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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Improvement in the durability of carbon nanotube-supported ruthenium catalysts by coverage with silica layers
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Improvement in the durability of carbon nanotube-supported ruthenium catalysts by coverage with silica layers

机译：通过覆盖二氧化硅层来提高碳纳米管负载钌催化剂的耐久性

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摘要

Carbon nanotube-supported Ru (Ru/CNT) catalysts were covered with silica layers to inhibit the aggregation of Ru particles as well as the detachment of Ru particles from the CNTs during catalytic reactions. Coverage of the Ru/CNT with silica was performed by the successive hydrolysis of 3- aminopropyltriethoxysilane and tetraethoxysilane in the presence of CNT-supported Ru metal precursors, followed by reduction with hydrogen at 623 K. The diameter of the Ru particles in the silica-coated Ru/CNT ranged from 1 to 3 nm. The Ru particles and the CNTs in the silica-coated catalysts were uniformly covered with silica layers a few nanometers thick. The size of the Ru particles in the silica-coated catalysts did not change appreciably after treatment at 873 K, while the metal particles in the Ru/CNT were seriously aggregated after treatment at 873 K. The silica-coated Ru/CNT catalyzed the CO hydrogenation and the 1-hexene hydrogenation, despite the coverage of Ru particles with silica. In addition, the silica-coated Ru catalysts showed high durability toward Ru detachment from the CNTs during the repeated hydrogenation of 1-hexene, whereas the catalysts without silica layers were deactivated because of Ru detachment. Therefore, coverage of the Ru/CNT catalysts with silica layers prevented the deactivation of the catalysts.
机译：碳纳米管负载的Ru（Ru / CNT）催化剂上覆盖有二氧化硅层，以抑制Ru颗粒的聚集以及在催化反应过程中Ru颗粒从CNT脱离。 Ru / CNT被二氧化硅覆盖的方法是，在CNT负载的Ru金属前体存在下，将3-氨基丙基三乙氧基硅烷和四乙氧基硅烷连续水解，然后在623 K下用氢气还原。涂覆的Ru / CNT的范围为1至3nm。二氧化硅涂覆的催化剂中的Ru颗粒和CNT被几纳米厚的二氧化硅层均匀覆盖。在873 K处理后，二氧化硅包覆的催化剂中Ru颗粒的尺寸没有明显变化，而在873 K处理后Ru / CNT中的金属颗粒严重聚集。二氧化硅包覆的Ru / CNT催化了CO氢化和1-己烯氢化，尽管Ru颗粒被二氧化硅覆盖。另外，二氧化硅涂覆的Ru催化剂在1-己烯的重复氢化期间显示出对Ru从CNT脱离的高耐久性，而没有二氧化硅层的催化剂由于Ru脱离而失活。因此，Ru / CNT催化剂被二氧化硅层覆盖防止了催化剂的失活。

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