Abstract
Low temperature FT-IR spectroscopy has been utilized to study the adsorption and thermal decomposition of NO on Al 2O 3 and Al 2O 3-supported palladium. At 110 K the nitric oxide adsorbs molecularly and reversibly via H-bonding to isolated surface OH groups forming the (NO) 2 dimer. The dimer formation was characterized by symmetric and antisymmetric ν(NO) stretching modes at 1871 and 1761 cm −1, respectively. However, upon warming the adsorbed (NO) 2 dimer decomposes to form adsorbed nitrous oxide. The reactive species is thus shown to be the adsorbed dimer, which cannot be formed at temperatures greater than 140 K for lack of H-bonding. As the palladium loading is increased, there is a gradual decrease in (NO) 2 dimer formation with an increase in chemisorbed Pd–NO because of adsorption site transfer from Al 2O 3 to Pd.
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