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以FeCrAl合金薄片为基底,Al2O3浆料为过渡胶体,不同摩尔比的Cu、Co为催化活性组分,制备了一系列CuxCo1-x/Al2O3/FeCrAl(x=0-1)新型整体式催化剂.采用X射线粉末衍射(XRD),扫描电子显微镜(SEM),X光电子能谱(XPS)和程序升温还原(TPR)等手段对催化剂的结构进行了表征.在微型固定床反应器上评价了催化剂的催化甲苯燃烧性能.研究结果表明:在所制备的整体式催化剂上,当Cu含量比较低时,形成了Cu-Co-O固溶体;当Cu含量比较高时,可以测得CuO的衍射峰.催化剂表面颗粒大小和形貌与Cu、Co摩尔比密切相关.在催化剂表面,Co以Co2+和Co3+价态存在,而Cu主要以Cu2+价态存在.催化剂中的Cu可以改善Co的氧化还原性,从而有利于催化剂活性的提高.在所制备的催化剂中,Cu0.5Co0.5/Al2O3/FeCrAl催化剂具有最好的活性,甲苯在374oC可以完全催化燃烧消除.
A series of novel monolithic catalysts of CuxCo1-x / Al2O3 / FeCrAl (x = 0-1) were prepared with FeCrAl alloy as substrate, Al2O3 paste as transition colloid and different molar ratios of Cu and Co as catalytically active components. The structure of the catalyst was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR) .A catalyst was evaluated on a miniature fixed bed reactor The results show that Cu-Co-O solid solution is formed when the content of Cu is low, and the diffraction peak of CuO can be measured when the content of Cu is relatively high. The particle size and morphology of the catalyst surface are closely related to the molar ratio of Cu and Co. On the catalyst surface, Co exists in the form of Co2 + and Co3 + valences, whereas Cu exists mainly in the Cu2 + valence state. Cu in the catalyst can improve the redox properties of Co, Which is conducive to the improvement of catalyst activity.In the prepared catalyst, Cu0.5Co0.5 / Al2O3 / FeCrAl catalyst has the best activity, toluene at 374oC can be completely catalytic combustion elimination.