Weinberger Christian, Roggenbuck Jan, Hanss Jan, Tiemann Michael
Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn,Germany.
Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany.
Nanomaterials (Basel). 2015 Aug 28;5(3):1431-1441. doi: 10.3390/nano5031431.
A variety of metal nitrates were filled into the pores of an ordered mesoporous CMK-3 carbon matrix by solution-based impregnation. Thermal conversion of the metal nitrates into the respective metal oxides, and subsequent removal of the carbon matrix by thermal combustion, provides a versatile means to prepare mesoporous metal oxides (so-called nanocasting). This study aims to monitor the thermally induced processes by thermogravimetric analysis (TGA), coupled with mass ion detection (MS). The highly dispersed metal nitrates in the pores of the carbon matrix tend to react to the respective metal oxides at lower temperature than reported in the literature for pure, i.e., carbon-free, metal nitrates. The subsequent thermal combustion of the CMK-3 carbon matrix also occurs at lower temperature, which is explained by a catalytic effect of the metal oxides present in the pores. This catalytic effect is particularly strong for oxides of redox active metals, such as transition group VII and VIII metals (Mn, Fe, Co, Ni), Cu, and Ce.
通过基于溶液的浸渍法，将多种金属硝酸盐填充到有序介孔CMK-3碳基质的孔中。金属硝酸盐热转化为相应的金属氧化物，随后通过热燃烧去除碳基质，这提供了一种制备介孔金属氧化物的通用方法（所谓的纳米铸造）。本研究旨在通过热重分析（TGA）结合质量离子检测（MS）来监测热诱导过程。碳基质孔中高度分散的金属硝酸盐倾向于在比文献中报道的纯（即无碳）金属硝酸盐更低的温度下反应生成相应的金属氧化物。CMK-3碳基质随后的热燃烧也在较低温度下发生，这可以通过孔中存在的金属氧化物的催化作用来解释。这种催化作用对于氧化还原活性金属的氧化物尤其强烈，例如第VII和第VIII族过渡金属（Mn、Fe、Co、Ni）、Cu和Ce。
