Modified mcm-56, its preparation and use

Details Modified mcm-56, its preparation and use Modified mcm-56, its preparation and use

C - Chemistry, Metallurgy

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C01B 39/24 (2006.01) B01J 29/08 (2006.01) C01B 33/38 (2006.01) C07C 2/58 (2006.01) C07C 2/66 (2006.01) C07C 4/06 (2006.01) C10G 11/05 (2006.01) C10G 47/12 (2006.01)

Patent

CA 2260937

A layered composition of matter, MCM-56, has an X-ray diffraction including the lines listed in Table (II) and has been selectively modified so that the ratio of the num-ber of active acid sites at its external surface to the number of internal active acid sites is greater than that of the un-modified material. When used as an additive to a large pore zeolite catalyst in the catalytic cracking of a petroleum feedstock, the modified MCM-56 gives an improved gaso-line yield/octane relationship, an improved coke selectivity and a higher combined gasoline and potential alkylate yield than an identical catalyst containing unmodified MCM-56.

Cette composition de matière stratifiée, dite MCM-56, présente une diffraction des rayons X comprenant les lignes figurant dans la Table (II) et a été sélectivement modifiée de sorte que le rapport entre le nombre de sites acides actifs au niveau de sa surface externe et le nombre de sites acides actifs interne est supérieur à celui du matériau non modifié. Lorsqu'il est utilisé comme additif d'un catalyseur au zéolithe à larges pores dans le craquage catalytique d'une charge de pétrole, le MCM-56 modifié donne un rapport rendement en essence/octane amélioré, une meilleur sélectivité au coke et un rendement supérieur en essence et alkylat potentiel combinés qu'un catalyseur identique contenant du MCM-56 non modifié.

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