Abstract
An efficient and low-cost adsorbent material is necessary for separating carbon monoxide (CO) from off-gases that also contain CO2 and N2. Boehmite (γ-AlOOH)-based materials have shown great potential for many applications. In this work, mesoporous γ-AlOOH microspheres were rapidly produced by combining the sol–gel and continuous flow-assisted spray-drying methods (SD-AlOOH). Then, Cu(I) chloride (CuCl) was thermally dispersed into the SD-AlOOH microspheres to obtain the CuCl@SD-AlOOH adsorbent. Gas adsorption experiments revealed that the CuCl@SD-AlOOH samples adsorbed CO over CO2 and N2 owing to the π-complexation reaction between CO and Cu(I). The adsorption properties were affected by the spray-drying conditions, CuCl load, and CuCl dispersion temperature. The optimal SD-AlOOH, which was loaded with 33 wt% CuCl, exhibited a CO adsorption capacity of ∼38.7 cm3 g−1 (25 °C and 100 kPa), which exceeds that of commercial CuCl-loaded AlOOH and many other Cu(I) π-complexation adsorbents. Furthermore, the prepared CuCl@SD-AlOOH showed high ideal adsorbed solution theory (IAST)-predicted CO/CO2 and CO/N2 selectivities of ∼87 and ∼730, respectively, at 100 kPa. Breakthrough tests showed that the CuCl-loaded SD-AlOOH microspheres effectively separated CO from a gas mixture with CO2 under dynamic flow conditions.
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