Assembly of heteropoly acid nanoparticles in SBA-15 and its performance as an acid catalyst.
Keggin-type 12-tungstophosphoric acid (TPA) nanocrystals have been assembled inside the pores of mesoporous silica through a vacuum impregnation method by using large-pore SBA-15 as a nanoreactor. The product was characterized by Brunauer-Emmet-Teller particle size distribution (BET-PSD), NMR and FT-IR spectroscopy, X-ray diffraction (XRD), tranmsission electron microscopy (TEM), differential thermal analysis (DTA) and FT-IR of adsorbed pyridine. The experimental results illustrate that the TPA nanocrystals are excellent Brønsted acid catalytic materials at room temperature.
Yu
Shu-Yuan
SY
Department of Chemistry, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China.
Wang
Li-Ping
LP
Chen
Bo
B
Gu
Ying-Ying
YY
Li
Jing
J
Ding
Han-Ming
HM
Shan
Yong-Kui
YK