2738.     PRATT, T. W.  Aromatic Adsorption Index for the Estimation of Surface Area and Catalytic Activity.  Petrol. Processing, vol. 2, 1947, p. 946.

        Paper presented at the 27^th annual American Petroleum Institute meeting in Chicago.  The aromatic adsorption index provides a means for rapidly and simply detecting changes in the catalytic surface available and changes in activity owing to the destruction of catalytic surface either by heat or steam.  Detailed procedure for the determination of the aromatic adsorption index, as well as experimental data and correlations concerning the effect of variables upon the value, are given, and the steps to be taken in determining the index are described.  Correlations of the aromatic adsorption index with activity for type “A” and other synthetic catalysts show the estimated activity of a given sample can be expected to be within + or -2% (conversion) of the true activity.  In most cases correlations for catalysts from the same source used in different units under different conditions will be accurate enough for the estimation of activity.