US 5,229,347 AGranted

Catalyst for mild hydrocracking of cracked feedstocks and method for its preparation

AssigneeIntevep, S.A.

InventorsRicardo Prada, Roberto Galiasso, Yilda Romero, Edito Reyes, Richard Munoz

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Abstract

A catalyst suitable for mild-hydrocracking of cracked petroleum hydrocarbon feedstocks and selective to diesel fuels contains a catalytically active metal phase constituted by a Group VI-B element, a Group VIII first transition series element and a Group VIII second transition series element, all supported on a titania-alumina support containing about 5% to about 30% by weight titania in the support. The support is prepared by combining titanium oxide and aluminum oxide hydrogels, in appropriate proportions, followed by extrusion, drying, and calcination. The catalytically active metal phase is introduced onto the support by impregnation followed by drying and calcination. The catalytically active metal phase is then sulfided. The produced catalyst is suitable for hydrodesulfurization, hydrodenitrogenation, mild-hydrocracking and aromatics hydrogenation of previously cracked petroleum hydrocarbon feedstocks.

Claims29

Dependent claims

A catalyst for mild hydrocracking of cracked petroleum feedstocks comprising:

a porous support comprising alumina and titania;
wherein the alumina is present in an amount in the range of about 95 to about 70 weight percent, and wherein the titania is present in an amount of about 5 to about 30 weight percent, both based on the weight of the support;
and
a catalytically active tri-elemental phase on the support consisting essentially of a transition element of Group VI-B of the Periodic Table of Elements, a transition element of the first transition series of Group VIII of the Periodic Table of Elements, and a transition element of the second transition series of Group VIII of the Periodic Table of Elements;
said porous support having a surface area in the range of about 130 m.sup.2 /gram to about 300 m.sup.2 /gram and at least about 95 percent of the pores thereof having a pore diameter in the range of about 20 Angstroms to about 500 Angstroms;
and
said Group VI-B transition element being present in an amount in the range of about 6 weight percent to about 30 weight percent, expressed as weight of the corresponding oxide and based on the weight of the catalyst, said Group VIII first transition series element being present in an amount in the range of about 2 weight percent to about 10 weight percent, expressed as weight of the corresponding oxide and based on the weight of the catalyst, and said Group VIII second transition series element being present in an amount in the range of about 0.1 weight percent to about 1 weight percent, based on the weight of the catalyst.

4 more elements

A method for making a catalyst suitable for the mild hydrocracking of cracked feedstocks with significant amounts of sulfur, nitrogen, and aromatic components, which method comprises:

providing an alumina-titania support structure which contains about 95 to about 70 weight percent alumina and about 5 to about 30 weight percent titania, based on the weight of the support structure;
the support structure having a pore volume in the range of about 0.4 to about 0.8 cm.sup.3 /gram, a surface area in the range of about 130 to about 300 m.sup.2 /gram, and having at least about 95 percent of the pores of a diameter in the range of about 20 Angstroms to about 500 Angstroms;
impregnating the alumina-titania support with a first component selected from Group VI-B of the Periodic Table, the impregnation taking place in an aqueous solution, buffered at a pH value in the range of about 4 to about 6, of a salt of the first metallic component so as to obtain a catalyst composition that is about 6% to about 30% by weight of the first component expressed as the weight of the corresponding oxide of the component;
drying the impregnated support;
calcining the impregnated support;
further impregnating the dried, impregnated support with a second elemental component selected from the first transition series of Group VIII of the Periodic Table, so as to obtain a catalyst composition that is about 2 to about 10 by weight of the oxide of the second component based on the weight of the catalyst, and with a third elemental component selected from the second transition series of Group VIII of the Periodic Table so as to obtain a concentration of about 0.1% to about 1% by weight of the third component on the catalyst, based on the weight of the catalyst;
drying the further impregnated support;
and
calcining the dried, further impregnated support.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/697,118Filed 8 May 1991
Granted: 20 Jul 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

B01J 21/063
Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof: titanium; Oxides or hydroxides thereof
B01J 23/8993
Also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36: with chromium, molybdenum or tungsten
B01J 29/44
Containing iron group metals, noble metals or copper: noble metals
B01J 29/46
Containing iron group metals, noble metals or copper: iron group metals or copper