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Fine-tuned local coordination environment of Pt single atoms on ceria controls catalytic reactivity
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Fine-tuned local coordination environment of Pt single atoms on ceria controls catalytic reactivity
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Journal Article
Fine-tuned local coordination environment of Pt single atoms on ceria controls catalytic reactivity
2022
Overview
Constructing single atom catalysts with fine-tuned coordination environments can be a promising strategy to achieve satisfactory catalytic performance. Herein, via a simple calcination temperature-control strategy, CeO
2
supported Pt single atom catalysts with precisely controlled coordination environments are successfully fabricated. The joint experimental and theoretical analysis reveals that the Pt single atoms on Pt
1
/CeO
2
prepared at 550 °C (Pt/CeO
2
-550) are mainly located at the edge sites of CeO
2
with a Pt–O coordination number of
ca
. 5, while those prepared at 800 °C (Pt/CeO
2
-800) are predominantly located at distorted Ce substitution sites on CeO
2
terrace with a Pt–O coordination number of
ca
. 4. Pt/CeO
2
-550 and Pt/CeO
2
-800 with different Pt
1
-CeO
2
coordination environments exhibit a reversal of activity trend in CO oxidation and NH
3
oxidation due to their different privileges in reactants activation and H
2
O desorption, suggesting that the catalytic performance of Pt single atom catalysts in different target reactions can be maximized by optimizing their local coordination structures.
CeO
2
-supported Pt single atoms with different coordination environments exhibit distinct behaviors in reactant adsorption/activation and product desorption, thus showing different catalytic performance for various catalytic oxidation reactions.
