Bi modified Pd/support (SiO2, Al2O3) catalysts for hydrodechlorination of 2,4-dichlorophenol

The influence of bismuth addition on the activity and selectivity of home-made supported palladium catalysts in the reaction of hydrodechlorination of 2,4-dichlorophenol to phenol was studied. Bimetallic Pd–Bi/Al2O3 and Pd–Bi/SiO2 catalysts, containing 5 wt.% of Pd and 1–5 wt.% of Bi, are characterized by high conversion of 2,4-dichlorophenol, which reaches about 100% at the end of the reaction run. However, the catalysts 5%Pd–8%Bi/SiO2 and 5%Pd–8%Bi/Al2O3 show considerably lower conversion (respectively, about 25% and 60%), but they are characterized by the highest selectivity towards phenol (respectively, about 95% and 60%). The stability of the chosen bimetallic catalyst 5%Pd–1%Bi/Al2O3 is higher than that of the monometallic palladium catalyst. The XRD and ToF-SIMS studies proved the presence of intermetallic compounds BiPd and Bi2Pd, which probably modify the catalytic properties of Pd–Bi/support catalysts in hydrodechlorination of 2,4-dichlorophenol.

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