Absorption of NO and CO over transition-metal-incorporated mesoporous catalytic materials

Bhargava, S and Akolekar, D 2005, 'Absorption of NO and CO over transition-metal-incorporated mesoporous catalytic materials', Journal of Colloid and Interface Science, vol. 281, pp. 171-178.


Document type: Journal Article
Collection: Journal Articles

Title Absorption of NO and CO over transition-metal-incorporated mesoporous catalytic materials
Author(s) Bhargava, S
Akolekar, D
Year 2005
Journal name Journal of Colloid and Interface Science
Volume number 281
Start page 171
End page 178
Total pages 7
Publisher Academic Press
Abstract Novel high-surface-area mesoporous catalysts of type Al-MCM-41 containing transition metals such as iron, nickel, cobalt, zinc, copper, and cobalt were prepared and characterized using techniques such as BET, FTIR, ICP-MS, XPS, and XRD. The XPS measurements indicated that the transition-metal particles are located in the bulk or pore channels of the Al-MCM-41 materials. A detailed in situ FTIR investigation undertaken on the adsorption and disproportionation of NO and CO over the transition-metal-Al-MCM-41 mesoporous catalysts indicated the formation of various NO/CO species or complexes with active metal sites. The structure and dynamics of the metal activated complex and reactive species formed during the CO/NO reaction together with advantages of these catalysts and the influence of reaction temperature and pressure have been studied. NO adsorption at room temperature leads to the formation of adsorbed N2O, NO2, M-NO2, M-NO, and [M-(NO)(2)] complexes. CO adsorption at room temperature leads to the formation of physisorbed carbon dioxide and cationic Lewis acid carbonyl moieties as well as transition-metal carbonyl complexes. The copper mesoporous catalysts prepared by different procedures (ion exchanged and as-synthesized) were compared for their interactions with CO and NO probe molecules.
Subject Colloid and Surface Chemistry
Keyword(s) FTIR
NO
CO
transition metal
MCM-41
Zn
Ni
Fe
Co
Cu
active metal sites
XPS
DOI - identifier 10.1016/j.jcis.2004.08.021
Copyright notice Copyright © 2004 Elsevier Inc. All rights reserved.
ISSN 0021-9797
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