ORGANIC CHEMISTRY Chapter 4 4 IC Cracking(裂化) o Catalytic cracking-gas oil fraction is heated at 400- 500C in the presence of catalysts and cracking into smaller molecules suitable for use in gasoline Thermal cracking一 in the absence of a catalysis- unbranched alkanes- low octane ratin Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 4.1C Cracking (裂化) Catalytic cracking — gas oil fraction is heated at 400 ~ 500 in the presence of catalysts and “cracking” into smaller molecules suitable for use in gasoline Thermal cracking — in the absence of a catalysis — unbranched alkanes — low “octane rating