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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Investigation on the Hydrocarbon and Oxygen-Containing Hydrocarbon Intermediates Leading to Crotonaldehyde Formation on TiO2
TL;DR: In this article, the authors show that the crotonaldehyde generated from the reactions of the four halogenated compounds on TiO2 has lower C═O and C═C stretching frequencies as compared to those generated directly from its adsorption.
Journal ArticleDOI
Nature of support plays vital roles in H2O promoted CO oxidation over Pt catalysts
TL;DR: In this article , a series of Pt nanoparticle catalysts supported on a set of TiO2-SiO2 composites with different molar ratios were prepared, characterized and their CO oxidation activities were evaluated under dry and humid conditions.
Journal ArticleDOI
Adsorption and Photo-Degradation of Organophosphates on Sulfate-Terminated Anatase TiO2 Nanoparticles
TL;DR: In this paper , the adsorption and photocatalytic degradation of trimethyl phosphate and triethyl phosphate (TEP), two environmentally relevant model pollutants, have been studied on commercial anatase TiO2 and sulfate-terminated anataseTiO2 nanoparticles by means of operando diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and 2D COS.
Journal ArticleDOI
Electronic Perturbation of Copper Single‐Atom CO <sub>2</sub> Reduction Catalysts in a Molecular Way
Journal ArticleDOI
Different Reactivity of Birnessite and Cryptomelane toward Isoprene: Effect of Structure, Morphology, and Exposed Faces
Peng-Fei Liu,Yilian Kong,Gaoling Wei,Xiaoliang Liang,Yuxi Liao,Can Wang,Quan Zhuang Ren,Tan Li,Min Fu,Steven L. Suib,Daiqi Ye +10 more
TL;DR: In this paper , the adsorption and oxidation of isoprene, the most abundant biogenic volatile organic compound, on two common Mn(IV) (hydr)oxides in Earth's surface environment, birnessite and cryptomelane, were investigated.
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