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Size Regulation of Platinum Nanoparticles by Using Confined Spaces for the Low-Temperature Oxidation of Ethylene
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02988 Yu Kou 1 , Lin-Bing Sun 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02988 Yu Kou 1 , Lin-Bing Sun 1
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Noble-metal nanoparticles have attracted great attention because of their excellent catalytic activity. However, the activity of noble-metal nanoparticles is severely dependent on the size of the metal nanoparticles. Therefore, regulation of the nanoparticle size is of great importance. Herein we report an efficient strategy for the first time to regulate the size of platinum (Pt) nanoparticles in a typical mesoporous silica SBA-15 by using the confined spaces. The Pt-containing precursor is introduced to the confined spaces between the template and silica walls in as-prepared SBA-15 by grinding. Subsequent calcination allows template removal and precursor conversion in one step and avoids repeated calcination in conventional modification processes. This leads to the formation of Pt nanoparticles with smaller size, making Pt metal catalysts highly active. Hence, the catalytic activity of the oxidation of trace ethylene is very superior to that of those prepared by the conventional method. For a typical material, PtAS-5, containing 5.0 wt % Pt, the complete conversion of ethylene was achieved at 40 °C, which is lower than that on the catalyst PtCS-5 prepared by the conventional method (50 °C) as well as that on a series of catalysts reported previously.
中文翻译：
利用有限空间进行乙烯低温氧化的铂纳米颗粒尺寸调控
贵金属纳米颗粒由于其出色的催化活性而备受关注。然而，贵金属纳米颗粒的活性严重取决于金属纳米颗粒的尺寸。因此，调节纳米颗粒的尺寸非常重要。本文中，我们首次报告了一种有效的策略，即通过使用受限空间来调节典型中孔二氧化硅SBA-15中铂（Pt）纳米粒子的尺寸。通过研磨将含Pt的前体引入到制备的SBA-15中的模板和二氧化硅壁之间的狭窄空间中。随后的煅烧可一步完成模板的去除和前体转化，并避免了传统改性工艺中的重复煅烧。这导致形成了尺寸更小的Pt纳米颗粒，使Pt金属催化剂具有很高的活性。因此，痕量乙烯的氧化催化活性非常优于通过常规方法制备的那些。对于包含5.0 wt％Pt的典型材料PtAS-5，乙烯在40°C时的完全转化率要比通过常规方法（50°C）制备的催化剂PtCS-5的转化率还要低。就像之前报道的一系列催化剂一样。
更新日期：2018-01-10
中文翻译：
利用有限空间进行乙烯低温氧化的铂纳米颗粒尺寸调控
贵金属纳米颗粒由于其出色的催化活性而备受关注。然而，贵金属纳米颗粒的活性严重取决于金属纳米颗粒的尺寸。因此，调节纳米颗粒的尺寸非常重要。本文中，我们首次报告了一种有效的策略，即通过使用受限空间来调节典型中孔二氧化硅SBA-15中铂（Pt）纳米粒子的尺寸。通过研磨将含Pt的前体引入到制备的SBA-15中的模板和二氧化硅壁之间的狭窄空间中。随后的煅烧可一步完成模板的去除和前体转化，并避免了传统改性工艺中的重复煅烧。这导致形成了尺寸更小的Pt纳米颗粒，使Pt金属催化剂具有很高的活性。因此，痕量乙烯的氧化催化活性非常优于通过常规方法制备的那些。对于包含5.0 wt％Pt的典型材料PtAS-5，乙烯在40°C时的完全转化率要比通过常规方法（50°C）制备的催化剂PtCS-5的转化率还要低。就像之前报道的一系列催化剂一样。
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