exploring their cyclic capture-conversion reactivity. The bifunctional materials with both Ca and Fe species show CO production during isothermal cycles, since CO 2 re-oxidation of metallic iron and reverse water gas shift occur in capture and conversion half-cycles, respectively. FCZ136 exhibits the best averaged CO space time yield (238.25 mmol CO ∙s −1 ∙kg Fe2O3 −1 and 3.00 mmol CO ∙s −1 ∙kg CaO −1 ) and CO yield (142.95 mol CO ∙kg Fe2O3 −1 and 1.80 mol CO ∙kg CaO −1 ) with no deactivation after ten isothermal cycles at 650 °C. This is mainly ascribed to two aspects: (i) high iron dispersion improves CO generation rate, (ii) the presence of two inert promoters (t-ZrO 2 and CaZrO 3 ) maintains a superior stability. The result provides a new strategy to design efficient bifunctional material and achieve integrated CO 2 capture and conve...