Chemical and Biochemical Engineering Quarterly, ( ISI ), Volume (26), No (2), Year (2012-5) , Pages (71-77)

Title : ( Preparation of Nano-Size Al-Promoted Sulfated Zirconia and the Impact of Calcination Temperature on Its Catalytic Activity )

Authors: behgam rahmani vahid , Nasser Saghatoleslami , حامد نایب زاده , A. Maskooki ,

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Solvent-free technique was employed in this work in order to assess the influence of the calcination temperature on the activity of Al-promoted sulfated zirconia. The catalyst was analyzed by XRD and IR-spectrum method, and catalytic activity was examined by esterification reaction of oleic acid. XRD analysis revealed that a decline in the percentage of tetragonal phases of zirconia was observed by increasing the calcination temperature from 500 to 900 °C. In addition, a reduction of sulfate groups as SO4 (2–) on zirconia surface was observed. As a consequence, a decline in Brønsted sites with calcination temperature enhancement also prevailed. Therefore, the size of Al-promoted sulfated zirconia particles was increased accordingly. On the other hand, with the aluminum sulfate loading, the amount of sulfate ions on Al-promoted sulfated zirconia surface was enhanced and a reduction in particle size of Al2O3/S-ZrO2 was also observed, as compared to non-promoted. The result of this study revealed that an increase of sulfate and alumina groups causes a raise in the acidity of catalyst. Furthermore, the calcined Al-promoted and non-promoted sulfated zirconia would convert 96.10 % and 89.36 % of oleic acid to biodiesel, respectively. Therefore, Al2O3/S-ZrO2 as a catalyst exhibits a higher activity than S-ZrO2.

Keywords

, Sulfated zirconia, alumina, solvent-free, calcination,
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@article{paperid:1029547,
author = {Rahmani Vahid, Behgam and Saghatoleslami, Nasser and حامد نایب زاده and A. Maskooki},
title = {Preparation of Nano-Size Al-Promoted Sulfated Zirconia and the Impact of Calcination Temperature on Its Catalytic Activity},
journal = {Chemical and Biochemical Engineering Quarterly},
year = {2012},
volume = {26},
number = {2},
month = {May},
issn = {0352-9568},
pages = {71--77},
numpages = {6},
keywords = {Sulfated zirconia; alumina; solvent-free; calcination; esterification},
}

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%0 Journal Article
%T Preparation of Nano-Size Al-Promoted Sulfated Zirconia and the Impact of Calcination Temperature on Its Catalytic Activity
%A Rahmani Vahid, Behgam
%A Saghatoleslami, Nasser
%A حامد نایب زاده
%A A. Maskooki
%J Chemical and Biochemical Engineering Quarterly
%@ 0352-9568
%D 2012

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