Hopcalite nanoparticle catalysts with high water vapour stability for catalytic oxidation of carbon monoxide

Biemelt, Tim; Wegner, K. David; Teichert, Johannes F.; Lohe, Martin R.; Märtin, Jan; Grothe, Julia; Kaskel, Stefan

doi:10.1016/j.apcatb.2015.11.008

Cited by 56 publications

(39 citation statements)

References 22 publications

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“…Previous work has shown that the purity of the precursors used has an immense influence on the catalytic performance of the catalysts . In particular, alkaline earth metals such as sodium have negative influence leading to poisoning of the active sites .…”

Section: Resultssupporting

confidence: 85%

“…Another strategy is the synthesis of known, active materials using new processes that can accomplish more tailored product properties compared to conventional approaches. One of these methods is flame spray pyrolysis . This process is suitable for the synthesis of complex nanoscale oxides .…”

Section: Introductionmentioning

confidence: 99%

“…Based on these findings, in the following we investigate the influence of the type of precursor, in particular the chemical structure of the ligand using a predefined fixed set of flame‐operation parameters. Our earlier work has shown the negative influences of impurities such as sodium, which is present in many commercial precursors, on the catalytic properties . In order to exclude these impurities, we synthesized the targeted precursors ourselves and an alkali metal‐free process was used to avoid possible poisoning of the catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…One of these methods is flame spray pyrolysis. [28][29][30] This process is suitable for the synthesis of complex nanoscale oxides. [31][32][33][34] The synthesis is based on the combustion of metalcontaining precursors in combustible organic solvents in a defined flame.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Precursors for Tailoring Humidity Tolerance of Nanoscale Hopcalite Catalysts Via Flame Spray Pyrolysis

et al. 2019

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A systematic investigation of copper‐ and manganese‐carboxylate precursors derived from various organic acids (arylcarboxylate, alkylcarboxyate) and their transformation into copper manganese 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). In order to exclude the influence of other parameters, the FSP syntheses were carried out using fixed air/feed ratio. 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. TPR investigations have shown that the copper and manganese atoms are in close contact with each other, which significantly reduces their reduction temperature. 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 and the use of pure precursors, it was possible to show that flame spray pyrolysis is an efficient, scalable and single‐stage synthesis method for Hopcalite nanoparticles, which additionally provides more active catalysts than those from alternative synthesis methods.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Precursors for Tailoring Humidity Tolerance of Nanoscale Hopcalite Catalysts Via Flame Spray Pyrolysis

et al. 2019

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“…A co-precipitation method is used for the preparation of CuMnOx catalyst with a full range (Cu:Mn) in a CuMnOx solution, and after the precipitation conditions, the (Cu:Mn) ratio of the final catalyst is very similar to the (Cu 2+ : Mn 2+ ) ratio in the starting solutions [10,21]. There are many things, which can be varied during the catalyst preparation by co-precipitation method and the subsequent calcination step for controlling the performance of catalyst for CO oxidation [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Dey

Dhal

Прасад

2017

Bull. Chem. React. Eng. Catal.

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The hopcalite (CuMnOx) catalyst is a well-known catalyst for oxidation of CO at ambient temperature. It has prepared by co-precipitation method and the preparation parameters were like Copper/Manganese (Cu:Mn) molar ratios, drying temperature, drying time, calcination temperature and calcination time has an influence on activity of the resultant catalyst. The activity of the catalyst was measured in flowing air calcinations (FAC) conditions. The reaction temperature was increased from ambient to a higher value at which complete oxidation of CO was achieved. The particle size, weight of catalyst and CO flow rate in the air were also influenced by the activity of the catalyst for CO oxidation. The characterizations of the catalysts were done by several techniques like XRD, FTIR, BET, SEM-EDX and XPS. These results were interpreted in terms of the structure of the active catalyst. The main aim of this paper was to identify the optimum preparation conditions of CuMnOx catalyst with respect to the performance of catalyst for CO oxidation.

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Tailoring Catalytic Properties of Copper Manganese Oxide Nanoparticles (Hopcalites‐2G) via Flame Spray Pyrolysis

et al. 2018

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Humidity tolerant copper manganese oxide catalysts of the second generation (“Hopcalites‐2G”) were produced by flame spray pyrolysis process (FSP) and their catalytic activity for carbon monoxide oxidation under dry and humid conditions was evaluated. The effects of synthesis parameters such as flame specific variables (OFR=oxygen to fuel ratio, sheath gas, reactor) and the precursor specifications (composition, concentration, solvent) were investigated systematically. From the findings of the synthesis variations, it was possible to identify key factors decisive to achieve a high catalytic activity for CO oxidation under humid conditions. The most important characteristics are phase composition, specific surface area and the carbon content to achieve increased long‐term stability of the flame made catalysts under humid conditions. A high productivity in the flame‐based Hopcalite synthesis was achieved with catalysts performances similar or better than that of the commercial Hopcalite catalyst Carulite 300 (CARUS). The most active catalyst showed 50 % higher CO conversion after one hour on stream at 50 °C and humid conditions compared with the reference. The latter is a crucial step towards an improved humidity tolerance of Hopcalite catalysts in respiratory filter applications.

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Hopcalite nanoparticle catalysts with high water vapour stability for catalytic oxidation of carbon monoxide

Cited by 56 publications

References 22 publications

Molecular Precursors for Tailoring Humidity Tolerance of Nanoscale Hopcalite Catalysts Via Flame Spray Pyrolysis

Molecular Precursors for Tailoring Humidity Tolerance of Nanoscale Hopcalite Catalysts Via Flame Spray Pyrolysis

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Tailoring Catalytic Properties of Copper Manganese Oxide Nanoparticles (Hopcalites‐2G) via Flame Spray Pyrolysis

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