Page 331 - Adsorptionbypowders & poroussolids muyace
P. 331
CHAPTER 10. ADSORPTION BY METAL OXlDES 321
of the products are usually complex. As in other thermal decomposition studies,
control of the dehydration reactions and sinteringlageing processes is considerably
improved by the application of CRTA (controlled rate thermal analysis), together
with the use of finely divided and well-characterized gibbsite. In this manner,
Rouquerol and co-workers (Rouquerol et al., 1975, 1979a; Rouquerol and
Ganteaume, 1975) were able to obtain the results in Figures 10.17 and 10.18 and
hence extend the work of Papde.
Figure 10.17. Development of the BET-nitrogen surface area during the dehydration, by CRTA, of a
sample of fine gibbsite, 1 pm gram size. CRTA conditions: controlled pressure indicated in mbar on the
curve; rate of dehydration, 11.4 mg h-' g-' (Rouquerol and Ganteaume, 1977).
