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EXAFS peaks and TPR characterizing bimetallic interactions: Effects of impregnation methods on the structure of Pt-Ru/C catalysts
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نویسنده
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chen n.-y. ,liu m.-c. ,yang s.-c. ,chang j.-r.
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منبع
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journal of spectroscopy - 2014 - دوره : 2014 - شماره : 0
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چکیده
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To investigate bimetallic interactions,pt-ru/c catalysts were prepared by coimpregnation (pt-ruco/c) and successive impregnation (ru-ptse/c),while pt/c,ru/c,and reduced pt-rublack were used as reference. those samples were characterized by xas and tpr. when pt(absorber)-ru(backscatter) phase-and-amplitude correction is applied to fourier transformed (ft) exafs of pt-rublack at pt edge,the characteristic peak of pt-ru interactions appears at 2.70 ǻ,whereas,when pt-pt correction is applied,the peak appears at about 2.5 ǻ. detailed exafs analysis for pt-ruco/c and pt-ruse/c confirms the nature of the characteristic peak and further indicates that the interactions can semiquantitatively be determined by the relative intensity between pt-ru and pt-pt characteristic peaks. this simple method in determining bimetallic interaction can be extended to characterize pt-pd/γ-al2o3. however,for pt-re/γ-al 2o3,pt-re interactions cannot be determined by the method because of the overlap of pt-pt and pt-re characteristic peaks due to similar phase functions. © 2014 nan-yu chen et al.
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آدرس
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department of chemical engineering,national chung cheng university, Taiwan, department of chemical engineering,national chung cheng university, Taiwan, department of chemical engineering,national chung cheng university, Taiwan, department of chemical engineering,national chung cheng university, Taiwan
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Authors
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