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首页> 外文期刊>Catalysis science & technology >Unique reaction mechanism of preferential oxidation of CO over intermetallic Pt3Co catalysts: surface-OH-mediated formation of a bicarbonate intermediate
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Unique reaction mechanism of preferential oxidation of CO over intermetallic Pt3Co catalysts: surface-OH-mediated formation of a bicarbonate intermediate

机译：优惠的独特反应机理公司在金属间化合物氧化Pt3Co催化剂:surface-OH-mediated形成的碳酸氢盐中间

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摘要

A mechanistic study was performed regarding the preferential oxidation of CO in excess H-2 (PROX) over a Pt3Co intermetallic compound supported on various metal oxides (Pt3Co/MOx: MOx = SiO2, Al2O3, MgO, CaO, and La2O3). The Pt3Co/MgO catalyst exhibited the highest catalytic activity (97% CO conversion at 100 degrees C). CO chemisorption analysis revealed that (1) the Pt dispersion differed depending on the nature of the support and preparation conditions, and (2) the catalytic activity strongly depended on the Pt dispersion but not on the acid-base properties of the support. The kinetic study suggested that CO and O-2 adsorbed competitively on Co sites. In situ Fourier transform infrared analysis using D-2 indicated that, at a low temperature (80 degrees C), gas phase H-2 is likely to participate in the formation of the bicarbonate-like intermediate. This study provides the first spectroscopic evidence of bicarbonate formation as an intermediate and the contribution of surface hydroxyl groups toward catalysis. The proposed reaction mechanism based on bicarbonate formation is unique compared with those reported for other PROX systems.
机译：一种机械的研究是关于执行优惠CO氧化超过2 (PROX)在Pt3Co金属互化物的支持各种金属氧化物(Pt3Co /氧化物:氧化物=二氧化硅采用氧化铝,曹,La2O3)。催化剂表现出催化活性最高在100摄氏度)(97%股份转换。有限公司化学吸收作用分析表明,(1)工党分散根据不同的性质的支持和准备条件,(2)催化活性强烈依赖Pt分散但不是酸碱性质的支持。CO和o2吸附在公司网站上有竞争力。原位傅里叶变换红外分析使用d2的表明,低温( 80摄氏度),2可能参与的形成bicarbonate-like中间。提供第一光谱的证据重碳酸盐形成一个中间和贡献的表面羟基的方向催化。相比之下,重碳酸盐形成是独特的这些报道其他PROX系统。

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