Macroscopic deactivation kinetics of Pt-Sn catalyst in isobutane dehydrogenation for isobutene

The deactivation kinetics of Pt-Sn catalysts in isobutane dehydrogenation for isobutene was investigated in a fixed-bed reactor.The results showed that the external diffusion had little influence on isobutane dehydrogenation,which could be neglected(the relative concentration difference of isobutane 0.2%-0.6%,temperature difference 0.30-0.55℃),and the internal diffusion had a certain influence on the dehydrogenation rate(the temperature difference 0.10-0.25℃,the efficiency factor 0.80-0.95).The service life of the catalyst lasted for one day,its activity reduced slowly within 0-17h and quickly at 17h.