Fe₃O₄ nanoparticle has been developed as an effective mass transfer promotor for CO₂ absorption into aqueous ammonia solutions. The overall volumetric mass transfer coefficients (K_G^CO2A) were determined for various nanoparticle loadings, nanoparticle sizes, ammonia concentrations, inlet CO₂ concentrations and gas flow rates in a bubbling reactor. Results showed that K_G^CO2A increased with the increase of nanoparticle loadings up to a maximum value and then decreased. With 0.3 g/l nanoparticles, the value of K_G^CO2A for an ammonia concentration of 4 wt % reached 5.6 × 10⁻⁵ mol /(m³ s Pa), 14.5 % higher than that achieved without nanoparticles. Results also showed that K_G^CO2A had upward trend with the increasing of ammonia concentration, downward trend with the increasing of CO₂ inlet concentration, and first increased and then decreased with the increasing of gas flow rate. The mass transfer enhancement by Fe₃O₄ nanoparticles was mainly attributable to coalescence inhibition as well as micro-convection induced by the Brownian motion.

已经开发出Fe ₃ O ₄纳米颗粒作为将CO ₂吸收到氨水溶液中的有效的传质促进剂。对于鼓泡反应器中的各种纳米颗粒负载，纳米颗粒大小，氨气浓度，进口CO ₂浓度和气体流速，确定了总的体积传质系数（K _G ^CO2 A）。结果表明，K _G ^CO2 A随着纳米颗粒负载量的增加而增加，直至最大值，然后下降。使用0.3 g / l的纳米颗粒，K _G ^CO2 A的值氨浓度为4 wt％时达到5.6×10 ^-5 mol /（m ³ s Pa），比没有纳米颗粒时高14.5％。结果还表明，随着氨气浓度的增加，K _G ^CO2 A呈上升趋势，随着CO ₂入口浓度的增加呈下降趋势，然后随着气体流量的增加先上升后下降。Fe ₃ O ₄纳米粒子的传质增强主要归因于凝聚抑制以及布朗运动引起的微对流。