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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.
This article was published in the following journal.
Name: Environmental science & technology
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A tripartite motif protein consisting of an N-terminal RING finger, two B-box type ZINC FINGERS, and C-terminal PHD domain. It functions as a transcriptional repressor by associating with Kruppel-association box domain (KRAB domain) transcription factors and has E3-SUMO-ligase activity towards itself and also sumoylates INTERFERON REGULATORY FACTOR-7 to reduce its activity as a transcriptional activator. It can also function as a ubiquitin protein ligase towards TUMOR SUPPRESSOR PROTEIN P53.
Stable nitrogen atoms that have the same atomic number as the element nitrogen, but differ in atomic weight. N-15 is a stable nitrogen isotope.
The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.
Unstable isotopes of nitrogen that decay or disintegrate emitting radiation. N atoms with atomic weights 12, 13, 16, 17, and 18 are radioactive nitrogen isotopes.
P-type ATPases which transport copper ions across membranes in prokaryotic and eukaryotic cells. They possess a conserved CYSTEINE-HISTIDINE-SERINE (CPx) amino acid motif within their transmembrane helices that functions in cation translocation and catalytic activation, and an N-terminal copper-binding CxxC motif that regulates enzyme activity. They play essential roles in intracellular copper homeostasis through regulating the uptake, efflux and storage of copper ions, and in cuproprotein biosynthesis.