摘要
某商业SCR催化剂在运行了1.4万、2.5万、3.0万h后,脱硝效率均显著下降,且运行时间最短的催化效果最差。对此,分别采用H2SO4及NH4Cl进行再生,并利用BET、X射线衍射(XRD)、扫镜电镜(SEM)及X射线能谱(EDX)等测试手段对催化剂进行表征。结果表明:H2SO4和NH4Cl溶液均具有良好的再生效果,且后者效果优于前者,再生后催化剂在实验室模拟条件下最高脱硝效率大于90%;催化剂再生后表面活性组分未流失,且受空速的影响更小;运行时间最短的催化剂由于受高温的影响,表面形态发生严重的团聚,孔结构被破坏,再生工艺对其修复作用并不明显。
After run for 14 400,25 144 and 30 288 hours,the denitration efficiency of a commercial SCR catalyst decreased significantly, respectively. Moreover, the one with the shortest operation time had the poorest performance. Thus, the sulfuric acid and ammonia chloride was used to re- generate the catalyst,and such tests as the BET specific surface area,XRD,SEM and EDX were applied to characterize it before and after the regeneration. The results show that,both the H2 SO4 and NH4 C1 had good regeneration effect,and the latter had better one. The denitration efficiency of the regenerated catalyst can reach up to 90 % in the lab simulation condition. The active compo- nents on surface of the regenerated catalyst had no change and was affected less by space velocity. Due to high temperature, the catalyst with operation time of 14 400 hours was deactivated： the nanoparticles on the catalyst surface were seriously sintered and the pore structure was destroyed badly, resulting in nearly no effective recovery by regeneration.
出处
《热力发电》
CAS
北大核心
2014年第2期109-113,共5页
Thermal Power Generation
关键词
烟气脱硝
选择性催化还原
催化剂
再生
H2SO4
NH4CL
活性
比表面积
flue gas denitrification selective catalytic reduction catalyst
regeneration sulfuricacid ammonia chloride activity
specific area
