Selective oxidation of ammonia over Ru(0 0 0 1)

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Sónia Carabineiro (Author) Other; Matveev, AV (Author) Other; Gorodetskii, VV (Author) Other; Nieuwenhuys, BE (Author) Other

Journal

Title: Surface Science

Vol. 555

Pages: 83-93

ISSN: 0039-6028

Publisher: Elsevier

Indexing

Scopus - 14 Citations

Other information

Authenticus ID: P-008-PAZ

DOI: 10.1016/j.susc.2004.02.022

Abstract (EN): The decomposition and oxidation of NH3 have been studied on the Ru(0001) surface in the temperature range from 150 up to 800 K. The results were compared to those found for Ir(110) and Ir(510). TDS results showed that most of the ammonia is dissociatively adsorbed between 150 and 300 K, with formation of H2 around 300 K and N2 between 600 and 800 K. N 2 desorption shifts to lower temperatures with increasing surface oxygen coverage. The products of ammonia oxidation observed were N2, H2O and N2O. Formation of NO was not found. Inhibition of the reaction presumably by N species was observed until 450 and 670 K, depending on the NH3/O2 ratios. Above those temperatures the reaction started as manifested by a decrease in the NH3 and O 2 pressures and a simultaneous increase in the H2O, N 2 and N2O pressures.

Language: English

Type (Professor's evaluation): Scientific