Direct synthesis of hydrogen peroxide at additively manufactured fluid guiding elements as structured catalysts

Trinkies, Laura L.; Ng, Derrick Wing Kwan; Xie, Zhiyuan; Hornung, Christian H.; Kraut, Manfred; Dittmeyer, Roland

doi:10.1016/j.cep.2023.109353

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…Thereby, TiO2 was impregnated with an aqueous solution containing palladium (II) nitrate hydrate (Pd(NO3)2 • H2O). More details about the procedure can be found in the literature [23,24]. From a more general perspective and based on the results of a large number of gasphase experiments on CO and/or NO oxidation, it was shown that the SFRD technique leads to catalysts with higher catalytic activity compared to conventional preparation methods.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Samples of the product containing solvent were collected via a valve placed after the reactor for further analysis of the H 2 O 2 concentration by external UV-vis spectroscopy, as described in [41]. The schematic representation of the experimental setup, further details about the execution of the experiments, and the data analysis can be found in the literature [23].…”

Section: Determination Of the H 2 O 2 Productivitymentioning

confidence: 99%

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Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Crone,

Trinkies,

Dittmeyer

et al. 2024

Molecules

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In this study, we investigated the catalytic properties of mono- and bimetallic palladium (Pd) and platinum (Pt) nanoparticles deposited via supercritical fluid reactive deposition (SFRD) on titanium dioxide (TiO2) powder. Transmission electron microscopy analyses verified that SFRD experiments performed at 353 K and 15.6 MPa enabled the deposition of uniform mono- and bimetallic nanoparticles smaller than 3 nm on TiO2. Electron-dispersive X-ray spectroscopy demonstrated the formation of alloy-type structures for the bimetallic PdPt nanoparticles. H2O2 is an excellent oxidizing reagent for the production of fine and bulk chemicals. However, until today, the design and preparation of catalysts with high H2O2 selectivity and productivity remain a great challenge. The focus of this study was on answering the questions of (a) whether the catalysts produced are suitable for the direct synthesis of hydrogen peroxide (H2O2) in the liquid phase and (b) how the metal type affects the catalytic properties. It was found that the metal type (Pd or Pt) influenced the catalytic performance strongly; the mean productivity of the mono- and bimetallic catalysts decreased in the following order: Pd > PdPt > Pt. Furthermore, all catalysts prepared by SFRD showed a significantly higher mean productivity compared to the catalyst prepared by incipient wetness impregnation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Determination Of the H 2 O 2 Productivitymentioning

confidence: 99%

See 1 more Smart Citation

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Crone,

Trinkies,

Dittmeyer

et al. 2024

Molecules

Self Cite

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“…However, it is difficult to replace the catalyst in this case without replacing the entire reactor module as it might be needed, e.g., after deactivation of the catalyst. As a solution, structured catalysts were chosen for the integration of the solid catalyst in our concept , (Figures A and ). To ensure the safety of the process when contacting the reactants, membrane reactors in a distributor configuration are considered, which allow the selective supply of gaseous substances .…”

Section: Microreactor Development: Concept and Requirementsmentioning

confidence: 99%

In Situ Performance Monitoring of Electrochemical Oxygen and Hydrogen Peroxide Sensors in an Additively Manufactured Modular Microreactor

Doering,

Trinkies,

Kieninger

et al. 2024

ACS Omega

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Miniaturized and microstructured reactors in process engineering are essential for a more decentralized, flexible, sustainable, and resilient chemical production. Modern, additive manufacturing methods for metals enable complex reactor-geometries, increased functionality, and faster design iterations, a clear advantage over classical subtractive machining and polymer-based approaches. Integrated microsensors allow online, in situ process monitoring to optimize processes like the direct synthesis of hydrogen peroxide. We developed a modular tube-in-tube membrane reactor fabricated from stainless steel via 3D printing by laser powder bed fusion of metals (PBF-LB/M). The reactor concept enables the spatially separated dosage and resaturation of two gaseous reactants across a membrane into a liquid process medium. Uniquely, we integrated platinum-based electrochemical sensors for the online detection of analytes to reveal the dynamics inside the reactor. An advanced chronoamperometric protocol combined the simultaneous concentration measurement of hydrogen peroxide and oxygen with monitoring of the sensor performance and self-calibration in long-term use. We demonstrated the highly linear and sensitive monitoring of hydrogen peroxide and dissolved oxygen entering the liquid phase through the membrane. Our measurements delivered important real-time insights into the dynamics of the concentrations in the reactor, highlighting the power of electrochemical sensors applied in process engineering. We demonstrated the stable continuous measurement over 1 week and estimated the sensor lifetime for months in the acidic process medium. Our approach combines electrochemical sensors for process monitoring with advanced, additively manufactured stainless steel membrane microreactors, supporting the power of sensor-equipped microreactors as contributors to the paradigm change in process engineering and toward a greener chemistry.

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“…Therefore, the choice of catalyst is very important for the practical application of reforming reaction [8]. Catalytic system is the core of modern energy, and it is generally composed of active components, structural carrier and reactor [9][10][11][12][13][14]. In recent years, the integrated design concept of catalyst active component, structural carrier and reactor has become a c a new trend in the field of catalysis.…”

Section: Introductionmentioning

confidence: 99%

Applied research on methane steam reforming properties of porous structural catalyst fabricated by selective laser melting technology

Liang,

Wei,

Dong

et al. 2024

Mater. Res. Express

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In this paper, structured catalysts with different specific surface areas were fabricated by selective laser melting (SLM), and their catalytic properties were tested by methane steam reforming experiments. The results show that the structured catalyst prepared by SLM shows high structural stability and catalytic activity with H2 yield of 51.44% and CH4 conversion of 71.94%. The structured catalyst prepared by SLM can be impregnated with the traditional catalyst, which can improve the catalytic efficiency. After impregnation, the H2 yield and CH4 conversion rate of structured catalyst can reach 71.98%, and 99.53%, respectively. Compared with the traditional catalyst, the methane conversion rate is significantly improved. This work provides a simple and efficient manufacturing method for the functional integration of catalyst and reactor, which will promote the development of chemical synthesis and SLM.

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Direct synthesis of hydrogen peroxide at additively manufactured fluid guiding elements as structured catalysts

Cited by 5 publications

References 36 publications

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

In Situ Performance Monitoring of Electrochemical Oxygen and Hydrogen Peroxide Sensors in an Additively Manufactured Modular Microreactor

Applied research on methane steam reforming properties of porous structural catalyst fabricated by selective laser melting technology

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