Sepctroscopic evidence of SBA-15 mesoporous solids functionalization.

V. Herledan-Semmer (1) , S. Dakhlaoui (1) , F. Guenneau (1) , E. Haddad (1) , A. Gedeon (1)

1 SIEN - Systèmes interfaciaux à l'echelle nanometrique

In order to enhance the acid properties of mesoporous materials, the functionalization of the SBA-15 silica surface with arene-sulfonic acid groups has been adopted via a one-step synthesis procedure. The structures of the sulfonic acid surface-functionalized mesoporous silica were studied and identified by using nitrogen adsorption, X-ray diffraction (XRD), FT-IR, TEM, CP/MAS 29Si and 13C NMR, and hyperpolarized 129Xe NMR techniques. The no. of acid groups was detd. by ammonia adsorption and catalytic properties were also studied in liq. phase. The structure of the obtained materials showed hexagonal mesoscopic order, possessed large surface areas with a heterogeneous distribution of sulfonic functions within the pore of the mesoporous solid. The anchoring of acid groups has been proved by 29Si, 13C CP-MAS-NMR measurements and using the recent technique of hyperpolarized 129Xe NMR. The no. of acid groups is directly proportional to the functionalization ratio. Moreover, these acidified solids display interesting catalytic properties for the esterification of acetic acid with ethanol.

Domaines: Catalyse

V. Herledan-Semmer, S. Dakhlaoui, F. Guenneau, E. Haddad, A. Gedeon. Sepctroscopic evidence of SBA-15 mesoporous solids functionalization.. Studies in Surface Science and Catalysis, 2004, 154B, pp.1519-1524. ⟨hal-00161986⟩