Kontinuierliche Cofällung von Katalysatoren in einem Mikromischer: nanostrukturierte Cu/ZnO‐Komposite für die Methanolsynthese

Abstract

Vollkatalysatoren ohne Träger sind unverzichtbare Materialien in der Produktion von Basischemikalien. Zur Niederdruck-Synthese von Methanol wird ein System Cu/ZnO genutzt, [1][2][3] das durch Promotoren wie Al wesentlich verbessert wird. Die Materialien werden durch Cofällung einer Hydroxy-Carbonat(HK)-Vorstufe und deren Calcinierung zu CuO/ZnO hergestellt. [4,5] Die Eigenschaften der aktivierten Katalysatoren werden von den kinetischen Details der Festkörperbildung, d. h. von den Eigenschaften der Vorstufe HK, bestimmt; [3,[5][6][7]

Nanocatalysis: Mature Science Revisited or Something Really New?

“…Higher hierarchies of structural control were successfully controlled in a more simple co-precipitated copper-zinc oxide system. [123,124] The multidimensional structural definition may be achieved if the system is under complete kinetic control in all fabrication steps. Figure 8 illustrates clearly that this is not possible with a sequential experimentation strategy, although it covers all non-thermal synthesis steps.…”

A Novel Synthesis Route for Cu/ZnO/Al2O3 Catalysts used in Methanol Synthesis: Combining Continuous Consecutive Precipitation with Continuous Aging of the Precipitate

“…[16][17][18][19] For the binary Cu/ZnO catalyst, the use of a micromixer as continuous precipitation reactor proved to be a promising synthesis route. [20] The advantage of performing the aging process in a tubular reactor is the sharp residence time distribution, which only depends on the length of the aging module, that is, it is the same for every single particle of the precipitate.…”

Copper/Zinc L‐Tartrates: Mixed Crystals and Thermolysis to a Mixture of Copper Oxide and Zinc Oxide That Is Catalytically Active in Methanol Synthesis

“…Even then, the thermolysis temperature and pressure, the reduction temperature and the composition remain important external factors. [3][4][5]7,9,11,12,16] In the case of dinuclear complexes that contain both copper and zinc, the thermolysis is always complex due to the decomposition of the corresponding anions. [17,18] It was our goal to find a precursor parallel reactor.…”

“…[2][3][4][5][6][7][8] These oxide composites are usually prepared by thermolysis of co-precipitated hydroxycarbonate precatalysts in which all three metals are present. [9] Despite numerous experimental and theoretical studies, the catalytic processes on the surface of the bulk catalysts are not yet fully understood. [9][10][11][12][13][14][15] The activities of the obtained catalysts depend on many factors.…”

“…[9] Despite numerous experimental and theoretical studies, the catalytic processes on the surface of the bulk catalysts are not yet fully understood. [9][10][11][12][13][14][15] The activities of the obtained catalysts depend on many factors. To reduce the number of factors that influence the performance of the catalyst, the catalytic system is often limited to the system Cu/ZnO.…”