Protonic conductivity of PtrAl O in hydrogen- and 2 3 water-containing atmospheres

Changes of electrical properties of a 0.5% PtrAl2O3 catalyst and of g-Al2O3 measured in situ during temperature programmed hydrationrdehydration have been correlated with TG–DSC data, obtained in similar conditions. The results are explained in terms of hydrogen spillover to the support facilitated by the presence of traces of water protonic conduction by ‘‘ vehicle’’ mechanism.. q2000 Published by Elsevier Science B.V. All rights reserved.