Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide | ||||
| Egyptian Journal of Chemistry | ||||
| Article 10, Volume 60, Issue 2, April 2017, Page 329-345 PDF (1.23 MB) | ||||
| DOI: 10.21608/ejchem.2017.3288 | ||||
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| Abstract | ||||
| SULFATED zirconia (SZ) and zinc supported sulfated ……zirconia (Zn/SZ) catalysts were synthesized, characterized and evaluated by coumarin synthesis reaction. The reaction was carried by reacting resorcinol and ethyl acetoacetate with a molar ratio 1:2 respectively. The investigated SZ and Zn/SZ catalysts were prepared by the simple impregnation method with an aqueous solution of H2SO4 as a precipitating agent, followed by drying in rotary and finally calcined at 600 oC for 3 hrs. The physicochemical properties of the investigated catalysts were characterized by the x-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and potentiometric titration to characterize the number and the strength of the acid sites. The 6%Zn/SZ catalyst possessed the maximum catalytic activity as well the number of acid sites. Increase of the tetragonal phase content in ZrO2 increases the catalytic activity. | ||||
| Keywords | ||||
| Sulfated zirconia; Impregnation method; coumarine synthesis reaction and potentiometric titration | ||||
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