Incorporation of Keggin-based H₃PW₇Mo₅O₄₀into bentonite: synthesis, characterization and catalytic applications

Abstract

A green and efficient protocol of PW7Mo5/bentonite is use as an efficient and recyclable catalyst for different heterocyclic multicomponent reactions.

Recyclable Clay-Supported Heteropolyacid Catalysts for Complete Glycolysis and Aminolysis of Post-consumer PET Beverage Bottles

“…We have clearly seen that with respect to catalytic activity towards depolymerization of post-consumer PET wastes using bentonite impregnated with Zn 2+ and Al 3+ performed excellently while comparing kaolin-supported analogues (Jeya et 3c is the EDX spectrum of PMA loaded bentonite. The percentage of mass of Mo 6+ was found to be 1.06±0.03%, while compared to the kaolin support, bentonite was found to be the best catalytic support with a higher metal ion loading capacity (Aher et al, 2021b). Comprehensively, the mass and atomic % values signify that amount of PWA and PMA loading on bentonite support is higher compared to PWA and PMA supported kaolin catalysts.…”

“…The SEM-EDX analysis con rmed the presence of W 6+ and the composition of PWAbentonite showed 14.74±0.12 wt% of W 6+ in bentonite clay. It strongly indicates the successful impregnation of PWA in bentonite catalysts(Aher et al, 2021b). EDX analysis also revealed the presence of other elements present in bentonite clay, namely, Na + in 2.01±0.03, Mg 2+ in 1.13±0.02, Al 3+ in 8.56±0.05, Si 4+ in 19.12±0.07, Ca 2+ in 1.60±0.03 and Fe 2+/3+ in 4.90±0.08%(Siredar et al, 2018).…”

“…Similarly, the SEM images of pure bentonite and Al 3+ impregnated bentonite (supplementary information, Figure S7) and Zn 2+ , PWA, PMA, and Al 3+ loaded bentonite are clearly shown in Figure 3d -f, respectively. The SEM images showed the morphology of bentonite clearly consist of stacked layered structure (Winiarsk et al, 2018;Aher et al, 2021b). Due to the layered structure, the SEM imaging showed the effects of impregnation on clay supports.…”

Water compatible silica supported iron trifluoroacetate and trichloroacetate: as prominent and recyclable Lewis acid catalysts for solvent-free green synthesis of hexahydroquinoline-3-carboxamides

“…Acid catalysts have created new horizons and milestones in the field of synthetic chemistry in recent decades. 1–3 These catalysts are at the heart of many crucial industrial processes including biomass conversion, 4 biodiesel production, 5 polymer synthesis 6 and different organic transformations, 7 because of their great ability to accelerate reaction rates at low cost, excellent conversion, and product selectivity. Among all these acid catalysts, Lewis acids are considered as one of the supreme pillars and the most significant area of catalysts for organic synthesis.…”

Cesium salt of 2-molybdo-10-tungstophosphoric acid as an efficient and reusable catalyst for the synthesis of uracil derivatives via a green route

“…In our previous work, we reported some modied heteropolyacids by combining metals like Mo, V, and W with different ratios, which were used in some organic transformations showing good results. [44][45][46][47][48][49][50] So here we studied a different ratio of Mo and W (2 Mo : 10 W) and prepared our new catalyst. The whole synthesis for this catalyst i.e., Cs 2.3 H 0.7 PW 10 Mo 2 O 40 , was too simple and cheap than several others, which were used for the same organic transformation.…”