The gas phase dichloromethane hydrodechlorination was studied in the absence and in the presence of traces of chloroform and tetrachloroethylene over 0.3-0.7 wt.% Pd supported on commercial alumina or sol-gel titania. Turnover frequencies (TOFs), rate constants, reaction orders and activation energies were determined. Catalysts with the higher palladium loadings on both supports were much more active. A decreased activity was observed when traces of chloroform or tetrachloroethylene were added to the feed stream. However, the deactivation effect was lower over alumina-supported catalysts. Selected catalysts were characterized by chemical analysis, BET, chemisorption, TGA and TPR. (c) 2007 Elsevier B. V. All rights reserved.