The Chemisorption of Oxygen and the Oxidation of Carbon Monoxide on Metals

Abstract

Data on the chemisorption of oxygen on a number of metals (Pt, Pd, Ir, Ru, Ni, etc.), obtained by SED, EAS, XES, etc., have been reviewed. The bond energies and principal properties of the two types of O ads on metals (non-reconstructive and reconstructive), and also the conditions for the realisation of each type of adsorption, have been examined. The bibliography contains 84 references. CONTENTS

Influence of Mono- and Bimetallic PtOx, PdOx, PtPdOx Clusters on CO Sensing by SnO2 Based Gas Sensors

“…The selectivity of heterogeneous catalysts of oxidative processes is determined by the energy of adsorption of the reducing gas, the binding energy with surface oxygen (which is an oxidizer) and binding energies with intermediates and reaction products. In CO oxidation, the optimal catalysts are palladium (Pd) and platinum (Pt), since the energy of chemisorption of oxygen on the clusters of these metals (340–360 kJ/mol) is close to the binding energy of CO with their surface [ 9 , 10 ]. Palladium and platinum are some of the most effective modifiers for improving the sensor properties of semiconductor metal oxides in CO detection [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”