Catalysis of the water–gas shift reaction by [Rh(COD)(4-picoline)2]PF6 immobilized on poly(4-vinylpyridine): Characterization of the catalyst and the effect of temperature under continuous-flow conditions Original Research Article

The effect of temperature on the water–gas shift reaction, catalyzed by poly(4-vinylpyridine) immobilized [Rh(COD)(4-picoline)2]PF6 (COD=1,5-cyclooctadiene), has been studied under continuous-flow conditions at 100–180°C. The morphology of the immobilized catalyst was studied using a scanning electron microscope. The immobilized catalyst was also characterized by DTA–TGA analysis, FT-IR, UV–VIS reflectance, electron paramagnetic spectroscopy (EPR) and X-ray photoelectron spectroscopy (XPS), and surface area was determined by the BET method. The temperature dependence follows a segmented Arrhenius behavior. These results are discussed in terms of the possible presence of mono- and polynuclear-anchored rhodium species.