ChemCatChem
ChemCatChem
4 years ago

Molecular precursors for tailoring humidity tolerance of nanoscale Hopcalite catalysts via flame spray pyrolysis

Julia Grothe, Karl Wegner, Rene Zippel, Maximlian Medicus, Elke schade, Stefan Kaskel
A systematic investigation of copper‐ and manganese‐carboxylate precursors derived from various organic acids (arylcarboxylate, alkylcarboxyate) and their transformation into copper manganese oxide nanoparticles via flame spray pyrolysis (FSP) reveals significant impact on their physical and catalytic properties. A sodium‐free protocol is essential to achieve high purity copper(II) and manganese(II) 2‐ethylhexanoates, benzoates, 1‐naphthenates and 9‐ anthracenates as revealed by infrared spectroscopy (IR) and thermogravimetry (TG). It was found that especially aromatic precursors lead to smaller nanoparticles with high surface areas up to 180 m²g‐1 and that these also have a higher carbon content. In catalytic CO oxidation, all samples synthesized from organometallic precursors have shown higher CO conversions at room temperature under dry conditions and improved long‐term stability under wet conditions compared to a commercial reference. The activity depends mainly on the Cu:Mn ratio and the specific surface area. At room temperature under dry conditions, catalytic CO conversion exceeding 80 % could be achieved. A decreased deactivation rate under humid conditions could be related to an increased carbon content of the nanocatalysts. By optimization of the synthesis parameters, it was possible to show that flame spray provides more active Hopcalite catalysts than alternative synthesis methods.

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/cctc.201900990

DOI: 10.1002/cctc.201900990

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