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US 5,512,530 AGranted
Catalyst carrier
AssigneeNorton Chemical Process Products Corporation
InventorsWilliam H. Gerdes, Donald J. Remus, Thomas Szymanski
Life of this patent
Estimating the term…
Abstract
A catalyst carrier that is comprised of relatively large alpha alumina particles dispersed in matrix that comprises an alpha alumina formed in situ by a sol-gel process and titania has excellent crush resistance while retaining good porosity and catalytic performance.
Claims9
A process for the production of a catalyst carrier which comprises:
- i) forming a mixture comprising:
- a. at least one alpha alumina component with an median particle size of from 3 to about 8 microns and:
- b. a seeded, hydrated precursor of alpha alumina in an amount sufficient to provide from about 5 to about 60% by weight of the total weight of alpha alumina in the catalyst carrier product;
- c. from about 5 to about 40%, based on the weight of the alpha alumina, of a burnout material;
- d. a titanium compound in an amount, calculated as titania, of from about 0.55 to about 1.0% based on the weight of the alpha alumina;
- and
- e. water in sufficient quantity to extrude the above mixture;
- ii) extruding the mixture into the desired shapes;
- and
- iii) firing to convert all the precursor alumina to alpha alumina so as to produce a catalyst carrier in which alpha alumina particles with a median particle size of from about 3 to about 8 microns are dispersed in a matrix of alpha alumina derived from the seeded precursor material and titania.
7 more elements
A process for the production of a catalyst carrier which comprises:
- i) forming a mixture comprising:
- a. an alpha alumina having a first component with a median particle size of from about 2 to about 4 microns and a second component with a median particle size of about 4 to about 8 microns;
- b. a seeded, hydrated precursor of alpha alumina in an amount sufficient to provide from about 5 to about 60% by weight of the total weight of alpha alumina in the catalyst carrier product
- c. from about 5 to about 40%, based on the weight of the alpha alumina, of a burnout material;
- d. from about 0.4 to about 3% based on the weight of alumina in the composition expressed as alpha alumina, of a ceramic bond material comprising less than about 1% of titania;
- e. from about 0.55 to about 1.0% by weight, based on the total alumina weight in the mixture expressed as alpha alumina, of titania;
- and
- f. water in sufficient quantity to extrude the above mixture;
- ii) extruding the mixture into the desired shape;
- and
- iii) firing to convert all the transition alumina to alpha alumina so as to produce a catalyst carrier in which alpha alumina particles with a median particle size of from about 3 to about 8 microns are dispersed in a matrix of alpha alumina derived from the seeded precursor material and titania.
8 more elements
Dependencies are inferred from the claim text.