Cesium salts of tungsten-substituted molybdophosphoric acid immobilized onto platelet mesoporous silica: Efficient catalysts for oxidative desulfurization of dibenzothiophene

Transesterification of waste cooking palm oil and palm oil to fatty acid methyl ester using cesium-modified silica catalyst

“…%) with further increase in catalyst loading. This close difference in maximum catalyst loading resulting in WCPO and PO transesterification might be due to the solubility of methanol in palm oil more than waste oil because of the presence of some impurity in waste oils, and for constant amount of WCPO more catalyst amount is needed to produce the same yield of biodiesel, which is in good agreement with previous studies [30][31][32][33]. The stability of catalyst structure against the emulsification by the co-produced methanol could be expected, the XRD analysis results showed the Cs25-SiO 2 catalyst possesses highly crystalline cohered structure; results of the FTIR analysis also indicated the same molecular banding of the reused and fresh catalyst (Figs.…”

Catalytic Desulfurization of Benzothiophene Using Keggin Type Polyoxometalates as catalyst

“…Xu et.al (2014) reported ultra-deep desulfurization was achieved using peroxophosphomolybdate catalysts with regeneration of catalyts [6]. A similar phenomenon was conducted by Chamack et.al (2014), they used tungsten-substituted molybdophosphoric acid as efficient catalyst for desulfurization [7]. On the other hand, mesoporous silica such as MCM-41, MCM-48, and SBA-15 was applied as catalyst for desulfurization of dibenzothiophene and 4,6-dimethyl dibenzothiophene using t-butyl hydroperoxide as oxidant [8].…”

Catalytic Performance of Ammonium Salt of Molybdenum Heteropoly Acid Supported Silica for Oxidative Desulfurization of Benzothiophene, Dibenzothiophene and 4,6-Dimethyldibenzothiophene in Model Oil

“…Li et al [30] reported mesoporous silica pillared clay incorporated with phosphotungstic acid. Chamack et al [31] reported a series of cesium salts of tungsten substituted molybdo-phosphoric acid, CsxH3-x [PMo12-yWyO40], (x = 1-3, y = 2-1) supported on platelet SBA-15). Wu et al [32] ) were incorporated into the mesoporous silica pillared clays (MSPC) which shows excellent performance in ODS.…”