US EPA

1452983 

Journal Article 

Synthesis, characterization and catalytic application of mesoporous molecular sieves SBA-15 functionalized with phosphoric acid 

Wu, B; Tong, Z; Yuan, X 

2012 

Yes 

Journal of Porous Materials
ISSN: 1380-2224 

19 

5 

641-647 

10.1007/s10934-011-9515-4 

WOS:000308969000015 

The phosphoric acid groups has been successfully grafted on
the surface of mesoporous molecular sieve SBA-15 to form a solid acid catalyst P-SBA-15 by post-
synthesis method. The samples were characterized by means of XRD, FT-IR, SEM, TEM, P-31 MAS NMR,
NH3-TPD, N-2 adsorption/desorption and the esterification reaction. The XRD and N-2
adsorption/desorption results indicate that P-SBA-15 catalyst keeps the 2D hexagonal mesoporous
structure and opens channels with the lower surface area of 554.35 m(2)/g compared with that of
SBA-15. The SEM and TEM results show that the figuration of P-SBA-15 behaves ""rod-like"" and
phosphoric acid groups is scattered differently on the surface of P-SBA-15. The FT-IR and P-31
MAS NMR results display that phosphorus species graft onto the surface of SBA-15, which provide
the Bronsted acid sites on the surface of P-SBA-15. The acidity of the generated Bronsted acid
sites on P-SBA-15 significantly is verified by NH3-TPD. The esterification reaction results shows
that catalytic activity of P-SBA-15 is enhanced significantly compared with that of SBA-15, and
its stability is good. 

Mesoporous molecular sieve; SBA-15; Phosphoric acid groups; Esterification