This study comparatively investigates the catalytic activities and degradation kinetics of produced biodiesels using kaolinite-based heterogeneous catalysts to examine stability. The performance was tested under same operating parameter (methanol/oil ratio, 5:1, at 200 °C for 6 h). obtained biodiesel analyzed TGA equipment obtain yield, as well kinetic parameters. It observed that solid superac...

The use of Cs0.5H0.5PW12O40 insoluble salt as a superacid promoter in the catalyst layer of a polymer electrolyte membrane fuel cell (PEMFC) has been investigated. An increase of performance has been recorded at intermediate temperatures (110–130 °C) and under low relative humidity (R.H.). The promoter appears to mitigate the ionomer dry-out effects in the catalytic layer and produces an increa...

The synthesis of salts of the type R„SH3_„+MF6~ (R = C2H5, i-C3H7; n = 1, 2; M = As, Sb) by protonation of the corresponding thiols and sulfides in the superacid systems HF/MF5 is reported. The salts have been characterized by vibrational and NMR spectroscopic methods. Isopropylsulfonium hexafluoroantimonate is the first known example of a sulfonium salt, for which a SH bond distance has been d...

Over the past two decades, polyoxometalates (POM) have received considerable attention as solid catalysts, due to their unique physicochemical characteristics, since, first, they very strong Bronsted acidity, approaching region of a superacid, and second, are efficient oxidizers that exhibit rapid redox transformations under fairly mild conditions. Their structural mobility is also highlighted,...

A direct band gap nature in semiconducting materials makes them useful for optical devices due to the strong absorption of photons and their luminescence properties. Monolayer transition metal dichalcogenides (TMDCs) have received significant attention as semiconductors a platform applications physics. However, bilayer or thicker layered samples exhibit an indirect gap. Here, we propose method ...

SO42-/ZnO-TiO2 catalyst was prepared by sulfating ZnO-TiO2 powders with H2SO4 solution. The catalyst was characterized by XRD, IR and Hammett indicator. The catalyst showed strong acidity(H0 ≦-16.0). The optimum conditions are found that the calcination temperature is 823K and the so...

Subnanometer-scale silicon dioxide (SiO2) films are frequently present before, during, and after device processing, yet they offer minimal surface passivation can detrimentally impact subsequent processing steps. Here we develop a process whereby the of nanometer subnanometer SiO2 is enhanced by up to 2 orders magnitude simple room temperature treatment using superacid bis(trifluoromethane)sulf...