ABSTRACT
There is a growing understanding and acceptance of the fact that when they are supported on crystalline and oriented structures many catalysts assume the orientation and spacing of the support. Usually the desired catalyst orientation is best achieved by suspending the support material in a solution of the catalytic material and then incipiently and slowly precipitating the catalytic material onto the support in such a way that it has an opportunity to orient on the support. On occasion it may be necessary to establish an anchor coat on denser, less penetrable support materials. The anchor coat most frequently used at present is alumina from basic aluminum nitrate as a relatively thin slurry. This anchor coating, after being placed on the support, is frequently fired or calcined at sufficiently high temperature to decompose the hydroxynitrate to form high surface area Al2O3.
