Measurements of diesel soot oxidation kinetics in an isothermal flow reactor–catalytic effects using Pt based coatings

Abstract

Despite the significant progress in soot oxidation studies, there is still high uncertainty regarding the rate expressions to model the reactions in diesel particulate filters (DPF). This uncertainty arises from inherent difficulties in sampling and measuring the reaction rate in a realistic way, as well as different properties of the examined soot. In this context, the scope of this study is the development of a novel experimental set-up capable of overcoming existing experimental difficulties. The developed set-up allows for real diesel soot oxidation studies in an isothermal flow reactor. The reaction of soot with oxygen and NO 2 is studied with synthetic gas and with real diesel exhaust and the reaction kinetics are derived for both bare and Pt-based catalyzed substrates by combining experimental and model results.

Nitrate storage behavior of Ba/MnOx–CeO2 catalyst and its activity for soot oxidation with heat transfer limitations

“…To develop suitable catalysts capable of promoting soot oxidation by NO x is an efficient way for removal of soot at relative low temperatures. Among the catalysts investigated, novel metals such as platinum are one of the most active kinds as they can effectively catalyze oxidation of NO to NO 2 [2,3].…”

NOx-Assisted Soot Oxidation on Pt–Mg/Al2O3 Catalysts: Magnesium Precursor, Pt Particle Size, and Pt–Mg Interaction

“…4 Among the catalysts investigated, noble metals such as platinum are one of the most commonly applied kinds, as they can effectively catalyze oxidation of NO to NO 2 . 5,6 Nevertheless, the soot oxidation rate would be limited by the reduced NO x concentration in exhaust gas from modern engines. The NO x storage feature of alkali and alkaline earth metals can provide additional desorbed NO 2 at moderate temperatures and thus make them a promising component in soot oxidation catalysts.…”

Effects of tungsten oxide on soot oxidation activity and sulfur poisoning resistance of Pt/Al2O3 catalyst

“…Among the catalysts investigated, Pt exhibits a high level of catalytic activity by oxidizing NO in the exhaust gas to NO 2 , which has a remarkable effect on the oxidation of soot to CO 2 . [5][6][7][8] However, Pt based catalysts will be deactivated a lot during exposure in O 2 and NO + O 2 . This deactivation in catalytic combustion is attributed to the oxidation of Pt to PtO or PtO 2 , which are less active than metallic platinum.…”