关键词: 烯烃, 催化裂化, 苯, 分子筛, 催化剂

Abstract: Using 1-hexene, 1-heptene, 1-octene, 1-nonene and 1-decene as model compounds, formation of benzene from olefins was studied under different reaction temperature, different space velocity with different zeolite catalysts in a small fixed fluidized bed reactor. The reaction paths of olefins to benzene and the influence of reaction conditions on olefins to benzene were discussed. The results showed that cyclization of C6 chain olefin to form cycloalkene and then to form benzene was the main reaction path of benzene formation. Under conventional catalytic cracking conditions, the yield of five olefins to benzene on USY catalyst is low. The yield of benzene is increased with the increase of temperature or the decrease of space velocity. The yield of benzene over Beta catalyst and ZRP catalyst is higher than that of REY catalyst and USY catalyst when 1-decene as feed. In order to reduce the amount of benzene in the catalytic cracking products, the reaction temperature should be lowered as much as possible, the space velocity should be increased, and the reaction should be carried out on a catalyst with a large pore size and a low acid density, within the allowed conditions.

Key words: olefins, catalytic cracking, benzene, molecular sieve, catalyst