Glycerol oxidation in liquid phase: Highly stable Pt catalysts supported on ion exchange resins

GROSS, M.S.; SANCHEZ, B.S.; QUERINI, C.A.

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 501 p. 1 - 9

0926-860X

The glycerol oxidation reaction in liquid phase was studied using platinum supported on ion exchangeresin as catalysts, with the objective of obtaining glyceric acid. In particular, the effect of the competitoranion, which is the ion used during the support pre-treatment, was addressed. It was found that thecompetitor ion affects the radial distribution of the active metal in the resin sphere. As the adsorptionequilibrium constant ofthe competitor ion increases,the penetration of platinum in the resin particle alsoincreases. Nevertheless,this difference did not affectthe catalytic performance. However,the presence ofiodide as competitor ion affected the platinum chemical environment,thus modifying the platinum activesites in this catalyst. Such effect was not observed when chloride or citrate ions were used for the resinpretreatment. Therefore, the competitor ion effect on the platinum catalysts performance is related withthe ion nature more than with its affinity for the resin exchange sites. Iodide is adsorbed by platinum, andconsequently, it affects its electronic state improving the selectivity. These catalysts showed very goodactivity, and what is also very important, very good stability, being possible to maintain the conversionand selectivity for many reaction cycles.