Journal ArticleDOI
FT-IR study of the adsorption and transformation of formaldehyde on oxide surfaces
TLDR
The adsorption of formaldehyde on different oxides (silica, pure and fluorided alumina, magnesia, titania, thoria, zirconia, and iron oxide) has been studied by FT-IR spectroscopy in the temperature range 170-570 K as mentioned in this paper.Abstract:
The adsorption of formaldehyde on different oxides (silica, pure and fluorided alumina, magnesia, titania, thoria, zirconia, and iron oxide) has been studied by FT-IR spectroscopy in the temperature range 170-570 K. The following adsorbed species have been identified and characterized spectroscopically: (i) physisorbed HCHO, (ii) coordinated HCHO, (iii) dioxymethylene, (iv) polyoxymethylene, (v) formate ions, and (vi) methoxy groups. On silica at 170 K formaldehyde physisorbs on surface OH groups and, by warming, polymerizes producing linear polyoxymethylene. On ionic oxides at about 250 K dioxymethylene is always observed, generally together with variable amounts of the linear polymer that has been isolated on magnesia at 170 K. Heating up to or above room temperature results in the disproportionation of dioxymethylene into formate and methoxide groups, probably via a Cannizzaro-type mechanism. Such a route probably parallels an oxidative route, involving direct oxidation of dioxymethylene into formates, as observed on iron oxide.read more
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High catalytic activity for formaldehyde oxidation of AgCo/APTES@MCM-41 prepared by two steps method
TL;DR: In this article, a novel synthesis procedure to prepare a highly active bimetallic AgCo/APTES@MCM-41 catalyst was reported, and the complete oxidation of formaldehyde was achieved at temperature as low as 90°C over the Bimetallic catalysts with Ag/Co = 3/1 (mass ratio).
Journal ArticleDOI
Adsorption and photochemistry of CH3CN and CH3CONH2 on powdered TiO2
TL;DR: In this article, the adsorption and photochemistry of acetonitrile and acetamide on TiO2 have been studied by Fourier transform infrared spectroscopy (FTIR).
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Influence of Calcination Temperature on Activity and Selectivity of Ni–CeO 2 and Ni–Ce 0.8 Zr 0.2 O 2 Catalysts for CO 2 Methanation
TL;DR: In this article, the influence of calcination temperature (500-800°C) of Ni/CeO2 and Ni/ce0.8Zr0.2O2 catalysts on the specific surface area, pore volume, crystalline size, lattice parameter, chemical bonding and oxidation states, nickel dispersion and CH4/CO production rate in CO2 methanation was studied.
Journal ArticleDOI
Propane oxydehydrogenation over alumina-supported vanadia doped with manganese and potassium
TL;DR: In this article, the authors investigated the effect of vanadyl sites poisoning on the acid sites of the alumina support and found that the poisoning was due to the poisoning of acid sites that convert propene in a number of organic byproducts.
Journal ArticleDOI
Cobalt supported on zirconia and sulfated zirconia II. Reactivity of adsorbed NOx compounds toward methane
TL;DR: In this paper, the effect of sulfate ions in zirconia-supported cobalt catalysts on the reactivity of adsorbed NO x species toward methane was evaluated.
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