| 摘要 |
PURPOSE:To develop a catalyst for catalytic hydrogenating dealkylation of alkyl arom. hydrocarbons which has high activity and a long life and is regeneratable, by depositing Ir and alkaline earth metals on an alumina carrier. CONSTITUTION:Noncrystalline gamma the alumina having properties of 50-300m<2>/g surface area and 0.2-0.8ml/g pore volume is used as a carrier, and an aq. soln. of chloride boride, iodide, nitrate, sulfate or other water-soluble salts of alkaline earth metals such as Mg, Ca, Sr, Ba or the like is impregnated in the carrier which is then burned for 5hrs at 500 deg.C. An aq. soln. of chloride, etc. of Ir is impregnated in the surface, whereafter the carrier is dried to disperse and deposit Ir on the alumina carrier. Hydrocarbon oils contg. alkyl arom. compds. are dealkylated in the presence of hydrogen at 5-30kg/cm<2>G pressure, 0.1-3.0vol./ vol. per hour space velocity of liquid, 2-20mol/mol hydrogen/raw material ratio and 400-500 deg.C by using such catalyst. |
