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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Oxidation of Formaldehyde to Formic Acid over V2O5/TiO2 Catalysts : A DFT Analysis of the Molecular Reaction Mechanisms
TL;DR: In this article, the authors studied the formation of formaldehyde to formic acid on the surface of titania-supported vanadia with density functional theory (DFT) and a dioxo-vanadyl (O═V−O−V═O) catalyst model.
Journal ArticleDOI
A theoretical study of dioxymethylene, proposed as intermediate in the oxidation of formaldehyde to formate over copper
TL;DR: In this paper, the density functional theory-based hybrid method B3LYP was used to study the interaction of the dioxymethylene species with the copper (111) surface.
Journal ArticleDOI
Gold supported on ceria doped by Me3+ (Me = Al and Sm) for water gas shift reaction: Influence of dopant and preparation method
Donka Andreeva,Margarita Kantcheva,Ivan Ivanov,Lyuba Ilieva,Janusz W. Sobczak,Wojciech Lisowski +5 more
TL;DR: In this paper, the influence of the preparation method, as well as the nature of dopants on the structure, properties and WGS activity of gold catalysts supported on ceria doped by Sm and Al were investigated.
Journal ArticleDOI
The role of Nb in the formation of sulphonic species in SBA-15 and MCF functionalised with MPTMS
TL;DR: In this article, mesoporous silica and niobiosilicate materials of SBA-15 and MCF types were prepared in the presence of MPTMS, i.e. (3-mercaptopropyl)trimethoxysilane and hydrogen peroxide.
Journal ArticleDOI
The role of niobium in MCM-41 supported with Pt and Au—A comparative study of physicochemical and catalytic properties
TL;DR: In this article, a series of results on niobium mesoporous molecular sieves of MCM-41 type modified with noble metals (Pt, Au) were presented, where gold is incorporated by two methods: during the synthesis by co-precipitation and by impregnation (IMP).
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