中国电机工程学报Issue(15)：3865-3871,7.DOI:10.13334/j.0258-8013.pcsee.2015.15.015
煅烧温度对MnOx-CoOy/TiO2吸附剂结构及脱汞活性的影响
Influence of Calcination Temperature on the Structure and Activity of MnOx-CoOy/TiO2 Adsorbent for Hg0 Removal
摘要
Abstract
ABSTRACT: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 Hg0 removal 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 Co3O4 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.关键词
煅烧温度/MnOx-CoOy/TiO2/吸附剂/脱汞Key words
calcination temperature/MnOx-CoOy/TiO2/adsorbent/mercury removal分类
资源环境引用本文复制引用
张安超,支光辉,张志会,孙路石,刘志超,向军..煅烧温度对MnOx-CoOy/TiO2吸附剂结构及脱汞活性的影响[J].中国电机工程学报,2015,(15):3865-3871,7.基金项目
国家自然科学基金项目(51306046，51376073，21176098)；河南理工大学青年骨干教师项目(YBT2013004)。Project Supported by the National Science Foundation of China (51306046,51376073,21176098) （51306046，51376073，21176098）
The Youth Backbone Teacher Project of Henan Polytechnic University (YBT2013004) （YBT2013004）
