Patent ID: 8221718

Claim:
A method of making an adsorbent, the method comprising: providing a zeolite material having Si/Al<10; replacing at least 80% of exchangeable cations in the zeolite with Ag + ; washing the exchanged zeolite sufficiently to eliminate excess Ag, Ag compounds and/or salts of impurities or other exchangeable cations from the pores of the zeolite; and thermally treating and activating the exchanged zeolite such that the exchanged zeolite achieves a final moisture level in the zeolite of no more than 2.0 wt % and hydrothermal structural damage of no greater than 15%, wherein the zeolite has a ΔCO working capacity of at least 0.045 mmol CO/g Ag-zeolite, the ΔCO working capacity determined from a reference breakthrough test.