# Kinetics and H2O Influence on NOx Trapping and Selective Catalytic Reduction over Ce/Pd Doping Catalyst

## TL;DR

This study compares how Ce and Pd doping affect the removal of pollutants and the impact of water on catalyst performance.

## Contribution

The paper introduces new insights into the effects of Ce and Pd doping on pollutant removal and water's role in catalytic processes.

## Key findings

- Pd doping improves CO and C3H6 removal at low temperatures compared to Ce doping.
- Ce doping shows better low-temperature NO conversion than Pd doping.
- H2O enhances NOx storage but reduces NO catalytic reduction in the LaKMnPdO3 catalyst.

## Abstract

In this paper, the removal effects and activation energy of Ce and Pd doping on pollutants (CO, C3H6, and NO) were comparatively analyzed by using characterization methods and constructed kinetic equations. Furthermore, the problems of the water influence mechanism on the NSR process were also discussed. The results show the following: (1) Pd doping effectively improves the removal of CO (80%) and C3H6 (71%) in the low-temperature section of the catalyst (150–250 °C) compared to Ce doping, while Ce doping exhibits excellent low-temperature conversion of NO. (2) The reaction activation energy of the LaKMnPdO3 catalyst was 9784 kJ/mol, which was significantly lower than that of the LaKMnCeO3 catalyst. (3) The presence of H2O has an important enhancement effect in the storage performance of the LaKMnPdO3 catalyst for NOx but decreases the catalytic reduction of NO. It provides a solution for the effective treatment of the increasing problems of particulate matter and ozone pollution.