Abstract
On the basis of a chemical looping combustion (CLC) process with adding a step of CH4 steam reforming, the influences of the preparation method, inert support of SiO2 or Al2O3, Ni component, particle size, and gas hourly space velocity (GHSV) on the redox performance of a Cu-based oxygen carrier (OC) were investigated. Results showed that the OC prepared with impregnation was able to react completely with H2 in reduction or O2 in oxidation but had a relatively low oxygen content ratio (Ro) because of the limitation from saturation loading of an active component. In contrast, the OC prepared with mechanical mixing had a high Ro as well as high reactivity. The inert support was able to inhibit the sintering of the OC through dispersing the active component. Methanation and reverse CO–water shift reactions occurred in the reduction step, where metallic Cu played the role of a catalyst. The utilization ratios of the OC for both reduction and oxidation increased as the size of the active component particle dec...
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