COMPOSITION AND PROPERTIES OF THE PRODUCTS OF THE REACTION OF GAMMA-AL2O3 WITH GASEOUS SO3

The products of the reaction of gamma-Al2O3 with SO3 were prepared in a static system over the 25-450-degrees-C range. It was shown by a com bination of methods (chemical analysis, Al-27 NMR, and x-ray diffracti on) that on the absorption of SO3, a part of the oxide is amorphized a nd x-ray amorphous products are formed, in the composition of which Al (SO4)n fragments enter, with n = 1-6. The specific surface of the prod ucts decreases with increasing sulfate content. The specific activity in the isomerization of 1-butene is constant over a wide range of conc entrations and equal to the activity of massive, crystalline sulfate r oasted at 650-degrees-C.