Abstract: A new selective desulfurizer LY 1, sterically hindered amine, was prepared which had more excellent selectivity for H 2S in the presence of CO 2 in raw gas, and better absorption and desorption capacities than MDEA. The influence of activated carbon, Fe(OH) 3 and FeS particles in desulfurizer solutions on foaming and foam stability was studied by using LY 1, MDEA,DEA and MEA solution. The foaming property of these desulfurizer solution, especially the MDEA solution was remarkably affected by activated carbon and Fe(OH) 3 particles. The size of solid particles has little effect on the forming property of desulfurizer solution. However the concentration of solide particles has superior influence.