Study in Synthesis and Catalytic Performance of Gallium-Promoted Sulfated Mesoporous Zirconia Catalysts
Date Issued
2008
Date
2008
Author(s)
Lin, Shu-Yu
Abstract
The isomerization of light paraffins to branched isomers was an important process in improving the octane number of gasoline. We have synthesized sulfated mesoporous zirconia using C16TAB as template and Zr(O-nPr)4 as zirconium precursor , then the promoter of Ga was introduced to give Ga-promoted sulfated mesoporous zirconia (donated as m-GSZ). The small amount of Ga not only retarded the phase transformation of zirconia from tetragonal to monoclinic, and retain more sulfur, but also stabilized the mesostructure of m-GSZ catalysts. The n-butane isomerization was used as the test reaction for the catalytic system at 200℃. We also compared the catalytic activities of the m-GSZ catalyst with the Al-promoted SZ catalyst, and the m-GSZ showed much stronger activities than the m-ASZ. From TPR experiment, in situ n-butane-DRIFT and using potassium permanganate as a powerful indicator, we could attribute the better activities of the m-GSZ catalysts to their better redox behavior. Now, we can obtain the excellent catalytic activities at a very low reaction temperature of 120℃ by controlling the ratio of n-butane to H2 of the reaction condition.
Subjects
sulfated zirconia
n-butane isomerization
surface acidity
Type
thesis
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