Claims
- 1. A process for producing a spherical catalyst carrier which consist of the steps of (a) adding a polysaccharide solution to an alumina-containing hydrate gel selected from alumina, silica-alumina, zirconia-alumina, or titania-alumina, (b) mixing said polysaccharide solution and said alumina-containing hydrate gel to form a slurry with a controlled concentration, (c) dropping the slurry into a solution containing multivalent metal ions, thereby forming spherical hydrogel, and (d) aging, washing, drying, and calcining said spherical hydrogel.
- 2. A process for producing a spherical catalyst carrier as defined in claim 1, wherein the polysaccharide solution used in step (a) is a 1.0-3.0 wt % solution of low-methoxyl pectin or sodium alginate.
- 3. A process for producing a spherical catalyst carrier as defined in claim 1, wherein the amount of said polysaccharide solution used in step (a) is 3-10 times the amount of the hydrate gel in terms of oxide (by weight).
- 4. A process for producing a spherical catalyst carrier as defined in claim 1, wherein the slurry used in step (b) contains 5-20 wt % of alumina, silica-alumina, zirconia-alumina, or titania-alumina in terms of oxide.
- 5. A process for producing a spherical catalyst carrier as defined in claim 1, wherein said solution of multivalent metal ions contains 0.5-3.0 wt % of at least one of calcium, aluminum, magnesium, barium, or strontium.
- 6. A process for producing a spherical catalyst carrier as defined in claim 1, wherein the spherical hydrogel is an alumina or silica-alumina hydrogel, and wherein in step (d) the spherical alumina or silica-alumina hydrogel is dried at 60-120° C. and calcined at 500-900° C.
- 7. A process for producing a spherical catalyst carrier as defined in claim 1, wherein the spherical hydrogel is a zirconia-alumina or titania-alumina hydrogel, and wherein in step (d) the spherical zirconia-alumina hydrogel or titania-alumina hydrogel is dried at 60-120° C. and calcined at 400-700° C.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-227962 |
Aug 1998 |
JP |
|
10-241804 |
Aug 1998 |
JP |
|
CROSS-REFERENCED TO RELATED APPLICATION
This application is a continuation of application Ser. No. 09/371,495, filed Aug. 10, 1999, now U.S. Pat. No. 6,251,823, the priority of which is hereby claimed.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4089941 |
Villemin |
May 1978 |
A |
4179408 |
Sanchez et al. |
Dec 1979 |
A |
6251823 |
Yamaguchi et al. |
Jun 2001 |
B1 |
Foreign Referenced Citations (1)
Number |
Date |
Country |
10-167724 |
Jun 1998 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/371495 |
Aug 1999 |
US |
Child |
09/828920 |
|
US |