New acid catalyst comprising heteropoly acid on a mesoporous molecular sieve MCM-41

Electrochemical study of H3PMo12 retention on Vulcan carbon grafted with NH2 and OH groups

“…The dispersion of heteropolyacids in solid matrices is another method of increasing the surface area and adjusting the porosity, both of which are important in potential solidstate applications. Molecular oxides have been incorporated in different solid matrices, such as zirconia [18], silica [19], alumina [20], TiO 2 [21], and zeolites [3], exhibiting desorption problems due to weak bonding with the matrix. POM particles have also been deposited on electrode surfaces and immobilized into or within conducting polymers to modify their properties [11,[22][23][24][25][26].…”

Efficient catalytic synthesis of 2-imidazolines and bis-imidazolines with silica supported tungstosilicic acid

“…This can be achieved by dispersing the HPAs on solid supports with a high surface area. 10,11 As the sizes of HPA molecules are extremely larger than other typical acidic species, it is assumed that they are much easier to immobilize. Some of the goals of using supported HPAs are the surface area enhancement, higher dispersion of acidic protons, heterogenization and acid strength control.…”

Silica Supported Tungstosilicic Acid as an Efficient and Reusable Catalyst for the One-Pot Synthesis of β-Acetamido Ketones via a Four-Component Condensation Reaction

“…This can be achieved by dispersing the HPAs on solid supports with high surface area. [13][14][15] These supported catalysts have been widely studied and found useful in many reactions such as the synthesis of 2,4-dihydropyrimidones, 16 metanethole, 17 α-aminonitriles 18 and esterification. 19,20 The β-acetamido carbonyl compounds, in that their skeletons exist in a number of valuable biologically or pharmacologically active compounds, 21,22 has gained considerable attention in organic synthesis, owing to their importance as versatile intermediates for preparation of β-amino acids, 23 or 1,3-amino alcohols 24 as well as for the synthesis of various antibiotics such as nikkomycins or neopolyoxines 25 and potent molecules in α-glucosidase inhibitory activity.…”