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

Autor:	Doering M; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany.; Laboratory for Electrical Instrumentation and Embedded Systems, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany., Trinkies LL; Institute of Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany., Kieninger J; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany.; Laboratory for Electrical Instrumentation and Embedded Systems, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany., Kraut M; Institute of Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany., Rupitsch SJ; Laboratory for Electrical Instrumentation and Embedded Systems, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany., Dittmeyer R; Institute of Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany., Urban GA; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany., Weltin A; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany.; Laboratory for Electrical Instrumentation and Embedded Systems, IMTEK - Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2024 Apr 16; Vol. 9 (17), pp. 19700-19711. Date of Electronic Publication: 2024 Apr 16 (Print Publication: 2024).
DOI:	10.1021/acsomega.4c02210
Abstrakt:	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. Competing Interests: The authors declare no competing financial interest. (© 2024 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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