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
Photocatalytic Formaldehyde Oxidation over Plasmonic Au/TiO2 under Visible Light: Moisture Indispensability and Light Enhancement
Xiaobing Zhu,Can Jin,Xiao-Song Li,Jing-Lin Liu,Zhi-Guang Sun,Chuan Shi,Xingguo Li,Ai-Min Zhu +7 more
TL;DR: In this paper, the authors demonstrate photocatalytic oxidation of formaldehyde in air over plasmonic Au/TiO2 catalyst under visible light in a single-pass continuous flow reactor.
Journal ArticleDOI
FTIR study of adsorption and reactions of methyl formate on powdered TiO2
TL;DR: In this paper, an orthoester-type intermediate was proposed to explain the observed infrared absorption bands, and the origins of the gas products relating to the adsorbed species were also discussed.
Journal ArticleDOI
Participation of surface bicarbonate, formate and methoxy species in the carbon dioxide methanation catalyzed by ZrO2-supported Ni
TL;DR: In this paper, ZrO2-supported Ni samples were prepared by an impregnation method and tested as catalysts for CO2 methanation, and infrared spectra recorded during catalysis show that CO2 was initially adsorbed in the form of carbonate and bicarbonate species bonded to sites of the support.
Journal ArticleDOI
The Importance of Cannizzaro-Type Reactions during Electrocatalytic Reduction of Carbon Dioxide
TL;DR: A seemingly catalytically inactive electrode, boron-doped diamond (BDD), is found to be active for CO2 and CO reduction to formaldehyde and even methane, and the results obtained here may explain the concomitant formation of acids and alcohols often observed during CO2 reduction.
Journal ArticleDOI
Hydrogenation of CO2 to Methanol by Pt Nanoparticles Encapsulated in UiO-67: Deciphering the Role of the Metal–Organic Framework
Emil Sebastian Gutterød,Andrea Lazzarini,Torstein Fjermestad,Gurpreet Kaur,Maela Manzoli,Silvia Bordiga,Silvia Bordiga,Stian Svelle,Karl Petter Lillerud,Egill Skúlason,Sigurd Øien-Ødegaard,Ainara Nova,Unni Olsbye +12 more
TL;DR: The study provides firm evidence that methanol is formed at the interface of Pt NPs and linker-deficient Zr6O8 nodes resting on the Pt NP surface, via formate species attached to the Zr nodes.
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