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首页> 外文期刊>Journal of Materials Science >Pt nanoparticles inside the mesopores of TiO2-MCM-48: synthesis, characterization and catalytic activity for CO oxidation
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Pt nanoparticles inside the mesopores of TiO2-MCM-48: synthesis, characterization and catalytic activity for CO oxidation

机译：TiO2-MCM-48中孔内的Pt纳米颗粒：CO氧化的合成，表征和催化活性

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摘要

TiO2 and Pt nanoparticles were deposited in the channels of siliceous MCM-48 via a sequential incipient wetness-impregnation method employing (NH4)(2)PtCl4 as platinum source. The resulting composite Pt/TiO2-MCM-48 (1 wt% Pt, ca. 3 wt% Ti) was characterized using XRD, TEM, nitrogen physisorption, hydrogen chemisorption, UV-vis spectroscopy, and XPS; its catalytic activity for CO oxidation was also explored. These data were compared with those of Pt/MCM-48 prepared via an analogous route. The results reveal that the platinum was deposited inside the intact pore system in both cases. It remains inside upon mild reduction but tends to segregate out of the pore system at higher reduction temperatures or during CO oxidation. Both composites were found to be highly active in CO oxidation, with 50% conversion at 460-475 K after activation of the unreduced catalysts in the (net oxidizing) feed. Striking differences in this activation process between Pt/MCM-48 and Pt/TiO2-MCM-48 suggest that the precursor reduction is influenced by an interaction with the TiO2 component in the latter.
机译：TiO2和Pt纳米颗粒通过使用（NH4）（2）PtCl4作为铂源的连续初期湿法浸渍法沉积在硅质MCM-48的通道中。使用XRD，TEM，氮物理吸附，氢化学吸附，UV-可见光谱和XPS对所得的复合Pt / TiO2-MCM-48（1 wt％Pt，约3 wt％Ti）进行表征。还探讨了其对CO氧化的催化活性。将这些数据与通过类似途径制备的Pt / MCM-48的数据进行比较。结果表明，两种情况下铂均沉积在完整的孔系统内部。它在轻度还原后仍保留在内部，但在较高还原温度下或在CO氧化过程中倾向于从孔系统中析出。发现这两种复合材料在CO氧化中均具有很高的活性，在（净氧化）进料中未还原的催化剂活化后，在460-475 K时有50％的转化率。 Pt / MCM-48和Pt / TiO2-MCM-48在此活化过程中的显着差异表明，前体还原受与后者中TiO2组分的相互作用影响。

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