A comparative study of the N2O-CO and N2O-H2 reactions on the Ir(110) surface with emphasis on the oscillatory behavior

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Sónia Carabineiro (Author) Other; Van Noort, WD (Author) Other; Nieuwenhuys, BE (Author) Other

Journal

Title: Catalysis Letters

Vol. 84

Pages: 135-142

ISSN: 1011-372X

Publisher: Springer Nature

Indexing

Scopus - 7 Citations

Other information

Authenticus ID: P-008-PB4

DOI: 10.1023/a:1021496424060

Abstract (EN): The N2O-CO reaction has been studied on the Ir(110) surface in the temperature range from 300 up to 800 K and compared with the N2O-H2 reaction on the same surface. At temperatures up to 550 K (depending on the N2O/reducing gas ratio), the reaction with H2 is faster due to CO inhibition of the reduction of N2O by CO. Isothermal sustained oscillations in rate were found in the temperature range from 373 to 377 K, for very low CO/N2O ratios. The reaction products are N2 and CO2. Interestingly, the reactant N2O oscillates in an almost counterphase with the other reactant, CO. The period is around 60 s; also, highly correlated, synchronous events were found in regular time intervals. A model for the rate oscillations involves periodic transitions between a CO-rich (inactive) and a CO-poor (active) surface. In contrast, the rate oscillations for the N2O-H2 reaction are related to periodic transitions between O-rich and O-poor surfaces.

Language: English

Type (Professor's evaluation): Scientific