Effect of Lanthanum Additive on Physicochemical and Catalytic Properties of γ-Al2O3 in the Process of Propane Conversion into Olefin Hydrocarbons

The effect of lanthanum concentration and introduction method on the physicochemical and catalytic properties of γ-Al2O3 in the process of propane conversion into olefin hydrocarbons was studied. It was found that modification of aluminum oxide with lanthanum by impregnation method resulted in decrease of the specific surface of the catalyst and increase of the pore size of the catalyst. Acid testing showed that the mode of administration and the concentration of lanthanum resulted in a change in the acid properties of γ-Al2O3. It was been found that the addition of lanthanum to alumina increases the activity and selectivity of the catalyst during the conversion of propane to olefinic hydrocarbons. The most effective catalyst of this process is γ-Al2O3 containing 4.0% La introduced by impregnation method. Selectivity of olefin hydrocarbons formation on it at the reaction temperature of 650°C is 63.3%, with the propane conversion degree of 58%.