Overview
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Key numbers
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- dispersive X-ray spectroscopy (EDXS, Figure 1b). In CrSA/ of Cr2O3/CeO2, it corresponds to only 0.2% of the total EPR
- To gain a deeper understanding of the underlying reasons measurements (Table S1).
- flowing 8 vol % NH3 or 20 vol % O2 at the typical reaction latter via oxidative treatment presents a potential catalyst
- standard NH3 oxidation feed (i.e., 8 vol % NH3 + 8 vol % O2) conducted, in which CrSA/CeO2 was exposed to 16 h on
- 16 h on stream but were no longer detectable immediately concentrated Cr signal, typically associated with aggregates or
- of any clearly detectable aggregates after 24 h. However, it is oxidative treatment was performed in static air (Figure 5a).
- state of Cr2O3/CeO2 (inset) during a 12 h oxidative treatment in 20 vol % O2 in N2 at 673 K. Conditions: Tbed = 673 K; mcat = 0.2 g; Ftot = 50 cm3
- similarities in the 200−400 nm range, which can be primarily limited signal-to-noise ratio, the data could not be mean-
- crystalline Cr2O3, respectively.40 In addition, a shoulder of a oxidation experiment of Cr2O3/CeO2 conducted in 20 vol %
- in this range.18 Literature reports have linked bands in the stabilized as isolated sites on the surface of CeO2 (Figure S13).
- range of ∼800−1300 nm to d−d transitions in Cr2+ species in
- cies.24,42,43 However, as Raman data (Figure 5a) do not notable, suggesting that Cr6+ species are forming. Still, while
- disappearance of the broad signal, unlike in Cr2O3/ZrO2. by means of an oxidizing treatment, enabling catalyst
- oxide supports (Figure S22). Both TiO2 and ZrO2, while less tunable catalysts with regeneration potential for a wide range
Methods (brief)
- of different chromium species in the two samples was verified detectable feature for this sample, further evidencing the
- chromium in the sample,30 we can still expect single-atom Cr2O3/CeO2 did not change following the treatment in NH3
- chromium sites to be the dominant speciation in the sample. flow (Figure 2b), reflected in virtually constant NH 3
- influence the structure of each catalyst, their performance in and with the sample consisting primarily of large Cr2O3
- normalized per number of moles of chromium in the sample, progressed, until a stable level was achieved. Accordingly,
- of experiments, the sample was subjected to treatment in chromium sites into Cr2O3 nanoparticles, redispersion of the
- confirmed to be crystalline. Therefore, it should be verified the contacting pattern of O2 with the sample was found to
- vacancies are concurrently formed. This suggests that the time during oxidative treatment. The sample was placed in a
- UV−visible diffuse reflectance spectroscopy (UV−vis DRS), permit heating the sample in an inert atmosphere, the sample
- structural evolution of the catalyst. Ex-situ spectra of Cr2O3/ collected approximately every 90 s throughout the treatment.
- Cr2O3/CeO2 but completely absent in other samples. 600 K. The latter also suggests that dehydroxylation of CeO2 is
- species. However, even after 12 h of treatment, a band near the sample exists as Cr2O3 nanoparticles. As the oxidative
- constant J is large enough, leads to line narrowing and Additionally, the ex-situ XANES spectra of the two samples are
- clusters, Cr3+−Cr3+ exchange is typically strong, therefore state of chromium is similar in the two samples (Figure S17).
- effect is also observable at our reaction temperature (673 K), oxidative treatment of ZrO2- and TiO2-based samples has
- we measured three model samples of Cr2O3 particles calcined shifted their performance toward that of Cr/ZrO2 and Cr/
- clear signal narrowing (from 850 to 450 G) and with for CeO2-supported samples and suggests that redispersion is
- narrowing due to an increase of exchange coupled spins. ance of Al2O3- and Nb2O5-supported samples was observed,
Implications
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Wiki pages this source may touch
- Fish — marine, predatory (tuna, swordfish, shark, king mackerel)
- Baby Sunscreen, Mineral (ZnO + TiO2)
- Chromium
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Update history
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