Ethanol Dehydration Pathways on NASICON-Type A0.33M2(PO4)3 (A=Dy,Y,Yb M=Ti,Zr) Catalysts: The Role of Hydroxyl Group Proton Mobility in Selectivity Controlстатья
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Аннотация:NASICON-type titanium and zirconium phosphates doped with rare-earth cations, A0.33M2(PO4)3 (M = Ti, Zr; A = Dy, Y, Yb), were synthesized using the sol–gel method and investigated as catalysts for ethanol dehydration at 300–400 ◦C. The catalysts were characterized via XRD, SEM, BET, and FTIR spectroscopy. The relationships between the catalyst composition, acidity and the dehydration activity were evaluated. Diethyl ether (DEE) formation is promoted by the presence of the zirconium phosphates (ZrP),while the presence of titanium phosphate (TiP) catalyzes the formation of both ethyleneand diethyl ether (DEE). The application of Fourier-transform infrared (FTIR) spectroscopyto the analysis of adsorbed C6H6 has revealed the presence of hydroxyl groups exhibitingvarying degrees of proton-donating mobility. This finding has enabled the correlationof the structure of the active sites with the process’s selectivity. The results underscorethe key function of OH-group localization and framework geometry in the control ofform-selective reactions
