Strong size effects in supported ionic nanoparticles: Tailoring the stability of NOx storage catalysts
Desikusumastuti A, Laurin M, Happel M, Qin Z, Shaikhutdinov S, Libuda J (2008)
Publication Status: Published
Publication Type: Journal article
Publication year: 2008
Journal
Publisher: SPRINGER
Book Volume: 121
Pages Range: 311-318
Journal Issue: 3-4
DOI: 10.1007/s10562-007-9340-1
Abstract
Based on a well-defined model-catalyst approach, we study the particle size dependent properties of NO (x) storage materials. The single-crystal based model systems are prepared on an ordered Al2O3 film, on which BaO nanoparticles are grown under ultrahigh-vacuum (UVH) conditions. Particle size and density are characterized by scanning tunneling microscopy (STM). The interaction with NO2 is probed by molecular beam (MB) methods in combination with time-resolved IR reflection absorption spectroscopy (TR-IRAS). It is found that both, the stability and the formation kinetics of alumina supported barium nitrate nanoparticles show a strong dependence on particle size. Very small BaO particles are rapidly converted into nitrates, however, the resulting aggregates exhibit a strongly reduced thermal stability. Surface and bulk nitrate and nitrate features are identified by means of vibrational spectroscopy. It is concluded that the size dependencies are related to the formation and decomposition of surface-related BaNO (x) species the decomposition temperature of which can be tuned over an exceptionally large temperature interval. It is suggested that the stability of these surface NO (x) species is strongly modified by the underlying support.
Authors with CRIS profile
Mathias Laurin
Lehrstuhl für Physikalische Chemie II
Markus Happel
Lehrstuhl für Physikalische Chemie II
Jörg Libuda
Professur für Physikalische Chemie
Involved external institutions
Germany (DE)How to cite
APA:
Desikusumastuti, A., Laurin, M., Happel, M., Qin, Z., Shaikhutdinov, S., & Libuda, J. (2008). Strong size effects in supported ionic nanoparticles: Tailoring the stability of NOx storage catalysts. Catalysis Letters, 121(3-4), 311-318. https://dx.doi.org/10.1007/s10562-007-9340-1
MLA:
Desikusumastuti, Aine, et al. "Strong size effects in supported ionic nanoparticles: Tailoring the stability of NOx storage catalysts." Catalysis Letters 121.3-4 (2008): 311-318.
BibTeX: Download