Hans Juergen Schoennagel

The stoichiometry of hydrogen and CO chemisorption on Irγ-Al2O3

The stoichiometry of hydrogen and carbon monoxide chemisorption on Irγ-Al2O3 was examined at metal loadings of 0.2–1.0 wt%. Using temperature programmed desorption (TPD), up to two atoms of hydrogen were found to be chemisorbed per iridium atom. This is in agreement with CO adsorption results which indicated the chemisorption of up to two CO molecules per iridium atom. The TPD of hydrogen followed second-order kinetics indicating that chemisorption occurs dissociatively upon iridium. The activation energy for desorption of hydrogen was found to be in the range of 11–17 kcal/g mol.