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Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

机译:共沉淀法制备的NiO-CeO2催化剂的烟So催化氧化活性:制备pH值对催化性能的影响

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摘要

A series of NiO–CeO mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO–CeO mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer–Emmett–Teller (BET) surface area, H temperature-programmed reduction (H -TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni was incorporated into the ceria network, and it appeared that the amount on Ni that replaced Ce was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance.
机译:通过改进的共沉淀方法,在三种不同的pH值(pH = 8、9和10)下,合成了一系列NiO-CeO混合氧化物催化剂。 NiO-CeO混合氧化物样品的特征在于TGA,XRD,电感耦合等离子体原子发射光谱(ICP-AES),FTIR,Brunauer-Emmett-Teller(BET)表面积,H程序升温还原(H -TPR),电子显微镜(高角度环形暗场透射电子显微镜/能量色散X射线光谱仪(HAADF-TEM / EDS))。在松散和紧密的接触条件下研究了样品对烟灰氧化的催化活性。催化剂表现出高的BET表面积,其平均晶体尺寸随pH值而变化。电子显微镜结果表明,负载在大板状NiO(约20 nm厚)颗粒上的CeO形成了微晶(约5 nm)。 X射线衍射表明,一部分镍被掺入二氧化铈网络中,并且当在较低的pH值下进行混合氧化物的合成时,似乎取代镍的镍的含量更高。在合成的催化剂中,Ni-Ce-8(pH = 8)表现出最好的催化性能。

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