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
Citations
More filters
Journal ArticleDOI
Heterogeneous reaction of formaldehyde on the surface of γ-Al2O3 particles
TL;DR: In this paper, the kinetics of the heterogeneous reaction of formaldehyde on the surface of γ-Al 2 O 3 was investigated in situ by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with ion chromatography (IC), X-ray diffraction (XRD), and field emission environmental scanning electron microscope (ESEM).
Journal ArticleDOI
Silica-supported silver catalysts modified by cerium/manganese oxides for total oxidation of formaldehyde
Tamara Kharlamova,Grigory V. Mamontov,M.A. Salaev,Vladimir I. Zaikovskii,Galina Popova,Vladimir I. Sobolev,Alexei Knyazev,Olga V. Vodyankina +7 more
TL;DR: In this article, a combination of silica support and a small amount of cerium/manganese oxides allows developing silver catalysts with defined micro-and macro-structure as well as high activity in the total oxidation of formaldehyde.
Journal ArticleDOI
Characterization and Catalytic Activity of CuCl2-Al2O3Ethylene Oxychlorination Catalysts☆
Elisabetta Finocchio,Nicoletta Rossi,Guido Busca,Mario Padovan,Giuseppe Leofanti,B. Cremaschi,Andrea Marsella,Diego Carmello +7 more
TL;DR: The negative role of uncovered alumina surface, evidenced by IR experiments, is considered to be responsible for the dehydrochlorination of 1,2-dichloroethane with a consequent loss in selectivity that is very important in low Cu loading samples as mentioned in this paper.
Journal ArticleDOI
Efficient transformative HCHO capture by defective NH2-UiO-66(Zr) at room temperature
Chizoba I. Ezugwu,Shuping Zhang,Shuping Li,Shi Shuangru,Chuanhao Li,Francis Verpoort,Francis Verpoort,Francis Verpoort,Jiaguo Yu,Shengwei Liu +9 more
TL;DR: In this paper, a record-high HCHO capture capacity was achieved in about ten minutes on defective NH2-UiO-66(Zr) nano-octahedra.
Catalytic performance of V2O5/ZrO2―Al2O3 for methanol oxidation
TL;DR: A bifunctional V 2 O 5 /ZrO 2 ―Al 2 O 3 catalyst of oxidation and dehydration was prepared by wet impregnation method and used in methanol oxidation.
Related Papers (5)
Infrared studies of the reactive adsorption of organic molecules over metal oxides and of the mechanisms of their heterogeneously-catalyzed oxidation
Infrared spectroscopic identification of species arising from reactive adsorption of carbon oxides on metal oxide surfaces
Guido Busca,Vincenzo Lorenzelli +1 more