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Metal–organic framework templated Pd/CeO2@N-doped carbon for low-temperature CO oxidation

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Abstract

A new Pd/Ce based metal–organic framework is designed and synthesized as a self-sacrificial template for fabrication of an efficient catalyst for CO oxidation. The catalyst obtained by thermal annealing at 700 °C (Pd/CeO2@NC-700) is composed of N-doped carbon with embedded Pd and CeO2 nanoparticles, which are highly dispersed and closely connected in the N-doped carbon; the high Pd loading (33.7 wt%) and the coupling between Pd and the CeO2 phase synergistically boost the CO oxidation performance. The Pd/CeO2@NC-700 catalyst exhibits a 100% conversion temperature of 89 °C and excellent long-term stability. By combining structural characterization with density functional theory calculations, two possible CO oxidation pathways of TPB and TOP are revealed, in which the adsorbed O2 directly dissociates to O* atoms and activates CO* molecules. The transfer of O* between Pd and Ce (TPB) or Pd and Pd (TOP) facilitates the formation of Image ID:c9na00744j-t1.gif intermediates and finally results in the production of CO2. This work provides a new insight into the development of novel efficient catalysts for CO oxidation based on metal–organic frameworks.

Graphical abstract: Metal–organic framework templated Pd/CeO2@N-doped carbon for low-temperature CO oxidation

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Article information


Submitted
25 Nov 2019
Accepted
30 Dec 2019
First published
31 Dec 2019

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

Metal–organic framework templated Pd/CeO2@N-doped carbon for low-temperature CO oxidation

W. Fan, D. Liu, X. Wang, X. Liu, D. Cao, L. Fan, Z. Huang, W. Guo and D. Sun, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/C9NA00744J

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