标题：Effect of acid treatment of lignite semi-coke on its surface properties and mercury removal performance
作者：Wang, Li ;Liu, Xiu-Li ;Zhang, Lin-Lin ;Li, Min ;Zhang, Hua-Wei
作者机构：[Wang, Li ;Liu, Xiu-Li ;Zhang, Lin-Lin ;Li, Min ;Zhang, Hua-Wei ] College of Chemical and Environmental Engineering, Shandong University of Science an 更多
来源：Gongneng Cailiao/Journal of Functional Materials
摘要：The mercury removal performance of lignite semi-coke modified with concentration of 25% HNO3 or 25% H2SO4 solution has been investigated in a fixed bed adsorption apparatus with nitrogen as a carrier gas to carry mercury vapor, and the influence factors for mercury removal were also analysied. The surface physical and chemical properties of semi-coke modified by sulfuric acid (S-SC) and semi-coke modified by nitric acid (N-SC) were characterized by methods of acid-base titration, boehm tirast, brunauer-emmett-teller (BET) measurements, X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results show that the oxidation of nitric acid or sulfuric acid results in the decrease in ash content of semi-coke and the increase in content of oxygen, nitrogen and the sulfonic acid groups of modified semi-cokes. Compared with lignite semi-coke (NM-SC), the N-SC sample can improve mercury removal efficiency from flue gas at temperature of 30 and 140°C, while the S-SC sample only enhance the mercury removal efficiency at 140°C, these results are related to the surface properties of semi-coke modified by acid and its content of acidic functional groups.