High pressure membrane separator for hydrogen purification of gas from hydrothermal treatment of biomass

Cholewa, Martin; Dürrschnabel, Robin; Boukis, Ν.; Pfeifer, Peter

doi:10.1016/j.ijhydene.2018.05.031

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…In addition, hydrogen flux reduction observed in the studied membranes under mixed gas condition may originate from the i) formation of surface carbides and/or dissolved carbon into the Pd layer and hence reducing the hydrogen solubility, ii) competitive surface adsorption of other gases and therefore blocking available sites for hydrogen adsorption and iii) a reduction in hydrogen partial pressure and hydrogen mass transport limitation known as concentration polarisation [32]- [34]. Although surface carbide formation was suggested to be favourable on the Pd surface, the formation of stable carbides seemed to be strongly temperature dependent [33].…”

Section: Methodsmentioning

confidence: 99%

Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes

Nayebossadri

Speight

Book

2019

International Journal of Hydrogen Energy

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Hydrogen separation membranes based on a heated metal foil of a palladium alloy, offer excellent permeability for hydrogen as a result of the solution-diffusion mechanism. Here, the possibility to separate hydrogen from the mixture of Natural Gas (NG) and hydrogen (NG+H 2) with various NG concentrations using Pd, PdCu 53 and PdAg 24 hydrogen purification membranes is demonstrated. Hydrogen concentrations above ~ 25% (for Pd and PdCu 53) and ~ 15% (for PdAg 24) were required for the hydrogen separation to proceed at 400 °C and 5 bar pressure differential. Hydrogen permeability of the studied alloys could be almost fully recovered after switching the feed gas to pure hydrogen, indicating no significant interaction between the natural gas components and the membranes surface at the current experimental condition. Hydrogen flux of the membranes at various pressure differential was measured and no changes in the hydrogen permeation mechanism could be noticed under (NG 50%+H 2) mixture. The hydrogen separation capability of the membranes is suggested to be mainly controlled by the operating temperature and the hydrogen partial pressure.

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Section: Methodsmentioning

confidence: 99%

Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes

Nayebossadri

Speight

Book

2019

International Journal of Hydrogen Energy

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“…Pd-based membrane reactors have already been developed for the dehydrogenation of LOHC methylcyclohexane, and the steam reforming of methane, where promising results could be achieved [3,8,9,72,73,74,75]. For adaptation to the multiphase system 18H-DBT/0H-DBT/H 2 , a multi-stage reactor concept with intermediate separation of hydrogen was developed.…”

Section: Process Intensification In Lohc Dehydrogenation Using Pd-mentioning

confidence: 99%

Recent Developments in Compact Membrane Reactors with Hydrogen Separation

et al. 2018

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Hydrogen production and storage in small and medium scale, and chemical heat storage from renewable energy, are of great interest nowadays. Micro-membrane reactors for reforming of methane, as well as for the dehydrogenation of liquid organic hydrogen carriers (LOHCs), have been developed. The systems consist of stacked plates with integrated palladium (Pd) membranes. As an alternative to rolled and electroless plated (Pd) membranes, the development of a cost-effective method for the fabrication of Pd membranes by suspension plasma spraying is presented.

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“…Micro-process engineering offers two promising approaches—the use of a micro-structured reactor allows an almost isothermal reaction environment, which prevents “cold spots” by limited heat input. Furthermore, it has already been shown that Pd-based membranes benefit from a micro-structured environment to separate hydrogen with high efficiency and purity from a gas mixture [9,10,11,12,13,14,15,16]. The combination of membrane and reaction in microreactors has been demonstrated as highly beneficial over conventional systems in these studies.…”

Section: Introductionmentioning

confidence: 99%

Intensified LOHC-Dehydrogenation Using Multi-Stage Microstructures and Pd-Based Membranes

Wunsch¹,

Mohr²,

Pfeifer³

2018

Membranes

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Liquid organic hydrogen carriers (LOHC) are able to store hydrogen stably and safely in liquid form. The carrier can be loaded or unloaded with hydrogen via catalytic reactions. However, the release reaction brings certain challenges. In addition to an enormous heat requirement, the released hydrogen is contaminated by traces of evaporated LOHC and by-products. Micro process engineering offers a promising approach to meet these challenges. In this paper, a micro-structured multi-stage reactor concept with an intermediate separation of hydrogen is presented for the application of perhydro-dibenzyltoluene dehydrogenation. Each reactor stage consists of a micro-structured radial flow reactor designed for multi-phase flow of LOHC and released hydrogen. The hydrogen is separated from the reactors’ gas phase effluent via PdAg-membranes, which are integrated into a micro-structured environment. Separate experiments were carried out to describe the kinetics of the reaction and the separation ability of the membrane. A model was developed, which was fed with these data to demonstrate the influence of intermediate separation on the efficiency of LOHC dehydrogenation.

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High pressure membrane separator for hydrogen purification of gas from hydrothermal treatment of biomass

Cited by 10 publications

References 24 publications

Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes

Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes

Recent Developments in Compact Membrane Reactors with Hydrogen Separation

Intensified LOHC-Dehydrogenation Using Multi-Stage Microstructures and Pd-Based Membranes

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