MULTIFUNCTIONAL SKELETAL CATALYTIC SUPPORT 1. ALUMINA-BASED COMPOSITION FOR POROUS ADSORBING LAYER

Ceramic and metallic honeycombs present a great importance as catalytic substrates in processes that aim at the ecosystem protection. For an increased functionality of the substrate, the honeycomb surface has to be coated with a highly absorbing layer. The paper presents some of our results referring to the preparation and characterisation of alumina based composition that is to be used as porous adsorbing layer for coatings on metallic substrates. Sample of alumina based compositions were prepared from homogeneous mixtures consisting of y-Al2O3 (adsorbing material), boehmite (binding agent), nitric acid (peptising agent) and water (dispersing medium). Special attention was paid to alumina hydrate preparation and characterisation. The main characteristics of the boehmite type are summarised i.e. crystalline structure, thermal behaviour, FT-IR spectra and surface area.