Effect of the vi group metals on the catalytic pyrolysis of lover alkanes

Catalytic pyrolysis of lower hydrocarbons С1-С4 was studied in a continuous flow tubular reactor in the presence of complex catalysts containing the VI group metals Cr, Mo, W, applied as salts or acids on a ceramic support with subsequent thermal treatment. Investigations was carried out in the temperature range 500-850 °С, gas mixture flow rate 25-100 mL/min, contact time with the catalyst 0.65-2.7 s, the value of factor of heterogeneity S/V 5.6×105 cm-1. The catalytic activity of the metal-containing compositions is compared, the effect of the metal nature on the yield of ethylene and propylene is studied and soot formation is estimated. The kinetic and activation parameters for decomposition of the hydrocarbon mixture and accumulation of the products are calculated. The best results were observed for the catalyst on the basis ceramic support was the Cr-containing catalyst.