出版社：Chinese Association for Aerosol Research in Taiwan
摘要：Iron-based oxygen carriers supported on alumina or alumina/titania were fabricated andevaluated for chemical looping combustion of isopropanol (IPA). Hydrogen is the major combustiblegas generated by IPA decomposition prior to combustion with oxygen carriers at temperaturesabove 800°C. Nearly complete combustion (above 95%) of IPA was achieved for experimentsconducted with fabricated Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 operated at lower inlet IPA flowrates. Carbon deposition during the chemical looping combustion of IPA was minimized usingFe2O3/Al2O3/TiO2 as an oxygen carrier. The reduction of Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 byhydrogen was markedly increased with increasing inlet hydrogen concentration (5–20%), andwas not obviously influenced by operating temperature (875–925°C). According to the shrinkingcore model, the mass transfer coefficients (kg) of Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 reductionwith H2 were found to be 0.22 and 0.24 mm s–1, while the effective diffusion diffusivity (De) ofFe2O3/Al2O3 oxygen carriers was more easily depended on the oxygen carrier conversion. Thehigher reduction conversions obtained for experiments conducted with Fe2O3/Al2O3/TiO2because it can be further reduced to FeO and Fe; comparing to those with Fe2O3/Al2O3, which isprimarily reduced to FeO. Hydrogen molecules are found to diffuse more easily through the FeOproduct-layer on Fe2O3/Al2O3 than the FeO/Fe product-layer on Fe2O3/Al2O3/TiO2.
关键词：Chemical looping;Isopropanol;Reaction kinetics;Hydrogen;Fe2O3;Al2O3;Fabricated;Moving bed reactor
