Preparation And Application Of Spherical Alumina

The spherical alumina is an important chemical products, because it has a lower bulk density, higher crushing intensity, and suitable pore volume, and pore size, it is a very good catalyst or catalyst support. It was widely used in the field of petrochemical and fine chemical. In this paper, different preparation methods of spherical alumina with large pore were studied, and the difference was studied. At last, affect of aging temperature of the supports on the catalytic activity of long chain alkane dehydrogenation catalysts. In this paper, the main research contents and conclusions were as follows:1. The preparation of alumina sol:two methods were used to prepare alumina sol, which were hydrochloric acid reflux method and aluminum nitrate and ammonia method, respectively. Alumina sol with certain physical and chemical properties was successfully prepared by two methods. The two kinds of alumina sol were different in color and pH and hydrochloric acid reflux had a higher solid content.2. The preparation and application of spherical alumina:Spherical aluminum oxide was prepared with hydrochloric acid reflux method. The bulk density was0.3g.cm-3-0.5g.cm-3, intensity was10N-40N, it indicated that this alumina was more suitable for use in a long chain alkane dehydrogenation; While spherical aluminum oxide prepared by aluminum nitrate method had bulk density of0.2g.cm-3-0.6g.cm-3, intensity of20N-50N, which was.more suitable for isobutene dehydrogenation.3. Effect of aging temperature of support on the catalytic activity of long chain alkane dehydrogenation catalyst:The spherical alumina was prepared by oil-column shaping. The effect of aging temperatures of Al2O3on the performance of dehydrogenation catalysts was studied. The supports were characterized by BET and NH3-TPD. In addition, bulk density and strength were measured. The results showed that the aging temperatures had great effect on the acid strength and acid content of the support surface. With the increase of aging temperatures, the acid strength and acid content in creased, which led to the decrease of mono-olefins yield.