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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Temperature-programmed methods for probing surface interactions on catalytic oxide materials
TL;DR: Kouva et al. as mentioned in this paper used temperature-programmed surface reaction (TPSR) and infrared spectroscopy (IR) in an extensive temperature range (100-550 oC) in addition to density functional theory (DFT).
FTIR study of methanol decomposition on gold catalyst for fuel cells
TL;DR: In this article, the authors investigated the interaction of methanol, water and formaldehyde on Au/TiO2 catalysts at different temperatures and showed that different coordinated methoxy species, that is on top species adsorbed on oxygen vacancy sites and bridged species on two Ti 4þ ions, are produced in all the mixtures.
Dissertation
New insights on the selective oxidation of methanol to formaldehyde on FeMo based catalysts
TL;DR: In this article, the authors investigated the surface active sites responsible for the selective oxidation of methanol, with particular focus on gaining insights into surface active sights responsible for directing the selectivity to formaldehyde.
Dissertation
Identification, stability and reactivity of NOx adsorbed species on titania-supported manganese catalysts
TL;DR: In this article, the Department of Chemistry and the Institute of Engineering and Sciences of Bilkent University, Turkey, have published a paper called "Ankara: Chemistry and Engineering in Turkey".
Journal ArticleDOI
Flower-like Co3O4 Catalysts for Efficient Catalytic Oxidation of Multi-Pollutants from Diesel Exhaust
TL;DR: In this paper , nanoflower-like Co3O4 diesel oxide catalysts were fabricated with the addition of a low-content Pt to trigger better catalytic activities for oxidizing multi-pollutants (CO, C3H6, and NO) emissions by taking advantage of the strong metal supporting interaction.
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