A promising path for utilization of secondary naphtha cuts is pyrolysis to produce gaseous feedstocks for petrochemical production. Catalytic pyrolysis in the presence of bariumcontaining catalysts is of practical interest. The process which is carried out without steam dilution of the feed is described. The influence of feedstock mass velocity in pyrolysis on the gas yield and the total yield is shown. Catalytic pyrolysis offers a means for efficient processing of these feedstocks to obtain olefin-rich gas.