# Cerium-doped UiO-66-supported Pd catalysts: activity enhancement and deactivation pathways in the carbonylation of methyl nitrite to DMC

## TL;DR

This paper studies how adding cerium to a metal-organic framework improves the performance and stability of a catalyst used to make dimethyl carbonate from methyl nitrite.

## Contribution

The study reveals how cerium doping enhances catalytic activity and identifies deactivation pathways in DMC synthesis.

## Key findings

- Cerium doping improves surface area, acidity, and CO adsorption, enhancing catalytic activity.
- Ce(0.1)-UiO-66 shows the highest thermal stability and catalytic stability at 547.26°C.
- Catalyst deactivation is caused by ligand replacement and Pd atom migration.

## Abstract

For the carbonylation of methyl nitrite (MN) to dimethyl carbonate (DMC), a series of Ce(x)-UiO-66 were synthesized and utilized as supports for Pd/Ce(x)-UiO-66 catalysts. The characteristics of the carriers were investigated using XRD, SEM, TG, NH3-TPD and BET analyses. The results showed that doping cerium in the UiO-66 significantly enhanced the catalytic activity by improving the surface area, acidity and CO adsorption of the catalysts. Ce(0.1)-UiO-66, with the highest thermal stability (547.26 °C), presented the highest catalytic stability in DMC synthesis. It was proven that the damage of C

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O and the migration of Pd atoms occurred due to the replacement of ligands and metal clusters, which led to catalytic deactivation.

Simultaneously enhancing catalytic performance and investigating the deactivation pathways in DMC synthesis.