Studies on catalytic pyrolysis of heavy oils: Reaction behaviors and mechanistic pathways

摘要: Abstract Catalytic pyrolysis of heavy oils on various catalysts was investigated in a confined fluidized bed reactor. As for catalytic Chinese Daqing atmospheric residue (Daqing AR) catalyst CEP-1, reaction temperature, residence time, weight ratios catalyst-to-oil, steam-to-oil and feed properties have significant influence product yields distribution. The optimal laboratory operating conditions are as follows: temperature is within 650–680 °C, time 2.0–4.0 s catalyst-to-oil ratio 13–18. ability becomes better the light olefins become higher with larger H/C mol lower aromatic carbon content feedstocks. After cracking mechanisms hydrocarbons analyzed thermal AR investigated, mechanism parameter RM proposed to study mechanistic pathways oil pyrolysis. processes LCM-5 relative acting percentage free radical that carbonium ion obtained.