Modelling of local aging effects of commercial three‐way catalysts: Spatial temperature and CO conversion profiles

Abstract

The correlation between thermal aging effects of three‐way catalysts (TWC) and their spatial temperature profiles and CO conversion was studied. The study is based on temperature profiles within fresh and aged catalysts, as well as CO concentrations at the outlet of the samples. The highest deactivation was always observed at the catalyst inlet area. The modelling approach with separated reaction mechanisms for palladium and rhodium used here assumes a direct correlation between the temperature profiles resulting from the exothermal chemical reactions and the catalytically active surface area. The noble metal dispersion is determined by low temperature CO chemisorption measurements. It is used in simulation as the relevant parameter for quantitative prediction of the catalyst performance.

CFD Evaluation of In Situ Probe Techniques for Catalytic Honeycomb Monoliths

“…A multi-step surface reaction mechanism was used, which includes 3 gas phase species, 5 surface species, and 10 reactions [23]. For the palladium catalyst, the measured dispersion resulted in F cat/geo = 33.…”

How do you write and present research well? 2 –Replace 007 with an explicit agent

“…Several pre-treated and aged Pd/Rh-based commercial threeway catalysts were investigated for their ability to oxidize CO. [14] [p. 1595]…”

Optimally designed synthesis of advanced Pd‐Rh bimetallic three‐way catalyst

“…In general, TWCs usually contain platinum group metals (PGMs) such as Pt, Pd, and Rh as active components . Since Pd has been demonstrated as an applicable substitution for Pt, the Pd‐Rh bimetallic catalyst is currently the most common of the modern commercial TWC instead of Pt‐Rh system, in which the joint utilization of Pd and Rh provides an efficient activity performance …”

“…[2][3][4] Since Pd has been demonstrated as an applicable substitution for Pt, the Pd-Rh bimetallic catalyst is currently the most common of the modern commercial TWC instead of Pt-Rh system, in which the joint utilization of Pd and Rh provides an efficient activity performance. [2,3,[5][6][7] Alumina (Al 2 O 3 ) is one of the most common catalytic materials in the TWC owing to its comparatively high surface area and excellent thermal resistance, and it is the reason for a reduction in cost. [2,[8][9][10] Other auxiliaries including ceria and zirconia are also indispensable because they play critical roles as catalytic promoters to improve the catalytic performance and durability.…”