La-Ce-attapulgite催化分解NO的研究
Experimental research on catalytic decomposition of nitrogen oxide over La-Ce-attapulgite catalyst
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摘要: 采用化学共混法制备系列La-Ce-attapulgite催化剂，并在固定床反应器中进行NO催化分解性能测试。实验考察了稀土加入量、La/Ce配比、共混液pH值和催化剂的活化煅烧温度等制备条件对催化剂脱硝性能的影响。结果表明：稀土加入量为2%，共混液pH=7，La/Ce比值为LaxCe(1-x)(x=0.5)，煅烧温度400℃时，La-Ce-attapulgite催化剂具有较为良好的NO催化分解活性。在空速5 500 h-1，NO进口浓度为0.08%，氧含量5%，反应温度为400℃的实验条件下，其NO分解脱硝率可达64.2%。此外，还用XRD和SEM对催化剂的性质进行了表征。Abstract: A series of La-Ce-attapulgite catalysts with different compositions prepared by chemical blending method were tested for the catalytic decomposition of nitrogen oxide in a fixed bed flow reactor. Effects of catalyst preparing conditions, including the rare earth content, ratio of La/Ce, pH value of the chemical blending, calcination treatment temperature of the catalysts on the catalytic activity of nitrogen oxide decomposition were investigated. The La-Ce-attapulgite catalyst prepared under the optimal conditions: rare earth content, La∶Ce, pH value of the chemical blending and calcination treatment temperature was 2%, LaxCe(1-x) ( x=0.5), 7 and 400℃, respectively, was identified as the most active catalyst for the catalytic decomposition of nitrogen oxide, and the denitration rate could be up to 64.2% under reaction conditions of 400℃, gas space velocity of 5 500 h-1, the flue gas of 0.08% NO and 5% O2 balancing by N2. Additionally, the characteristics of the La-Ce-attapulgite catalysts were studied by SEM and XRD.
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Key words:
- NO /
- catalytic decomposition /
- rare earth /
- attapulgite /
- denitration rate
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