Predicción del factor de efectividad en monolitos de matriz metálica con recubrimiento catalítico no uniforme

MARÍA JOSÉ TAULAMET; NÉSTOR JAVIER MARIANI; OSVALDO MIGUEL MARTÍNEZ; GUILLERMO FERNANDO BARRETO

La Plata

Jornada; Sextas Jornadas de Investigación, Transferencia, Extensión y Enseñanza de la Facultad de Ingenería; 2021

The one dimensional two-zone model (1D-2Z) to estimate effectiveness factor in non-uniform coatings of metallic monolith channels with sinusoidal cross-section is thoroughly tested in this contribution. The model relies on the idea of splitting the cross section of the coating in two zones that can be modelled independently taking into account the diffusion and simultaneous reaction in a single direction (1D). One of the zones is considered as a slab, while the previously developed variable diffusivity model (1D-VD) is applied to the other. The predictive capabilities of the 1D-2Z model is assessed for three kinetic expressions: a first order reaction and two more challenging cases defined by Langmuir-Hinshelwood-Hougen-Watson expressions: one of them with a moderate self-inhibition effect and the other with a strong self-inhibition effect, close to the onset of the multiple steady states behaviour. Simultaneously, different degrees of non-uniform coatings are considered. The 1D-2Z model allows obtaining a remarkable precision in the estimation of the effectiveness factors for the complete range of Thiele modulus with maximum errors below 5.6%.