Journal
ENERGY & FUELS
Volume 24, Issue 8, Pages 4408-4418Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ef100346j
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Funding
- US Department of Energy [DE-FC26-03NT41853]
- Ohio Coal Development Office
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The calcium looping process (CLP) is one of the clean coal technologies being developed for the production of hydrogen (H-2) and electricity from coal-derived syngas. It integrates the water-gas shift reaction with in situ carbon dioxide (CO2), sulfur, and halide removal in a single-stage reactor. In the CLP, a regenerable calcium-based sorbent is used to react with and remove CO2, sulfur, and halide impurities from the synthesis gas during the production of H-2. The removal of CO2 creates a favorable equilibrium and drives the water gas shift reaction forward per Le Chatelier's principle enabling the production of high-purity H-2. In this investigation, the feasibility and optimum process conditions for the production of H-2 in the absence of a water gas shift catalyst have been described. Calcium oxide (CaO) sorbent has been found to enhance H-2 yield to a large extent even in the absence of a water-gas shift catalyst. Specifically, at high pressures, high carbon monoxide (CO) conversion and H-2 purity ( > 99%) have been obtained in the absence of a water-gas shift catalyst at near-stoichiometric steam to carbon (S:C) ratios.
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