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<p>A simple method to synthesize catalytically active, noble metal free cobalt ferrites with mesopores and high activity for CO-oxidation at low temperatures will be presented in the following work. Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub> (Prussian blue, PB) and Co<sub>3</sub>[Fe(CN)<sub>6</sub>]<sub>2</sub> (Co- Prussian blue-analogue, PBA) are first synthesized by a co-precipitation reaction and subsequently heat treated to form the catalytically active oxide CoFe<sub>2</sub>O<sub>4</sub>. Solvent modification with DMF and a salt-filler-calcination method with MgSO<sub>4</sub> will be employed for the first time to modify and protect the pore system of CoFe<sub>2</sub>O<sub>4</sub>. The as obtained mesoporous material has a specific surface area of 76 m<sup>2</sup> g<sup>− 1</sup>, pore sizes ranging from 10 to 70&#xa0;nm and a specific mesopore volume of 0.4 cm<sup>3</sup> g<sup>− 1</sup>. In a fixed bed-setup with dry air, the material shows 90% CO-conversion (T<sub>90</sub>) at room temperature. When coating the catalyst onto a honeycomb support and using moisture containing air, T<sub>90</sub> of 320&#xa0;°C can be achieved, remaining constant or increasing to 380&#xa0;°C after hydrothermal or SO<sub>2</sub>-aging respectively. Noble metal free CO-oxidation catalysts, still active after exposure to H<sub>2</sub>O and SO<sub>2</sub>, can thus be synthesized by a simple and cost-efficient method.</p> Graphical Abstract <p>CoFe<sub>2</sub>O<sub>4</sub> is prepared via Prussian Blue/Prussian Blue Analogue (PB/PBA) co-precipitation method with subsequent calcination. Mesopores within the structure are preserved by using a pore-filling salt during calcination. CoFe<sub>2</sub>O<sub>4</sub> is used as a CO-oxidation catalyst that remains active even avert exposure to water and SO<sub>2</sub>.</p> <p></p>

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Preparation of Highly Active CO-Oxidation Catalysts Based on Cobalt Prussian Blue Analogues

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月30日

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  • Tobias Günther,
  • Stephan Feser,
  • Andreas Roppertz,
  • David Poppitz,
  • Thomas Hahn,
  • Dirk Enke

摘要

A simple method to synthesize catalytically active, noble metal free cobalt ferrites with mesopores and high activity for CO-oxidation at low temperatures will be presented in the following work. Fe4[Fe(CN)6]3 (Prussian blue, PB) and Co3[Fe(CN)6]2 (Co- Prussian blue-analogue, PBA) are first synthesized by a co-precipitation reaction and subsequently heat treated to form the catalytically active oxide CoFe2O4. Solvent modification with DMF and a salt-filler-calcination method with MgSO4 will be employed for the first time to modify and protect the pore system of CoFe2O4. The as obtained mesoporous material has a specific surface area of 76 m2 g− 1, pore sizes ranging from 10 to 70 nm and a specific mesopore volume of 0.4 cm3 g− 1. In a fixed bed-setup with dry air, the material shows 90% CO-conversion (T90) at room temperature. When coating the catalyst onto a honeycomb support and using moisture containing air, T90 of 320 °C can be achieved, remaining constant or increasing to 380 °C after hydrothermal or SO2-aging respectively. Noble metal free CO-oxidation catalysts, still active after exposure to H2O and SO2, can thus be synthesized by a simple and cost-efficient method.

Graphical Abstract

CoFe2O4 is prepared via Prussian Blue/Prussian Blue Analogue (PB/PBA) co-precipitation method with subsequent calcination. Mesopores within the structure are preserved by using a pore-filling salt during calcination. CoFe2O4 is used as a CO-oxidation catalyst that remains active even avert exposure to water and SO2.