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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Hierarchical Ni−Al hydrotalcite supported Pt catalyst for efficient catalytic oxidation of formaldehyde at room temperature
TL;DR: In this paper, a flower-like hierarchical Pt/NiAl-LDHs with different [Ni2+]/[Al3+] molar ratios were synthesized via hydrothermal method followed by NaBH4 reduction of Pt precursor at room temperature.
Journal ArticleDOI
Water and carbon oxides on monoclinic zirconia: experimental and computational insights
Sonja Kouva,Jenni Andersin,Karoliina Honkala,Juha Lehtonen,Leonardus Lefferts,Leonardus Lefferts,Jaana Kanervo +6 more
TL;DR: It is shown that reducing and hydrating pretreatments affect the surface sites on monoclinic zirconia, and a new weak reversible binding state of CO is found exclusively on ZrO2 that is first reduced and subsequently hydrated.
Journal ArticleDOI
Visible light-driven enhanced CO2 reduction by water over Cu modified S-doped g-C3N4
TL;DR: In this paper, the photocatalytic performance of the as-synthesized sheets was systematically studied for gas-phase CO2 reduction using water at room temperature under visible light illumination.
Journal ArticleDOI
Formaldehyde and acetaldehyde adsorption properties of heat-treated rice husks
TL;DR: Rice husk (RH) was converted into an adsorbent to remove two types of aldehyde vapor in this paper, which showed the fastest decrease in formaldehyde and acetaldehyde concentrations in the bags.
Journal ArticleDOI
Isobutane dehydrogenation on zirconia-, alumina-, and zirconia/alumina-supported chromia catalysts
TL;DR: In this paper, the performance of zirconia-, alumina-, and chromia/alumina-supported chromia catalysts was investigated in the dehydrogenation of isobutane in order to elucidate the role of the support material in the degradrogenation reaction.
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