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AssigneeW. R. Grace & Co.-Conn.
InventorsAlan W. Peters, John A. Rudesill, Gordon Dean Weatherbee, Edward F. Rakiewicz, Mary Jane A. Barbato-Grauso, Xinjin Zhao
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Compositions comprising a component containing (i) an acidic oxide support, (ii) an alkali metal and/or alkaline earth metal or mixtures thereof, (iii) a transition metal oxide having oxygen storage capability, and (iv) a transition metal selected from Groups Ib and/or IIb of the Periodic Table provide NOx control performance in FCC processes. The acidic oxide support preferably contains silica alumina. Ceria is the preferred oxygen storage oxide. Cu and Ag are preferred Group I/IIb transition metals. The compositions are especially useful in the cracking of hydrocarbon feedstocks having above average nitrogen content.
A NOx removal composition suitable for reducing NOx emissions during catalyst regeneration in a fluid catalytic cracking process, said composition comprising particles having a particle size of about 20-200 μm and comprising (i) an acidic oxide support containing at least 50 wt % alumina, (ii) about 1-10 parts by weight, measured as alkali metal oxide, of at least one alkali metal, (iii) at least 1 part by weight of CeO2 and (iv) about 0.01-5.0 parts by weight, measured as metal oxide, of a transition metal selected from Group Ib of the Periodic Table, all of said parts by weight being per 100 parts by weight of said acidic oxide support material.
A fluid cracking catalyst comprising (a) a cracking component suitable for catalyzing the cracking of hydrocarbons, and (b) a NOx reduction component comprising (i) an acidic oxide support containing at least 50 wt % alumina, (ii) about 1-10 parts by weight, measured as alkali metal oxide, of at least one alkali metal;
A method of reducing NOx emissions during fluid cracking of a hydrocarbon feedstock into lower molecular weight components, said method comprising contacting a hydrocarbon feedstock with a cracking catalyst at elevated temperature whereby lower molecular weight hydrocarbon components are formed, said cracking catalyst comprising (a) a cracking component suitable for catalyzing the cracking of hydrocarbons, and (b) a NOx reduction component comprising (i) an acidic oxide support containing at least 50 wt % alumina, (ii) about 1-10 parts by weight, measured as alkali metal oxide, of at least one alkali metal;
Dependencies are inferred from the claim text.