The Effect of Rare Earth Modification on the Structure and Catalytic Performance of SO₄^2-/ZrO₂ Solid Acid Catalysts

Abstract:

Rare earth modified SO^2-₄/ZrO2 solid acid catalysts were prepared by coprecipitation and impregnation methods respectively. The properties of the samples were characterized by XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy). And their catalytic performances were evaluated and investigated by transesterification of waste oil with methanol. The results showed that the catalyst containing 4% Ce and calcined at 550°C displayed the highest production rate and the better reuse ability than the others. 63.5% yield of fatty acid methyl ester was achieved. An analysis of XRD patterns reveal that the incorporation of rare earth into tetragonal zirconia stabilizes the compound, and the calcination at 550°C increases the reactivity of the catalyst by producing a greater fraction of active tetragonal zirconia. It can be seen from the FT-IR spectra that superacids structures are formed in the catalysts and the acidity is strengthened remarkably and the activated centre of the catalyst were increasesed.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 1375-1378
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.1375
• Online since: July 2011
• Authors: Ying Chen, Bao Hui Wang, Xue Sun, Hui Li
• Keywords: Bio-Diesel, Calcination Temperature, Rare Earth Element (REE), Solid Superacids, Transesterification

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