CUED Publications database

The production of separate streams of pure hydrogen and carbon dioxide from coal via an iron-oxide redox cycle

(2011) The production of separate streams of pure hydrogen and carbon dioxide from coal via an iron-oxide redox cycle. Chemical Engineering Journal, 166. pp. 1052-1060. ISSN 1385-8947

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Abstract

A chemical looping process using the redox reactions of iron oxide has been used to produce separate streams of pure H 2 and CO 2 from a solid fuel. An iron oxide carrier prepared using a mechanical mixing technique and comprised of 100wt.% Fe 2 O 3 was used. It was demonstrated that hydrogen can be produced from three representative coals - a Russian bituminous, a German lignite and a UK sub-bituminous coal. Depending on the fuel, pure H 2 with [CO] ≲50vol.ppm can be obtained from the proposed process. The cyclic stability of the iron oxide carrier was not adversely affected by contaminants found in syngas which are gaseous above 273K. Stable quantities of H 2 were produced over five cycles for all three coals investigated. Independent of the fuel, SO 2 was not formed during the oxidation with steam, i.e. the produced H 2 was not contaminated with SO 2 . Since oxidation with air removes contaminants and generates useful heat and pure N 2 for purging, it should be included in the operating cycle. Overall, it was demonstrated that the proposed process may be an attractive approach to upgrade crude syngas produced by the gasification of low-rank coals to pure H 2 , representing a substantial increase in calorific value, whilst simultaneous capturing CO 2 , a greenhouse gas. © 2010 Elsevier B.V.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 17 Aug 2017 01:24
DOI: