Mixed oxides of transition metals as catalysts for total ethanol oxidation

Abstract

Oxides of transition metals could be suitable alternatives to catalysts based on noble metals in the oxidation processes used for the abatement of volatile organic compounds. Mixed oxides of transition metals can exhibit good efficiency and thermal stability, as well as being inexpensive. In this work, oxide catalysts containing various combinations of Cu, Co, Ni, Mn, and Al, grained or supported on oxidised aluminium foil Al2O3/Al, were studied in terms of their chemical and physical properties, including their chemical composition, porous structure, phase composition, reducibility, and activity in total ethanol oxidation. Ternary co-precipitated catalysts in the form of grains obtained from layered double hydroxide-like precursors were highly active, especially those containing manganese. Deposition of the selected precursors on an anodised aluminium foil-support afforded less active catalysts, mainly because the required metal molar ratios were not achieved, and insufficient amounts of metals were deposited. However, by controlling the preparation conditions (pH), higher loading of active components and higher catalytic activity were obtained.

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

“…The higher cobalt concentration in the analyzed Co samples is in agreement with the literature data on higher impreg nation capacity of cobalt nitrate as compared to that of copper nitrate [19]. A smaller amount in the case of cerium must be caused by lower concentration of the impregnation solution (0.5 mol/L Ce(CH 3 COO) 3 ).…”

“…Catalysts based on oxides of transition metals and rare earth elements (REEs) continue to find extensive application in oxidation reduction reactions [1][2][3][4][5]: here, REE oxides serve as both oxygen accumulators [6] and texture promotors [7]. In practice, multicom ponent oxide catalysts are usually applied [4,5,[8][9][10].…”

Hydrotalcite derived (Cu, Mn)–Mg–Al metal oxide systems doped with palladium as catalysts for low-temperature methanol incineration

“…Kovanda et al, 2001;Chmielarz et al, 2012) and CuMn-containing catalysts for VOC incineration (e.g. Zimowska et al, 2007;Cheng et al, 2008;Palacio et al, 2010;Aguilera et al, 2011;Jirátová, 2011a, 2011b;Ludvíková et al, 2012). For example, the catalytic behavior of Cu-Mn-Al (Cu:Mn:Al = 3.0:3.0:1.0) mixed metal oxide in total oxidation of toluene was studied by Palacio et al (2010).…”

RH and H2 Production in Reactions between ROH and Small Molybdenum Oxide Cluster Anions

“…x y x y 1 (11) where N Mo x O y − and N ROH represent the number densities of the clusters and ROH. The reactor residence time is not directly controlled in this experiment; rather, the alcohol number density is controlled by the initial ROH concentration in the mix tank supplying the reactant to the reaction channel and by the valve II pulse duration.…”