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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Selective oxidation of CO in H2-rich stream over Au/CeO2 and Cu/CeO2 catalysts: An insight on the effect of preparation method and catalyst pretreatment
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Selective oxidation of CO in H2-rich stream over Au/CeO2 and Cu/CeO2 catalysts: An insight on the effect of preparation method and catalyst pretreatment

机译：Au / CeO2和Cu / CeO2催化剂上富H2物流中CO的选择性氧化：对制备方法和催化剂预处理效果的见解

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Selective oxidation of CO in H2-rich stream was studied on Au/CeO2 and Cu/CeO2 catalysts, investigating the effect of both the preparation technique and the catalyst pretreatment towards the catalytic performance. It was found that in the case of Au catalysts the sample prepared by deposition-precipitation was more active than that prepared by co-precipitation. The opposite trend was instead observed on Cu samples. On all tested catalysts a higher pre-calcination temperature of catalysts resulted in a lower CO conversion. The extent of this effect was strong on Au samples and less evident on Cu ones. On both Au and Cu samples selectivity towards CO oxidation decreased on increasing reaction temperature, being almost independent from preparation and pretreatment. On the basis of characterisation data (H2-TPR, XRD, XPS, and BET surface area) the effect of preparation method and catalyst pretreatment was accounted for both the different particle size and surface amount of active species (Au or CuO_x). According to a Mars-van Krevelen mechanism, implying lattice oxygens of the cerium oxide and CO (and H2) adsorbed on the active species, it was suggested that on Au/CeO2 the PROX reaction is strongly affected by the status of gold, which has a key role in the CO activation step, whereas on Cu/CeO2 the performance are significantly influenced by the ceria morphology/reactivity.
机译：在Au / CeO2和Cu / CeO2催化剂上研究了富H2物流中CO的选择性氧化，研究了制备技术和催化剂预处理对催化性能的影响。发现在金催化剂的情况下，通过沉积沉淀制备的样品比通过共沉淀制备的样品更具活性。相反，在铜样品上观察到相反的趋势。在所有测试的催化剂上，较高的催化剂预煅烧温度导致较低的CO转化率。这种影响的程度在金样品上很明显，而在铜样品上则不太明显。在Au和Cu样品上，随着反应温度的升高，对CO氧化的选择性均降低，几乎与制备和预处理无关。根据表征数据（H2-TPR，XRD，XPS和BET表面积），制备方法和催化剂预处理的效果考虑了活性物质（Au或CuO_x）的不同粒径和表面量。根据Mars-van Krevelen机理，暗示氧化铈和CO（和H2）的晶格氧吸附在活性物种上，这表明在Au / CeO2上，PROX反应受金的状态的强烈影响。在CO活化步骤中起关键作用，而在Cu / CeO2上，氧化铈的形态/反应性会显着影响性能。

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