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环境化学

Effect of high temperature calcination on the oxidation of nitric oxide to nitrogen dioxide over Ru/ZrO₂ catalyst

摘要：采用浸渍法制备了一系列负载Ru催化剂,并将其应用于NO催化氧化反应.同时,对Ru/ZrO₂样品在不同温度下进行焙烧处理,并通过X-射线衍射(XRD)、程序升温还原(TPR)和透射电子显微镜(TEM)等技术对不同温度焙烧的Ru/ZrO₂进行表征,根据表征结果对导致Ru/ZrO₂催化活性下降的原因进行了探讨.结果表明,Ru/ZrO₂催化剂具有很好的催化活性,在空速为180000h^-1条件下,275℃时即可获得93%的NO转化率.高温焙烧会导致Ru/ZrO₂催化活性明显下降.

Abstract：A series of Ru catalysts were prepared by impregnation and their catalytic activity for the oxidation of NO to NO₂ was evaluated. Among all the catalysts studied,the Ru/ZrO₂ catalyst exhibited the best activity and a maximal NO conversion of ca. 93% could be achieved at ca. 275℃ at a high GHSV of 180000 h^-1. Then the Ru/ZrO₂ samples were calcined at different temperatures and it was found that calcination at high temperatures leads to a considerable decrease in the activity of the Ru/ZrO₂ catalyst. The Ru/ZrO₂ catalysts calcined at different temperatures were characterized by means of X-ray diffraction(XRD),temperature-programmed reduction(TPR) and transmission electron microscopy(TEM) to elucidate the reason for the decrease in the catalytic activity of Ru/ZrO₂ after high temperature calcination.