Ammonia solutions are considered to be effective solvents for carbon dioxide absorption. Despite numerous advantages of these solvents, their high volatility is a significant technical and economic problem. Therefore, in this work, silica particles were used as additives to improve CO ₂ absorption and inhibit NH ₃ desorption. SiO ₂ microparticles and colloidal SiO ₂ particles in the concentration range of 0-0.15 wt.% were used in this study. The most favorable mass transport for CO2 absorption was at the concentration of colloidal particles of 0.05 wt.%. Under these conditions, the enhancement in the number of moles of absorbed CO ₂ was above 30%. However, in solvents containing 0.01 wt.% SiO2 microparticles, the increase in CO ₂ absorption was about 20%. At the same time, the addition of SiO2 particles significantly reduced the escape of ammonia from the solution. The best improvement was obtained when colloidal SiO ₂ particles were added, and then NH ₃ escape was decreased by about 60%. This unfavorable phenomenon was also inhibited in ammonia solutions containing SiO2 microparticles at a concentration of 0.01 wt.%.