| 摘要 |
<p>It is known to prepare porous aluminous bodies to act as catalysis or carriers for catalysis in various industrial processes. Unfortunately, such aluminous bodies do not have sufficient mechanical strength and tend to physically breakdown when in use at temperatures in the order of about 1,000.degree.C. Thus, the utility of the known porous aluminous bodies is restricted. The present invention seeks to overcome this drawback by providing porous aluminous bodies having a resistance to crushing of from about 2 kg to about 18 kg; produced by humidification and agglomeration of compositions in powder form comprising at least 15% by weight bayerite prepared by the action of hot gases on a hydrated alumina comprising bayerite said bayerite containing no more than 10% by weight residual water which can be removed by high temperature calcination, from 0 to about 70% by weight of an element selected from the group comprising cellulose, zeolites, molecular sieves, oxides and metals and the balance alumina, the agglomeration operation being followed by activation by calcination at a temperature of from about 600.degree.C to about 1,000.degree.C for a period of time from about 2 to 24 hours.</p> |
