A high concentration CO,2,（50%, volume fraction） tail gas treatment scenario in a petrochemical emission process was simulated. The primary and tertiary amine solutions were compounded to establish blended amine titanium-based nanofluid with both fast reaction performance and high absorption capacity. By self-designed and built 10 t/a scale packed tower CO,2, absorption-desorption cycle experimental system, the comprehensive enhanced mechanism of CO,2, absorption-desorption by nanofluid absorbent in packed tower was investigated. It is found that the nanofluid absorbent could increase the capacity of the absorption-desorption cycle by up to 40% compared to blended amines. Increasing the CO,2, loading in the lean liquid will weaken the contribution of nanoparticles to the CO,2, capture performance of the absorbent. When the CO,2, loading reached 0.4 mol/mol（1 mol amine loaded with 0.4 mol CO,2,）, the volumetric overall mass transfer coefficient of the nanofluid absorbent is essentially the same as that of the blended amine absorbent.The enhanced interaction between nanoparticles in the system leads to the formation of micro-convection within the liquid phase, which can enhance the CO,2, absorption performance of the capture system. However, when the nanoparticle mass concentration exceeds 0.12%,the micro convection and solid shuttle effects in the liquid phase are weakened by particle agglomeration. Therefore, effective measures are needed to disperse the agglomerated nanoparticles during the circulation process. How to enhance the stability of nanoparticle dispersion by coupling external perturbation and internal chemical dispersion will be one of the key directions for subsequent research.