A filter for removing contaminants from a gas contains a support material and, deposited on the support material, a first component which is an oxide, a hydroxide or a mixture of an oxide and hydroxide of Al, Si, Ti, Fe or Zn, containing at least about 0.5% by weight of water. The first component is
A filter for removing contaminants from a gas contains a support material and, deposited on the support material, a first component which is an oxide, a hydroxide or a mixture of an oxide and hydroxide of Al, Si, Ti, Fe or Zn, containing at least about 0.5% by weight of water. The first component is deposited onto the filter preferably from a colloidal sol solution of a compound of the metal of that component. The first component acts as an adsorbent to remove contaminants from a gas, such as air. The filter may contain a second component, such as an alkali metal, alkaline earth metal, permanganate(s), or a mixture thereof. The filter may also contain a third component, such as an adsorbent, in the form of separate particles, e.g., activated charcoal, potassium permanganate, activated alumina, optionally treated with an alkali metal or alkaline earth metal compound(s), zeolites, and alumino-silicate compositions. The filter is preferably used to remove contaminants from the air in central forced air systems in residential and commercial construction.
대표청구항▼
A filter for removing contaminants from a gas comprising a support material and, deposited on the support material: (i) a first component which is an oxide, a hydroxide or a mixture of an oxide an a hydroxide of Al, Si, Ti, Fe, Zn or a mixture thereof, the oxide, the hydroxide or the mixture of the
A filter for removing contaminants from a gas comprising a support material and, deposited on the support material: (i) a first component which is an oxide, a hydroxide or a mixture of an oxide an a hydroxide of Al, Si, Ti, Fe, Zn or a mixture thereof, the oxide, the hydroxide or the mixture of the oxide and the hydroxide comprising at least about 0.5% by weight of water; and, (ii) a second component which is an alkali metal, an alkaline earth metal, a compound of the alkali metal, a compound of the alkaline earth metal, a salt of permanganic acid, or a mixture thereof. A filter of claim 1 wherein the support material is a fibrous support material. A filter of claim 1 which additionally comprises a third component which is an adsorbent in the form of separate particles. A filter of claim 8 wherein the third component comprises granular particles of alumina, granular particles of alumina treated with at least one alkali metal and/or alkaline earth metal compound, activated charcoal, alumino-silicate, clay, a molecular sieve, a zeolite, a bauxite compound, a separately prepared and separately supported salt of permanganic acid or a mixture thereof.
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