Tauster, S. J.; Fung, S. C.; Garten, R. L.

Journal of the American Chemical Society (1978), 100(1), 170-5 CODEN: JACSAT; ISSN: 0002-7863. English.

The reduction of noble metals supported on TiO2 at low temps. (200.degree.) produces well-dispersed metals which exhibit the capacity to sorb both hydrogen and carbon monoxide. Redn. of the same materials at 500.degree., however, decreases hydrogen and carbon monoxide sorption to near zero in all cases. Electron microscopy and x-ray diffraction show that the loss of this sorption capacity is not due to metal agglomeration. This effect for well-dispersed metals is evidence for a chem. interaction between the noble metal and the support. The nature of the interaction is discussed in terms of metal-metal bonding between the noble metal and titanium cations or, alternatively, the formation of intermetallic compds.