Hebert Sabrina Christina, Stöwe Klaus
Department of Natural Science, Professorship of Chemical Technology, Chemnitz University of Technology, 09111, Chemnitz, Germany.
ChemistryOpen. 2022 Mar;11(3):e202100282. doi: 10.1002/open.202100282.
Cerium-bismuth oxides have emerged as promising candidates for Diesel soot oxidation. The catalysts are synthesized via automated co-precipitation methods. T values, where 50 % of soot is oxidized, and the dynamic oxygen storage capacity (OSC ) are used to compare the catalytic activity. The activity is measured by thermogravimetric methods. The synthesized catalysts are characterized through powder X-ray diffraction (PXRD), Raman spectroscopy, and specific surface area (S ) measurements. This work investigates the influence of the contact mode between soot and catalyst. The literature-known manual contact modes "loose", "tight", and "wet" are compared with our developed automated contact mode, using a dual asymmetric centrifuge. The rotation speed rs and mixing time t have been varied independently. Both factors influence the T value. A continuous transition from loose to tight contact mode with increasing rotation speed rs can be shown. Furthermore, the automated contact mode shows better reproducibility behavior compared to manual contact modes.
铈铋氧化物已成为柴油烟灰氧化的有前景的候选材料。这些催化剂通过自动共沉淀法合成。使用50%烟灰被氧化时的温度值（T值）和动态储氧能力（OSC）来比较催化活性。活性通过热重法测量。合成的催化剂通过粉末X射线衍射（PXRD）、拉曼光谱和比表面积（S）测量进行表征。这项工作研究了烟灰与催化剂之间接触模式的影响。使用双不对称离心机，将文献中已知的手动接触模式“松散”、“紧密”和“湿润”与我们开发的自动接触模式进行比较。转速rs和混合时间t已独立变化。这两个因素都会影响T值。可以显示随着转速rs增加，从松散接触模式到紧密接触模式的连续转变。此外，与手动接触模式相比，自动接触模式表现出更好的可重复性。
