摘要
采用溶胶凝胶法制备了不同γ-Al2O3含量的钛铝复合载体,以此为载体采用浸渍法负载V2O5和WO3制备了一系列催化剂。采用X射线衍射(XRD)、比表面积测定(BET)、程序升温还原(H2-TPR)、高分辨率透射电子显微镜(HRTEM)等表征技术对催化剂表面形态进行分析,同时在模拟氨气选择性催化还原NO(NH3-SCR)的反应条件下,对催化剂的脱硝反应活性和SO2抗中毒进行考察。结果发现,TiO2和γ-Al2O3之间的协同作用使得V2O5-WO3/TiO2-γ-Al2O3催化剂的脱硝效率及活性窗口明显优于单一载体制备的催化剂,表现出了良好的热稳定性和抗SO2毒化能力,特别是V2O5-WO3/TiO2-15%γ-Al2O3在310～460℃,NO的转化率均在80%以上,反应窗口最宽。各种表征结果表明,TiO2-γ-Al2O3复合载体中γ-Al2O3高度分散在TiO2上,复合载体具有较大的比表面积,同时具有较强的还原能力。
A series of titania-alumina mixed oxide with different amount of γ-Al2O3were prepared by sol-gel methods,which were loaded by V2O5 and WO3 to obtain several SCR catalysts.Surface properties of those samples were studied by various characterizations techniques,like XRD,BET,H2-TPR and HRTEM.The catalytic performance for the selective catalytic reduction of NO with NH3（NH3-SCR）and the effect of SO2 in the simulated smog on the catalytic activity were investigated as well.It is found that the synergy between γ-Al2O3 and TiO2 can improve effectively the catalytic performance of V2O5-WO3/TiO2-γ-Al2O3 catalysts effectively and broaden the temperature window of SCR activity as well as strengthen the resistance to SO2 poisoning.In particular,the V2O5-WO3/TiO2-15% γ-Al2O3 sample exhibited 80% NO conversion in the wide temperature range of 310~460 ℃.All the characterization results show that γ-Al2O3 is in a well-dispersed state on the surface of TiO2;the composite support has a large specific surface area and the binary oxide possesses a comparatively strong redox property.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2012年第10期1258-1263,共6页
Journal of Fuel Chemistry and Technology
基金
国家高技术研究发展计划(863计划
2007AA061802)
江苏省自然科学基金(BK2012347)
