Synthesis of Pd/Al2O3 coating onto a cordierite monolith and its application to nitrite reduction in water

The catalytic properties of Pd/Al2O3 coating onto cordierite monolith channels for the nitrite reduction in water were studied. This coating was synthesized producing an alumina layer via washcoat and adding the palladium species to this layer by immersion into a PdCl2 solution. Different characterization techniques, XRD, XPS, SEM and EDX were used to study the physicochemical and morphological properties of the catalytic coatings. The comparison of these results along with the catalytic behaviors allowed comprehension of Pd active sites and their way of acting. The structured catalyst so obtained was active and stable in the nitrite reduction.

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► Was obtained a coating of Pd/Al2O3 onto cordierite monolith walls
► Evaluates its catalytic properties for the nitrite reduction of the water
► Was possible to obtain higher selectivity to nitrogen
► By XPS could determine the formation of redox couple in the Pd species in the reaction
► The coating does not lose during batch reaction conditions.