n-Butane Isomerization Catalyzed by Sulfated Zirconia Nanocrystals Supported on Silica or γ-Alumina |
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| Authors: | Xiaobo Yang Rolf E Jentoft Friederike C Jentoft |
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| Affiliation: | (1) Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany |
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| Abstract: | Supported sulfated zirconia catalysts with zirconia contents of 10, 20 and 50 wt% were prepared by impregnation of SiO2 and γ-Al2O3 supports with H2SO4/ Zr(SO4)2 solutions followed by calcination at 923 K. The catalysts were characterized by X-ray diffraction, extended X-ray absorption
fine structure measurements, thermal analysis, UV–vis spectroscopy, and electron microscopy. Tetragonal zirconia was detected
in all silica-supported samples but only in the 50 wt% zirconia-containing alumina-supported sample, indicating high dispersion
of zirconia on alumina. Alumina-supported samples retained additional sulfate, at least in part as Al2(SO4)3. All samples were active in n-butane isomerization (1 kPa n-butane, 378 K). There was no relation between the presence of tetragonal zirconia in these samples and the catalytic performance. |
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| Keywords: | sulfated zirconia supported catalyst n-butane isomerization bulk crystalline phase alumina silica XRD TEM SEM EXAFS thermal analysis |
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