Abstract:
Process for preparing zeolites of X type having an Si/Al atomic ratio of ≦1.5 and having exchangeable cations including lithium, trivalent and/or divalent ions, and optionally sodium, potassium, ammonium and/or hydronium ions, involves distributing starting zeolite in a series of receptacles, percolating a solution of at least one lithium compound through the series, drawing a lithium-containing bleed from first receptacle of the carrousel, and drawing off a final effluent stream from a final receptacle in the series. The effluent stream contains compounds of exchangeable cations from the starting zeolite and traces of the lithium compound(s). After a desired degree of lithium exchange has occurred in the first receptacle, the first receptacle is removed and a fresh solution of at least one lithium compound is introduced into the next receptable in the series and percolated through the series. This step can be performed for each receptacle in the series.
Abstract:
A fluid catalytic cracking catalyst made from microspheres that initially contain kaolin, a dispersible boehmite alumina and a sodium silicate or silica sol binder. The kaolin portion contains hydrous kaolin and a particular kaolin which has been calcined through its characteristic exotherm and which produces a catalyst having a novel morphology comprising a macroporous matrix and crystallized zeolite freely coating the walls of the pores of the matrix. Calcination of the hydrous kaolin to metakaolin and formation of in-situ zeolite by treatment with sodium silicate yields a catalyst containing Y-faujasite and transforms the dispersible boehmite into a transitional alumina. The catalyst can be used to crack resid or resid-containing feeds as the alumina phase formed from the dispersible boehmite passivates nickel and vanadium contaminants.
Abstract:
An improved catalyst for edible oil hydrogenation produced by the incorporation of a sulphur adsorbing zeolite with a supported nickel hydrogenation catalyst. The zeolite is a cation-exchanged form of low silica faujasite with a silica to alumina ratio from about 1.8 to 2.1. The hydrogenation catalyst is a supported nickel catalyst. The zeolite is incorporated into the stabilization media with the reduced hydrogenation catalyst to form a physical blend of sulphur adsorbing zeolite and reduced nickel hydrogenation catalyst in a stabilization medium.
Abstract:
A catalyst composition is disclosed comprising a zeolite having a non-framework aluminum content of about less than 25 percent of the total aluminum content, a bulk silica:alumina ratio of about 6.5 to about 10.0 and a unit cell size ranging from about 2.440 to about 2.464 nm.
Abstract:
A process for preparing a hydrocarbon conversion catalyst for use in a Fluid Catalyst Cracking (FCC) unit includes the steps of preparing a modified alumina-silica composite by reacting alumina with an acid to obtain an acidified alumina, aging the acidified alumina for from 0.25 to 60 hours, adding a silica source to the acidified alumina to obtain the composite; preparing a dispersed precursor slurry of the modified alumina-silica composite, and a rare earth exchanged USY zeolite (REUSY) containing at least one rare earth oxide present in an amount ranging from 3.8 to 4.0 wt %, and optionally kaolin clay; spray-drying the slurry to obtain spherical particles; and subjecting the spherical particles to calcination.
Abstract:
A process for manufacturing particles of type X zeolite exchanged with at least lithium cations and having an Si/Al ratio less than or equal to 1.5, in which (a) at least one mother liquor containing lithium salts having a molar purity in excess of 95% is percolated through a bed of zeolite particles, the mother liquor making it possible to obtain a limit exchange factor (LEF) for the zeolite particles of between 90 and 100%, (b) the percolation of the mother liquor is stopped when an amount of mother liquor has been used which makes it possible to obtain a mean real exchange factor (REF) such that: REF=LEF−2%±1%; and (c) the lithium-exchanged zeolite particles are recovered. The particles of faujasite, preferably X, zeolite exchanged to at least 88% with lithium cations and having an Si/Al ratio less than or equal to 1.5 which are obtained by such a manufacturing process can be used as adsorbent in a PSA, preferably VSA, process for separating or purifying a gas flow.
Abstract:
A fluid catalytic cracking catalyst made from microspheres that initially contain kaolin, a dispersible boehmite alumina and a sodium silicate or silica sol binder. The kaolin portion contains hydrous kaolin and optionally spinel, or mullite, or both spinel and mullite made via kaolin which has been calcined through its characteristic exotherm. Calcination of the hydrous clay to metakaolin and formation of in-situ zeolite by treatment with sodium silicate yields a catalyst containing Y-faujasite and transforms the dispersible boehmite into a transitional alumina. The catalyst can be used to crack resid or resid-containing feeds as the alumina phase formed from the dispersible boehmite passivates nickel and vanadium contaminants.
Abstract:
A catalyst suitable for use in fluid catalytic cracking of petroleum feedstock in the form of particulate of crystalline zeolite having a coating on it6s surface comprising bayerite phase alumina.
Abstract:
A hydrogenation catalyst including a carrier of ultrastable zeolite Y modified with at least one heavy rare earth element selected from ytterbium, gadolinium, terbium and dysprosium. At least one catalytic metal selected from palladium and platinum is supported on the carrier. A process for hydrogenating a feed containing an aromatic and/or a heterocyclic aromatic compound includes a step of contacting the feed with hydrogen in the presence of the above hydrogenation catalyst.
Abstract:
Zeolites exchanged with lithium cations and polyvalent cations are prepared by first partially ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with polyvalent cations, then heat-treating the partially polyvalent cation-exchanged zeolite, then ion exchanging the heat-treated zeolite with ammonium cations, and then reacting the ammonium cation-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone.