Air filtration media comprising metal-doped silicon-based...

Details Air filtration media comprising metal-doped silicon-based... Air filtration media comprising metal-doped silicon-based...

2008-05-27

2008-05-27

Lawrence, Frank M. (Department: 1797)

Gas separation: apparatus

Solid sorbent apparatus

Dispersed or impregnated solid sorbent bed

C423S338000

Reexamination Certificate

active

11156511

ABSTRACT:
The present invention relates generally to an environmental control unit for use in air handling systems that provides highly effective filtration of noxious gases (such as ammonia). Such a filtration system utilizes novel metal-doped silica-based gels to trap and remove such undesirable gases from an enclosed environment. Such gels exhibit specific porosity requirements and density measurements. Furthermore, in order for proper metal doping to take effect, such gels must be treated while in a wet state. The combination of these particular properties and metal dopant permits highly effective noxious gas filtration such that uptake and breakthrough results are attained, particularly in comparison with prior silica gel filtration products. Methods of using and specific filter apparatuses are also encompassed within this invention.

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Wason, Satish K., “Silica Gels”, Pigment Handbook: vol. 1, pp. 175-181, 1988, John Wiley & Sons, Inc.

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