Dependence of the Catalytic Activity of Ag/Al2O3 on the Silver Concentration in the Selective Reduction of NOx with n-Hexane in the Presence of H-2 Full article
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Output data | Year: 2012, Volume: 53, Number: 1, Pages: 107-116 Pages count : 10 DOI: 10.1134/S0023158412010090 | ||||||
| Tags | Selective Catalytic Reduction; Nitrogen Oxide; Silver Catalyst; Automotive Catalytic Converter; Nonselective Oxidation | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 10-03-01138 |
| 2 | Haldor Topsoe A/S |
Abstract:
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 Ag n δ+ and Ag m 0 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.
Cite:
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 NOx with n-Hexane in the Presence of H-2
Kinetics and Catalysis. 2012. V.53. N1. P.107-116. DOI: 10.1134/S0023158412010090 WOS Scopus РИНЦ ANCAN OpenAlex
Dependence of the Catalytic Activity of Ag/Al2O3 on the Silver Concentration in the Selective Reduction of NOx with n-Hexane in the Presence of H-2
Kinetics and Catalysis. 2012. V.53. N1. P.107-116. DOI: 10.1134/S0023158412010090 WOS Scopus РИНЦ ANCAN OpenAlex
Original:
Садохина Н.А.
, Прохорова А.Ф.
, Квон Р.И.
, Машковский И.С.
, Брагина Г.О.
, Баева Г.Н.
, Бухтияров В.И.
, Стахеев А.Ю.
Зависимость каталитической активности AG/AL2O3 от концентрации AG в условиях селективного восстановления NOX Н-гексаном в присутствии Н2
Кинетика и катализ. 2012. Т.53. №1. С.110-119. РИНЦ
Зависимость каталитической активности AG/AL2O3 от концентрации AG в условиях селективного восстановления NOX Н-гексаном в присутствии Н2
Кинетика и катализ. 2012. Т.53. №1. С.110-119. РИНЦ
Dates:
| Submitted: | May 11, 2011 |
| Published print: | Feb 1, 2012 |
| Published online: | Feb 14, 2012 |
Identifiers:
| Web of science: | WOS:000302314100013 |
| Scopus: | 2-s2.0-84861125140 |
| Elibrary: | 17985417 |
| Chemical Abstracts: | 2012:214991 |
| Chemical Abstracts (print): | 157:335676 |
| OpenAlex: | W2094118905 |