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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On the nature of the active Au species: CO oxidation on cyanide leached Au/TiO2 catalysts
TL;DR: In this article, the influence of different gold oxidation states on the CO oxidation activity at 80°C on structurally well defined Au/TiO2 (P25) catalysts was studied.
Journal ArticleDOI
Elucidation of Active Sites in Aldol Condensation of Acetone over Single-Facet Dominant Anatase TiO2 (101) and (001) Catalysts.
Fan Lin,Huamin Wang,Yuntao Zhao,Jia Fu,Donghai Mei,Donghai Mei,Nicholas R. Jaegers,Nicholas R. Jaegers,Feng Gao,Yong Wang,Yong Wang +10 more
TL;DR: A deep understanding of the reaction mechanisms, kinetics, and structure–function relationships for vapor phase acetone aldol condensation is provided through the controlled synthesis of two catalysts with high surface areas and clean, dominant facets, coupled with detailed characterization and kinetic studies that are further assisted by density functional theory (DFT) calculations.
Journal ArticleDOI
The removal of low concentration formaldehyde over sewage sludge char treated using various methods
TL;DR: Sewage sludge char was activated, using several different methods, to be used for the adsorption of formaldehyde as mentioned in this paper, which was shown to have better performance than activated carbon.
Journal ArticleDOI
Computational insights into reduction of the Phillips CrOx/SiO2 catalyst by ethylene and CO
Maciej Gierada,Jarosław Handzlik +1 more
TL;DR: The mechanism of the Phillips CrOx/SiO2 catalyst with ethylene is still not determined as mentioned in this paper, but it is predicted that the most kinetically favored reduction mechanism involves the reaction between ethylene and both oxo ligands of the surface dioxo Cr(VI) species, leading to formation of Cr(II) site and two formaldehyde molecules.
Journal ArticleDOI
Reaction of methanol on stoichiometric and O-terminated α-Cr2O3 (): interconversion of oxygenated C1 surface intermediates
TL;DR: The reaction of methanol on the nearly stoichiometric α-Cr2O3 (1 0 1 2 ) surface gives a spectrum of products including CH4, CH2O, CO, CO2 and H2 as discussed by the authors.
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