López-Suárez F E, Bueno-López A, Illán-Gómez M J, Adamski A, Ura B, Trawczynski J
Inorganic Chemistry Department, University of Alicante, Alicante, Spain.
Environ Sci Technol. 2008 Oct 15;42(20):7670-5. doi: 10.1021/es8009293.
Copper catalysts prepared using four supports (Mg- and Sr-modified Al2O3 and MgTiO3 and SrTiO3 perovskites) have been tested for soot oxidation by 02 and NOx/O2. Among the catalysts studied, Cu/SrTiO3 is the most active for soot oxidation by NOx/O2 and the support affects positively copper activity. With this catalyst, and under the experimental conditions used, the soot combustion by NOx/O2 presents a considerable rate from 500 degrees C (100 degrees C below the uncatalysed reaction). The Cu/ SrTiO3 catalyst is also the most effective for NOx chemisorption around 425 degrees C. The best activity of Cu/SrTiO3 can be attributed to the improved redox properties of copper originated by Cu-support interactions. This seems to be related to the presence of weakly bound oxygen on this sample. The copper species present in the catalyst Cu/SrTiO3 can be reduced more easily than those in other supports, and for this reason, this catalyst seems to be the most effective to convert NO into NO2, which explains its highest activity for soot oxidation.
使用四种载体（镁和锶改性的Al2O3以及MgTiO3和SrTiO3钙钛矿）制备的铜催化剂已针对02和NOx/O2的烟灰氧化进行了测试。在所研究的催化剂中，Cu/SrTiO3对NOx/O2烟灰氧化最具活性，且载体对铜活性有积极影响。使用该催化剂，在所用实验条件下，NOx/O2的烟灰燃烧在500摄氏度时呈现出相当可观的速率（比无催化反应低100摄氏度）。Cu/SrTiO3催化剂在425摄氏度左右对NOx化学吸附也最有效。Cu/SrTiO3的最佳活性可归因于铜与载体相互作用产生的铜氧化还原性能的改善。这似乎与该样品上存在弱结合氧有关。催化剂Cu/SrTiO3中存在的铜物种比其他载体中的铜物种更容易还原，因此，该催化剂似乎是将NO转化为NO2最有效的催化剂，这解释了其对烟灰氧化的最高活性。
