Rapid preparation of binder‐free CO 2 ‐capture UTSA ‐16(Zn) microspheres by oscillatory flow crystallizer and spray dryer

An integrated process combining an oscillatory flow reactor (OFR) and a spray dryer was developed for the rapid preparation of binder‐free UTSA‐16(Zn) microspheres. UTSA‐16(Zn) powders with a median diameter of 3.74 μm were first synthesized in only 15 min using the OFR. After the as‐synthesized UTSA‐16(Zn) powders were redispersed in water, the nano‐suspension was directly fed into the spray dryer to produce microspheres with a recovery yield of 71.4%. The mesoporous binder‐free microspheres, with a median diameter of 54.51 μm, preserved the crystalline structure of UTSA‐16(Zn) and exhibited nearly zero cohesion. The microspheres had a BET specific surface area of 562.0 m 2 /g and a CO 2 uptake of 2.97 mmol/g at 30°C and 1 bar. After 100 temperature swing adsorption cycles, the CO 2 adsorption capacity decreased by only approximately 1%.