Micro and micro membrane reactors for advanced applications in chemical energy conversion

Dittmeyer, Roland; Boeltken, Tim; Piermartini, Paolo; Selinsek, Manuel; Loewert, Marcel; Dallmann, F.; Kreuder, H.; Cholewa, Martin; Wunsch, A.; Belimov, Michael; Farsi, Sarvenaz; Pfeifer, Peter

doi:10.1016/j.coche.2017.08.001

Cited by 41 publications

(26 citation statements)

References 32 publications

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“…Energies 2018, 11,2045 3 of 31 a reforming system [41,42]. It is therefore necessary to explore how to achieve the rapid production of hydrogen from methane steam reforming by means of process intensification.…”

Section: R E T R a C T E Dmentioning

confidence: 99%

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

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This paper addresses the issues related to the rapid production of hydrogen from methane steam reforming by means of process intensification. Methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen was investigated numerically. The effect of the catalyst, flow arrangement, and reactor dimension was assessed to optimize the design of the system. The thermal interaction between reforming and combustion was investigated for the purpose of the rapid production of hydrogen. The importance of thermal management was discussed in detail, and a theoretical analysis was made on the transport phenomena during each of the reforming and combustion processes. The results indicated that the design of a thermally integrated system operated at millisecond contact times is feasible. The design benefits from the miniaturization of the reactors, but the improvement in catalyst performance is also required to ensure the rapid production of hydrogen, especially for the reforming process. The efficiency of heat exchange can be greatly improved by decreasing the gap distance. The flow rates should be well designed on both sides of the reactor to meet the requirements of both materials and combustion stability. The flow arrangement plays a vital role in the operation of the thermally integrated reactor, and the design in a parallel-flow heat exchanger is preferred to optimize the distribution of energy in the system. The catalyst loading is an important design parameter to optimize reactor performance and must be carefully designed. Finally, engineering maps were constructed to design thermally integrated devices with desired power, and operating windows were also determined.

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Section: R E T R a C T E Dmentioning

confidence: 99%

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

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“…Additionally, the small interior dimensions of microstructured devices enable a broad scalability of the overall process that is not accessible with conventional solutions-decentralized small-scale applications become cost-competitive due to reduced transport distances. Advantages also include improved reaction safety through small reaction inventory [6,11,66].…”

Section: Microstructured Reactor Technologymentioning

confidence: 99%

Dynamically Operated Fischer-Tropsch Synthesis in PtL-Part 1: System Response on Intermittent Feed

Loewert

Pfeifer

2020

ChemEngineering

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Society is facing serious challenges to reduce CO2 emissions. Effective change requires the use of advanced chemical catalyst and reactor systems to utilize renewable feedstocks. One pathway to long-term energy storage is its transformation into high quality, low-emission and CO2-neutral fuels. Performance of technologies such as the Fischer-Tropsch reaction can be maximized using the inherent advantages of microstructured packed bed reactors. Advantages arise not only from high conversion and productivity, but from its capability to resolve the natural fluctuation of renewable sources. This work highlights and evaluates a system for dynamic feed gas and temperature changes in a pilot scale Fischer-Tropsch synthesis unit for up to 7 L of product per day. Dead times were determined for non-reactive and reactive mode at individual positions in the setup. Oscillating conditions were applied to investigate responses with regard to gaseous and liquid products. The system was stable at short cycle times of 8 min. Neither of the periodic changes showed negative effects on the process performance. Findings even suggest this technology’s capability for effective, small-to-medium-scale applications with periodically changing process parameters. The second part of this work focuses on the application of a real-time photovoltaics profile to the given system.

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“…Temperature profile for 16 measurement spots in four thermocouple channels for a non‐insulated (a) and an insulated microstructured pilot‐scale FT reactor (b), as described in .…”

Section: Resultsmentioning

confidence: 99%

Microstructured Fischer‐Tropsch Reactor Scale‐up and Opportunities for Decentralized Application

et al. 2019

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Current projects focusing on the energy transition in traffic will rely on a high‐level technology mix for their commissioning. One of those technologies is the Fischer‐Tropsch synthesis (FTS) that converts synthesis gas into hydrocarbons of different chain lengths. A microstructured packed‐bed reactor for low‐temperature FTS is tested towards its versatility for biomass‐based syngas with a high inert gas dilution. Investigations include overall productivity, conversion, and product selectivity. A 60‐times larger pilot‐scale reactor is further tested. Evaporation cooling is introduced which allows to increase the available energy extraction from the system. From that scale on, an autothermal operation at elevated conversion levels is applicable.

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Micro and micro membrane reactors for advanced applications in chemical energy conversion

Cited by 41 publications

References 32 publications

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

Dynamically Operated Fischer-Tropsch Synthesis in PtL-Part 1: System Response on Intermittent Feed

Microstructured Fischer‐Tropsch Reactor Scale‐up and Opportunities for Decentralized Application

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