摘要
采用共沉淀法制备不同SiO2掺杂量的TiO2-SiO2复合载体,采用浸渍法在这些复合载体上负载活性组分V2O5和MoO3,制备不同SiO2掺杂量的V-Mo/TiO2-SiO2催化剂(VMTS)。运用XRD,SEM,BET,H2-TPR等分析手段对催化剂的理化性能进行表征,结果表明:随着SiO2掺杂量的增加,VMTS催化剂的XRD图谱中不仅出现了SiO2衍射峰,而且出现了锐钛矿型TiO2的衍射峰,表明活性组分V2O5和MoO3含量相对较低,主要以非晶态或微晶态形式存在;掺杂SiO2的催化剂H2-TPR还原峰向低温方向移动,同时比表面积和孔体积增大,孔径减小;与其他催化剂相比,SiO2与TiO2的质量比为0.2∶1的催化剂VMTS-(0.2∶1)具有最佳的氧化还原能力。脱硝效率评价结果表明:VMTS-(0.2∶1)催化剂具有最佳的烟气脱硝效率;烟气中通入SO2时,VMTS催化剂烟气脱硝效率下降幅度均低于未掺杂SiO2的催化剂,VMTS-(0.2∶1)催化剂烟气脱硝效率下降幅度最小,说明掺杂SiO2有利于催化剂抗硫性能的提高。
The TiO2-SiO2 composite supports with different SiO2 doping amount were prepared by co-precipitation method,and then the active components V2O5 and MoO3 were loaded on these composite supports by impregnation method to prepare V-Mo/TiO2-SiO2 catalysts(VMTS).The physical and chemical properties of the catalysts were characterized by XRD,SEM,BET,H2-TPR techniques.The results showed that with the increase of SiO2 doping amount,the XRD spectra of the VMTS catalysts not only presented SiO2 diffraction peak,but also the diffraction peak of Anatase TiO2.The active components,V2O5 and MoO3,were in the form of amorphous or microcrystalline because of relatively low content.The reduction peak of SiO2-doped catalyst moved toward the low temperature direction in H2-TPR graph,the specific surface area and pore volume increased while the pore diameter decreased.Compared with the other catalysts,the VMTS-(0.2∶1)catalyst with the mass ratio of SiO2/TiO2 of 0.2 had the lowest reduction peak temperature and the largest reduction peak area as well as the best redox capacity.The results of denitration efficiency evaluation showed that VMTS-(0.2∶1)catalyst had the best denitration efficiency for the flue gas.When SO2 was introduced into the flue gas,the decrease range of denitration efficiency of V-Mo/TiO2-SiO2 catalyst was lower than that of the undoped catalyst and all other tested catalysts with SiO2 doped,indicating that doping SiO2 is beneficial to the improvement of sulfur resistance of the catalyst.
作者
王献忠
吴彦霞
陈鑫
陈琛
梁海龙
朱江
戴长友
唐婕
Wang Xianzhong;Wu Yanxia;Chen Xin;Chen Chen;Liang Hailong;Zhu Jiang;Dai Changyou;Tang Jie(Jiangxi Provincial Key Laboratory of Industrial Ceramics,Pingxiang University,Pingxiang,Jiangxi 337055;Ceramics Science Institute,China Building Materials Academy;Shinco Environmental Protection Co.Ltd.;RuiTai Technology Co.Ltd.)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2020年第1期31-36,共6页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金项目(21866026)
江西省重点研发计划项目(20192BBG70058)
江西省教育厅科学技术研究项目(GJJ161247)
关键词
脱硝
钒
钼
二氧化钛
二氧化硅
二氧化硫
denitration
vanadium
molybdenum
titanium oxide
silicon oxide
sulfur dioxide
