Adsorption of As4O6 from flue gas by zeolites: Influence of pore structure and Al substitution

作者：Du, Xuesen^*; Tang, Jiyun; Chen, Yanrong; Yang, Xin; Ran, Jingyu; Zhang, Li

来源：Microporous and Mesoporous Materials, 2017, 243: 22-27.

DOI：10.1016/j.micromeso.2017.02.026

• As4O6 adsorption
• Zeolite
• Pore size
• Si/Al ratio
• Competitive adsorption

Efficient storage of arsenic is very important to its capture in the flue gas of power plants. In this study, Grand Canonical Monte Carlo method and Density Functional Theory were used to study the adsorption of arsenic in zeolites with various Si/AI ratios and pore sizes. The results show that pores with diameter of 7 A are optimal for As4O6 adsorption in zeolites. High porosity can also promote the adsorption of As4O6 in a specific amount of zeolite. Al substitutions are beneficial for As4O6 adsorption. Experiments were used to test the adsorption of As4O6 using H-ZSM-5 zeolites with different Si/Al ratios. The results show the same trend with the theoretical study. The influences of possible compositions in flue gas including SO2, NO, H2O, CO2 and N-2 were also tested using Grand Canonical Monte Carlo method. SO2 and NO can cause notable drop of As4O6 adsorption.

• 出版日期2017-5-1
• 单位重庆大学