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Nitrous oxide adsorption on DeNOx-ing catalysts

Technical Report:

Abstract

The adsorption of N/sub 2/0 in the temperature range 150-650 degrees K was investigated over model active and deactivated de-NO-ing catalysts. Powders having the compositions TiO/sub 2/, V/TiO/sub 2/, W/TiO/sub 2/, K-V/TiO/sub 2/ and K-W/TiO/sub 2/ were taken into account. Molecular adsorption by coordination over surface cations through both the N- and the 0- end of the N/sub 2/O molecule was observed in all cases. The vibrational perturbation depends on the Lewis acid strength of the surface cations. These species are reversible at r.t. by short evacuation. Pre-adsorption of water and ammonia poisons the adsorption sites for N/sub 2/O, due to the much stronger basicity of these molecules. Evidence of the reaction of N/sub 2/O with adsorbed ammonia on V/TiO/sub 2/ is found only at 623 degrees K, unlike that for NO which oxidizes NH/sub 3/ starting already from 423 degrees K.
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
ENEL-CRTN-T6-91-05
Reference Number:
SCA: 200202; 010800; 020800; PA: ITA-92:001495; SN: 93000910609
Resource Relation:
Other Information: PBD: 1991
Subject:
20 FOSSIL-FUELED POWER PLANTS; 01 COAL, LIGNITE, AND PEAT; 02 PETROLEUM; NITROGEN OXIDES; ADSORPTION; REDUCTION; CATALYSTS; OXIDATION; TITANIUM OXIDES; DENITRIFICATION; AMMONIA; TEMPERATURE DEPENDENCE; DOPED MATERIALS; CHEMICAL REACTION KINETICS; 200202; 010800; 020800; NOXIOUS GAS AND PARTICULATE EMISSIONS; WASTE MANAGEMENT
OSTI ID:
10107207
Research Organizations:
Genoa Univ. (Italy). Ist. di Chimica Generale; Ente Nazionale per l`Energia Elettrica, Milan (Italy). Centro Termica e Nucleare
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Other: ON: DE93748425; TRN: 92:001495
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ITA
Size:
27 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ramis, G, Busca, G, and Bregani, F. Nitrous oxide adsorption on DeNOx-ing catalysts. Italy: N. p., 1991. Web.
Ramis, G, Busca, G, & Bregani, F. Nitrous oxide adsorption on DeNOx-ing catalysts. Italy.
Ramis, G, Busca, G, and Bregani, F. 1991. "Nitrous oxide adsorption on DeNOx-ing catalysts." Italy.
@misc{etde_10107207,
title = {Nitrous oxide adsorption on DeNOx-ing catalysts}
author = {Ramis, G, Busca, G, and Bregani, F}
abstractNote = {The adsorption of N/sub 2/0 in the temperature range 150-650 degrees K was investigated over model active and deactivated de-NO-ing catalysts. Powders having the compositions TiO/sub 2/, V/TiO/sub 2/, W/TiO/sub 2/, K-V/TiO/sub 2/ and K-W/TiO/sub 2/ were taken into account. Molecular adsorption by coordination over surface cations through both the N- and the 0- end of the N/sub 2/O molecule was observed in all cases. The vibrational perturbation depends on the Lewis acid strength of the surface cations. These species are reversible at r.t. by short evacuation. Pre-adsorption of water and ammonia poisons the adsorption sites for N/sub 2/O, due to the much stronger basicity of these molecules. Evidence of the reaction of N/sub 2/O with adsorbed ammonia on V/TiO/sub 2/ is found only at 623 degrees K, unlike that for NO which oxidizes NH/sub 3/ starting already from 423 degrees K.}
place = {Italy}
year = {1991}
month = {Dec}
}