Selective oxidation of glucose to gluconic acid over bimetallic Pd-Me catalysts (Me = Bi, Tl, Sn, Co)

Catalytic properties of bimetallic Pd-Bi, Pd-Tl, Pd-Sn, and Pd-Co catalysts supported on C (from plum stones) and SiO(2) were studied in the reaction of glucose oxidation to gluconic acid. Catalysts modified with Bi show the best selectivity and activity. The results obtained from research on 5% Pd-5% Bi/C and 5% Pd-5% Bi/SiO(2) catalytic systems were compared with the results for a commercial catalyst containing 1% Pt-4% Pd-5% Bi supported on active carbon (Degussa). For both Pd-Bi/support catalysts and 1% Pt-4% Pd-5% Bi/C, similar selectivity in the reaction of glucose oxidation was observed. XRD studies proved the presence of intermetallic compounds BiPd and Bi(2)Pd, which probably increase the selectivity of PdBi/SiO(2) catalysts.