【摘 要】
：
Raman spectroscopy is one of the most powerful method in in-situ study of catalytic process due to its great advantage in low wavenumber detection as compared with infrared spectroscopy(IR).However,it
【机 构】
：
College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,China
【出 处】
：
2016年分析化学前沿国际研讨会及中美分析化学研讨会
论文部分内容阅读
Raman spectroscopy is one of the most powerful method in in-situ study of catalytic process due to its great advantage in low wavenumber detection as compared with infrared spectroscopy(IR).However,it is a great challenge to monitor the trace amounts of surface species absorbed on catalysts by normal Raman as a result of its quiet low sensitivity,which greatly limits its application.In this work,we have developed a general strategy to directly monitor the active surface species and study the catalytic process via in-situ shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS)1,by synthesis gold core-silica shell-nanocatalyst satellite structure(or SHINERS satellite structure,fig.1).According to 3D-FDTD simulation,Raman signals from the surface species on the nanocatalysts can be enhanced by more than 7 orders of magnitude.With this strategy,we then studied the oxidation of CO over Pd and PtFe nanocatalysts by SHINERS,and found that superoxide and peroxide were very important intermediates for this reaction.It is also found that this strategy is general for various nanocatalysts,such as Pt,Pd,PtPd,PtFe,Au@PtFe,PdFeCu,Fe2O3 and CeO2.Thus,we believe SHINERS technique with satellite sturcture will open up new avenues for in-situ study of heterogeneous nanocatalytic process,and help to deepen the understanding of the basic concepts of catalysis.
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