Publication

Cooperative Redox Catalysis of N 2 O Decomposition by Short‐Range RhO x and CeO x Anchored to Co 3 O 4

2026

Abstract

Hybrid materials based upon mixed metal oxides provide an effective strategy to boost catalytic performance through redox‐induced interfacial engineering. Herein, we present an efficient catalyst toward N 2 O decomposition containing short‐range ordered RhO x and CeO x species anchored to the Co 3 O 4 spinel. The activity enhancement relative to Co 3 O 4 is non‐additive with respect to the RhO x /Co 3 O 4 and CeO x /Co 3 O 4 interfaces and is uniquely linked to the modulation of the Co and Rh oxidation states at a synergistic Rh–O–Co–O–Ce interface. This ensemble provides increased redox flexibility and facilitated lattice oxygen activation, resulting in markedly enhanced N 2 O decomposition. Kinetic analysis and operando modulated excitation x‐ray absorption spectroscopy (ME‐XAS) provide direct mechanistic evidence that N 2 O decomposition proceeds via a multi‐site, cooperative Mars‐van Krevelen pathway, in which Co 3 O 4 –CeO 2 acts as an oxygen reservoir enabling the redox cycling of RhO x species. This study highlights the ability of mixed metal oxide catalysts to exploit interfacial effects to achieve improved activity in redox‐mediated reactions and offers a rationale for the engineering of metal oxide–metal oxide catalysts guided by operando spectroscopy.

Official source

https://infoscience.epfl.ch/entities/publication/f3190d5e-a3dc-4e8f-b287-c05fc34f758e

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f3190d5e-a3dc-4e8f-b287-c05fc34f758e

About this result

Related concepts (32)

Catalysis

Catalysis (kəˈtæləsɪs) is the process of change in rate of a chemical reaction by adding a substance known as a catalyst (ˈkætəlɪst). Catalysts are not consumed by the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst.

Transition metal

In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. The lanthanide and actinide elements (the f-block) are called inner transition metals and are sometimes considered to be transition metals as well. Since they are metals, they are lustrous and have good electrical and thermal conductivity.

Cholesky decomposition

In linear algebra, the Cholesky decomposition or Cholesky factorization (pronounced ʃəˈlɛski ) is a decomposition of a Hermitian, positive-definite matrix into the product of a lower triangular matrix and its conjugate transpose, which is useful for efficient numerical solutions, e.g., Monte Carlo simulations. It was discovered by André-Louis Cholesky for real matrices, and posthumously published in 1924. When it is applicable, the Cholesky decomposition is roughly twice as efficient as the LU decomposition for solving systems of linear equations.

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Cooperative Redox Catalysis of N <sub>2</sub> O Decomposition by Short‐Range RhO <i> <sub>x</sub> </i> and CeO <i> <sub>x</sub> </i> Anchored to Co <sub>3</sub> O <sub>4</sub>

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