New superacid ZrO2–SiO2–Al2O3 oxide and its activity in the oligomerization of tetrahydrofuran

TitleNew superacid ZrO2–SiO2–Al2O3 oxide and its activity in the oligomerization of tetrahydrofuran
Publication TypeJournal Article
Year of Publication2015
AuthorsInshina, EI, Telbiz, GM, Brei, VV
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
DOI10.15407/dopovidi2015.10.049
Issue10
SectionChemistry
Pagination49-54
Date Published10/2015
LanguageUkrainian
Abstract
Strong acidic mixed $\rm ZrO_{2}{-}SiO_{2}{-}Al_{2}O_{3}$ oxide has been synthesized by the sol-gel method. It was found that superacid ($H_{0}=-14,52$) sites are formed at the following ion content: $\rm 12\le Zr^{4+}\le 39$,  $\rm 48\le Si^{4+}\le 72$, $\rm 3\le Al^{3+}\le 31$%(at.). According to the IR spectra of adsorbed pyridine and deuterated acetonitrile, the $L$- and $B$-sites are on the surface of $\rm ZrO_{2}{-}SiO_{2}{-}Al_{2}O_{3}$. The generation of superacidity in the $\rm ZrO_{2}{-}SiO_{2}{-}Al_{2}O_{3}$ matrix could be explained by the formation of coordination-unsaturated $\rm Zr^{4+}$ ions as strong Lewis acid sites. It was shown that $\rm ZrO_{2}{-}SiO_{2}{-}Al_{2}O_{3}$ efficiently catalyzes the oligomerization of tetrahydrofuran in the presence of acetic anhydride with 68% yield of polytetramethyleneoxide acetate ($M_{n} = 510$) at 40 ºC.
Keywordsmixed oxides, polymerization of tetrahydrofuran, solid superacid, zirconia
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