초록 ▼

Hydrocarbon feedstocks containing relatively high levels of vanadium contaminants are converted by catalytic cracking to products of lower average molecular weight by contacting the feedstock with a catalyst comprising (1) a crystalline aluminosilicate zeolite dispersed in a matrix and (2) a vanadiu

Hydrocarbon feedstocks containing relatively high levels of vanadium contaminants are converted by catalytic cracking to products of lower average molecular weight by contacting the feedstock with a catalyst comprising (1) a crystalline aluminosilicate zeolite dispersed in a matrix and (2) a vanadium passivating agent selected from the group consisting of cerium, praseodymium, neodymium, gadolinium and compounds thereof. The passivating agent is present in the catalyst in an amount greater than about 1.0 weight percent, calculated as the oxide of the vanadium passivating agent and based on the carbon-free weight of the catalyst. The passivating agent is also present in an amount such that the weight ratio of the passivating agent to any lanthanum present in the catalyst, calculated based on the respective oxides, is greater than about 1.0. The total weight of all rare earths present in the catalyst is greater than about 2.0 weight percent, calculated based on the respective rare earth oxides and on the carbon-free weight of the catalyst.

대표청구항 ▼

A process for the catalytic cracking of a vanadium-containing hydrocarbon feedstock which process comprises contacting said hydrocarbon feedstock with a cracking catalyst under cracking conditions in the substantial absence of added molecular hydrogen in a cracking zone to convert components of said

A process for the catalytic cracking of a vanadium-containing hydrocarbon feedstock which process comprises contacting said hydrocarbon feedstock with a cracking catalyst under cracking conditions in the substantial absence of added molecular hydrogen in a cracking zone to convert components of said feedstock into lower molecular weight constituents, said cracking catalyst comprising: (a) a crystalline aluminosilicate zeolite dispersed in a matrix; and (b) a vanadium passivating agent selected from the group consisting of cerium and neodymium and compounds thereof, said passivating agent being present in said catalyst in an amount greater than about 1.0 weight percent, calculated as the oxide of said vanadium passivating agent and based on the carbon-free weight of said catalyst, and in an amount such that the weight ratio of said passivating agent to any lanthanum present in said catalyst, calculated based on the respective oxides, is greater than about 1.0, and wherein the total weight of all rare earths present in said catalyst is greater than about 2.0 weight percent, calculated based on the respective rare earth oxides and on the carbon-free weight of said catalyst, and wherein after said vanadium passivating agent is added to the dispersion of said crystalline aluminosilicate zeolite in said matrix to form said catalyst there is no subsequent treatment of said catalyst to induce precipitation of said passivating agent.