Aniline adsorption onto Na-AlMCM-41 and NaY zeolite as hosts materials

MARCOS B. GÓMEZ COSTA; OSCAR A. ANUNZIATA

Village Rio das Pedras, Club Med, Rio de Janeiro, Brasil

Congreso; Enpromer 2005 (2nd Mercosur Congress on Chemical Engineering and 4th Mercosur Congress on Process Systems Engineering); 2005

CNPq

In this work we study the aniline interaction with a microporous material (NaY zeolite), compared with the aniline interaction with mesoporous material of an hexagonal packet array of channels (Na-AlMCM-41). The adsorption of aniline on Na-AlMCM-41 and NaY zeolite materials synthesized by us has been characterized by thermo-infrared spectroscopy and temperature programmed desorption (TPD). The FTIR analysis of adsorbed aniline on NaY zeolite shows the characteristic bands ascribed to N-H2 bending, two C-C ring stretching at 1630-1633, 1604 and 1495 cm-1 respectively, similar to the adsorbed aniline results on Na-AlMCM-41 host. Mainly aniline molecules would be bound through weak ð interactions onto the structure of Na-AlMCM-41. In contrast, we suggest that, the organic molecules hold by unpaired electrons of N of the aniline amino group and NaY microstructure. If water is co-adsorbed two possible modes of adsorption have been identified in Na-AlMCM-41 whereas, the NaY zeolite shows an intense band at 1640 cm-1 which is characteristic of water adsorbed on the material. Aniline interaction with zeolite NaY is stronger than aniline-MCM nanomaterial. The aniline adsorption on NaY zeolite and Na-AlMCM-41 has been evaluated in order to allow the in-situ polymerization to generate a molecular wire. Polyaniline/MCM-41 composite obtained by an in-situ polymerization technique, has been characterized by Infrared spectroscopy, N2 isotherm and dc conductivity studies.