Coordination,atom reorganization,and catalysis of palladium in zeolite cages

Zeolite encaged palladium clusters undergo thorough atomic reorganizations when exposed to an adsorptive such as carbon monoxide or when used as catalysts e.g. in CO hydrogenation. Exposure to carbon monoxide of metal particles, which are initially anchored to zeolite walls via proton bridges, transforms the metal clusters into small, highly mobile carbonyl clusters. They coalesce and form larger clusters. At low temperature, this process is limited by the geometric constraints of the cage windows. At higher temperatures, further growth of metal particles occurs, conceivably via partial destruction of the zeolite matrix. The interaction of the metal particles with zeolite protons gives rise to electrondeficient metal clusters, which catalyze neopentane at a much higher rate than neutral metal particles. Such clusters might also act as collapsed bifunctional sites in bifunctional catalysis.     

用长期资产适合率分析煤炭企业偿债能力

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火灾预警系统的应用现状与发展趋势

随着科技不断发展,火灾预警系统技术取得了较大的发展,但仍有值得改善的地方。文章调研了建筑电气的火灾预警系统发展现状,介绍了火灾预警系统的关键技术,总结了火灾预警系统的几种典型应用,最后展望火灾预警系统的未来发展趋势。     

基于面向对象方法的监控画面设计

以安钢炼铁厂2200m3高炉喷煤工程为例,介绍了面向对象方法在Monitor Pro 7.2(MP72)设计中的具体应用,将先进的面向对象的思想融入工业控制软件开发,为同类型软件设计提供了借鉴.