How to improve the stability of MgO adsorbents?

Improving the stability of MgO adsorbents can be achieved through various methods,including

                    Improving the stability of MgO adsorbents can be achieved through various methods,including:

                    Adding stabilizers:By adding stabilizers such as CaCO3 to MgO based adsorbents,their adsorption cycle stability can be significantly improved.Research has shown that when the adsorbed gas contains 40%CO2 and the mass fraction of CaCO3 is 5%,the initial adsorption capacity of the adsorbent can reach 0.63g·g^-1.Even after 20 cycles,the adsorption capacity can still be maintained at 0.50g·g^-1.

                    Optimizing the preparation process:Choosing appropriate precursors and preparation methods is crucial for improving the stability of MgO adsorbents.For example,using basic magnesium carbonate and magnesium citrate as precursors,a mixture of CaCO3 prepared by urea hydrolysis deposition method,and impregnating with alkali metal salts,can prepare a series of modified MgO based adsorbents with different CaCO3 contents,thereby improving their stability.

                    Surface modification:Chemical modification of MgO surface,such as introducing nitrogen-containing functional groups,can improve its thermal and chemical stability.This method usually involves surface chemical reactions,which can effectively prevent the sintering phenomenon of MgO at high temperatures.

                    Structural design:By designing special microstructures,such as porous or core-shell structures,the thermal stability and compressive strength of MgO can be improved,thereby maintaining good performance in multiple adsorption/desorption cycles.

                    Doping with other metal oxides:Combining MgO with other metal oxides such as Al2O3 can improve its thermal stability and dispersibility,thereby enhancing the overall adsorption stability.

                    Control operating conditions:During the adsorption process,controlling operating conditions such as temperature,pressure,and gas flow rate can reduce the thermal and chemical degradation of MgO,and extend its service life.

                    Regeneration treatment:Proper regeneration treatment,such as heat treatment or chemical treatment,can be carried out on the used MgO adsorbent to restore its active sites and improve its stability when reused.

                    Theoretical and experimental combination:Combining theoretical research and experimental verification,continuously optimizing the composition and structure of MgO adsorbents to achieve the best stability effect.

                    Overall,the comprehensive application of the above methods can effectively improve the stability of MgO adsorbents,making them more reliable and efficient in practical applications.