The Evaluation of Synthesis Route Impact on Structure, Morphology and LT-WGS Activity of Cu/ZnO/Al2O3 catalysts

Kowalik, Paweł; Antoniak‐Jurak, Katarzyna; Próchniak, Wiesław; Wiercioch, Paweł; Konkol, Marcin; Bicki, Robert; Michalska, Kamila; Walczak, Michał

doi:10.1007/s10562-017-2048-y

Cited by 17 publications

(9 citation statements)

References 55 publications

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“…After initial precipitation, the suspension passed through an extension section bathing in water at 80°C. The pH value was adjusted to 6.9–7.1 by regulating the relative flow rates of reactant solutions 29 …”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

Jiang

Chen

et al. 2021

AIChE Journal

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The enhancement of turbulence was considered to be able to bring about better mixing and more uniform distribution of concentration generally, but its influence on ultrafast competitive reactions is an open question. Cu‐Zn co‐precipitation was carried out in three types of micro‐reactors and the turbulent intensity was regulated by changing flow rate and ultrasound power, respectively. Energy‐dispersive spectrometer of precipitates and characteristic aging time indicate the best uniformity of Cu‐Zn distribution in precipitates appears at moderate turbulent intensity. The numerical simulation shows the uniformities of precipitation both in time and in space are impacted by mixing simultaneously but with opposite direction, resulting in the appearance of maximum. The unevenness of Cu‐Zn distribution caused by inconsistent reaction rates along the time will be erased during subsequent structural evolution, while that caused by diverse reaction rates at various positions can survive and further affect the structure and performance of catalysts.

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Section: Experimental Methodsmentioning

confidence: 99%

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

Jiang

Chen

et al. 2021

AIChE Journal

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“…In recent years, the water gas shift (WGS) reaction has attracted considerable attention because it provides an effective approach for the preparation and purification of hydrogen ,, as a process to remove trace amounts of CO in proton-exchange membrane fuel cells. ,, Many catalysts such as Au, ,,, Pt, ,, or Cu ,,, supported on oxide supports including CeO 2 , ,, TiO 2 , − Al 2 O 3 , , and SiO 2 , have been widely studied due to their excellent catalytic activity for the WGS reaction. It was reported that a very small amount of Pt on the oxide support showed more superior catalytic activity than Cu and Au .…”

Section: Introductionmentioning

confidence: 99%

Heterostructured Ceria–Titania-Supported Platinum Catalysts for the Water Gas Shift Reaction

Lai

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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The water gas shift (WGS) reaction is a key process in the industrial hydrogen production and the development and application of the proton exchange membrane fuel cell. Metal oxide-supported highly dispersed Pt has been proved as an efficient catalyst for the WGS reaction. In this work, a series of supported 0.5Pt/xCe−10Ti (x = 1, 3, or 5) catalysts with different Ce/Ti molar ratios were prepared by a simple deposition−precipitation method. Compared with single TiO 2 -or CeO 2 -supported Pt catalysts, it was found that the 0.5Pt/3Ce−10Ti catalyst showed an obvious advantage in activity for the WGS reaction. In this catalyst, dispersed CeO 2 nanoparticles were supported on the TiO 2 sheets, and Pt single atoms and nanoparticles were located on CeO 2 and at the boundary of TiO 2 and CeO 2 , respectively. It found that the reduction ability of the supported Pt catalyst was remarkably improved; meanwhile, the adsorption strength of CO on the surface of 0.5Pt/3Ce−10Ti was moderate. The heterostructured CeO 2 −TiO 2 support gave an effective regulation on the Pt status and further influenced the CO adsorption ability, inducing excellent WGS reaction activity. This work provides a reference for the development and application of heterostructured materials in heterogeneous catalysis.

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“…Copper-zinc oxide (Cu/ZnO) catalysts are widely used by industry for various reactions, most notably for methanol synthesis and low temperature water-gas shift reaction [1][2][3][4]. Despite having been used as the industrial standard catalyst for methanol synthesis since the 1960s [5], Cu/ ZnO are still widely studied in academia and industry, with the focus on improvement in the performance of copper zinc catalysts through the preparation methods [3,6].…”

Section: Introductionmentioning

confidence: 99%

Triethylamine–Water as a Switchable Solvent for the Synthesis of Cu/ZnO Catalysts for Carbon Dioxide Hydrogenation to Methanol

Wallace

Hayward

et al. 2021

Top Catal

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Cu/ZnO catalyst precursors for industrial methanol synthesis catalysts are traditionally synthesised by coprecipitation. In this study, a new precipitation route has been investigated based on anti-solvent precipitation using a switchable solvent system of triethylamine and water. This system forms a biphasic system under a nitrogen atmosphere and can be switched to an ionic liquid single phase under a carbon dioxide atmosphere. When metal nitrate solutions were precipitated from water using triethylamine–water as the anti-solvent a hydroxynitrate phase, gerhardite, was formed, rather than the hydroxycarbonate, malachite, formed by coprecipitation. When calcined and reduced, the gerhardite precursors formed Cu/ZnO catalysts which showed better productivity for methanol synthesis from CO2 hydrogenation than a traditional malachite precursor, despite their larger CuO crystallite size determined by X-ray diffraction. The solvents could be recovered by switching to the biphasic system after precipitation, to allow solvent recycling in the process, reducing waste associated with the catalyst synthesis.

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The Evaluation of Synthesis Route Impact on Structure, Morphology and LT-WGS Activity of Cu/ZnO/Al2O3 catalysts

Cited by 17 publications

References 55 publications

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

Effect of turbulence in micro‐reactors on ultrafast competitive reactions in Cu‐Zn co‐precipitation

Heterostructured Ceria–Titania-Supported Platinum Catalysts for the Water Gas Shift Reaction

Triethylamine–Water as a Switchable Solvent for the Synthesis of Cu/ZnO Catalysts for Carbon Dioxide Hydrogenation to Methanol

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