ACIDIC AND CATALYTIC PROPERTIES OF PRODUCTS FROM SULFATING GAMMA-AL2O3

IR spectroscopy of adsorbed probe molecules of pyridine (Py), CO, and CDCl3 has been used to study the surface centers of products obtained by the interaction of sulfuric acid and gamma-Al2O3. It has been shown that three types of aprotic centers are present on the surface of the se products, with Q = 34-37, 39-43.5, and 47.5 - 51.5 kJ/mole. The str ength and concentration of these centers depend on the content of sulf ate and the temperature of treatment.. Also present on the surface of the specimens are protic centers, the strength of which remains practi cally unchanged and coincides with the strength of the centers of the crystalline salt Al2(SO4)3 (PA = 1180-1200 kJ/mole). The concentration of protic centers is also determined by the content of sulfate and th e temperature of treatment. A comparison of the values obtained for th e acidic characteristics of these catalysts and their catalytic activi ties in the isomerization of 1-butene to 2-butenes has shown that this reaction proceeds mainly with the participation of protic centers.