Claims
- 1. A molded article based on pyrogenically prepared aluminum oxide and having the following physical-chemical characteristic data:
- ______________________________________External diameter: 2 to 15 mmBET surface area: 60 to 115 m.sup.2 /gTotal Pore volume: 0.30 to 0.80 ml/gCrushing strength: 100 to 300NPore size distribution: no pores < 5 nm in diameter, at least 80% of the pores in the range 10 to 40 nm in diameterComposition: 94% to 99% by weight of Al.sub.2 O.sub.3, remainder SiO.sub.2.______________________________________
- 2. A process for the production of a molded article based on pyrogenically prepared aluminum oxide and having the following physical-chemical characteristic data:
- ______________________________________External diameter: 2 to 15 mmBET surface area: 60 to 115 m.sup.2 /gTotal Pore volume: 0.30 to 0.80 ml/gCrushing strength: 100 to 300 N (newtons)Pore size distribution: no pores <5 nm in diameter, at least 80% of the pores in the range 10 to 40 nm in diameterComposition: 94% to 99% by weight of Al.sub.2 O.sub.3, remainder SiO.sub.2______________________________________
- which comprises homogenizing 50-90% by weight of pyrogenically prepared aluminum oxide with 0.1-10% by weight of kaolin, 0.1-10% by weight of graphite, 5-45% by weight of urea, and 0.1-10% by weight of wax, with addition of water, drying the mixture at a temperature of from 80.degree. to 120.degree. C. and comminuting it to form a powder, pressing the powder to form a molded article, and tempering the molded article by heating at a temperature of from 400.degree. to 1200.degree. C. for a period of 0.5 to 6 hours.
- 3. A catalyst support having the composition according to claim 1 and having the shape of a pellet, rod or ring.
- 4. A catalyst comprising the support defined in claim 3 having deposited thereon a catalytically active substance.
- 5. The process according to claim 2, which comprises homogenizing 60-85% by weight pyrogenically prepared aluminum oxide with 1-5% by weight of kaolin, 1-5% by weight of graphite, 8-40% by weight of urea, and 1-5% by weight of wax.
- 6. The process according to claim 2, which further comprises optionally adding sugar or starch or a mixture of the two of said mixture.
Priority Claims (1)
Number |
Date |
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Kind |
3803897 |
Feb 1988 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 308,124, filed on Feb. 9, 1989, now abandoned.
US Referenced Citations (4)
Continuations (1)
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Number |
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Parent |
308124 |
Feb 1989 |
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