【摘要】 以Mn/TiO2为基底的低温选择性催化还原(SCR)催化剂已在实验室研究中取得了良好进展,但目前针对该催化剂的成型化研究还相对缺乏。研究了成型工艺中添加剂对Ce掺杂Mn/TiO2催化剂(Ce-Mn/TiO2)的物理性质及其低温SCR反应活性的影响。实验结果表明,适量的甘油可以起到润滑作用,有利于降低塑性膏体的外部黏性及挤出成型;添加15%(质量分数,下同)玻璃纤维可以使催化剂纵向和横向机械强度分别增加到未添加时的4.5、3.0倍;添加5%拟薄水铝石可以提高催化剂纵向和横向机械强度,同时提升催化剂的活性与选择性;添加2.50%活性炭可以提高催化剂在低温下的活性,使NO脱除率在80℃时提高了16百分点。更多还原

【Abstract】 Mn/TiO2based catalysts showed excellent performances for low-temperature selective catalytic reduction(SCR)of NO in laboratory-scale works.However,few works have been reported on its forming process.In this paper,the forming process and catalytic reactivity of Ce-Mn/TiO2clay catalyst was studied.And the influences of different additives including glycerol,glass fiber,pseudo-boehmite and active carbon on the physical properties and catalytic activities of catalyst were then investigated.It was found that all these additives could improve the physical properties and catalytic activities in a certain degree.Glycerol could act as lubricant and was beneficial to the forming of catalysts.4.5times of longitudinal and 3.0times of transverse mechanical strength could be obtained by adding15%(wt%)glass fiber.5%additive pseudo-boehmite could not only improve the mechanical strength of catalyst but also promoted its catalytic activities and selectivity.Moreover,the pore-forming agent active carbon,with the dosage of 2.50%,could promote the denitrification efficiency at a low temperature and the NO conversion increased by 16percentage point at 80℃.更多还原