Af. Cannestra et al., MEASUREMENT OF GAS-COMPOSITION AT THE CENTER OF A POROUS PELLET DURING ADSORPTION AND CATALYTIC REACTION UNDER DYNAMIC CONDITIONS, Journal of catalysis, 172(2), 1997, pp. 346-354
Gas composition is measured at the center of one-dimensional porous pl
atinum/alumina pellets during carbon monoxide adsorption and catalytic
oxidation. The apparatus is based on a single-pellet diffusion reacto
r that has been modified to allow continuous gas analysis and miniatur
ized in order to reduce the time constants of gas flow and mixing. Ana
lysis of the CO adsorption response demonstrates that the centerplane
volume and sample leak perturb the system only slightly and in a manne
r that can be accounted for during data analysis. A detailed kinetic m
odel described previously is able to predict the qualitative features
of the external concentration responses during carbon monoxide oxidati
on. However, the model is not able to predict major features of the re
sponses measured at the pellet center, demonstrating that the reactor
is able to provide stricter tests of kinetic models than reactors in w
hich only external compositions can be measured. (C) 1997 Academic Pre
ss.