NOx reduction by urea under lean conditions over single step sol–gel Pt/alumina catalyst
NOx reduction by urea under lean conditions over single step sol–gel Pt/alumina catalyst
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在贫油条件下单步溶胶-凝胶铂/氧化铝催化剂上尿素还原氮氧化物
DOI：
10.1016/s0926-3373(01)00318-6
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发表时间：
2002
影响因子：
22.1
通讯作者：
R. Hammerle
中科院分区：
文献类型：
--
作者：
E. Seker;N. Yaşyerli̇;E. Gulari;C. Lambert;R. Hammerle
采用单步溶胶-凝胶法在氧化铝催化剂上制备了2% Pt（指定为2% Pt- sg），并在氧化条件下测试了其与尿素水溶液的氧化还原活性。我们的研究结果表明，在低至150°C时可以获得~ 99%的nox转化率，但在350°C以上，由于含氮化合物氧化产生的额外的NO和no2，转化率变为负的。我们还发现，2% Pt-SG的nox转化活性强烈依赖于水分含量而不是尿素含量，饲料中存在7%的氧气可将nox的最高转化温度从250°C降低到150°C。
We prepared 2% Pt on alumina catalyst using a single step sol–gel process (designated as 2% Pt-SG) and tested its activity for NOxreduction with aqueous urea solutions under oxidizing conditions. Our results show that ∼99% NOxconversion was obtained as low as 150°C but above 350°C, the conversion became negative because of the additional formation of NO and NO2from the oxidation of nitrogen-containing compounds. We also found that NOxconversion activity of 2% Pt-SG is strongly dependent on water content rather than on urea amount and the presence of 7% oxygen in the feed lowers the maximum NOxconversion temperature from 250 to 150°C.