Preyssler Heteropolyacid Supported on Nano-SiO₂: A Green and Reusable Catalyst in Selective Oxidation of Benzyl Alcohols to Benzaldehydes

Abstract

An efficient, improved, and environmentally benign procedure for catalytic oxidation of benzyl alcohols to the corresponding benzaldehdes was developed in the presence of nano-SiO 2 -supported Preyssler heteropolyacid (HPA), both in thermal conditions and under microwave irradiation. Silica nanostructures were obtained through a sol-gel method and were characterized by transmission electron microscopy and powder x-ray diffraction. Nano-SiO 2 -supported Preyssler HPA was synthesized by an impregnation method and confirmed by infrared spectroscopy. In catalytic reactions, the effects of various parameters such as catalyst loading, catalyst amount, temperature, and reaction time were studied and the optimum conditions were obtained.

Detection of Oxygen Species Generated in the Presence of CNT by Loading ZnS

“…Figure 1 shows that strong Ka peak of the element O appears at 0.52 keV. [12] EDX indicated O, C, Zn, and S as the major elements in the composites. Table 1 lists the numerical results of EDX quantitative microanalysis of the samples.…”

An Efficient One-pot Three-component Synthesis of Pyrido[2,3-d]pyrimidine Derivatives in the Presence of Nano Silica-supported Preyssler H14[NaP5W30O110]/SiO2 as a Green and Reusable Catalyst

“…Then, tetraethoxysilane was added into this microemulsion phase. The reaction mixture was stirred for di erent times (8,12,18,25, and 30 h) at ambient temperature. Next, the obtained dispersed Preyssler acid/SiO 2 nano structures were centrifuged (15,000 rpm) and the nano particles were dipped in acetone, ltered and dried in a vacuum oven at 80 C. …”

“…Among the solid heteropolyacids, Preyssler with 14 acidic protons and unique hydrolytic stability is an e cient and e ective supper acid catalyst for organic reactions [16][17][18]. Also, immobilization of Preyssler on the appropriate nano-SiO 2 support can develop its catalytic properties by enhancing the speci c surface area of the catalyst [16].…”