Unknown

Dataset Information

0

Improved Pd/CeO2 Catalysts for Low-Temperature NO Reduction: Activation of CeO2 Lattice Oxygen by Fe Doping.

ABSTRACT: Developing better three-way catalysts with improved low-temperature performance is essential for cold start emission control. Density functional theory in combination with microkinetics simulations is used to predict reactivity of CO/NO/H2 mixtures on a small Pd cluster on CeO2(111). At low temperatures, N2O formation occurs via a N2O2 dimer over metallic Pd3. Part of the N2O intermediate product re-oxidizes Pd, limiting NO conversion and requiring rich conditions to obtain high N2 selectivity. High N2 selectivity at elevated temperatures is due to N2O decomposition on oxygen vacancies. Doping CeO2 by Fe is predicted to lead to more oxygen vacancies and a higher N2 selectivity, which is validated by the lower onset of N2 formation for a Pd catalyst supported on Fe-doped CeO2 prepared by flame spray pyrolysis. Activating ceria surface oxygen by transition metal doping is a promising strategy to improve the performance of three-way catalysts.

SUBMITTER: Zhang L 

PROVIDER: S-EPMC8154324 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature

Json Xml
altmetric image

Publications

Improved Pd/CeO<sub>2</sub> Catalysts for Low-Temperature NO Reduction: Activation of CeO<sub>2</sub> Lattice Oxygen by Fe Doping.

Zhang Long L   Spezzati Giulia G   Muravev Valery V   Verheijen Marcel A MA   Zijlstra Bart B   Filot Ivo A W IAW   Su Ya-Qiong YQ   Chang Ming-Wen MW   Hensen Emiel J M EJM  

ACS catalysis 20210422 9

Developing better three-way catalysts with improved low-temperature performance is essential for cold start emission control. Density functional theory in combination with microkinetics simulations is used to predict reactivity of CO/NO/H<sub>2</sub> mixtures on a small Pd cluster on CeO<sub>2</sub>(111). At low temperatures, N<sub>2</sub>O formation occurs via a N<sub>2</sub>O<sub>2</sub> dimer over metallic Pd<sub>3</sub>. Part of the N<sub>2</sub>O intermediate product re-oxidizes Pd, limitin  ...[more]

Similar Datasets

Unknown Secondary-Atom-Doping Enables Robust Fe-N-C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction.
| S-EPMC7770947 | biostudies-literature
Unknown Tuning Pt-CeO<sub>2</sub> interactions by high-temperature vapor-phase synthesis for improved reducibility of lattice oxygen.
| S-EPMC6433950 | biostudies-literature
Unknown Nanochannel-Controlled Synthesis of Ultrahigh Nitrogen-Doping Efficiency on Mesoporous Fe/N/C Catalysts for Oxygen Reduction Reaction.
| S-EPMC6987278 | biostudies-literature
Unknown Improved H<sub>2</sub> utilization by Pd doping in cobalt catalysts for reductive amination of polypropylene glycol.
| S-EPMC9058643 | biostudies-literature
Unknown Hydrogen Production from Methanol Steam Reforming over Fe-Modified Cu/CeO<sub>2</sub> Catalysts.
| S-EPMC11357062 | biostudies-literature
Unknown The effects of Fe, Mg, and Pt-doping on the improvement of Ni stabilized on Al<sub>2</sub>O<sub>3</sub>-CeO<sub>3</sub> catalysts for methane dry reforming.
| S-EPMC10634349 | biostudies-literature
Unknown Pd-incorporated polyoxometalate catalysts for electrochemical CO<sub>2</sub> reduction.
| S-EPMC11342151 | biostudies-literature
Unknown Morphology effects on surface chemical properties and lattice defects of Cu/CeO<sub>2</sub> catalysts applied for low-temperature CO oxidation.
| S-EPMC6700188 | biostudies-literature
Unknown Electronic and lattice strain dual tailoring for boosting Pd electrocatalysis in oxygen reduction reaction.
| S-EPMC8586809 | biostudies-literature
Unknown High-ammonia selective metal-organic framework-derived Co-doped Fe/Fe<sub>2</sub>O<sub>3</sub> catalysts for electrochemical nitrate reduction.
| S-EPMC8833204 | biostudies-literature