A series of sulph ated zirconia sample s (S Z) pro moted with Al2O 3 ,Ga2O 3, and Fe 2O 3 were synth esized by co-prec ipitation at constan t pH and aged un der re flux conditions . Stru ctural, surface and cataly tic properti es of the samp les were inves tiga ted usin g N2 adsorptio n/desorpt ion, therm al ana lysis, in-situ FTIR spectrosc opy, TPR –MS and EGA–M S m easur ements . The cataly tic perf orma nce of pro moted SZ in anisole acylatio n has bee n inves tiga ted. Pro motion by either Fe 2O 3 or Ga 2O 3 wa s found to increa se the cataly tic act ivity (yield) after recyc le of cataly sts with respec t un -promot ed sample , wherea s prom otion by Al 2O 3 wa s observ ed to increa se the conv ersion but not the yield. It is wor th noting that all systems present high selecti vity to the p -me toxyace toph enone product.
Study on reuse of metal oxide-promoted sulphated zirconia in acylation reactions
SIGNORETTO, Michela;PINNA, Francesco;
2008-01-01
Abstract
A series of sulph ated zirconia sample s (S Z) pro moted with Al2O 3 ,Ga2O 3, and Fe 2O 3 were synth esized by co-prec ipitation at constan t pH and aged un der re flux conditions . Stru ctural, surface and cataly tic properti es of the samp les were inves tiga ted usin g N2 adsorptio n/desorpt ion, therm al ana lysis, in-situ FTIR spectrosc opy, TPR –MS and EGA–M S m easur ements . The cataly tic perf orma nce of pro moted SZ in anisole acylatio n has bee n inves tiga ted. Pro motion by either Fe 2O 3 or Ga 2O 3 wa s found to increa se the cataly tic act ivity (yield) after recyc le of cataly sts with respec t un -promot ed sample , wherea s prom otion by Al 2O 3 wa s observ ed to increa se the conv ersion but not the yield. It is wor th noting that all systems present high selecti vity to the p -me toxyace toph enone product.File | Dimensione | Formato | |
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