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US 5,334,790 AGranted
Process and catalyst for partially hydrogenating aromatics to produce cycloolefins
AssigneeCatalytica, Inc.
InventorsMichael A. Richard, Jacques De Deken, David K. Yee
Life of this patent
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Abstract
This is a catalyst and a process for partially hydrogenating polycyclic and monocyclic aromatic hydrocarbons such as benzene, naphthalenes, biphenyls, and alkylbenzenes to produce the corresponding cycloolefins. The catalyst is a hydrogenation catalyst comprising ruthenium on a composite support. It is a process in which the product cycloolefin is produced in high yield and with high selectivity.
Claims31
A process for producing cycloolefins from aromatic feedstocks comprising the steps of:
- contacting hydrogen, an aqueous solution which contains a promoter selected from the group consisting of a Group VIII, IB, and IIB metal salt, and the aromatic feedstock comprising one or more monocyclic or polycyclic aromatic hydrocarbons with a partial hydrogenation catalyst to hydrogenate partially the aromatic feedstock and produce the corresponding cycloolefin, wherein the hydrogenation catalyst is comprised of ruthenium and a composite catalyst support made up of a core of a first oxidic material having a surface area greater than about 50 m.sup.2 /gm which is at least partially surrounded by a second oxidic material having a surface area less than about 10 m.sup.2 /gm, wherein the composite support has a BET surface area of at least 50 m.sup.2 /gm, the ruthenium exists as particles no more than about 25 .ANG. in average diameter, and the second oxidic material is selected from the group consisting of metal oxides, semimetal oxides, and a lanthanum-containing material of the formula:
- x(LaONO.sub.3)+y(La.sub.2 O.sub.3)+z(La(NO.sub.3).sub.3)
- where x<1, z<1, and x+y+z=1;
- and
- separating the cycloolefin from the hydrogenation catalyst.
2 more elements
A process for producing cycloolefins from aromatic feedstocks comprising the steps of:
- contacting hydrogen, an aqueous solution which contains a promoter selected from the group consisting of a Group VIII, IB, and IIB metal salt, and the aromatic feedstock with a partial hydrogenation catalyst to partially hydrogenate the aromatic feedstock and produce the corresponding cycloolefin, wherein the hydrogenation catalyst is comprised of no more than about 20% by weight of ruthenium and a composite catalyst support made up of a core of a first oxidic material having a surface area greater than about 50 m.sup.2 /gm which is at least partially surrounded by a second oxidic material having a surface area less than about 10 m.sup.2 /gm, wherein the composite support has a BET surface area of at least 50 m.sup.2 /gm, the ruthenium exists as particles no more than about 25 .ANG. in average diameter, and the second oxidic material is a lanthanum-containing material of the formula:
- x(LaONO.sub.3)+y(La.sub.2 O.sub.3)+z(La(NO.sub.3).sub.3)
- where x<1, z<1, and x+y+z=1;
- and
- separating the cycloolefin from the hydrogenation catalyst.
2 more elements
Dependencies are inferred from the claim text.