Influence of crystal structure of Y-doped ZrO<sub>2</sub> as support oxide on the three-way catalytic performance of supported Rh catalyst

The effect of crystal structure Y-doped ZrO2 as support on the three-way catalytic performance Rh catalyst was investigated. supported 3Y-ZrO2 with tetragonal phase showed higher activity than that 3Y/ZrO2 monoclinic phase. difference in Rh–support oxide interaction suspected from measurements temperature-programmed reduction by CO (CO-TPR). use found to contribute formation easily reducible species, resulting high activity. species can more strongly interact 3Y-ZrO2, catalytically active Rh/3Y-ZrO2, which highest From Fourier transform infrared (FT-IR) spectroscopy following adsorption, no qualitative surface valence state particles irrespective crystallite observed. On other hand, a large fraction Rh/3Y-ZrO2 be Rh0 sites rather Rh+ sites. This is related Y 3Y-ZrO2. We concluded via key-factor obtain highly catalysts.