Method of removing NOx by adsorption, NOx adsorbent and apparatu

Details Method of removing NOx by adsorption, NOx adsorbent and apparatu Method of removing NOx by adsorption, NOx adsorbent and apparatu

1991-04-22

1992-10-27

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 34, 55 74, 55 75, 55 78, 55181, 55387, 55389, 55390, 55524, 423239, B01D 5308

Patent

active

051585820

ABSTRACT:
The invention provides a method of removing NOx by adsorption wherein a gas containing NOx at a low concentration is brought into contact with an adsorbent comprising a copper salt supported on zeolite serving as a carrier, whereby the NOx is adsorbed and removed efficiently. The adsorbent for use in this method comprises at least one copper salt supported on natural or synthetic zeolite, the copper salt being selected from the group consisting of copper chloride, double salt of copper chloride and ammine complex salt of copper chloride. The apparatus of the invention for purifying an NOx-containing gas comprises an adsorptive dehumidifier for dehumidifying the gas with a dehumidifying agent and regenerating the agent with a purified gas, and an adsorptive denitration unit for denitrating the dehumidified gas. The denitration unit has an adsorbent regenerating zone provided with a channel for recycling an NH.sub.3 -containing regenerating gas and with a channel for withdrawing a portion of the regenerating gas from the recycling channel, passing the withdrawn gas through a denitration reactor and then releasing the denitrated gas into the atmosphere.

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