Surface oxygenation of multicomponent nanoparticles toward active and stable oxidation catalysts.

Abstract:

:The need for active and stable oxidation catalysts is driven by the demands in production of valuable chemicals, remediation of hydrocarbon pollutants and energy sustainability. Traditional approaches focus on oxygen-activating oxides as support which provides the oxygen activation at the catalyst-support peripheral interface. Here we report a new approach to oxidation catalysts for total oxidation of hydrocarbons (e.g., propane) by surface oxygenation of platinum (Pt)-alloyed multicomponent nanoparticles (e.g., platinum-nickel cobalt (Pt-NiCo)). The in-situ/operando time-resolved studies, including high-energy synchrotron X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy, demonstrate the formation of oxygenated Pt-NiOCoO surface layer and disordered ternary alloy core. The results reveal largely-irregular oscillatory kinetics associated with the dynamic lattice expansion/shrinking, ordering/disordering, and formation of surface-oxygenated sites and intermediates. The catalytic synergy is responsible for reduction of the oxidation temperature by ~100 °C and the high stability under 800 °C hydrothermal aging in comparison with Pt, and may represent a paradigm shift in the design of self-supported catalysts.

journal_name

Nat Commun

journal_title

Nature communications

authors

Shan S,Li J,Maswadeh Y,O'Brien C,Kareem H,Tran DT,Lee IC,Wu ZP,Wang S,Yan S,Cronk H,Mott D,Yang L,Luo J,Petkov V,Zhong CJ

doi

10.1038/s41467-020-18017-3

subject

Has Abstract

pub_date

2020-08-21 00:00:00

pages

4201

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18017-3

journal_volume

11

pub_type

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