Inorganic supports for bioremediation
AssigneeW. R. Grace & Co.-Conn.
InventorsJames G. Miller, Michael J. Wax, Richard F. Wormsbecher
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Abstract
Porous bodies are produced which are suitable for use as supports for catalysts, including living cells, such as bacteria. The bodies have a significantly large average pore diameter of about 0.5 to 100 microns, (i.e. 5,000 to 1,000,000 .ANG.) and a total pore volume of about 0.1 to 1.5 cc/g with the large pores contributing a pore volume of from about 0.1 to 1.0 cc/g. The bodies are made by preparing a mixture of ultimate particles of bound clay, one or more optional ingredients such as inorganic binders, extrusion or forming aids, burnout agents, or a forming liquid, such as water. In a preferred embodiment, the ultimate particles are formed by spray drying.
Claims37
A macroporous inorganic oxide catalyst support comprising a plurality of inorganic oxide particles having a particle size of 1 to 1000 microns and an inorganic binder which binds said inorganic oxide particles together in a manner such that macropores are formed throughout the catalyst support, said catalyst support having a total pore volume of 0.1 to 1.5 cc/g;
- macropores with pore diameters as measured by mercury porosimetry of from about 0.5 to 100 microns, said macropores providing a pore volume of from 0.1 to 1.0 cc/g;
- and a crush resistance of greater than 5 pounds when measured on supports having a minimum dimension of 3 mm.
A method of preparing a macroporous, inorganic oxide catalyst support comprising:
- i) preparing a mixture comprising a plurality of inorganic oxide particles having a particle size of 1 to 1000 microns and an inorganic binder capable of binding said inorganic oxide particles;
- ii) forming the mixture into a desired shape to form a catalyst support having a minimum dimension of about 250 .mu.m;
- macropores having a diameter in the range of 0.5 to 100 .mu.m distributed throughout and providing a pore volume of from 0.1 to 1.0 cc/g;
- a pore volume of 0.1 to 1.5 cc/g;
- and a crush strength of at least 5 pounds when measured on supports having a minimum dimension of 3 mm.
Dependencies are inferred from the claim text.