Effective Utilization of the Catalytically Active Phase: NH3 Oxidation Over Unsupported and Supported Co3O4
Effective Utilization of the Catalytically Active Phase: NH3 Oxidation Over Unsupported and Supported Co3O4
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DOI：
10.1007/s10562-012-0790-8
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发表时间：
2012-04-01
影响因子：
2.8
通讯作者：
van Steen, E.
中科院分区：
文献类型：
--
作者：
Fung, W. -K.;Claeys, M.;van Steen, E.
研究了无载体和二氧化硅负载的Co3O4颗粒在氨氧化中的性能随粒度的变化，以研究这些材料中催化活性相的利用率。在二氧化硅负载的Co3O4上的氨转化率方面获得的活性比在未负载的Co3O4上的转化率更高，尽管钴氧化物负载量更低并且扩散限制更严重。二氧化硅负载的催化剂的有效因子略低于类似尺寸的粒料形式的未负载的催化剂的有效因子。然而，对于二氧化硅负载的催化剂，钴在催化剂内的有效利用率较高，这主要是由于催化活性相的较高分散性。
The performance of pellets of unsupported and silica-supported Co3O4 in the ammonia oxidation was investigated as a function of the particle size to investigate the utilization of the catalytically active phase in these materials. The obtained activity in terms of ammonia conversion over the silica-supported Co3O4 is higher compared to the conversion over the unsupported Co3O4, despite a lower cobalt oxide loading and more severe diffusional limitations. The effectiveness factor for the silica-supported catalyst is slightly lower than the effectiveness factor for the unsupported catalyst in the form of pellets of similar size. However, the effective utilization of cobalt within the catalyst is higher for the silica-supported catalyst, mainly due to the higher dispersion of the catalytically active phase.