State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing, China.
J Hazard Mater. 2010 Sep 15;181(1-3):722-8. doi: 10.1016/j.jhazmat.2010.05.072. Epub 2010 Jun 9.
A BaMnCe ternary catalyst was prepared by impregnating barium acetate on MnO(x)-CeO(2) mixed oxides, with the monoxide supported catalysts and the solid solution support as references. The activities of the catalysts for soot oxidation were evaluated in the presence of NO under an energy transference controlled regime. BaMnCe presented the lowest maximal soot oxidation rate temperature at 393 degrees C among the catalysts investigated. Although BaMnCe experienced a loss in the specific surface area and low-temperature redox property due to blocking of the support pores by barium carbonate, its superior soot oxidation activity highlighted the importance of relatively stable bidentate/monodentate nitrates coordinated to Mn(x+) and Ce(x+) sites and more stable ionic barium nitrate. About half of the nitrates stored on this catalyst decomposed within the temperature interval of 350-450 degrees C, and the ignition temperature of soot decreased significantly with involvement of the nitrates or NO(2) released.
采用浸渍法制备了 BaMnCe 三元催化剂，以 MnO(x)-CeO(2)混合氧化物负载的单氧化物催化剂和固溶体载体作为参比。在能量传递控制条件下，考察了催化剂在存在 NO 的情况下对炭黑氧化的活性。在所研究的催化剂中，BaMnCe 的最大炭黑氧化速率温度最低，为 393°C。尽管 BaMnCe 由于碳酸钡堵塞载体孔而导致比表面积和低温氧化还原性能下降，但它具有优越的炭黑氧化活性，突出了相对稳定的双齿/单齿硝酸盐与 Mn(x+)和 Ce(x+)位配位以及更稳定的离子硝酸钡的重要性。大约一半的硝酸盐在 350-450°C 的温度区间内分解，随着硝酸盐或释放的 NO(2)的参与，炭黑的着火温度显著降低。
