燃料化学学报2016，Vol.44Issue(4)：394-400,7.
Mn/Ce掺杂改性半焦对模拟煤气中单质汞的脱除性能研究
Removal of vapor-phase elemental mercury from simulated syngas using semi-coke modified by Mn/Ce doping
摘要
Abstract
The Mn-SC and Mn/Ce-SC adsorbents were prepared by modification of semi-coke ( SC ) with manganese nitrate and cerium nitrate, and their mercury removal performance in simulated syngas was investigated in a lab-scale fix-bed reactor. Effect of cerium and manganese on the surface physical and chemical properties of semi-coke was characterized by Brunauer-Emmett-Teller ( BET ) , X-ray diffraction ( XRD ) , and X-ray photoelectron spectroscopy ( XPS) . The results show that BET surface area, average pore size and total pore volume of Mn-SC are higher than those of SC, while Mn/Ce doping modification has adverse effect on the pore structure;MnxOy and CexOy exist in highly dispersive amorphous form on the surface of semi-coke. The mercury removal efficiency of Mn/Ce-SC is higher than that of Mn-SC and SC, and decreases with increase in adsorption temperature. Generally, the Mn/Ce-SC exhibits good mercury removal performance at elevated temperatures. With the presence of 1% of O2 , oxidation and reduction reaction cycle could occur on the surface of Mn/Ce-SC, and oxygen in syngas is converted into lattice oxygen with high oxidation activity. Based on the Mars-Maessen mechanism, Hg0 could be oxidized to Hg2+ by lattice oxygen and then adsorbed. The mercury removal efficiency of Mn/Ce-SC maintains over 95% at 260℃.关键词
Mn/Ce掺杂/改性半焦/脱汞机理/煤气Key words
Mn/Ce doping/modified semi-coke/mercury removal mechanism/syngas分类
化学化工引用本文复制引用
张华伟,陈江艳,赵可,牛庆欣,王力..Mn/Ce掺杂改性半焦对模拟煤气中单质汞的脱除性能研究[J].燃料化学学报,2016,44(4):394-400,7.基金项目
The project was supported by the National Natural Science Foundation of China (51406107,21276146) and Graduate Student Innovation Fund of Shandong University of Science and Technology (YC150110).@@@@国家自然科学基金(51406107,21276146)和山东科技大学研究生科技创新基金(YC150110)项目资助 （51406107,21276146）
