nitrogen molecule in the adsorbed state is 16.2 Å 2 . Pore volumes and poresizedistributions were determined by the BJH method.
The beads were also examined using an atomic force microscope, AFM Nanoscope III (Digital Instruments, USA) operating
Authors:Edjane F. B. Silva, Marcílio P. Ribeiro, Ana C. F. Coriolano, Ana C. R. Melo, Anne G. D. Santos, Valter J. Fernandes Jr., and Antonio S. Araujo
temperature of 77 K on a Quantachrome equipment NOVA-2000 model. Prior to adsorption measurement, the sample was degassed at temperature of 300 °C for 2 h. The specific surface area was determined by the BET method and the poresizedistribution was estimated
Authors:Sulene Araújo, Antonio Araujo, Nedja Fernandes, Valter Fernandes, and Massao Ionashiro
adsorption isotherm and poresizedistribution for MCM-41
The analysis by scanning electron microscopy was carried out in order to observe the morphology of the material. It can be observed in Fig. 3 that the sample of
the sample without application in the reaction. The micropores deceased to 22 %, while the mesopores increased to 56 %.
Surface areas, pore volumes and poresizedistributions of catalysts activated at
the evaporable water. The capillary porosity and pore-sizedistribution were investigated by mercury intrusion porosimetry carried out with a Micromeritics Pore Sizer IV 9600 V1.05, in a pressure range of 0.5-33000 psia
in an MCM-41 type material [ 19 ]. Figure 4 shows poresizedistributions for the calcined FA-derived F-MCM-41 materials. The poresizedistribution for these samples, as calculated by the BJH method, shows a sharp peak at about 2.7 nm for the F
Authors:D. Meloni, M. F. Sini, M. G. Cutrufello, R. Monaci, E. Rombi, and I. Ferino
and 0.54 cm 3 g −1 for MgNiAl(4.05). Pore-sizedistribution plots (not shown) exhibited an unimodal pore distribution centered at 3.8 nm.
The TPR profile of MgNiAl(4.05) is reported in Fig. 2 . It shows a sharp peak at 713 K, which merges
Brutsaert, W., 1966. Probability laws for poresizedistributions. Soil Sci. 117. 311–314.
Comegna, V., Damiani, P. & Somella, A., 1998. Use of a fractal model for determining soil water retention curves. Geoderma