Synthesis and characterization of SBA-3, SBA-15, and SBA-1 nanostructured catalytic materials

• Published in: Journal of colloid and interface science 2007-11, Vol.315 (1), p.184-190
• Main Authors: Anunziata, Oscar A., Beltramone, Andrea R., Martínez, Maria L., Belon, Lizandra López
• Format: Article
• Language: English
• Subjects: Al-SBA-15; Catalysis; Characterization; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Porous materials; SBA-1; SBA-15; SBA-3; Surface physical chemistry; Synthesis; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2007.06.033

A highly ordered large pore mesoporous silica molecular sieve SBA-3, SBA-15, Al-SBA-15, and SBA-1, were developed and characterized by XRD, BET, FTIR, SEM, and NMR-MAS. The catalytic materials were synthesized using different raw materials and operation conditions. These materials contain a regular arrangement of uniform channels with diameters between 1.8 and 10 nm, high specific surface area and high specific pore volume. The designed methods were effective for the synthesis, presenting each mesostructured materials, patterns of XRD and other characteristics corresponding to the reported ones in literature. The new route employed to synthesize Al-SBA-15, generates a catalyst with only aluminum in tetrahedral form, according to the data of 27Al NMR-MAS. However, several reports indicated that the coordination of the Al atoms changes below the Si/Al ratio of 45, presenting peaks corresponding to penta and hexa-coordinated aluminum, which are absent in our samples (Si/Al = 50 and 33). SBA-1, SBA-3, SBA-15, and Al-SBA-15 were successfully developed by a new route. Al-SBA-15 (Si/Al, a: 50 and b: 33) posses only Al Th. The main XRD signal appears at d 100 , 1.2° (2 θ) shifts to 0.9°, for higher Al content.