Comparison of 18O Isotopic Exchange After and During the Interaction of N2O, NO and NO2 with Fe Ions in Ferrierites

0181735 - UFCH-W 20030169 RIV NL eng J - Journal Article
Nováková, Jana - Sobalík, Zdeněk
Comparison of 18O Isotopic Exchange After and During the Interaction of N2O, NO and NO2 with Fe Ions in Ferrierites.
Catalysis Letters. Roč. 89, 3/4 (2003), s. 243-247. ISSN 1011-372X. E-ISSN 1572-879X
R&D Projects: GA AV ČR IBS4040016; GA MŠMT OC D15.20
Institutional research plan: CEZ:AV0Z4040901
Keywords : Fe-ferrierite * N oxides * 18O2 exchange
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.581, year: 2003

The isotopic exchange of 18O2 (IE) differs for individual N oxides: the IE at room temperature proceeds only after the interaction with N2O and corresponds to the single exchange mechanism; no IE was found at room temperature after the interaction with NO or with NO2. The same single-step mechanism operates during the interaction of N2O + 18O2 mixture at 200 oC. The IE also proceeds with the mixtures of NO + 18O2 and NO2 + 18O2 at higher temperatures (200 ů 250 oC), but the multiple-step mechanism fits in better with experimental results. Zeolitic oxygens participate in the IE above 250 oC during temperature programmed desorption of surface species formed by the interactions of all NO oxides with 18O2.
Permanent Link: http://hdl.handle.net/11104/0078261