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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Study of the effect of ceria on the activity and selectivity of Co and Ce co-doped birnessite manganese oxide for formaldehyde oxidation
TL;DR: In this paper , the results from in-situ DRIFTS confirmed the formation of methoxy species in the presence of CeO2, which are intermediates for methanol generation.
Journal ArticleDOI
Precursor Effect on the Molecular Structure, Reactivity, and Stability of Alumina-Supported Vanadia
TL;DR: In this paper, the influence of specific vanadium precursors on alumina-supported vanadium oxide catalysts was studied by 51V-NMR, UV−vis, and Raman spectroscopy.
Journal ArticleDOI
Transient response study of the formaldehyde oxidation to formic acid on V–Ti–O catalyst: FTIR and pulse study
TL;DR: The mechanism of formaldehyde oxidation to formic acid on a V-Ti-O catalyst has been studied by pulse and spectrokinetic (in situ FTIR) methods as discussed by the authors.
Journal ArticleDOI
Study of the effect of ceria on the activity and selectivity of Co and Ce co-doped birnessite manganese oxide for formaldehyde oxidation.
Abubakar Yusuf,Zhenzhen Yang,Yong Sun,Shuai Liu,Chengjun Wang,Yong Ren,Hang Xiao,Colin E. Snape,Jun He +8 more
TL;DR: In this article, the results from in-situ DRIFTS confirmed the formation of methoxy species in the presence of CeO2, which are intermediates for methanol generation.
Journal ArticleDOI
Adsorption and Photooxidation of Formamide on Powdered TiO2
TL;DR: In this article, Fourier-transformed infrared spectroscopy was used to study the photooxidation of formamide on TiO2 and showed that CO2 formation mainly results from NCO(a) photodecomposition.
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