Oxidation of carbon by NOx, with particular reference to NO2 and N2O

Stanmore, B. R.; Tschamber, Valérie; Brilhac, Jean-François

doi:10.1016/j.fuel.2007.04.012

Cited by 146 publications

(70 citation statements)

References 94 publications

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“…Figure 6b shows the results of a similar soot combustion run, wherein 500 ppm of NO were added to the feed gas stream. Clearly, the addition of NO did not affect the soot reactivity [14]: in the whole temperature range, in fact, the CO x formation was definitely comparable with the one seen in the absence of NO (Fig. 6a).…”

Section: Effect Of No X On Soot Combustionsupporting

confidence: 51%

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Interaction of NO x Reduction and Soot Oxidation in a DPF with Cu-Zeolite SCR Coating

Tronconi

Nova

Marchitti

et al. 2015

Emiss. Control Sci. Technol.

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The combination of selective catalytic reduction (SCR) and diesel particulate filter (DPF) in one system (so called SDPF) enables a very compact design and has already found its way into commercial application for passenger cars. In the case of heavy-duty and non-road applications, the design and control of the SDPF heavily depends on the interaction between NO x reduction and soot oxidation reactions taking place in close vicinity. The governing phenomena are described and studied in the present work by means of multi-scale experimental testing and mathematical modeling. Detailed kinetic studies at a micro-scale laboratory test rig are used to acquire the intrinsic reaction rates of the NH 3 -SCR reactions over a Cu-based catalyst, as well as to obtain qualitative trends of the role of soot presence. The above reaction kinetics are then directly implemented in a physicochemical model of the transport and reaction processes in a wall-flowcatalyzed filter. This model is validated against medium-scale engine tests revealing the competitive effects of SCR and passive soot oxidation, by a simple superposition of SCR chemistry and soot oxidation chemistry. This indicates that proper modeling of the species diffusion processes in the channels, the soot layer, and the wall is sufficient to describe the inhibiting effect of NH 3 -SCR on soot oxidation. This allows for a straightforward decoupled model calibration process which can be used to develop efficient system design and dosing control methodologies. Finally, the model is applied to a much different SDPF scale relevant for large non-road engines. The necessary adaptations to the model parameters are discussed as well as a methodology to apply predictive simulation tools when the boundary conditions are changed.

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Section: Effect Of No X On Soot Combustionsupporting

confidence: 51%

“…In view of the higher concentrations of CO x detected below 400°C (Fig. 6c), we can conclude that the presence of 250 ppm of NO 2 enhanced the lowtemperature soot combustion due to the occurrence of [7,14]:…”

Section: Effect Of No X On Soot Combustionmentioning

confidence: 74%

Interaction of NO x Reduction and Soot Oxidation in a DPF with Cu-Zeolite SCR Coating

Tronconi

Nova

Marchitti

et al. 2015

Emiss. Control Sci. Technol.

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“…The process was performed in a quartz glass tubular reactor consisting of two chambers, one of which was of the vaporizing type (6) for the oxidizing reagent, and the other was for introducing the CNTs (7). The reactor was placed in a tubular resistive electric furnace (8). To control the temperature, a chromel-alumel thermocouple (9) was used, whereas a microprocessor PID controller (10) was employed to fix the reagent supply.…”

Section: Methodsmentioning

confidence: 99%

Modelling of carbon nanotube functionalization processes

2017

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Abstract. In the present paper, kinetic regularities of oxidative functionalization of carbon nanotubes in nitric acid vapors are studied. The catalytic effect of transition metal oxide particles on the formation of carboxyl groups is shown. Based on the information about changes in the degree of functionalization and composition of gaseous reaction products, the effective values of the thermal effect of the implemented process are determined. A model of the temperature field of the reaction zone of the gas-phase oxidative functionalization of carbon nanotubes process is proposed, thereby making it possible to determine the structural and mode parameters of the equipment.

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“…In the second chamber, exhaust flows through a wall-flow filter, where gaseous components pass through, but the soot is trapped on the walls of the filter. The trapped soot is then removed by the NO2 produced by the catalyst in the first chamber [11].…”

Section: Emission Controlmentioning

confidence: 99%