Sulfur poisoning of nickel-based hot gas cleaning catalysts in synthetic gasification gas

Jouko Hepola, Pekka Simell

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    5 Citations (Scopus)

    Abstract

    The sulfur distribution and content of nickel catalyst beds were analyzed to account for poisoning effects of sulfur on the activities of catalysts which decompose tar, ammonia and methane in synthetic gasification gas. The desorption behavior of chemisorbed sulfur from the bed materials was monitored by temperature programmed hydrogenation (TPH). Sulfur adsorbs on nickel catalysts in different chemical states depending on the process conditions. At >900°C the sulfur adsorbs on the catalyst forming an irreversible monolayer on catalyst surfaces, while at <900°C adsorbed sulfur, probably composed of polysulfides (multilayer sulfur), is desorbed from the catalyst in a sulfur-free hydrogen-containing atmosphere. However, a monolayer of sulfur still remains on the catalyst after desorption. The enhanced effect of high pressure on sulfur-poisoning of nickel catalysts can be attributed to an increased amount of adsorbed sulfur, probably in the form of polysulfides. In addition, it was established that bulk nickel sulfide is active in decomposing ammonia in high-temperature gasification gas-cleaning conditions. The activity for decomposing methane is not affected by bulk nickel sulfide formation, but that of toluene is decreased.
    Original languageEnglish
    Title of host publicationCatalyst deactivation
    Subtitle of host publicationProceedings of the 7th International Symposium
    EditorsC.H. Bartholomew, G.A. Fuentes
    Place of PublicationAmsterdam
    PublisherElsevier
    Pages471-478
    ISBN (Print)978-0-444-82603-9
    DOIs
    Publication statusPublished - 1997
    MoE publication typeA4 Article in a conference publication
    Event7th International Symposium on Catalyst Deactivation - Cancun, Mexico
    Duration: 5 Oct 19978 Oct 1997

    Publication series

    SeriesStudies in Surface Science and Catalysis
    Volume111
    ISSN0167-2991

    Conference

    Conference7th International Symposium on Catalyst Deactivation
    CountryMexico
    CityCancun
    Period5/10/978/10/97

    Keywords

    • gasification

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