K. Murtezaoglu et al., EFFECTIVE THERMAL-CONDUCTIVITY OF MONOLITHIC AND POROUS CATALYST SUPPORTS BY THE MOMENT TECHNIQUE, Journal of chemical and engineering data, 40(4), 1995, pp. 720-725
The axial and radial effective thermal conductivities of a monolithic
ceramic catalyst support and of porous alumina pellets were measured u
sing the moment technique. At 180 degrees C, radial and axial thermal
diffusivities were determined as 9.3 x 10(-3) and 11.1 x 10(-3) cm(2)
s(-1), respectively. Having pores being filled with hydrogen, the corr
esponding thermal conductivity values are 0.43 and 0.52 W . m(-1). K-1
, respectively. Experimental results obtained between 110 and 180 degr
ees C indicated a negligibly small dependence of effective thermal con
ductivities on temperature. A proposed model which included the geomet
rical parameters of the monolith and the thermal conductivity ratio of
the ceramic catalyst support to gas was shown to give excellent agree
ment with experimental results. Thermal conductivities of alumina pell
ets having bidisperse pore structures were also measured using this dy
namic procedure. Experimental effective thermal conductivity values ra
nged between 0.043 and 0.120 W . m(-1). K-1 for pellets having porosit
ies between 0.79 and 0.57, respectively.