Abstract
The preparation, characterisation, and catalytic properties of alumina-pillared materials derived from an acid-treated host clay matrix is described. Various levels of acid treatment are studied in order to ascertain the level of acid treatment which yields pillared materials with the most suitable physicochemical properties and thermal stability. The pillared acid-activated clays prepared possess basal spacing (19.3 Å after thermal treatment at 500°C) and surface areas (315-374 m 2/g) comparable to conventional pillared clays but significantly higher pore volume (0.33-0.48 cm 3/g), average pore diameter and surface acidity. The improvement in acidity is mainly of the Brønsted acid type. As a result of improved acidity, the pillared acid-activated clays are better catalysts compared to conventional pillared clays and they exhibit activity indicative of the presence of strong Brønsted acid sites in the temperature range 250-400°C.
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