Investigation of mass transport processes in a microstructured membrane reactor for the direct synthesis of hydrogen peroxide

Trinkies, Laura L.; Düll, Andrea; Zhang, Jinju; Urban, Sebastian; Deschner, Benedikt J.; Kraut, Manfred; Ladewig, Bradley P.; Weltin, Andreas; Kieninger, Jochen; Dittmeyer, Roland

doi:10.1016/j.ces.2021.117145

Cited by 2 publications

(1 citation statement)

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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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Section: Microreactor Development: Concept and Requirementsmentioning

confidence: 99%