High catalytic performances of low rank coal chars in ammonia decomposition at high temperatures

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)304-305
Journal / PublicationACS Division of Fuel Chemistry, Preprints
Volume48
Issue number1
Publication statusPublished - Mar 2003
Externally publishedYes

Conference

TitleProceedings of the 2003 SPE/EPA/DOE Exploration Production Environmental Conference
PlaceUnited States
CitySan Antonio, TX
Period10 - 12 March 2003

Abstract

To develop a novel hot gas cleanup method to efficiently remove heteroatom compounds from coal gasification products is important to achieve high power-generation efficiency in integrated gasification combined cycle technologies. Some chars prepared from low rank coals worked efficiently as the catalysts for decomposition at 750°C of 2000 ppm NH3 diluted with helium. The presence of fine particles of metallic iron and CaOx, formed from Fe and Ca ions naturally present in low rank coals, accounted for such catalytic performances. A stronger correlation between NH3 conversion to N2 and Fe content in characteristic was observed. The char with the largest content of 2 wt % iron showed the stable activity during 25 hr reaction and achieved complete decomposition of NH3 at 850°C. NH3 conversion increased with increasing time on stream.

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