Temperature-dependent effective thermal conductivity and thermal diffusivity of catalysts and their supports in various gas media and in vacuum. 1. Thermal conductivity and thermal diffusivity of granular porous supports and catalysts

The basic characteristics of catalysis and their supports and the results of experimental studies of the thermal conductivity and thermal diffusivity of some supports and catalysts in the temperature range of 293–1073 K in vacuum (P=1.07 Pa) and in an atmosphere of air, argon, nitrogen, helium, hydrogen and in a gas mixture (0.2NH₃+0.3N₂+0.5H₂) are reported. It is established that as the temperature rises in the all gas media and in vacuum the thermal conductivity and thermal diffusivity of a burden of the catalysts and their supports increase according to a linear law and depend on the size and shape of the granules rather than on their specific surface.K. Dzhuraev Pedagogical University, Dyushambe, Uzbekistan. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 68, No. 5, pp. 799–809, September–October, 1995.