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

The effect of temperature on the water-gas shift reaction, catalyzed by pol y(4-vinylpyridine) immobilized [Rh(COD)(4-picoline)(2)]PFs (COD=1,5-cyclooc tadiene), has been studied under continuous-flow conditions at 100-180 degr ees C, The morphology of the immobilized catalyst was studied using a scann ing electron microscope. The immobilized catalyst was also characterized by DTA-TGA analysis, FT-IR, UV-VIS reflectance, electron paramagnetic spectro scopy (TPR) and X-ray photoelectron spectroscopy (XPS), and surface area wa s determined by the BET method. The temperature dependence follows a segmen ted Arrhenius behavior. These results are discussed in terms of the possibl e presence of mono- and polynuclear-anchored rhodium species. (C) 2000 Else vier Science B.V. All rights reserved.