DECOMPOSITION OF WATER-CONTAINING NITROUS-OXIDE GAS-USING RU AL2O3 CATALYSTS/

Authors
Citation
Xf. Wang et Hc. Zeng, DECOMPOSITION OF WATER-CONTAINING NITROUS-OXIDE GAS-USING RU AL2O3 CATALYSTS/, Applied catalysis. B, Environmental, 17(1-2), 1998, pp. 89-99
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Physical","Engineering, Environmental
Journal title
ISSN journal
0926-3373
Volume
17
Issue
1-2
Year of publication
1998
Pages
89 - 99
Database
ISI
SICI code
0926-3373(1998)17:1-2<89:DOWNGR>2.0.ZU;2-S
Abstract
Decomposition reaction of water-containing nitrous oxide has been carr ied out in a tubular quartz reactor with GC on low-metal content Ru/Al 2O3 catalyst (Ru 0.2 wt.%). Activation parameters of catalyst have bee n examined and two processes have been established using dry or wet N2 O (27-31 mol%) feed gases. After activation, N2O can be decomposed in water vapour (up to 3 mol%) under optimal operational conditions. It i s found that the effect of water is non-linear, and it can be signific antly reduced at high operating temperature. The rate law of N2O decom position in wet environment can be expressed as first order to partial pressure of nitrous oxide with an averaged apparent activation energy of 139 kJ/mol. Chemical composition, surface area and crystallographi c structure of catalyst have been investigated with ICP/BET/XRD/FTIR. The studied catalysts are both chemically and hydrothermally stable. H igh conversion activity [1.2x10(2) mmol (N2O)/g.h at 470.5 degrees C ( GHSV=14400 h(-1), N2O=29.9 mol%, H2O=3.0 mol%, balanced with He)] has been found and an operational process of the catalyst has also been pr oposed. (C) 1998 Elsevier Science B.V.