Engelhard Minerals & Chemicals Corporation

Engelhard Corporation

Atlantic Richfield Company

Stanley M Brown

William J Reagan

Gerald M Woltermann

Vincent A Durante

Barry Keven Speronello

John W Byrne

Dennis J Olszanski

Harry E Jacobs

Sulfur oxides are removed at least partially from the gaseous regenerator effluent of a fluid catalytic cracking unit operated with feedstock containing sulfur compounds and converted to hydrogen sulfide in the cracking zone by associating sulfur oxides in the gas with at least one rare earth compound, preferably cerium or a rare earth mixture rich in cerium, supported on discrete particles of alumina. The alumina particles may be a component of particles of a composite fluid cracking catalyst or separate fluidizable entities other than cracking catalyst and physically admixed with the catalyst particles.

Catalytic cracking with reduced emissions of sulfur oxides

This application discloses novel fluid catalytic cracking catalysts comprising microspheres containing more than about 40%, preferably 50-70%, by weight Y-faujasite zeolite, methods for making such catalysts, and the use of such catalysts to crack petroleum feedstocks, particularly those containing large amounts of contaminant metals. The microspheres of the catalyst of the invention are characterized by a combination of desirable catalytic and physical characteristics, including exceptionally high activity, excellent hydrothermal stability, good to excellent attrition resistance, and desirable selectivity characteristics.

Fluid catalytic cracking catalyst comprising microspheres containing

High gas and coke make due to contamination of a zeolitic fluid cracking catalyst by metal species such as nickel and vanadium during a cracking process is reduced by adding a phosphorus compound to the process. When the catalyst already contains a metals passivating agent or such agents are used in the cracking process further significant reduction in gas and coke make is realized without significant increase in regenerator temperature by adding additional phosphorus.

Passivation of contaminant metals on cracking catalysts by phosphorus

This invention provides an improvement in the operation of an FCCU such as to maintain the octane rating of the gasoline fraction from the cracker at a high level over repeated cycles of cracking charge and regeneration by using fresh zeolitic catalyst particles having an alkali metal oxide less than about 1.5% (based on the zeolite content) and controlling the amount of alkali metal oxide that comes into contact with catalyst inventory throughout cracking, stripping and regeneration so as to maintain alkali metal oxide content of equilibrium catalyst below 2.0%, based on the weight of zeolite in the fresh zeolitic catalyst.

Process for production of high octane gasoline from catalytic cracking

An improved process for the production of mechanically strong shaped crystalline zeolitic aluminosilicate bodies from precursor bodies composed of kaolin clay calcined at elevated temperature, the crystallized bodies having essentially the same size and shape as the precursor bodies. Conversion of the calcined clay contained in the precursor bodies to a mixture of crystalline zeolitic alluminosilicate component and a porous amorphous silica-alumina component takes place as a result of reaction between the calcined clay and an aqueous alkaline liquid in which the bodies are immersed. The improved process features the presence of a solution of aluminosilicate nucleation centers during such reaction.

Zeolitized composite bodies and manufacture thereof

Zeolite catalyzed reduction of nitrogen oxides in exhaust gases is conducted with catalytic elements in the form of multi-channel structures in which parallel channels are defined by thin walls constituted by refractory oxides having zeolite dispersed therein and accessable to diffusion from surfaces of the channel walls. Such structures, preferably monolithic honeycomb forms, are prepared by calcining extruded or cast forms or kaolin at elevated temperatures and treating the calcined kaolin honeycomb with a caustic solution to develop a desired zeolite within the wall members and etch the wall surfaces to provide diffusion paths to and from the embedded zeolite. Such structures are peculiarly suited to high space velocity processes such as reduction of nitrogen oxides in providing for protection of the zeolite catalyst against erosion by high velocity gas streams while also providing adequate diffusivity for reactants at the high space velocities typical of the known reaction between oxides of nitrogen and a reducing agent such as ammonia.

Growing community of inventors

Scotch Plains, NJ, United States of America

Stanley M Brown