Enhanced performance of chemical looping combustion of methane with Fe2O3/Al2O3/TiO2 oxygen carrier

Iron-based oxygen carriers supported on alumina or alumina/titania were prepared and evaluated for chemical looping combustion of methane. The reduction conversion of Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 particles was markedly increased with increasing inlet concentration and was slightly enhanced by el...

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Published in:RSC advances 2018-01, Vol.8 (70), p.39902-39912
Main Authors: Wu, Hsuan-Chih, Ku, Young
Format: Article
Language:English
Subjects:
Aluminum oxide
Chemistry
Fluidized bed combustion
Iron oxides
Mass transfer
Methane
Operating temperature
Organic chemistry
Oxygen
Performance enhancement
Reduction
Shrinking core model
Titanium dioxide
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Ku, Young
description Iron-based oxygen carriers supported on alumina or alumina/titania were prepared and evaluated for chemical looping combustion of methane. The reduction conversion of Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 particles was markedly increased with increasing inlet concentration and was slightly enhanced by elevated operating temperatures. According to the shrinking core model, the mass transfer coefficients (kg) of Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 reduction with methane are found to be 0.07 and 0.12 mm s−1. Complete combustion of methane is almost achieved for experiments conducted with Fe2O3/Al2O3 and Fe2O3/Al2O3/TiO2 operated as the Fe2O3/CH4 molar ratio reached about 5.4 and 4.4, respectively. Carbon deposition during methane combustion was avoided by using Fe2O3/Al2O3/TiO2 as an oxygen carrier. More heat was generated for the combustion of methane by Fe2O3/Al2O3/TiO2 oxygen carriers because methane more fully reacted with the Fe2O3 contained in the Fe2O3/Al2O3/TiO2 oxygen carriers.
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subjects Aluminum oxide
Chemistry
Fluidized bed combustion
Iron oxides
Mass transfer
Methane
Operating temperature
Organic chemistry
Oxygen
Performance enhancement
Reduction
Shrinking core model
Titanium dioxide
title Enhanced performance of chemical looping combustion of methane with Fe2O3/Al2O3/TiO2 oxygen carrier
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