Abstract
Amorphous silica-aluminas with enhanced BrĂžnsted acidity have been successfully synthesized via a novel acetic acid based sol-gel process. The resulting amorphous silica-aluminas possess an irregular spherical morphology, homogeneously element dispersion, and a high external surface area in the range of 374â594 m2/g with little contribution from micropores. By simply adjusting the molar Si/Al ratio in the synthesis precursor solution from 0.5 to 2.0, the total BrĂžnsted acid site density firstly increases and then slightly decreases, consistent with the trend of summarized molar content of four and five-coordinated aluminum species. Among them, the amorphous silica-alumina with initial Si/Al ratio of 1.5 exhibits the highest BrĂžnsted acid site density, and its supported Pt catalyst performs the highest activity resembling that of HBeta-based catalyst in the hydroisomerization of n-hexadecane. Meanwhile, a superior catalytic selectivity to multibranched isomers was received over the amorphous silica-alumina without strong BrĂžnsted acid sites. Moreover, a remarkable stability (>2000 h) was also achieved in the hydrocracking of Fischer-Tropsch wax under industrially relevant reaction conditions. This sol-gel synthesis process provides a facile method to prepare amorphous silica-aluminas with outstanding texture and acid properties for catalytic refining in petrochemical fields.
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