Adsorption and reaction of molecules of nitrogen oxide (NO) on the surface of nickel nano-sized clusters on aluminium oxide α-Al2O3(0001)

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Abstract

Adsorption and reaction of nitrogen oxide (NO) molecules on the surface of a model metal-oxide system formed by controlled deposition of nickel clusters under ultrahigh vacuum conditions on the surface of α-Al2O3(0001) aluminum oxide thin film grown on the Mo(110) substrate is studied in-situ by experimental surface analysis methods. According to X-ray photoelectron and electron Auger spectroscopy, infrared Fourier spectroscopy, and temperature-programmed desorption data, there is a conditional Ni cluster size of 2 nm that separates the nature of the electronic state of NO molecules adsorbed on their surface and their reactivity. It is found that the peculiarity of Ni clusters with a characteristic size not exceeding 2 nm is that NO molecules are adsorbed on their surface in the form of dimers (NO)2 while for clusters of larger size adsorption occurs in the form of monomers (NO). It is concluded that this difference is the reason for the different reaction behavior of the molecules. The key difference between clusters smaller and larger than 2 nm in size is that in the former case N2O molecules are formed upon heating the system and desorbed into the gas phase while this does not occur in the latter case. The formation of N2O is due to the mutual influence of NO molecules forming the (NO)2 dimer under the action of the metal/oxide interface. The results indicate that it is possible to tune the catalytic efficiency of the metal-oxide system by varying the size of the applied metal cluster.

About the authors

T. T. Magkoev

North Ossetian State University named after K. L. Khetagurov

Email: t_magkoev@mail.ru
Vladikavkaz, 362025 Russia

N. E. Pukhaeva

North Ossetian State University named after K. L. Khetagurov

Vladikavkaz, 362025 Russia

Y. Men

School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science

Shanghai, 201620 PR China

R. Behjatmanesh-Ardakani

Department of Chemical Engineering, Faculty of Engineering, Ardakan University

P.O. Box 184, Ardakan, IR Iran

M. Elahifard

Department of Chemical Engineering, Faculty of Engineering, Ardakan University

P.O. Box 184, Ardakan, IR Iran

O. G. Ashkhotov

Kh. M. Berbekov Kabardino-Balkarian State University

Nalchik, 360004 Russia

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