Novel “ship-in-the-bottle” type catalyst: evidence for encapsulation of 12-tungstophosphoric acid in the supercage of synthetic faujasite

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

“…Deposition of the 12-tungstophosphoric acid dramatically increased the selectivity for disproportionation. The results were comparable to those obtained by the same group with the encapsulated polyoxometalate [27]. Very recently, Sun reported a "build-bottle-around-ship" synthesis of HPMo 12 encapsulated in Y zeolite [34].…”

“…Quite simultaneously with Mukai et al, Sulikowski et al reported the encapsulation of 12-tungstophosphoric acid (HPW 12 ) in the supercage of Y faujasite [27]. As above, the zeolite was first dealuminated (by treatment with SiCl 4 or EDTA) prior synthesis of the polyoxometalate.…”

“…Two relatively high PMo loadings (15 and 6 wt %) were obtained by varying the amount of added polyoxometalate. The solids were characterized by X-ray fluorescence, X-ray diffraction, infrared spectroscopy, nitrogen adsorption-desorption and solid-state 27 Al and 31 P MAS NMR spectroscopy. As in the above case, the polyoxometalate should not be stable in the synthesis medium, but the 31 P MAS NMR spectra provide evidence of the presence of the Keggin unit in the resulting solid, with only a sharp peak at −3.5 ppm is observed.…”

Self‐Assembled Nanoreactors

“…290 A range of reactions can be performed using shipin-a-bottle complexes, that is, oxidations, 291 hydrogenations, 292 and acid-catalyzed isomerization and disproportionation reactions. 293 Recent advances in organic crystal engineering, particularly the rational design of complex solid architectures through supramolecular preorganization, have renewed interest in topochemical reactions. [294][295][296][297][298][299] Although not many catalysis experiments have been carried out with these organic crystals, it is worth mentioning the possibility in this review.…”

Valorization of Waste Cooking Oil into Biodiesel over Heteropolyacids Immobilized on Mesoporous Silica — A Kinetic Study

“…HPAs have low specific surface areas (1-10 m 2 /g). In order to increase the specific area of HPAs or, even better, to increase the number of accessible acid sites of the HPAs, a variety of supports like activated carbon [23][24][25][26], silica [27][28][29][30][31][32], zeolite [33][34][35][36][37][38] and polymeric matrix [39][40][41][42][43] have been used as support to immobilize HPAs.…”