Low-temperature water-gas shift reaction on Au/alpha-Fe2O3 catalyst
Low-temperature water-gas shift reaction on Au/alpha-Fe2O3 catalyst
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DOI：
10.1016/0926-860x(95)00208-1
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发表时间：
1996-01-18
影响因子：
5.5
通讯作者：
Giovanoli, R
中科院分区：
文献类型：
--
作者：
Andreeva, D;Idakiev, V;Giovanoli, R
研究了Au/α-Fe_2 O_3催化剂上的水煤气变换反应。用TEM、X射线衍射、差热分析、傅立叶变换红外光谱等化学和物理方法研究了样品的结构。与纯α-Fe 2 O相比，金颗粒的高分散度和Au/α-Fe 2 O 3上的羟基浓度增加。所得结果可以用WGSR的缔合机理来解释。基本方面是水的解离吸附在超细金颗粒上，然后通过溢出的活性羟基到相邻网站的氧化铁。中间物种的形成和分解伴随着Fe 3 O 4中Fe 3 + Fe 2+的氧化还原转移。
The water-gas shift reaction (WGSR) has been studied on Au/alpha-Fe2O3 catalyst. The structure of the samples has been investigated by chemical and physical methods - TEM, X-ray, DTA, FTIR. A high dispersion degree of the gold particles and an increased concentration of the hydroxyl groups on Au/alpha-Fe2O3 has been established in comparison to the pure alpha-Fe2O. The results obtained can be explained on the basis of the associative mechanism of the WGSR. The essential aspects are the dissociative adsorption of water on ultrafine gold particles, followed by spillover of active hydroxyl groups onto adjacent sites of the ferric oxide. The formation and decomposition of intermediate species is accompanied by redox transfer Fe3+ Fe2+ in Fe3O4.