Amorphous silica-alumina, a carrier combination and a hydrocracking catalyst containing the same, and processes for the preparation thereof
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United States of America Patent
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Jun 4, 2002
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N/A
app pub date -
Nov 12, 1999
filing date -
Nov 13, 1998
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Abstract
An acidic amorphous silica-amumina has a large specific surface area and a large pore volume. A carrier complex and a hydrotreating catalyst containing acidic amorphous silica-alumina, in particular a hydrocracking catalyst containing acidic amorphous silica-alumina in combination with a modified zeolite-Y, treats petroleum hydrocarbon materials to produce middle distillates. The amorphous silica-alumina has a SiO.sub.2 content of 10-50 wt. %, a specific surface area of 300-600 m.sup.2 /g, a pore volume of 0.8-1.5 ml/g and an IR acidity of 0.25-0.60 mmol/g. The catalyst shows a relatively high activity and mid-distillate selectivity and can be particularly used in hydrocracking process for producing mid-distillates with a higher yield.
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