resumo
A new microporous titanosilicate AM-3 has been synthesized on alumina tubular support by seeded hydrothermal synthesis. The dynamic characterization has been carried out by permeation assays of single gases at fixed and programmed temperature, and for several transmembrane pressure drops. The mechanisms involved in the gas transport have been investigated, namely viscous. Knudsen, activated gaseous and surface diffusions. Results published for the first AM-3 membrane have been modelled as well in order to comprise all transport contributions occurring in porous media. The obtained results pointed out the existence of macro-, meso- and micro-defects. The representation of the experimental data was achieved successfully with absolute average relative deviations between 1.5% and 2.5%. (C) 2010 Elsevier B.V. All rights reserved.
palavras-chave
ZEOLITE MFI MEMBRANES; SILICALITE-1 MEMBRANE; SEPARATION CHARACTERISTICS; DIFFUSION MECHANISM; ADSORBED GASES; TRANSPORT; HYDROCARBONS; PENKVILKSITE; ADSORPTION; DEPENDENCE
categoria
Engineering
autores
Lito, PF; Zhou, CF; Santiago, AS; Rodrigues, AE; Rocha, J; Lin, Z; Silva, CM
nossos autores
Carlos Manuel Silva
Professor associado
João Rocha
Prof. Catedrático
Patrícia Ferreira Lito
Bolseiro de pós-Doutoramento
Zhi Lin
Investigador Principalagradecimentos
Patricia F. Lito, Chun F. Zhou and Ana S. Santiago wish to thank grants provided by Fundacao para a Ciencia e Tecnologia (Portugal) (SFRH/BD/25580/2005, SFRH/BPD/26690/2006 and SFRH/BPD/48258/2008). The synthesis and characterization work was supported by research projects PTDC/CTM/73643/2006 and PTDC/EQU-EQU/100476/2008 of FCT.