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• W1997775789 abstract "Sulfated zirconia (SZ) was supported on mesoporous molecular sieves MCM-41 by impregnation of zirconium sulfate followed by calcination. The nanochannels of MCM-41 provide a large surface area for the solid state dispersion of zirconium sulfate and a steric restriction on formation of zirconia nanoparticles. The catalysts were tested in n-butane isomerization. With the addition of a proper amount of alumina as a promoter, denoted as ASZ/MCM-41, the catalytic activity was dramatically improved in comparison to the activities of SZ/MCM-41. The increase of activity was determined primarily by the amount of aluminum added and the temperature of calcination. The SZ/MCM-41 catalysts were characterized by X-ray diffraction (XRD), high resolution TEM (HR-TEM), NH3 adsorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption (EXAFS). In particular, the Zr K-edge EXAFS data give one a measure of the degree of dispersion of zirconia on the surface of MCM-41. The trend of the promotion effects of alumina on SZ in butane isomerization is not monotonic; there is an optimum level of Al-loading for high activity. It is explained based on three quantitative factors: increased sulfur loadings, balanced distribution of Lewis and Brønsted acid sites, and higher dispersion of zirconia." @default.
• W1997775789 created "2016-06-24" @default.
• W1997775789 creator A5085884434 @default.
• W1997775789 creator A5091570523 @default.
• W1997775789 date "2008-04-01" @default.
• W1997775789 modified "2023-09-27" @default.
• W1997775789 title "Characterizations of aluminum-promoted sulfated zirconia on mesoporous MCM-41 silica: Butane isomerization" @default.
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• W1997775789 doi "https://doi.org/10.1016/j.micromeso.2007.06.030" @default.
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