# US 4,399,047 A · Composition for use in a magnetically fluidized bed

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- Number: US 4,399,047 A
- Document ID: US4399047A
- Status: Granted
- Kind: A
- Application number: 06/421,040
- Filed: 1982-09-22
- Granted: 1983-08-16
- Earliest claimed: 1978-09-18
- Assignees: Exxon Research & Engineering Co.
- Inventors: Robert L. Seiver; Martin O. Gernand
- Web page: https://patentgrep.com/patent/US4399047A

## CPC

- B01J 23/745: Iron
- B01J 35/54: Bars or plates
- Y10S 428/90: Magnetic feature
- Y10T 428/2993: Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composition which exhibits high induced magnetism in a small applied magnetic field when formed into a magnetically stabilized fluidized bed and which comprises particles containing a nonferromagnetic component, or components, composited with a plurality of elongated ferromagnetic components, randomly oriented and present in each of said particles in relatively low concentration, based on the total volume of the particles; a process for formation of said compositions and a process wherein such composite particles are formed into a magnetically stabilized fluidized bed and contacted with a fluid, preferably gas.

## Claims

### Claim 1

As a composition of matter, particulate material which can be formed into a magnetically stabilized fluidized bed to provide high magnetization at a low applied field which comprises particles of average size ranging from about 10 .mu.m to about 4,000 .mu.m containing a non-ferromagnetic refractory, porous inorganic oxide component composited with a plurality of elongated ferromagnetic components, each ferromagnetic component being multidomain, having dimensions of at least 1 .mu.m in all directions, elongated in two directions, and having a length:dimaeter (L/D) ratio of at least 2 and not more than 313, said ferromagnetic components being present in the composite particles as inclusions within said non-ferromagnetic refractory porous inorganic oxide component, and randomly oriented and constituting at least 0.5%, but not more than .pi./2(L/D+1), of the total volume of each particle, where L/D is the average ratio of the longest dimension of the ferromagnetic components relative to the shortest dimension, wherein a catalytically effective amount of a catalytically active metal is dispersed on the surface of the composite particles, and the composite particles are catalytically active.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the volume of the elongate ferromagnetic components contained in the composite constitutes at least 5%. but not more than 52.4 percent of the total volume of each particle.

### Claim 3 (depends on 2)

The composition of claim 2 wherein the length:diameter ratio of the ferromagnetic components range no higher than about 30.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the porous inorganic oxide component is alumina.

### Claim 5 (depends on 1)

The composition of claim 1 wherein the porous inorganic oxide component is alumina, and the volume of the ferromagnetic components contained in the composite constitutes at least 5%, but not more than 52.4 percent of the total volume of each particle.

### Claim 6 (depends on 5)

The composition of claim 5 wherein the length:diameter ratio of the ferromagnetic components ranges no higher than about 30.