title: Assembly of heteropoly acid nanoparticles in SBA-15 and its performance as an acid catalyst.
abstract: 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.
authors.affiliation: Department of Chemistry, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China.
authors.forename: Shu-Yuan
authors.initials: SY
authors.lastname: Yu
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Gu
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Han-Ming
authors.initials: HM
authors.lastname: Ding
authors.forename: Yong-Kui
authors.initials: YK
authors.lastname: Shan