Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides
Removal of NO by reversible adsorption on Fe-Mn based transition metal oxides
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DOI：
10.1021/la0102657
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发表时间：
2001-08-07
期刊：
影响因子：
3.9
通讯作者：
Yang, RT
中科院分区：
文献类型：
--
作者：
Huang, HY;Yang, RT
制备了一系列铁锰基过渡金属氧化物，并在25 ℃、O2-存在下用于NO的吸附。采用BET比表面积、TPD、XRD和FTIR等手段对吸附剂进行了表征。热重分析和荧光NO/NOx分析仪实验均表明，该复合氧化物是一种高效、可逆的NO吸收剂。NO_3容量的大小顺序为：Fe-Mn-Ti，Fe-Mn-Zr> Fe-Mn-Ce，Fe-Mn-Ni> Fe-Mn-Co> Fe-Mn-Cu，Fe-Mn。对于Fe-Mn-Ti和Fe-Mn-Zr氧化物，最大NO_2容量达到42 - 45 mg/g吸附剂。SO2和CO2对NO的吸附量影响不大。H2O对NOx的吸附有明显的抑制作用，但这种抑制作用是可逆的。TPD曲线表明，NO2物种可以在低于400 ℃的温度下解吸。在这些氧化物上的NO去除的高效率与它们在25 ℃下将NO氧化成NO2的高活性有关。红外光谱表明硝酸根是NO吸附的最终物种。NO2和亚硝酸盐是硝酸盐在氧化物上形成的中间产物。
A series of Fe-Mn-based transition metal oxides were prepared and used for NO adsorption at 25 degreesC in the presence Of O-2. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NOx analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NO, capacity decreased in the order of Fe-Mn-Ti, Fe-Mn-Zr > Fe-Mn-Ce, Fe-Mn-Ni > Fe-Mn-Co > Fe-Mn-Cu, Fe-Mn. The maximum NO, capacity reached 42-45 mg/g of sorbent for the Fe-Mn-Ti and Fe-Mn-Zr oxides. SO2 and CO2 decreased the NO adsorption amount only slightly. H2O decreased the NOx adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NO, species could desorb at temperatures below 400 degreesC. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO2 at 25 degreesC. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO2 and nitrite were the intermediates during nitrate formation on the oxides.