Activity and stability of palladium-resin supported catalyst

MARTÍN S. GROSS; CARLOS A. QUERINI

Río de Janeiro - Brasil

Congreso; 2º Congreso de Ingeniería Química del Mercosur - 4º Congreso del Mercosur de Ingeniería de Sistemas y Procesos; 2005

Metal supported on resins are catalysts used in several reacting systems. In this work, we study the water deoxygenation reaction, using palladium supported on ion-exchange resins, to produce water for example for beer industry, or for heating systems in order to avoid corrosion. The deactivation of these catalysts is a major issue, due to palladium lost and resin modification, mainly due to the cleaning-in-place procedure. The characterization of the resin is needed in order to know the state of the material during operation,  or to select a new support to improve the overall performance.  This information is obtained by the normalized ASTM tests, which specifies: total exchange capacity, salt splitting, water retention capacity and bead density.  Beside these, adsorption isotherms  using macro-porous resins were carried out. The stability of surface active groups were analyzed by exposing the ion-exchange resin to high temperatures and pH, simulating the cleaning in place procedure. Catalyst containing Pd supported on anionic weakly-basic macro-porous ion exchange resins, were prepared using palladium chloride.  The palladium is reduced with hydrazine. Catalyst characterization was made doing dynamic chemisorptions of CO,  and  Electron Probe Microanalysis (EPMA). The activity is measured in a fixed-bed system on reaction of water deoxygenation.  Different types of resins and different kind of competitive ions have been evaluated with this purpose, to improve the stability of the catalyst.