Size-Controlled Synthesis of Pd Nanocatalysts on Defect-Engineered CeO for CO Hydrogenation.

ACS Appl Mater Interfaces

Center for Applied Chemical Research, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.

Published: June 2021

The size effects of metal catalysts have been widely investigated to optimize their catalytic activity and selectivity. However, the size-controllable synthesis of uniform supported metal nanoparticles without surfactants and/or additives remains a great challenge. Herein, we developed a green, surfactant-free, and universal strategy to tailor the sizes of uniform Pd nanoparticles on metal oxides by an electroless chemical deposition method defect engineering of supports. The nucleation and growth mechanism suggest a strong electrostatic interaction between the Pd precursor and low-defective CeO and a weak reducing capacity for low-defective CeO, resulting in small Pd nanoparticles. Conversely, large Pd nanoparticles were formed on a highly defective CeO surface. Combined with various and characterizations, a higher intrinsic activity of Pd for the CO-to-CO hydrogenation was found on large Pd nanoparticles with higher electron density owing to their stronger H dissociation ability and H-spillover effects, as well as the larger number of oxygen vacancies generated for CO activation under hydrogenation conditions.

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Source
http://dx.doi.org/10.1021/acsami.1c05722DOI Listing

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