Dependence of the catalytic activity of Ag/Al2O3 on the silver concentration in the selective reduction of NO x with n-hexane in the presence of H2

Dependence of the catalytic activity of Ag/Al2O3 on the silver concentration in the selective reduction of NO x with n-hexane in the presence of H2 Full article

Journal

Kinetics and Catalysis
ISSN: 1608-3210 , E-ISSN: 0023-1584

Output data

Year: 2012, Volume: 53, Number: 1, Pages: 107-116 Pages count : 10 DOI: 10.1134/s0023158412010090

Authors

Sadokhina N.A. ¹ , Prokhorova A.F. ³ , Kvon R.I. ² , Mashkovskii I.S. ¹ , Bragina G.O. ¹ , Baeva G.N. ¹ , Bukhtiyarov V.I. ² , Stakheev A.Yu. ¹

Affiliations

1	Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Leninskii pr. 47, 119991, Russia
2	Moscow State University, Moscow, 119991, Russia
3	Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

The activity of 0.25–5% Ag/Al2O3 catalysts in the selective catalytic reduction of nitrogen oxides with n-hexane under the conditions of promotion with a small amount of H2 was studied. It was found that, upon the introduction of ∼1000 ppm of H2 into the reaction mixture, the Ag/Al2O3 samples containing 1–2% Ag exhibited optimum activity and selectivity. It was established that, in the presence of 1000 ppm of H2, the rate of the selective catalytic reduction of NO x was higher by a factor of 10–13, and the onset temperature of the reaction was lower by approximately 100°C. It was found by X-ray photoelectron spectroscopy, temperature-programmed reduction, and UV spectroscopy that the high activity of 1–2% Ag/Al2O3 catalysts was due to the presence of small Agδ+n and Ag0m clusters on their surface. A decrease in the concentration of Ag below the optimum value resulted in the predominance of an inactive ionic form on the catalyst surfaces. As the concentration of Ag was increased (>2%), large particles of Ag2O and Ag0, which facilitate the oxidation of n-C6H14, were formed to lead to a decrease in selectivity and in the degree of reduction of nitrogen oxides.

Sadokhina N.A. , Prokhorova A.F. , Kvon R.I. , Mashkovskii I.S. , Bragina G.O. , Baeva G.N. , Bukhtiyarov V.I. , Stakheev A.Y.
Dependence of the catalytic activity of Ag/Al2O3 on the silver concentration in the selective reduction of NO x with n-hexane in the presence of H2
Kinetics and Catalysis. 2012. V.53. N1. P.107-116. DOI: 10.1134/s0023158412010090 WOS Scopus OpenAlex

Web of science:	WOS:000302314100013
Scopus:	2-s2.0-84861125140
OpenAlex:	W2094118905

DB	Citing
OpenAlex	20
Scopus	20
Web of science	15