Single crystals mesoporous oxides

Tin incorporated mesoporous Sn-MFI catalysts with different Si/Sn ratio using microwave were synthesized with carbon as hard template. These tin MFI catalysts were characterized using various physicochemical techniques XRD reviled the formation of more crystalline MFI structures which was further supported by the SEM and TEM imaging which clearly showed well ordered zeolite single crystals with mesoporosity. The N2 sorption isothers reviled the formation of bimodal mesoporous zeolites and the presence of tin in tetrahedral site was confirmed by FTIR (970 cm 1) and XPS (3ds/2 and 3 dj 2 electronic states). The thus synthesized mesoporous Sn-MFI catalysts with different Si/Sn ratios were used in studying the catalytic Baeyer-Villiger Oxidation (BVO) of cyclic ketones... 

Mesoporous structure was constructed in single crystal particles of niobium and tantalum mixed oxide. TEM and electron diffraction indicated single crystal phase with the mean pore size of 10 nm. The crystallized mesoporous material showed mechanical and hydrothermal stability. 

Two recent variations of this methodology are the synthesis of single crystals of mesoporous niobium and tantalum oxides and the rapid preparation of titanium dioxide solids using sonochemistry. ... 

Lee. B. Yamashita. T. Lu, D. Kondo, J.N. Doraen. K. Single-crystal particles of mesoporous niobium-tantalum mixed oxide. Chem. Mater. 2002. 14, 867. 

The goal of this chapter is to gather the methods most commonly used for the preparation of gold catalysts supported on common oxide powders. For the sake of brevity, deposition on more specific supports, such as structured mesoporous supports, zeolites, and carbon is barely reported in this chapter, and we refer to Chapter 4 of the book on gold catalysis [7]. The methods described are mainly those performed in the liquid phase. The preparations of model catalysts, that is, on films or single crystals and those of bimetallics are excluded. 

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