ZENG Xiang, YUAN Xia, WU Jian, et al. Preparation, characterization and catalytic behavior of phosphotungstic acid encapsulated in Y zeolite[J]. CIESC Journal, 2010, (6): 1463-1468.
ZENG Xiang, YUAN Xia, WU Jian, et al. Preparation, characterization and catalytic behavior of phosphotungstic acid encapsulated in Y zeolite[J]. CIESC Journal, 2010, (6): 1463-1468.DOI:
Phosphotungstic acid encapsulated in ultra stable Y zeolite (PW-USY) was prepared by the “ship in the bottle” synthesis.The obtained catalysts were characterized with FT-IR
ICP
UV-vis
N2-adsorption
XRD and SEM techniques.Compared with immobilized catalysts (PW/USY)
it was demonstrated that encapsulation of Keggin-type 12-phosphotungstic acid in the supercage of USY zeolite was realized.In the ammoximation of cyclohexanone system with H2O2 as oxygen source
PW-USY showed better catalytic activity than PW/USY.Moreover
the catalytic performance of PW-USY did not drop apparently after using five times
and could solve the leakage problem of active component in polar reaction media better than immobilized catalysts (PW/USY).