Building MOF bottles around phosphotungstic acid ships: One-pot synthesis of bi-functional polyoxometalate-MIL-101 catalysts

Phosphotungstic Acid Encapsulated in Metal–Organic Framework as Catalysts for Carbohydrate Dehydration to 5‐Hydroxymethylfurfural

“…[17] Kapteijn et al found indications for the partial exchange of W for Cr in the polyoxometalate clusters during PTA/MOF synthesis following the observation of the splitting of the band at 1080 cm À1 and the shift of the band at 982 cm À1 to 963 cm À1 . [15] However, these changes did not occur in this case, which indicates that the primary polyoxometalate structure remains intact upon inclusion in the MOF in our preparation. Figure 4 shows the 31 P MAS NMR spectra of the materials.…”

“…A mixture of Cr(NO 3 ) 3 ·9 H 2 O (10 mmol), 1,4-benzenedicarboxylic acid (10 mmol), hydrofluoric acid (10 mmol), and phosphotungstic acid (0.5-3 g) in water (48 mL) was adjusted to pH 1 by saturated NaOH solution and then heated at 220 8C for 8 h. [14,15] To probe the presence of polyanions within the pores and the structure of materials, the PTA(x)/MIL-101 materials (x = amount of PTA added in grams) were analyzed by N 2 sorption measurements, X-ray diffraction, 31 P MAS NMR spectroscopy, scanning electronic microscopy, and infrared spectroscopy. Figure 1 shows the XRD patterns of the synthesized materials.…”

“…This material exhibits good catalytic performance for acid-catalyzed reactions such as the esterification of n-butanol with acetic acid in the liquid phase. [15] Herein we investigate the possibility to use metal-organic frameworks for the valorization of biomass. Specifically, we intend to use the acid functionality of phosphotungstic acid (PTA) encapsulated in MIL-101 for the dehydration of carbohydrates.…”

The coordinatively saturated vanadium MIL-47 as a low leaching heterogeneous catalyst in the oxidation of cyclohexene

“…Moreover, unlike traditional immobilized catalysts 9,10,11 , the active catalytic sites in MOFs are well protected by the coordination bonds which prevents leaching to a higher extent. Although the research in this field is relatively new, MOFs have been studied as catalysts in hydrogenation and oxidation reactions 12,13,14,15,16,17,18 enantioselective reactions 19,20,21 , photocatalysis 22 , carbonyl cyanosilylation 23,24,25 , hydrodesulfurization 26 and esterification 27 .…”

Determination of heat capacities and thermodynamic properties of two structurally unrelated but isotypic calcium and manganese(II) 2,6-naphthalene dicarboxylate-based MOFs

“…Metal-organic frameworks (MOFs) are molecular architectures comprising metal ion nodes bridged by organic ligands, which have attracted much interest recently due to their potential interest for gas storage [1][2][3][4][5], gas separation [6][7][8][9][10], as catalytic active phases [11][12][13][14][15], and as luminescent materials [16][17][18]. Among the numerous synthetic routes leading to MOF materials, most of them involve the use of metal carboxylates as organic ligands that readily interact with various metal ions through their negatively charged ends.…”