PtFe Alloy Nanoparticles Catalyst

As can be known, the second additive can change the electric performance of a noble metal, so that the catalytic ability of the alloy catalyst will be improved a lot. In this section, we investigate the relation between the structural properties and the PROX catalytic performance of PtFe alloy nanoparticles catalysts supported with alumina. Table 29.1 shows the compositions of the samples used in this study. The weight percent of Pt was fixed as 3 wt% in the samples three Fe/Pt atomic ratios (I/I, 2/1, and 3/1) of PtFe alloy nanoparticle catalysts were prepared. 

Mossbauer technique is effective for the identification of catalyst components in terms of active phase or active sites and search for correlations between these components and one or more of the catalytic properties [15,17-23]. Here, Fe Mossbauer spectroscopy was employed to characterize the iron state in the as-prepared materials. Fig. 29.1 shows 

29 MOSSBAUERSPECTROSCOPIC INVESTIGATIONS OF NOVEL BIMETAL CATALYSTS FOR PREFERENHAL CO 

TABLE 29.1 Compositions of the Samples Used in this Study  

Taking into consideration on a very recent report that small monodispersed FeO nanoparticles were synthesized through reductive decomposition of Fe(acac)3 with oleic acid and oleylamine both as surfoctants and solvents at 220-300 °C [24], we can speculate that partial ferric irons were only reduced and stabilized in ferrous state due to the addition of-y-Al203 even in the existence of a noble metal promoter such as Pt in the chemical process used in the present study. This is reasonable since the ethylene glycol and oleic acid or oleylamine are relatively soft reducers. The results also implied that a strong chemical interaction existed between the support of Y-AI2O3 and the PtFe alloy nanoparticles. 

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Three kinds of novel alumina-supported PtFe, PtFe2, and PtFe3 alloy nanoparticles were prepared from Pt(acac)2 and Fe(acac)3 reduced by ethylene glycol in Ar atmosphere at 185 °C [I I,I2]. The Ir-Fe bimetal catalysts used in this study... 

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