Investigating carbon monoxide and propene oxidation on a platinum diesel oxidation catalyst

Abstract

This paper presents a detailed analysis of global kinetic models for the oxidation of carbon monoxide and propene, in the presence of water, hydrogen, carbon dioxide, excess oxygen and nitrogen. The context is the automotive catalytic converter for a lean burn engine. Experimental results are presented for a commercial platinum diesel oxidation catalyst used in the form of a 400 CPSI washcoated monolith. Models are developed based on the classical LHHW format presented by Voltz et al., Ind. Eng. Chem. Prod. Res. Dev. 1973;12:294. The models are developed stepwise for experiments for each reactant alone and the predictive ability of the results is examined. It is found that it is necessary to use experiments with both reactants present to develop a reliable model.

Steady-state and dynamic hysteresis effects during lean co-oxidation of CO and C3H6 over Pt/Al2O3 monolithic catalyst

“…In a well-cited study, Voltz et al [7] reported that both CO and C 3 H 6 oxidation are self-inhibiting. Furthermore, in a CO + C 3 H 6 mixture, CO inhibits C 3 H 6 oxidation and vice versa due to competitive adsorption over active catalytic sites [7,8,19,20]. Complicating this nonlinear kinetic behavior is the potential occurrence of steady state multiplicity and sustained oscillations, particularly for CO oxidation.…”

Experimental and modeling study of CO and hydrocarbons light-off on various Pt-Pd/γ-Al 2 O 3 diesel oxidation catalysts

“…To compute the binary diffusion coefficients of each species in the mixture as a function of temperature, we used and fitted the empirical correlations based on Fuller et al [35]: (3)(4)(5)(6)(7)(8)(9) where ‫ܯ‬ is the molecular weight of the j-th species, and ‫ݒ‬ the diffusion volume of the j-th species. The binary diffusion coefficients are reported in Table 3.…”

“…The above 1D model consists of two species balance equations, (3-1) and (3-2) for each gaseous species, and two energy balances (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) were obtained from a multi-channel monolith placed in a quartz tube located inside a furnace, whose temperature is regulated by ramp-up rate of 8 o C/min. As discussed in the literature [11], the error due to this approximation may be small provided the concentrations used are sufficiently low (or low adiabatic temperature rise).…”

“…Garetto et al [5] compared Pt-supported catalysts performances during oxidation of ethane, propane, and butane [2]. CO inhibits HC oxidation in CO and HC mixtures, and HCs inhibit CO oxidation due to competitive adsorption on active catalytic sites [6][7][8][9]. Carlsson et al [10] studied CO oxidation on Pt/γ-Al 2 O 3 using TPO experiments.…”

The Development and Application of an Evolutionary Algorithm for the Determination of Kinetic Parameters in Automotive Aftertreatment Models

“…Sola et al [11] used a GPS algorithm within the MATLAB optimisation toolbox to optimise kinetic parameters of CO and C 3 H 6 oxidation on a platinum DOC model. Pontikakis and Stamelos [12] programmed a genetic algorithm approach to optimise a set of ten reactions in a three-way catalyst model, showing a high level of accuracy when applied to the new European drive cycle (NEDC).…”