Active states of gold in small and big metal particles in CO and methanol selective oxidation

A.N. Pestryakov; V.V. Lunin; N. Bogdanchikova; O.N. Temkin; E. Smolentseva

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Active states of gold in small and big metal particles in CO and methanol selective oxidation

机译：CO和甲醇选择性氧化中大小金属颗粒中金的活性态

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Role of small and big gold particles in CO oxidation and methanol selective oxidation to formaldehyde has been studied by the methods of diffuse reflectance electron spectroscopy, XRD, XPS, HRTEM and catalytic testing. By comparison of catalytic and spectroscopic data it was concluded that states Au~(δ+) with certain effective charge (δ ＜ 1) are active sites in low-temperature CO oxidation as well as in alcohol partial oxidation. These states can be formed under the action of different factors, such as metal-support interaction, redox treatments, and modifying additives. Modifiers stabilizing the ionic states of gold (Ce and Zr oxides) increase the selectivity of the catalyst in alcohol partial oxidation, whereas electron-releasing additions (La and Cs oxides) impair the catalyst properties.

机译：通过漫反射电子光谱，XRD，XPS，HRTEM和催化测试等方法研究了大大小的金颗粒在CO氧化和甲醇选择性氧化成甲醛中的作用。通过催化和光谱数据的比较得出结论，具有一定有效电荷（δ＜1）的Au〜（δ+）状态是低温CO氧化以及醇部分氧化的活性中心。这些状态可以在不同因素的作用下形成，例如金属-载体相互作用，氧化还原处理和改性添加剂。稳定金离子态的改性剂（Ce和Zr氧化物）提高了催化剂在醇部分氧化中的选择性，而释放电子的添加剂（La和Cs氧化物）则损害了催化剂的性能。

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来源
《Fuel》 |2013年第8期|48-53|共6页
作者
A.N. Pestryakov; V.V. Lunin; N. Bogdanchikova; O.N. Temkin; E. Smolentseva;
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作者单位

Tomsk Polytechnic University, Tomsk 634050, Russia;

Chemistry Department, Moscow State University, Moscow 119899, Russia;

Centro de Nanociencias y Nanotecnologia, Universidad National Autonoma de Mexico, Ensenada 22800, Mexico;

Lomonosov Fine Chemical Technology University, Moscow 177571, Russia;

Centro de Nanociencias y Nanotecnologia, Universidad National Autonoma de Mexico, Ensenada 22800, Mexico;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Gold catalysts; CO oxidation; Methanol oxidation; Active sites;

机译：金催化剂;一氧化碳甲醇氧化;活动网站;

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Active states of gold in small and big metal particles in CO and methanol selective oxidation

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