𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Electrocatalysts on supports—I. Electrochemical and adsorptive properties of platinum microdeposits on inert supports

✍ Scribed by V.S. Bagotzky; A.M. Skundin

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
894 KB
Volume
29
Category
Article
ISSN
0013-4686

No coin nor oath required. For personal study only.

✦ Synopsis

Adsorptive and electrocatalytic properties of platinum microdeposits on high-melting metals (Ti, Ta, Zr and Nb) and gold have been studied. It has been found that hydrogen adsorption on such microdeposits is characterized by some lower mean bond energy. Hydrogen spillover has been observed on the samples of high-melting metals, however, its intensity is less than for samples of carbon materials with platinum microdeposits. The rate of cathodic hydrogen evolution on the microdeposits is higher than on massive platinum and increases as the particle sizes of microdeposits decrease. The properties of microdeposits in terms of hydrogen adsorption and evolution have been the same for samples of all examined metals both in the initial state and after being oxidized in air at temperatures of 55M50K.

Oxygen adsorption on the microdeposits has been characterized by a slightly elevated bond energy and has exceeded that on massive platinum. The rate of oxygen ionization on the microdeposits has been much less than on massive platinum due to almost complete conversion of the microdeposits into PtO. The rate of formic acid oxidation on platinum microdeposits only slightly depends on the potential and is governed by the rate of chemisorption. The exchange current of the redox reaction Fe3* + e *Fe*+ on platinum microdeposits on gold exceeds that on pure platinum and increases as the mean particle size of the microdeposits decreases. The features of the microdeposits found arc explained by the assumption of their electronic interaction with support.

📜 SIMILAR VOLUMES

Electrocatalysts on supports—II. Compari
Electrocatalysts on supports—II. Comparison of platinum microdeposits on inert supports with other binary systems
✍ V.S. Bagotzky; A.M. Skundin 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 619 KB

The electrocatalytic properties of platinum microdeposits on supports are compared with ones of other binary systems, namely thin platinum films on glass carbon and Pt-Ru alloys. It is shown, that thin continuous platinum films have the same features as microdeposits, but homogeneous and heterogeneo

Hydrogen interactions and catalytic prop
Hydrogen interactions and catalytic properties of platinum-tin supported on zinc aluminate
✍ G. Aguilar-Ríos; M. Valenzuela; P. Salas; H. Armendáriz; P. Bosch; G. Del Toro; 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 572 KB

Pt-Sn/ZnA1204 catalysts prepared by two-step impregnation (first tin), with a Sn/Pt atomic ratio ranging from zero to 6.72, were characterized by hydrogen chemisorption, temperature-programmed reduction and tested in isobutane dehydrogenation. Metal dispersion correlates linearly with reaction rate;