Abstract

GARCIA M., C. et al. Evaluation of mono and bimetallic catalysts supported on Al₂O₃-TiO₂ in the reaction of hidrodechlorination of 1,2-dichloroethane. Rev. Mex. Ing. Quím [online]. 2012, vol.11, n.3, pp.463-468. ISSN 1665-2738.

The effect of Pd, Pi, Rh and the bimetallic PdPt (Pd/Pt=4) as active phases for the gas-phase hydrodechlorination of 1,2 dichloroethane was studied. An Al₂O₃-TiO₂ mixed oxide with atomic ratio Al/Ti=25 (AT) and Al₂O₃ (A) were used as carriers. These materials were prepared by the sol-gel method and characterized by nitrogen physisorption to obtain their textural properties (BET Area, pore volume & average pore diameter). Active phases were impregnated with a metallic load of 1 wt.-%. Reactions were carried cent in a fixed-bed differential reactor at 250 °C and atmotpheric pressure. Titania-modified support showed a BET área of 422 m²/g slightly higher than A (374 m²/g). Reaction rate for tested supported AT catalysts resulted in order of activity as follows Pt<Rh<Pd<PdPt and in terms of selectivity towards non-chlorinated compounds the order was Pd<Pt<PdPt<Rh. The PdPt/AT catalyst presented a catalytic activity 15% higher than PdPt/A.

Keywords : hydrodechlorination; rhodium; Pd-Pt; alumina-titania; 1,2-dichloroethane.