Mn-La-Ce-Ni-O_x/P84一体化滤布的低温脱硝影响因素  

Influencing factors on low-temperature deNO_x performance of Mn-La-Ce-Ni-Ox/ P84

作　　者：杨波[1] 沈岳松[1] 邱云顺 曾燕伟[1] 沈树宝[2] 祝社民[1] YANG Bo SHEN Yuesong QIU Yunshun ZENG Yanwei SHEN Shubao ZHU Shemin(College of Material Science and Engineering, Nanjing Tech University, Nanjing 210009, China College of Life Science and Pharmaccutical Engineering, Nanjing Tech University, Nanjing 210009, China)

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]南京工业大学生物与制药工程学院,南京210009

出　　处：《环境工程学报》2016年第11期6583-6587,共5页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划资助项目(2012BAE01B03);国家自然科学基金资助项目(51272105);江苏省环保厅科研课题(2013006);江苏高校优势学科建设工程资助项目(PADP)

摘　　要：将550℃煅烧的Mn-La-Ce-Ni-O_x（Mn/La/Ce/Ni=2.5∶2.5∶1∶1）粉体均匀分散在蒸馏水中,采用P84滤料浸渍吸附复合氧化物分散液,经干燥、喷洒聚四氟乙烯乳液固定化,制备除尘脱硝一体化Mn-La-Ce-Ni-O_x/P84滤布。研究了Mn-La-Ce-Ni-O_x/P84滤布低温选择性催化还原（SCR）NO的活性。分别考察了反应温度、NH_3/NO摩尔比、O_2体积分数、复合氧化物负载量和SO_2等因素对Mn-La-Ce-Ni-O_x/P84滤布NH3-SCR脱除NO活性的影响。结果表明,当催化剂负载量大于250 g·m-2时,在100~200℃温度范围内一体化滤布催化活性均大于90%,200℃时脱硝活性达98.3%。当氧含量〈6%、NH3/NO≤1.0时,一体化滤布脱硝活性随NH3/NO摩尔比的增大而增大,NH_3过量与氧过量时无影响。200℃时,通入300×10-6SO_2对Mn-La-Ce-Ni-O_x/P84滤布脱硝活性有一定地抑制作用,脱除NO_x效率最低下降到88.6%,停止通入SO_2后,脱硝活性逐渐恢复。A Mn-La-Ce-Ni-O_x/ P84 catalytic filter was prepared by the loading of a P84 filter on n（ Mn） ∶n（ La） ∶ n（ Ce） ∶ n（ Ni）（ 2. 5 ∶ 2. 5 ∶ 1 ∶ 1 molar ratio of Mn-La-Ce-Ni-O_x） via an impregnation method,followed by calcining at 550 ℃. The effect of catalyst loading,reaction temperature,O2 concentration,NH_3/ NO molar ratio,and SO_2 on the low temperature catalytic performance of Mn-La-Ce-Ni-O_x/ P84 for the NH_3-selective catalytic reduction（ SCR） of NO was investigated. Mn-La-Ce-Ni-O_x/ P84 exhibited a high de-NO_xefficiency at100 to 200 ℃ with a catalyst loading of 250 g·m-2. Furthermore,the de-NO_xefficiency increased with increasing NH_3/ NO molar ratio and increasing O_2 concentration at NH_3/ NO ≤1. 0 and O_2 concentration ≤6%,although it remained constant at NH_3/ NO 1. 0 and O_2 concentration 6%. Finally,the de-NO_xefficiency of Mn-La-Ce-Ni-O_x/ P84 decreased to 88. 6% in the presence of 300 ppm SO_2 at 200 ℃ and could not be recovered to its original level following removal of the SO_2.

关 键 词：Mn-La-Ce-Ni-Ox/P84 除尘脱硝滤布 NOX脱除 

分 类 号：X51[环境科学与工程—环境工程]