Abstract
A series of Rh/TbO x catalysts reduced at temperatures ranging from 623–973 K has been studied by means of X-ray diffraction, thermogravimetric analysis, volumetric adsorption temperature programmed desorption/reduction mass spectrometer (catharometer) techniques. All the catalysts consists of Rh/Tb 2O 3. No strong metal-support interaction effect could be observed. The decrease of the H/Rh ratio with the reduction temperature is interpreted as due to metal sintering. The amount of H 2 chemisorbed by the support is not larger than 2 H atom nm 2, thus suggesting a surface nature for this process.
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