Resumo (PT):
Abstract (EN):
Carbon molecular sieve membranes (CMSM) were prepared on α-alumina supports by carbonization of a
resorcinol–formaldehyde resin loaded with boehmite. Two series of carbon membranes produced at
500 1C and 550 1C carbonization end temperatures were prepared. The influence of the carbonization
end temperature on the structure, morphology and performance of the membranes was examined by
scanning electron microscopy, thermogravimetric analysis, CO2 adsorption and permeation to N2, O2, He,
H2 and CO2 at temperatures from 25 1C to 120 1C. SEM photographs showed carbon membranes with a
thin and very uniform layer and a thickness of ca. 3 mm. Carbon dioxide adsorption isotherms revealed
that all the produced carbon membranes have a well-developed microporous structure. Nevertheless, the
membranes carbonized at 550 1C have more ultramicropores and a narrower pore size distribution.
The permselectivity of CMSM prepared at this temperature surpasses the Robeson upper bound for
polymeric membranes, especially regarding ideal selectivities of pairs O2/N2 (O2 permeation rate: 9.85
1010 mol m2 s1 Pa1 and ideal selectivity: 411.5), H2/N2 (H2 permeation rate: 5.04
108 mol m2 s1 Pa1 and ideal selectivity: 4586) and He/N2 (He permeation rate: 4.68
108 mol m2 s1 Pa1 and ideal selectivity: 4544).
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Notas:
Publicação abrangida pelo Journal Citation Reports 2015
Nº de páginas:
10