The invention discloses an adsorbent capable of simultaneously adsorbing and removing SO2,
NOx and CO2 from
coal-fired
flue gas, and a preparation method and use thereof. In the preparation of the adsorbent,
faujasite (X type and Y type), LTA (lipoteichoicacid) type
zeolite,
mordenite or a ZSM-5 (
zeolite molecular sieve)
molecular sieve is used as an adsorption carrier, and the carrier is put in solutions, such as a
lithium chloride solution, a
potassium chloride solution and the like for
ion exchange; then, the carrier is cleaned and dried; and finally, the carrier is put in a
muffle furnace for
roasting so as to prepare the required adsorbent. In the use of the adsorbent, the adsorbent is applied to removing the SO2, the
NOx and the CO2 from the
coal-fired
flue gas so as to reach the aim of purifying the
flue gas. With the adoption of the adsorbent disclosed by the invention, the simultaneous removal of a plurality of pollutants from flue gases is realized, the adsorption efficiency is high, and the operation is simple; and the preparation method of the adsorbent is mature and stable, convenient and simple, and easy to realize.