Catalytic properties of Fe2O3/ZnAl2O4 system in alkylation reactions of chosen hydroxyarenes with methanol

• Autorzy: Grabowska H. , Miśta W. , Zawadzki M. , Wrzyszcz J.
• Języki publikacji: EN

Abstrakty

EN

The influence of iron oxide supported on zinc aluminate on catalytic activity and physicochemical properties of the samples was investigated. Zinc aluminate was prepared by coprecipitation followed by hydrothermal treatment at elevated temperatures and iron as Fe(NO3)3 was supported on ZnAl2O4 by wet impregnation method. The obtained samples were characterized by X-ray diffraction, textural measurements (SBET, Vp, pore size distribution), and temperature programmed reduction (TPR-H2). Activities and selectivities obtained in the catalytic alkylation of phenol and anisole with methanol, performed in the presence of ZnAl2O4 and 8%Fe2O3/ZnAl2O4, were studied and compared. Experimental data show that the addition of Fe2O3 into ZnAl2O4 does improve the selectivity of alkylation. As a result of phenol methylation there were obtained its ort/zo-derivatives (ortho-creso\ and 2,6-xylenol) over ZnAl2O4 and 8%Fe2O3/ZnAl2O4 with selectivities 54.9 and 61.5%, respectively. The application of anisole as raw material in studied reaction of methylation led to obtain of 2,3,5-trimethylphenol with 76.5% selectivity at 342°C K in the presence of 8%Fe2O3/ZnAl2O4.

Słowa kluczowe

EN

ZnAl2O4; hydrothermal synthesis; Fe2O3/ZnAl2O4; methylation; phenol; anisole; TPR

PL

ZnAl2O4; synteza hydrotermalna; Fe2O3/ZnAl2O4; metylowanie; fenol; anizol; TPR

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2003
• Tom: Vol. 5, nr 3
• Strony: 32--34
• Opis fizyczny: Bibliogr. 10 poz., rys., tab.

Twórcy

autor

Grabowska H.

autor

Miśta W.

autor

Zawadzki M.

autor

Wrzyszcz J.

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-959 Wroclaw 2, Poland, fax: [phone],

Bibliografia

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• (3) Wrzyszcz J., Zawadzki M., Grabowska H., Miśta W., Trawczyński J., Synthesis and properties of zinc aluminate catalyst, Polish J. Chem., 2001, 75, 899.
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• (8) Wrzyszcz L, Grabowska H., Alkylation of hydroxyarenes with alcohols in the presence of iron catalyst, Polish J. Chem. Technol., 1999, 1, 50.
• (9) Wrzyszcz J., Grabowska H., Miśta W., Syper L., Zawadzki M., A new efficient catalytic method of naphthols ring alkylation, Appl. Catal. A: Gen., 1998, 166, L249.
• (10) Grabowska H., Miśta W., Trawczyński J., Wrzyszcz J., Zawadzki, M., A method for obtaining thymol by gas phase catalytic alkylation of m-cresol over zinc aluminate spinel, Appl. Catal. A: Gen., 2001, 220, 207.