ChemInform Abstract: Metal and Coated‐Metal Catalysts

Abstract

Metal and Coated-Metal Catalysts -[54 refs.]. -(TWIGG, M. V.; WEBSTER, D. E.; Chem. Ind. (Dekker) 71 (1998) 59-90; Johnson Matthey, Catal. Syst. Div., Royston, Hertfordshire SG8 5HE, UK; EN)

Monolithic reactors for environmental applications

“…Pulsate flow and vibrations produce the deformation of the center of the cylindrical rolled monoliths that are pushed out during use (telescoping) [191]. This phenomenon can be prevented by forcing pins through the layers perpendicular to the channels, or using various forms of welding [192] and brazing between layers or across one or both end faces [193].…”

Preparation of NiO Catalyst on FeCrAl Substrate Using Various Techniques at Higher Oxidation Process

“…In order to accommodate the catalyst in significant amounts, substrate must be provided with a high surface area. Twigg & Webster (2006) suggest that the design of substrate must provide a maximum superficial surface area which accommodates to the exhaust gas, as it is upon this surface that the catalytic coating is applied, and on which the pollutant and reactant gases must impinge in order to react.…”

“…The first one is a substrate, a support for catalyst material. The FeCrAl is generally considered as metallic substrates due to their advantage in the high-temperature corrosion resistance, including the strong adherence of oxide film on the surface of substrate when applied the appropriate surface treatment (Twigg & Webster, 2006;Pilone, 2009;Klower et al, 1998;Cueff et al, 2004;Badini & Laurella;Czyrska-Filemonowicz et al, 1999;Liu et al, 2001;Amano et al, 2008;Checmanowski & Szczygiel, 2008). This material is based on ferritic steels with 5-8 wt% aluminium, 17-22 wt% chromium, plus small additions of reactive elements, which are added to improve the oxidation resistance and oxide adhesion (Nicholls & Quadakkers, 2002).…”