| 摘要: | 摘要： Direct decompositions of nitric oxide (NO) by La 0.7 Ce 0.3 SrNiO 4 , La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 are experimentally investigated, and the catalysts are tested with different operating parameters to evaluate their activities. Experimental results indicate that the physical and chemical properties of La 0.7 Ce 0.3 SrNiO 4 are significantly improved by doping with Ba and partial substitution with Pr. NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 are 32% and 68%, respectively, at 400 °C with He as carrier gas. As the temperature is increased to 600 °C, NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , respectively, reach 100% with the inlet NO concentration of 1000 ppm while the space velocity is fixed at 8000 hr −1 . Effects of O 2 , H 2 O (g) , and CO 2 contents and space velocity on NO decomposition are also explored. The results indicate that NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , respectively, are slightly reduced as space velocity is increased from 8000 to 20,000 hr −1 at 500 °C. In addition, the activities of both catalysts (La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 ) for NO decomposition are slightly reduced in the presence of 5% O 2 , 5% CO 2 , or 5% H 2 O (g) . For durability test, with the space velocity of 8000 hr −1 and operating temperature of 600 °C, high N 2 yield is maintained throughout the durability test of 60 hr, revealing the long-term stability of Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 for NO decomposition. Overall, Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 shows good catalytic activity for NO decomposition. Implications: Nitrous oxide (NO) not only causes adverse environmental effects such as acid rain, photochemical smog, and deterioration of visibility and water quality, but also harms human lungs and respiratory system. Pervoskite-type catalysts, including La 0.7 Ce 0.3 SrNiO 4 , La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , are applied for direct NO decomposition. The results show that NO decomposition can be enhanced as La 0.7 Ce 0.3 SrNiO 4 is substituted with Ba and/or Pr. At 600 °C, NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 reach 100%, demonstrating high activity and good potential for direct NO decomposition. Effects of O 2 , H 2 O (g) , and CO 2 contents on catalytic activities are also evaluated and discussed.
其他題名： J Air Waste Manag Assoc
出版者： United States: Taylor & Francis
出版日期： 2016-06-02
出處： Journal of the Air & Waste Management Association (1995), 2016-06, Vol.66 (6), p.619-630
資源來源： Taylor & Francis Journals
版權： 2016 A&WMA 2016
版權： 2016 A&WMA
識別號： ISSN: 1096-2247
識別號： ISSN: 2162-2906
識別號： EISSN: 2162-2906
識別號： DOI: 10.1080/10962247.2016.1158133
識別號： PMID: 26934380 |
