Sol-gel synthesis of ternary phosphate-ZrO2-SiO2 catalysts for alcohol dehydration
Abstract
Phosphate–ZrO 2 –Si 2 O catalysts were synthesized by sol-gel method using tributyl phosphite, zirconium propoxide, and tetraethyl orthosilicate as precursors. They were characterized by N 2 adsorption, 31 P CP MAS NMR, and DRIFTS. At lower P content, monomeric phosphates were formed on the surface of the catalysts, which were mainly responsible for the isopropanol dehydration activity. At higher P content, polyphosphates were formed, and thus, the dehydration activity decreased. An optimum P content for dehydration activity was found to be at 10 mol%.Key words: sol-gel synthesis, ternary oxides, phosphate, acid catalyst, alcohol dehydration, 31 P CP MAS NMR, N 2 adsorption, DRIFTS.
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