Selective oxidation of ammonia over Ir(5 1 0). Comparison with Ir(1 1 0)

• Type: Article in International Conference Proceedings Book
• Date: 2003

Authors

Sónia Carabineiro (Author) Other; Nieuwenhuys, BE (Author) Other

Conference proceedings International

Title: Surface Science

Pages: 87-95

Proceedings of the 7th International Conference on Nanometer

Malmo, 29 August 2002 through 31 August 2002

Indexing

Scopus - 17 Citations

Other information

Authenticus ID: P-008-PB1

DOI: 10.1016/s0039-6028(03)00085-2

Abstract (EN): The decomposition and oxidation of NH3 have been studied on the Ir(5 1 0) surface in the temperature range from 300 K up to 800 K. Decomposition of NH3 at room temperature and combination of N-atoms to form N2 was observed. The products of ammonia oxidation were N2 and H2O. NO and N2O were not observed. Inhibition of the reaction by N species seems to exist until a certain temperature (between 400 and 500 K, depending on the NH3/O2 ratio). Above those temperatures the reaction starts as manifested by a decrease in NH3 and O2 pressures and a simultaneous increase in H2O and N2 pressures. Reaction orders with respect to NH3 and O2 were found to have values between 0.5 and 0.7. A comparison with previous results obtained on the Ir(1 1 0) surface is made.

Language: English

Type (Professor's evaluation): Scientific