HYBRID CATALYSTS FOR THE DEEP CATALYTIC CRACKING OF PETROLEUM NAPHTHAS AND OTHER HYDROCARBON FEEDSTOCKS FOR THE SELECTIVE PRODUCTION OF LIGHT OLEFINS

摘要

Provided herein are the hybrid catalysts used in the deep catalytic crackingof petroleumnaphthas or other hydrocarbon feedstocks for the selective production of lightolefins, inparticular ethylene and propylene. The hybrid catalysts of this inventioncontain achemically treated microporous crystalline silicate such as the pentasil-typesilicalite, amesoporous silica-alumina cocatalyst, into which may be incorporated aluminiumoxide,molydenum oxide or a mixture of aluminum and molydenum oxides, and aninorganicbinder such as bentonite clay. These novel catalysts show several advantageswithrespect to the classical steam (thermal) cracking : i) higher combinedproduction ofethylene and propylene; ii) lower ethylenel propylene ratio; iii) much lowerproduction ofmethane ; iv) much lower reaction temperature resulting in significant energysavings; v)easy in-situ regeneration using air as oxidant; vi) lower carbon dioxide andother volatileoxides emitted during the regeneration phase.