Preparation of periodic mesoporous silica-included divacant Keggin units for the catalytic oxidation of styrene to synthesize styrene oxide

Preparation of MCM-41 incorporated with lacunary Keggin polyoxometalate and its catalytic performance in esterification

“…3b-e), which is due to that the peak is overlapped by the broad and intense peak of SiAOAH (965 cm À1 ) coming from MCM-41 support. But it can be observed that the peak of the WAO b (886 cm À1 ) shifts to a higher wave number for the LPOM-DS samples, indicating the strong interaction between the Keggin units and the silica matrix [26]. In addition, the peaks at 1483 and 1384 cm À1 can also not be observed in the FT-IR spectra of the LPOM-DS and LPOM-IM samples (Fig.…”

Progress of the Application of Mesoporous Silica-Supported Heteropolyacids in Heterogeneous Catalysis and Preparation of Nanostructured Metal Oxides

“…HPA in silica matrix exhibits resistance to leaching, even after hot water extraction at 373 K. It was observed that the incorporation of the HPAs molecules lead to the decrease of the pore size and surface area. They have been proved to be efficient heterogeneous catalysts for dehydration [73,74,75,76,77,78,79,80] and oxidation reactions [81,82,83]. …”

“…Guo et al [ 82 ] reported the catalytic oxidation of styrene with H 2 O 2 by the SBA-15 incorporated divacant Keggin [( n -C 4 H 9 ) 4 N] 4 [ γ -SiW 10 O 34 (H 2 O) 2 ] ( Scheme 23 ). The activity of the catalyst for the catalytic oxidation of styrene is solvent dependent.…”

Flexible oxidation of styrene using TBHP over zirconia supported mono-copper substituted phosphotungstate

“…24 In the same year, Guo -15], and used for epoxidation of styrene. 25 In 2009, various transition metal substituted polyoxotungstates, K 10Àn X n+ MW 11 O 39 (X ¼ P/Si, M ¼ Co/Ni/Cu/Mn), were supported on Schiff base modied SBA-15 by Guo et al These were further used for selective oxidation of styrene to benzaldehyde. 26 3À ] and used them as sustainable and reusable catalysts for selective epoxidation of styrene.…”