On the selection of the catalyst among the commercial platinum-based ones for total oxidation of some chlorinated hydrocarbons

Catalytic total oxidation of some selected chlorinated hydrocarbons is studied with several Pt-based catalysts. Chlorinated hydrocarbons used have been ethyl chloride, trichloroethylene and dichloromethane, alone or mixed with some hydrocarbons, such as toluene. Eighteen different catalysts have been tested from eight different manufacturers (Degussa AG, Sud-Chemie AG, Kataleuna GmbH, Chimet, Johnson Matthey, Prototech Co.,...) and from three research institutions (Universities of Leiden (NL) and Wroclaw (PL) and Spanish CSIC-ICP). Catalysts both in the form of spheres (particulates) and of monoliths are used. Selection of the best catalyst(s) is made based on their activity, selectivity and life. Apparent energies of activation for these reactions on these catalysts, using an empirical first-order reaction rate, are given. There are interesting or noticeable differences in activity and selectivity among the tested Pt-based catalysts. In overall they are not so active as the chromia and vanadia-based catalysts but they have an high life, reason why they can be recommended for this application. (C) 2000 Elsevier Science B.V. All rights reserved.