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近期我们报道了Au/FeOx-羟基磷灰石(HAP,Ca10(PO4)6(OH)2)催化剂应用于CO氧化反应的研究结果,该催化剂不仅具有很高的低温CO氧化活性和反应稳定性,同时也具有很好的高温抗烧结性能,即使600oC焙烧后依然能够维持很好的CO氧化反应活性.为了进一步研究Au/FeOx-HAP催化CO氧化反应中HAP和FeOx的作用,本文对该催化剂进行了更加深入的表征.X射线光电子能谱结果表明,HAP能与Au和FeOx形成强相互作用,进而在高温条件下稳定Au和FeOx纳米粒子.根据原位漫反射红外结果,FeOx则主要通过改变反应路径和中间产物的方式起到促进催化剂CO氧化活性的作用.结合透射电镜,穆斯堡尔谱和原位漫反射红外结果可知,Au/FeOx-HAP催化剂良好的反应稳定性源于其优异的抗碳酸盐累积能力.
Recently, we reported the results of the studies on the CO oxidation of Au / FeOx-hydroxyapatite (HAP, CaO (PO4) 6 (OH) 2) catalysts. These catalysts not only have high CO oxidation activity and reaction stability , But also has a good high temperature sintering resistance performance, even after 600oC calcination can still maintain a good CO oxidation reaction activity.In order to further study the catalytic effect of Au / FeOx-HAP catalytic CO oxidation HAP and FeOx, this article catalyst X-ray photoelectron spectroscopy results show that HAP can form strong interaction with Au and FeOx, and then stabilize the Au and FeOx nanoparticles under high temperature conditions.According to the in situ diffuse reflectance infrared results, FeOx mainly through The reaction pathway and intermediates can be used to promote the activity of CO oxidation. Combining with transmission electron microscopy, Mossbauer spectroscopy and in-situ diffuse reflectance infrared spectroscopy, the good reaction stability of Au / FeOx-HAP catalyst is derived from Excellent resistance to carbonate accumulation.