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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Journal ArticleDOI
The Active Molybdenum Oxide Phase in the Methanol Oxidation to Formaldehyde (Formox Process): A DFT Study
TL;DR: A density functional theory based study indicates the unique character of Mo(VI)¢Mo(IV) pairs as the most active and selective sites and indicates the active sites on the surface, the controlling factors of selectivity, and the role of the dopant.
Journal ArticleDOI
Synchronous pore structure and surface hydroxyl groups amelioration as an efficient route for promoting HCHO oxidation over Pt/ZSM-5
TL;DR: In this article, a facile way for simultaneously enhancing HCHO adsorption, storage and oxidation over Pt/ZSM-5 by aqueous NaOH treatment, as well as synchronous pore structure and surface hydroxyl groups amelioration.
Journal ArticleDOI
In Situ Pt Photodeposition and Methanol Photooxidation on Pt/TiO2: Pt-Loading-Dependent Photocatalytic Reaction Pathways Studied by Liquid-Phase Infrared Spectroscopy
Greta Marie Haselmann,Bettina Baumgartner,Jia Wang,Karin Wieland,Tushar Gupta,Christopher Herzig,Andreas Limbeck,Bernhard Lendl,Dominik Eder +8 more
TL;DR: In this article, a top-irradiated, liquid-phase attenuated total reflectance Fourier transform infrared (ATR-FTIR) setup was developed that allows time-resolved investigations of both Pt particle growth during in siamese particle growth.
DissertationDOI
Carbon dioxide adsorption on nanomaterials
TL;DR: In this article, the formation of carbonate and bicarbonate on the external surface of nano NaY zeolites, suggesting unique sites for CO2 adsorption on the surface of these small nanomaterials.
Journal ArticleDOI
Surface reactivity of NiO/Co3O4 and Fe2O3/Co3O4 nanocomposite catalysts: interaction with methanol
TL;DR: In this paper, the reactivity of two nanocomposite supported oxides (NiO/Co3O4 and Fe2O3/Co 3O4) toward methanol, was studied at atmospheric pressure and under high vacuum conditions.
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