Catalytic cracking catalyst compositions and processes for cracking hydrocarbons to maximize light olefins production are disclosed. Catalyst compositions comprise at least one zeolite having catalytic cracking activity under catalytic cracking conditions, preferably Y-type zeolite, which zeolite has low amounts of yttrium in specified ratios to rare earth metals exchanged on the zeolite. Catalyst and processes of the invention provide increased yields of light olefins and gasoline olefins during a FCC process as compared to conventional lanthanum containing Y-type zeolite FCC catalysts.

High light olefins fcc catalyst compositions

This invention relates to a process of preparing a catalyst from zeolite and peptized alumina. The invention comprises adding a yttrium compound to the zeolite, either prior to, during, or after its combination with the peptized alumina. The yttrium compound can be added to the zeolite via exchange of yttrium onto the zeolite prior to addition of peptized alumina, or the yttrium can be added as a soluble salt during the combination of the zeolite and peptized alumina. In either embodiment, the zeolite catalyst is then formed from the zeolite, yttrium and peptized alumina, optionally containing other inorganic oxide. This invention is suitable for preparing fluid cracking catalysts.

Process for making improved zeolite catalysts from peptized aluminas

A process for treating a zeolite catalyst for the carbonylation of dimethyl ether to produce methyl acetate in which the catalyst is contacted with a treatment gas comprising water vapour in an amount of at least 1 mol% and at a temperature below which dealumination of the zeolite structure occurs.

Process for treating zeolite catalysts

This invention relates to a process of preparing an improved catalyst comprising a clay derived zeolite. In particular, the invention comprises combining an yttrium compound with a zeolite produced by treating clay with a silica source and under alkaline conditions. The clay derived zeolite can be further combined with conventional matrix and/or binder precursors to form particulates suitable for use as catalysts in fluid catalytic cracking (FCC). Alternatively, the clay that is treated with the silica source and alkaline conditions can be in particulate form having sizes suitable for use in FCC, and the zeolite is produced in situ within the particulate. Yttrium compound is then combined with the zeolite in the particulate, e.g., via impregnation. It has been shown that the addition of the yttrium compound improves zeolite surface area retention, and zeolite stability in catalysts comprising clay derived zeolites.

Process for making improved catalysts from clay-derived zeolites

A process is disclosed for obtaining a granular zeolite from naturally occurring argillaceous material. The invention relates to the field of processing natural materials, in particular the production of granular synthetic zeolites. The invention permits the use of a wide range of natural clays, widens the raw material base for manufacturing granular synthetic zeolites, and boosts the active zeolite content in the granules. To these ends the initial raw material is mixed with a neutral aluminium salt and caustic soda, aluminium hydroxide or silicon dioxide being introduced into the reaction mixture at the same time; the mixture is subjected to steam-heat treatment followed by thermal activation, and is then mixed with an alumino-silico-hydro gel until a homogenous slurry is formed. The neutral aluminium salt used can be, for example, aluminium sulphate. The argillaceous raw material, neutral aluminium salt and sodium hydroxide are mixed in the following respective proportions: 100 : 0.05 : 0.02. The mixture is steam-heat treated for 10 to 60 minutes at a temperature of 110 to 250 °C.

Kiselev Vladimir B

Papers

A process for obtaining granular zeolite from naturally occurring argillaceous material