中文摘要：

以沉积-沉淀法制备的MnOx-CoOy/TiO2（MCT）为吸附剂,在固定床实验台架上研究了制备过程中煅烧温度（200-800℃）对MCT脱除单质汞（Hg0）的影响;采用N2吸附/脱附、扫描电子显微镜（SEM）、X射线衍射（XRD）、H2-程序升温还原（TPR）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）等手段表征了吸附剂的理化特征。研究表明,MCT吸附剂的脱汞效率与煅烧温度密切相关,400℃煅烧时,吸附剂的脱汞效率最高。吸附剂的煅烧过程包含吸附态水的蒸发、锰钴碳酸盐或氢氧化物的分解、MnOx和CoOy的形成及MnOx、CoOy和TiO2晶相的转变。随着煅烧温度的增加,MCT吸附剂的比表面积和总孔容积逐渐减小,平均孔径逐渐变大,且吸附剂发生团聚,颗粒尺寸增大;MnO2和Co3O4向Mn2O3和CoO的转变,吸附态氧含量的降低,致使吸附剂的脱汞活性下降。

英文摘要：

The influence of calcination temperature （200-800 ℃） on the structure and activity of MnOx-CoOy/TiO2 （MCT） adsorbents prepared by a deposition-precipitation method was investigated by using an elemental mercury （Hg0） removal experimental setup. A variety of techniques were used such as N2 adsorption/desorption, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, H2-temperature programmed reduction （TPR）, Fourier transform infra-red spectroscopy （FTIR）, and X-ray photoelectron spectroscopy （XPS）. The results exhibit that the Hg0 removal efficiency of MCT adsorbent is closely related to the calcination temperature The Hg 0removal activity firstly increases below 400 ℃ and then decreases with the increase of calcination temperature. The calcination temperature process may include several successive structure changes such as the evaporation of water, decomposition of manganese and cobalt compounds （such as carbonate and hydroxide）, formation of crystallization of MnOx and CoOy, and the crystal phase transformation of MnOx, CoOy and TiO2. With the calcination temperature increase, the surface area and pore volume gradually decline. Some agglomerations of MCT occur at higher calcination temperature, resulting in the increases of average pore diameter and the particle size. Meanwhile, the oxidation states of manganese and cobalt would convert from MnO2 and CO304 to Mn2O3 and CoO, and the surface chemisorbed oxygen decreases due to the removal of surface chemisorbed oxygen, leading to the decrease of Hg0 removal.