Kinetic Study of NO Oxidation over Pt/γ-Al2O3 and La0.8 Sr 0.2MnO3

Ying Xian Zhao; Lin Xiao

doi:10.4028/www.scientific.net/AMR.347-353.862

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 347-353Kinetic Study of NO Oxidation over Pt/γ-Al2O3 and...

Kinetic Study of NO Oxidation over Pt/γ-Al₂O₃ and La_0.8 Sr _0.2MnO₃

Abstract:

Catalytic oxidation of NO with O2 over Pt/-Al2O3 and La0.8Sr0.2MnO3 was conducted with a tubular reactor in range of space time 0.090-0.720 second, inlet NO concentration 0.03-0.2 vol%, O2 concentration 2-10 vol% and at 473 K. Under the conditions of 0.720 s space time, 0.05 vol% NO and 5 vol% O2 concentrations, the steady-state conversion of NO oxidation over Pt/-Al2O3 and La0.8Sr0.2MnO3 reached 22.4 and 90.5 %, respectively. A kinetic model consisting of 12 elementary reactions fits the experimental data adequately, indicated that the rate-limiting step of NO oxidation over Pt/-Al2O3 was the reaction between gaseous NO with dissociately adsorbed O, and over La0.8Sr0.2MnO3 was the desorption of product NO2.