Topic
Mixed oxide
About: Mixed oxide is a research topic. Over the lifetime, 5224 publications have been published within this topic receiving 115567 citations.
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TL;DR: In this paper, a microemulsion mediated synthesis was developed to prepare fine powders of TiO2, ZrO2 and BaTiO3 in the size range between 10-40nm.
39 citations
TL;DR: In this paper, the SO2 poisoning on a Cu-supported Ti-Zr mixed oxide catalyst (Cu/Ti0.7Zr0.3O2−δ) in selective catalytic reduction of NOx with C3H6 was investigated, and the different effects of SO2 at varying reaction temperatures were clarified by in situ Fourier transform infrared (FTIR) spectroscopy combined with density functional theory (DFT) calculations.
Abstract: The SO2-poisoning on a Cu-supported Ti–Zr mixed oxide catalyst (Cu/Ti0.7Zr0.3O2−δ) in selective catalytic reduction (SCR) of NOx with C3H6 was investigated, and the different effects of SO2 at varying reaction temperatures were clarified by in situ Fourier transform infrared (FTIR) spectroscopy combined with density functional theory (DFT) calculations. In situ FTIR results of the catalyst at low temperatures (150–250 °C) implied that the formation of sulfates on the surface inhibited the activation of NO and C3H6 as well as the reactivity of nitrates and NO2. The weakened capacity of the catalyst toward acetate formation is an important reason for the decline of catalytic activity at low temperatures. At high temperatures (above 275 °C), the negative effect of SO2 on the C3H6 activation to acetate is quite weak. More importantly, the generation of −NCO species is enhanced significantly via the reaction −CN + SO2/SO42– → −NCO, which is confirmed by both in situ FTIR experimental observations and DFT calcu...
39 citations
TL;DR: In this article, two classes of MoNi catalysts, surface niobium-aluminum oxides and mixed Niobium aluminum oxide oxides, were examined for hydroprocessing of gas-oils.
39 citations
TL;DR: In this article, the authors characterized the catalytic properties of SnO2-MoO3 mixed oxide catalysts by X-ray photoelectron spectroscopy coupled with ESR, ir, Mossbauer, and Xray diffraction analysis.
39 citations
Patent•
22 Feb 2010
TL;DR: In this article, the authors presented a process for the preparation of an oxidative dehydrogenation catalyst of C 2-4 paraffins to olefins comprising comminuting: from 10 to 99 weight % of a mixed oxide catalyst of the formula V x Mo y Nb z Te m Me n O p, wherein Me is a metal selected from the group consisting of Ta, Ti, W, Hf, Zr, Sb and mixtures thereof.
Abstract: The present invention provides a process for the manufacture of an efficient and robust catalyst for the oxidative dehydrogenation of paraffins to olefins, preferably lower C 2-4 paraffins. The present invention provides a process for the preparation of an oxidative dehydrogenation catalyst of C 2-4 paraffins to olefins comprising comminuting: from 10 to 99 weight % of a mixed oxide catalyst of the formula V x Mo y Nb z Te m Me n O p , wherein Me is a metal selected from the group consisting of Ta, Ti, W, Hf, Zr, Sb and mixtures thereof; with from 90 to 1 weight % of an inert matrix selected from oxides of titanium, zirconia, aluminum, magnesium, yttria, lantana, silica and their mixed compositions or a carbon matrix to produce particles having a size from 1 to 100 microns and forming the resulting particles into pellets having a size from 0.1 to 2 mm.
39 citations