Surface-modified advanced hydrogen storage alloys for hydrogen separation and purification

Lototsky, M.V.; Williams, M.; Yartys, V.A.; Klochko, Yevgeniy; Linkov, Vladimir

doi:10.1016/j.jallcom.2010.09.206

Cited by 56 publications

(29 citation statements)

References 25 publications

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“…At the same time, the gases associated with processing of coal, petrol, natural gas and other carbonaceous/fossil fuels feedstock, in addition to hydrogen, may contain significant amounts of other components, mainly carbon dioxide and monoxide, which in most cases cause the deterioration of hydrogen sorption performances of metal hydrides (MHs) [5,6]. 2 Earlier the authors reported on the improvement of activation performances and poisoning tolerance of AB 5 -type hydride-forming materials surface-modified by fluorination and/or electroless deposition of metals (including Pd), possessing high catalytic activity towards the dissociative H 2 chemisorptive process [7]. The development of a prototype H 2 separation and purification system based on the advanced MH materials [8] successfully demonstrated its feasibility for H 2 separation from gas mixtures containing CO 2 and CO.…”

Section: Introductionmentioning

confidence: 99%

Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide

Lototskyy

Modibane

Williams

et al. 2013

Journal of Alloys and Compounds

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Lototskyy, M. et al. (2013). Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide. AbstractApplication of surface-modified MH material for H2 separation using temperature/pressure swing absorption-desorption was studied. The substrate alloy had the following composition LaNi3.55Co0.75Al0.4-Mn0.3, and the surface modification was carried out through fluorination followed by aminosilane functionalization and electroless deposition of Pd. The material was found to have good poisoning tolerance towards surface adsorbates, even for the large (rv1.5 kg) batches. Feasibility of its application for H2 separation from gas mixtures (up to 30% CO2 and 100 ppm CO) was demonstrated by testing of a prototype H2 separation system (rv280 g of MH in two reactors), and H2 separation reactor (0.75 kg of MH). The H2 separation was characterized by stable performances in the duration of 250 absorption/desorption cycles. However, the total process productivity was found to be limited by the sluggish H2 absorption (partial H2 pressure 62.5 bar, temperature below 100 °C). In the presence of CO2 and CO, additional deceleration of H2 absorption was observed at space velocities of the feed gas below 5000 h 1. Introduction Selectivity of reversible hydrogen interaction with hydride-forming materials allows for the development of simple and efficient pressure/temperature swing absorptiondesorption systems for hydrogen separation from complex gas mixtures and its fine purification [1,2]. However, so far, this approach was successfully implemented only for hydrogen-rich feed gases (vent streams in the ammonia synthesis loop, H 2 > 50%) which contain relatively innocuous admixtures, mainly nitrogen and argon [3,4]. At the same time, the gases associated with processing of coal, petrol, natural gas and other carbonaceous/fossil fuels feedstock, in addition to hydrogen, may contain significant amounts of other components, mainly carbon dioxide and monoxide, which in most cases cause the deterioration of hydrogen sorption performances of metal hydrides (MHs) [5,6].

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Section: Introductionmentioning

confidence: 99%

Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide

Lototskyy

Modibane

Williams

et al. 2013

Journal of Alloys and Compounds

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“…The corresponding surface modification procedures for the preparation of the advanced materials were developed [29,30], and feasibility of their application for hydrogen purification from (CO 2 þ CO)-containing gases was demonstrated [31,32]. The novel features of the developed surface modification procedures include (i) enhancement of PGM deposition by surface functionalisation of the metallic hydride-forming material [25,28,29], and (ii) combination of fluorination and enhanced PGM deposition procedures [24,28,30].…”

Section: Introductionmentioning

confidence: 99%

“…The fluorination and autocatalytic deposition of Pd were applied to w300 g batch of the La(Ni,Co,Al,Mn) 5 substrate. Further details on the surface modification procedure and characterisation (including activation performances) of the surface-modified materials can be found elsewhere [21,24,28,30,32].…”

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“…Kinetics of hydrogen absorption from pure H 2 and gas mixtures by MH material, in a running flow mode, was studied using procedures similar to one reported earlier [28,31]. The MH material (m w 4 g) was loaded in the running-flow tubular reactor (internal diameter e 10 mm).…”

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“…http://repository.uwc.ac.za 9 In doing so, the electroless deposition of Pd onto fluorinated AB 5 material results in the "plugging" of micro-cavities in the fluoride layer by Pd nanoparticles that, in turn, results in the improvement of hydrogen absorption performances and poisoning tolerance of the surface-odified material [24,28].…”

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Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures

Modibane

Williams

Lototskyy

et al. 2013

International Journal of Hydrogen Energy

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Modibane, K.D. et al. (2013). Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures. AbstractMetal hydride materials offer attractive solutions in addressing problems associated with hydrogen separation and purification from waste flue gases. However, a challenging problem is the deterioration of hydrogen charging performances resulting from the surface chemical action of electrophilic gases. In this work, the feasibility study of poisoning tolerance of surface modified AB5-type hydride forming materials and their application for hydrogen separation from process gases containing carbon dioxide and monoxide was carried out. Target composition of La(Ni,Co,Mn,Al)5 substrate was chosen to provide maximum reversible hydrogen capacity at the process conditions. The selected substrate alloy has been shown to be effectively surface-modified by fluorination followed by electroless deposition of palladium. The surface-modified material exhibited good coating quality, high cycle stability and minimal deterioration of kinetics of selective hydrogen absorption at room temperature, from gas mixtures containing 10% CO2 and up to 100 ppm CO. The experimental prototype of a hydrogen separation unit, based on the surfacemodified metal hydride material, was tested and exhibited stable hydrogen separation and purification performances when exposed to feedstocks containing concentrations of CO21. Introduction Metal hydride (MH) materials have found a number of promising gas-phase applications in processes of considerable economic potential, such as hydrogen storage, separation and recovery, thermally-driven compressors and heat pumps, etc. [1e3]. These materials exhibit a favourable combination of their properties, including reversibility and selectivity of interaction with H 2 gas at mild conditions, high volumetric density of hydrogen in the solid, significant heat effects in the course of hydrogenation/dehydrogenation. Thus they are very flexible in the applications, and often allow to develop multifunctional facilities (e.g., for hydrogen storage, purification and controlled supply) which offer to an end-user safe, efficient and cost-saving solutions [4].

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Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole

Wang

Shen

et al. 2015

J Solid State Electrochem

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Surface-modified advanced hydrogen storage alloys for hydrogen separation and purification

Cited by 56 publications

References 25 publications

Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide

Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide

Poisoning-tolerant metal hydride materials and their application for hydrogen separation from CO2/CO containing gas mixtures

Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole

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