Abstract
AbstractThe surface acidic strength distribution in a series of silica‐alumina catalysts prepared by coprecipitation and stepwise precipitation techniques has been measured by the butylamine adsorption method. The amount of silica in the finished catalysts ranged from 86.0 to 96.9%. A linear relationship between the pH of the final gel (i.e. pH values of the solution in equilibrium with the gel material before washing) and X[=Al2O3/(SiO2+Al2O3)] was observed up to a certain level of pH; for coprecipitated catalysts it was 6.0 whereas for those precipitated stepwise the limit of pH was 7.0. Coprecipitated silica‐aluminas were more enriched with weak acid sites or Bronsted sites (pKa = +6.8) and their concentration reached a maximum at about 87% silica. Stepwise precipitated silica‐aluminas, on the other hand, have a greater population of strong acid sites, thus making them useful for cracking reactions.
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