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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Influence of gold and manganese as promoters on surface and catalytic performance of Fe_2O_3/Al_2O_3 system
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Influence of gold and manganese as promoters on surface and catalytic performance of Fe_2O_3/Al_2O_3 system

机译：金和锰促进剂对Fe_2O_3 / Al_2O_3体系表面和催化性能的影响

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The physicochemical,surface and catalytic properties of pure and doped Fe_2O_3/Al_2O_3 solid catalysts with Au and MN_2O_3 calcined at 300,500 and 700 deg C were investigated.The dopant concentration of Au was varied between 0.4 and 1.6 mol%,while MN_2O_3 concentration was varied between 1.0 and 8.0 mol%.The techniques employed were DTA,XRD,TPR,EDX,nitrogen adsorption at-196 deg C,CO oxidation by O_2 at 225-275 deg C and H_2O_2 decomposition in aqueous solution at 30-50 deg C.The results obtained revealed that the doping of Fe_2O_3/Al_2O_3 solids with different amounts of Au and MN_2O_3 changed the degree of crystallinity of Al_2O_3 and Fe_2O_3 phases.The doping process led to a progressive increase in the specific surface area of the treated solid catalysts to an extent proportional to the amount of Au and MN_2O_3 added.This process led also to a progressive increase in the catalytic activities of the investigated solid catalysts towards CO oxidation by O_2 and H_2O_2 decomposition.The doping of solid catalysts with Au calcined at 300,500 and 700 deg C exhibited catalytic activity in CO oxidation by O_2 higher than those measured for solid catalysts doped with MN_2O_3 calcined at the same temperatures.Opposite results have been observed in case of H_2O_2 decomposition.These findings indicate that the active sites taking part in CO oxidation by O_2 are different from those involved in H_2O_2 decomposition.
机译：研究了在300,500和700℃下煅烧的纯金和掺杂Fe_2O_3 / Al_2O_3固体催化剂与Au和MN_2O_3的物理化学，表面和催化性能。Au的掺杂浓度在0.4到1.6 mol％之间变化，而MN_2O_3的浓度在0.4到1.6 mol％之间变化。分别使用1.0和8.0 mol％的技术.DTA，XRD，TPR，EDX，在-196℃下的氮吸附，在225-275℃下由O_2氧化CO以及在30-50℃下在水溶液中分解H_2O_2的技术。结果表明，不同量的Au和MN_2O_3掺杂Fe_2O_3 / Al_2O_3固体改变了Al_2O_3和Fe_2O_3相的结晶度，掺杂过程导致处理后的固体催化剂的比表面积逐渐增加。与Au和MN_2O_3的添加量成正比。该过程还导致所研究的固体催化剂对O_2和H_2O_2分解产生的CO氧化的催化活性逐渐提高。在300,500和700℃下煅烧的Au掺杂的固体催化剂在CO氧化中通过O_2表现出的催化活性高于在相同温度下煅烧掺有MN_2O_3的固体催化剂的测量。研究结果表明，参与O_2氧化CO的活性位点与参与H_2O_2分解的活性位点不同。

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