II International Symposium on Carbon for Catalysis ABSTRACTS

OP-I-21
resorcinol to catalyst molar ratio (R/C) from 100 to 200, and resorcinol concentration in water
from 10 30 wt %, and curing time from 18 to 120 hours. Spherical aerogels were synthesized
using emulsion polymerization processing of resorcinol and formaldehyde in surface active
agent containing organic solutions.
The gels were dried at supercritical conditions (temperature 60 and 250 o C, pressure
12 MPa). The dried RF aerogels were carbonized in gravimetric apparatus at 400, 600 and
800 o C in argon atmosphere with heating rate 5 o C/min.
The porous structure of RF organic and carbon aerogels were determined by N 2
adsorption method at 77 K using an adsorption apparatus Quantachrome Autosorb 1-C.
Samples were evacuated at 50 o C in case of the RF organic aerogels or at 150 o C in case of the
carbon aerogels before the adsorption measurements. The Brunauer-Emmett-Teller surface
area (S BET ), micropore volume (V mic ) and mesopore volume (V mes ) of the samples were
analyzed by Brunauer-Emmett-Teller theory, t-plot theory and BJH theory, respectively.
It was stated on the base of the obtained results that potassium hydroxide can be effective
catalyst of resorcinol-formaldehyde polycondensation in water medium. The obtained RF and
their carbonization products at 600 o C are characterized by large specific surface area
(400 – 800 m 2 /g), mesopores volume (0.2 – 1.4 cm 3 /g) pore diameter in the range 2-20 nm.
Physicochemical properties of the final products depend on resorcinol concentration in water,
resorcinol to catalyst (R/C) molar ratio and method of alcogels drying. In case of spherical
carbon aerogels their porous structure and spheres diameter additionally depends on sol
viscosity, stirring speed during the emulsion polymerization processing.
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