Titanosilicate zeolite precursors for highly efficient oxidation reactions

Abstract

Titanosilicate zeolite precursors, with open structures of zeolite units and high amounts of catalytically active Ti species, show superior catalytic performance in the oxidative reactions.

Size modulation of MIL-125 nanocrystals to promote the catalytic performance towards oxidative desulfurization

“…The efficient catalytic oxidation of bulky thiophene derivatives such as DBT and 4,6-DMDBT is crucial for the deep oxidative desulfurization (ODS) to produce ultra-low-sulfur fuels. [34][35][36][37][38][39][40][41][42][43] The size effect on the catalytic activity of MIL-125 was evaluated by oxidative desulfurization of DBT and 4,6-DMDBT. As shown in Fig.…”

Switching between classical/nonclassical crystallization pathways of TS-1 zeolite: implication on titanium distribution and catalysis

“…The absorption bands at 210 nm and 260 nm are ascribed to the tetra-coordinated Ti and hexa-coordinated Ti, respectively. 49,50 As can be seen, the amount of hexa-coordinated Ti decreases when increasing the crystallization time, and for the TS-1-TBOT-24h sample, a new absorption peak at 330 nm appears which can be ascribed to the presence of anatase-like species. The changes in Ti species provide information on the evolution of the TS-1 zeolite microstructure and suggest that in addition to Si atoms, Ti atoms also participate in the entire TS-1 zeolite crystallization process.…”

Extra-Large Pore Titanosilicate Synthesized via Reversible 3D–2D–3D Structural Transformation as Highly Active Catalyst for Cycloalkene Epoxidation

“…It is inferred that the Ge species in IWV zeolites did not affect the UV–visible absorption. On the other hand, Ti-IWV-PS- x ( x ≠ ∞) displayed the main absorption band at 210 nm and the minor absorption band at around 270 nm, corresponding to tetra- and hexa-coordinated Ti species, respectively (Figure A,d–h), , and there was no band at about 330 nm, corresponding to the anatase species. Moreover, the intensity of 210 nm bands of Ti-IWV-PS- x increased with the decrease of Si/Ti ratio as shown in Figure A.…”