Claims
- 1. A porous lithium aluminate carrier for catalyst which comprises a spinel structure having a mean pore diameter in the range of 40 to 1,000 angstroms and a total pore volume in the range of 0.2 to 1.5 mL/g, and which comprises as metal elements, lithium, aluminum and a divalent metal under the conditions that an atomic ratio of lithium/aluminum ranges from 0.2/5.0 to 1.5/5.0 and an atomic ratio of the divalent metal/aluminum is less than 2.0/5.0.
- 2. The porous lithium aluminate carrier of claim 1, wherein the atomic ratio of lithium/aluminum ranges from 0.2/5.0 to 1.3/5.0 and the atomic ratio of the divalent metal/aluminum ranges from 0.1/5.0 to 2.0/5.0.
- 3. The porous lithium aluminate carrier of claim 1, wherein the divalent metal is selected from the group consisting of magnesium, zinc, cobalt, nickel and copper.
- 4. The porous lithium aluminate carrier of claim 1, which has a formula of Li.sub.x Me.sub.y Al.sub.5 O.sub.(15+x+2y)/2, wherein Me is a divalent metal, x is a number of 0.2 to 1.5, and y is a number of less than 2.0 under the condition that x+2y is a number of 0.5 to 5.0.
- 5. The porous lithium aluminate carrier of claim 1, which has a formula of Li.sub.x Me.sub.y Al.sub.5 O.sub.(15+x+2y)/2, wherein Me is a divalent metal, x is a number of 0.2 to 1.5, and y is a number of 0.1 to 2.0 under the condition that x+2y is a number of 0.5 to 4.0.
- 6. The porous lithium aluminate carrier of claim 1, which has a specific surface area of 30 to 300 m.sup.2 /g.
- 7. A catalyst composition which comprises a carrier of claim 1 and a catalyst component comprising a metal of platinum group or a compound of a metal of platinum group.
- 8. A process for preparing a lithium aluminate carrier of claim 1 which comprises the steps of immersing an alumina powder having a specific area of 30 to 300 m.sup.2 /g in an aqueous solution containing a lithium salt and a divalent metal salt, recovering the immersed alumina powder from the solution, drying the recovered alumina powder, and calcining the dried alumina powder at a temperature of 500.degree. to 1,000.degree. C.
- 9. A process for preparing a lithium aluminate carrier of claim 1 which comprises the steps of mixing an alumina sol and an aqueous solution containing a lithium salt and a divalent metal salt, drying the resulting mixture, and calcining the dried mixture at a temperature of 500.degree. to 1,000.degree. C.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-146835 |
May 1995 |
JPX |
|
7-184907 |
Jun 1995 |
JPX |
|
Parent Case Info
This is a division, of application Ser. No. 08/652,729, filed May 22, 1996, now U.S. Pat. No. 5,688,984.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
652729 |
May 1996 |
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