久久无码人妻一区二区三区午夜_久久久久精品久久久久影院蜜桃_亚洲综合欧美色五月俺也去_交换娇妻呻吟声不停中文字幕

每周分享：Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

今天給大家分享的是2014年8月份 《Chemical Engineering Journal》上發表的一篇名為：Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

文章摘要如下：

A series of manganese-niobium mixed oxide (Mn–Nb) catalysts were prepared by homogeneous precipitation method and tested for low temperature selective catalytic reduction of NOx with NH3 (NH3-SCR). These catalysts were characterized by N2 adsorption, X-ray diffraction, H2-TPR, X-ray photoelectron spectroscopy, NOx-TPD and NH3-TPD. Among the series of Mn–Nb catalysts, Mn2Nb1Ox calcined at 500 °C exhibited the best catalytic activity. MnOx had stronger redox capability than Mn2Nb1Ox, resulting in lower N2 selectivity due to the unselective oxidation of NH3 at relatively high temperatures. The addition of Nb to MnOx enhanced the acidity, especially the Brønsted acidity, which is responsible for the low temperature SCR activity. The combination of MnOx with strong redox capability and NbOx with high acidity simultaneously led to high NOx conversion and N2 selectivity over the Mn2Nb1Ox catalyst.

該文章中材料表征采用的是美國麥克儀器AutoChem 2920

詳情可參考下面鏈接：

http://www.sciencedirect.com/science/article/pii/S1385894714003544