DRIFT and mass spectrometric experiments on the chemistry and catalytic properties of small Ir clusters at the surfaces of polycrystalline α-Al2O3

Abstract

The DRIFT and mass spectra collected during eight high-temperature, high-pressure experiments are described and discussed. Relationships between the occurrence of aggregation–disaggregation reactions of Ir species on a low-surface-area polycrystalline α-Al₂O₃ and the formation of gaseous reaction product have been defined. Reactions in which carbidic oxidic and carbonyl species are interconverted have been produced and their role in CO and CO₂ hydrogenation is discussed. The results are compared with those previously found for Rh on α-alumina.