Immobilization of 12-molybdophosphoric and 12-tungstophosphoric acids on metal-substituted hexagonal mesoporous silica

In Situ Synthesis, Characterization of SiPMo‐X, and Different Catalytic Properties of SiPMo‐X and SiPW‐X

“…[14] It has been widely reported that pure mesoporous silica of SBA-15 shows the framework bands at about 800 cm -1 (symmetric stretching of Si-O-Si), 960 cm -1…”

“…The unique catalytic sites can catalyze many reactions, but zeolites also have some restrictions in general applications, such as weaker acidity, lack of variability in pore size, and the limited number of the constituent elements. [2][3][4][5][6][7][8][9][10][11][12] For heteropoly compounds, peculiarly for HPAs, because their unique acidic and redox properties can be controlled at the atomic/molecular level, their catalytic function in the solid state as well as in solution has attracted much attention: the strong acidity or oxidizing properties of heteropoly compounds, the soft basicity of the polyanions, the high solubility in water and organic solvents, a moderately high thermal stability in the solid state, the relatively simple synthetic procedure, the ability to form pseudoliquid phases, and the possibility of the introduction of several different elements into polyanions and counter-cations. All the above-mentioned advantages of HPAs have led to a large body of work on their applications in homogeneous and heterogeneous catalysis.…”

“…All the above-mentioned advantages of HPAs have led to a large body of work on their applications in homogeneous and heterogeneous catalysis. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Soluble heteropoly compound catalysts (HPAs are typically strong Brønsted acids and are very soluble in oxygen-containing polar solvents such as water, alcohols, ethers, and ketones.) can catalyze a large variety of reaction types but suffer from their inability to be recycled.…”

Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

“…HPAs, have been immobilized on solid supports, such as amorphous silica, hexagonal silica or MCM-41 [13][14][15][16][17][18].Although there are many types of supports, the common silica type is often employed, due to its availability and chemical stability.…”

“…In this paper, in continuation of our interests and experiences on HPAs [23] and cited references therein [23] for extending the applications of Dawson HPA, a novel nanocomposite based on propylamine-functionalized nanosilica and Dawson polyoxometalate, H 6 [P 2 W 18 O 62 ], have been prepared in different loadings and their capability examined for photocatalytic degradation of MG.…”