Nb-Mo-V-TiO_(2)低温脱硝催化剂及其硫酸氢铵分解性能

Nb-Mo-V-TiO_(2) low-temperature denitration catalyst and its performance in ammonium hydrogen sulfate decomposition

通过浸渍法制备一系列Nb掺杂V-Mo-Ti催化剂,研究V_(2)O_(5)负载量及Nb掺杂量对催化剂低温脱硝活性的影响,并测试其硫酸氢铵分解性能。采用XRD、N_(2)吸附-脱附、H_(2)-TPR、NH_(3)-TPD、IR等测试手段对催化剂进行表征。结果表明,Nb掺杂促进了V-Mo-Ti的氧化还原性能,提升催化剂的表面酸性,使催化剂具有更加优异的低温脱硝性能;当空速5 000 h^(-1),反应温度180℃时,1.5Nb-6V-3Mo-Ti催化剂的脱硝效率达到100%。同时Nb掺杂提升了催化剂NO氧化能力,促进硫酸氢氨与NO反应的进行,提升催化剂的低温抗水硫中毒性能。

A series of Nb-doped V-Mo-Ti catalysts were prepared by impregnation method.The influence of V_(2)O_(5) load and Nb doping on the low-temperature denitration activity of the catalyst was investig-ated,and the decomposition performance of catalyst in ammonium hydrogen sulfate was explored.The cata-lysts were characterized by using XRD,N_(2) adsorption-desorption,H_(2)-TPR,NH_(3)-TPD and IR.The results show that Nb doping promotes the redox performance and improves the surface acidity of the catalyst,which makes the catalyst having more excellent denitrification performance at low temperature.Under the GHSV of 5000 h^(-1),the denitrification efficiency of 1.5Nb-6V-3Mo-Ti catalyst reaches 100%at 180℃.At the same time,Nb doping improves the NO oxidation capacity of the catalyst and promotes the reaction of ammonia hydrogen sulfate and NO,thus improving the water-sulfur toxicity resistance of the catalyst at low temperature.