碱金属改性对FAU型分子筛脱除高炉煤气中H2S性能的影响OA

H2S in blast furnace gas needs to be deeply removed to meet the ultra-low emis-sion requirement of combustion flue gas.FAU zeolite desulfurization has become a hot topic because of its simple operation and recyclability.The desulfurization performance of FAU zeolite sorbent is closely related to its basic site.However,the correlation between the type of basic site and the desul-furization performance of H2S needs further investigation.Based on this,NaFAU zeolite was used,and it was modified by ion exchange with K and Li,and a series of sorbents with different numbers and strength of basic sites were prepared.Then,the H2S removal performance in simulated blast fur-nace gas was investigated by using a fixed bed.XRD,XRF,N2 adsorption-desorption and CO2-TPD were used to analyze the physicochemical properties of the sorbents,the influence of alkali metal types on desulfurization performance was discussed,and the relationship between the different strengths of basic sites and desulfurization performance was investigated.The results show that K+modification can increase the number of basic sites of NaFAU zeolite sorbent,thereby enhancing H2S removal per-formance,whereas Li+modification can decrease the number of basic sites,resulting in a decrease in the removal performance of NaFAU zeolite sorbent.When the K+concentration increases from 0.05 mol/L to 1.0 mol/L,the surface basic sites of the sorbents increase first and then decrease,and the desulfurization performance enhances first and then weakons.There is a linear positive correlation between the number of weakly basic sites and the desulfurization performance.