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Exceptional activity over sub-monolayer MoO3 motif on TiO2 for nitrogen oxides emission abatement.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Exceptional activity over sub-monolayer MoO3 motif on TiO2 for nitrogen oxides emission abatement."

Surface restructuring is s useful approach to modulate nanoparticle property. Low-dimensional atomic-thick active species may exhibit remarkably enhanced activity, in contrast to the inert nature of its bulk counterparts. Here, we report a procedure to in situ grow low-dimensional monolayer-thick MoO3 entity from its bulk precursor. Traditional analysis of NO abatement catalyzed by vanadium-based materials implicates vanadium as the active site enhanced by the promoter element W or Mo. However, we report here that the atomic-thin MoO3 film can function alone as an efficient NO abatement catalyst by itself; to achieve comparable performance with the industrial catalysts, it is not necessary to add vanadium oxide, which often has serious toxicity issues associated with it. We find that submonolayer MoO3 is responsible for the high activity observed. Electron microscopy and Raman spectroscopy reveal that the monolayer-thick MoO3 surface phase is directly attached to the anatase TiO2 support. The ab initio quantum calculations predict that the bidimensional MoO3 surface phase would provide more electron back-donation to the antibonding orbital of reactants and thus more efficient reactant activation. The spectra evolution of in situ DRIFTS indicates that the redox mechanism over the low-dimensional MoO3/TiO2 involves both Brønsted and Lewis acid sites during the reaction cycle.

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Name: Environmental science & technology
ISSN: 1520-5851
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