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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。
The Mn-La-Ce-Ni-Ox (Mn / La / Ce / Ni = 2.5: 2.5: 1: 1) powder calcined at 550 DEG C was uniformly dispersed in distilled water and the adsorption complex oxide dispersion was impregnated with P84 filter , Dried, and sprayed with a polytetrafluoroethylene emulsion to prepare a dedusted denitration integrated Mn-La-Ce-Ni-Ox / P84 filter cloth. The activity of low temperature selective catalytic reduction (SCR) of Mn-La-Ce-Ni-Ox / P84 filter cloth was studied. The effects of reaction temperature, NH_3 / NO molar ratio, O_2 volume fraction, composite oxide loading and SO_2 on NO removal by Mn-La-Ce-Ni-Ox / P84 filter cloth were investigated. The results showed that when the catalyst loading was more than 250 g · m-2, the catalytic activity of the integrated filter cloth was more than 90% at 100 ~ 200 ℃ and the activity of denitrification was 98.3% at 200 ℃. When the oxygen content is less than 6% and NH3 / NO is less than 1.0, the denitration activity of the integrated filter cloth increases with the increase of NH3 / NO molar ratio. At 200 ℃, the denitrification activity of Mn-La-Ce-Ni-Ox / P84 filter cloth was inhibited by introducing 300 × 10-6SO_2, the efficiency of NO_x removal decreased to 88.6% Activity gradually restored.