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Use of Layer Dichalcogenides as Filters for Heavy Metals

IP.com Disclosure Number: IPCOM000080196D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Figat, RA: AUTHOR [+2]

Abstract

There is described herein a technique for overcoming the pollution problem caused by the occurrence of heavy metals in exhaust and stack gases.

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This is the abbreviated version, containing approximately 100% of the total text.

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Use of Layer Dichalcogenides as Filters for Heavy Metals

There is described herein a technique for overcoming the pollution problem caused by the occurrence of heavy metals in exhaust and stack gases.

The technique entails the use of transition metal dichalcogenides such as, for example, TaS(2), TaS, NbS(2), TiS(2), and the like, as filters for removing heavy metals from exhaust and stack gases, examples of such heavy metals being Pb, Hg, Cd, Tl, etc.

In carrying out this technique, finely divided powders of the dichalcogenides are heated to a temperature of several hundred degrees. At such temperature, they readily and efficiently intercalate the heavy metals between their layers. For example, it has been found that a mole of NbS(2) is capable of removing up to 200 grams of Pb.

Reactive fine powders of the dichalcogenides mentioned hereinabove can be prepared by the reaction of the metal halides, e.g., TiCl(4), TaCl(5), with H(2)S at relatively low temperatures. The produced dichalcogenides material is then employed as a primary constitutent of a filter, through which a stack or exhaust gas can flow.

An example wherein such a filter can be advantageously employed is on the exhaust system of an automobile, where the exhaust gases heat the dichalcogenides to a suggiciently high temperature to cause intercalation.

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