Direct observation of atomically-resolved silver species on a silver alumina catalyst active for selective catalytic reduction of nitrogen oxides

H Kannisto, M Skoglundh, Kalle Arve, E Olsson, H Härelind

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    Abstract

    We characterize the size and state of the silver species in a 2 wt% silver alumina catalyst, which is highly active for the selective catalytic reduction of nitrogen oxides with ammonia or hydrocarbons as reductant. The silver alumina catalyst is prepared by a single-step sol-gel method and characterized with X-ray photoelectron and ultraviolet-visible spectroscopy, and high-resolution transmission electron microscopy. We show, for the first time, direct observations of atomically-resolved silver species and silver clusters on the silver alumina catalyst. The results determine the existence of these silver species on the alumina support, which corroborate previously reported indirect observations, and strengthen the hypothesis of small silver clusters as active sites for the selective catalytic reduction of nitrogen oxides.
    Original languageUndefined/Unknown
    Pages (from-to)6213–6216
    Number of pages4
    JournalCatalysis Science and Technology
    Volume9
    Issue number22
    DOIs
    Publication statusPublished - 2019
    MoE publication typeA1 Journal article-refereed

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