Direct observation of atomically-resolved silver species on a silver alumina catalyst active for selective catalytic reduction of nitrogen oxides
Journal article, 2019

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.

Reduction

Ammonia

Sol-gels

Ultraviolet visible spectroscopy

Catalysts

Aluminum oxide

Sol-gel process

Author

Hannes Kannisto

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Applied Surface Chemistry

Magnus Skoglundh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Kalle Arve

Åbo Akademi

Eva Olsson

Chalmers, Physics, Eva Olsson Group

Hanna Härelind

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Pharmaceutical Technology

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 9 22 6213-6216

Subject Categories

Inorganic Chemistry

Materials Chemistry

Organic Chemistry

DOI

10.1039/c9cy00940j

More information

Latest update

11/26/2019