Zn对工业V-Mo/Ti脱硝催化剂性能的影响

Effect of Zn on Catalytic Performances of Industrial V-Mo/Ti De-NO Catalyst

采用浸渍法将不同含量的Zn负载到工业V-Mo/Ti脱硝催化剂上,评价其NH3选择性催化还原NO的活性。采用XRD、N2-吸附脱附、NH3-TPD、H2-TPR和NO-TPD等,对催化剂进行理化表征。结果表明,Zn的负载,没有改变V-Mo/Ti催化剂的晶型结构,但降低了V-Mo/Ti催化剂的比表面积、还原性能,减少催化剂的酸量,降低了催化剂对NO的吸附性能,从而降低脱硝催化剂的催化剂性能。同时,采用0.5 mol/L的H2SO4溶液对Zn中毒的催化剂进行清洗,可以有效去除催化剂上负载的Zn。

Different contents of Zn was loaded on V-Mo/Ti catalyst by impregnation method,and the activity of selective catalytic reduction of NO by NH3was evaluated.The catalysts were characterized by XRD,N2adsorption-desorption,NH3-TPD,H2-TPR and NO-TPD.The results show that Zn loading does not change the crystal structure of V-Mo/Ti catalyst,but reduces the specific surface area and reduction performances of V-Mo/Ti catalyst.Furthermore,Zn loading reduces the acid content as well as the NO adsorption performance of the catalyst,decreasing the catalytic denitration performances of the catalyst.With 0.5 mol/L H2SO4solution for washing the Zn poisoned catalyst,the Zn loaded on the catalyst can be effectively removed.