Co 3 O 4 −CeO 2 Nanocomposites for Low‐Temperature CO Oxidation
نویسندگان
چکیده
منابع مشابه
CO oxidation mechanism on CeO(2)-supported Au nanoparticles.
Density functional theory was used to study the CO oxidation catalytic activity of CeO(2)-supported Au nanoparticles (NPs). Experimental observations on CeO(2) show that the surface of CeO(2) is enriched with oxygen vacancies. We compare CO oxidation by a Au(13) NP supported on stoichiometric CeO(2) (Au(13)@CeO(2)-STO) and partially reduced CeO(2) with three vacancies (Au(13)@CeO(2)-3VAC). The ...
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Low-temperature oxidation of CO, perhaps the most extensively studied reaction in the history of heterogeneous catalysis, is becoming increasingly important in the context of cleaning air and lowering automotive emissions. Hopcalite catalysts (mixtures of manganese and copper oxides) were originally developed for purifying air in submarines, but they are not especially active at ambient tempera...
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Oxygen vacancy levels are monitored during the oxidation of CO by CeO(2-δ) nanorods and Au-CeO(2-δ) nanorods, nanocubes, and nanopolyhedra by using Raman scattering. The first-order CeO(2) F(2g) peak near 460 cm(-1) decreases when this reaction is fast (fast reduction and relatively slow reoxidation of the surface), because of the lattice expansion that occurs when Ce(3+) replaces Ce(4+) during...
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— The structure of [Co(NH3)5CO3]NO3•H2O is determined ab initio from conventional X-ray powder diffractometry by the direct methods. The cell is monoclinic, space group P21, Z = 2, a = 7.6733(4) Å, b = 9.6398(5) Å, c = 7.0852(3) Å and β = 106.195(3)°. Refinements by the Rietveld method, lead to RB = 0.053, RP = 0.100, and RWP = 0.119. Hydrogen atoms could not be located. Nevertheless a bonding ...
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A copper-ceria bulk catalyst has been compared to a series of catalysts designed according to the as called “supported approach”, corresponding to the dispersion of low content mixed copper-ceria oxide on alumina matrix. The principal characteristics of both types of catalysts are contemplated and the differences in their electronic and redox properties discussed in details. As a plus, the gold...
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ژورنال
عنوان ژورنال: Chemistry – A European Journal
سال: 2021
ISSN: 0947-6539,1521-3765
DOI: 10.1002/chem.202100927