Dual application of Ti-catalyzed Li-RHC composite for H2 purification and CO methanation

Gamba, Nadia S.; Puszkiel, Julián Atilio; Larochette, P. Arneodo; Gennari, F.C.

doi:10.1016/j.ijhydene.2020.05.023

Cited by 4 publications

(2 citation statements)

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“…The gas-solid reaction of CO 2 with alanates was investigated by Hugelshofer et al where the authors observed the formation of intermediates like aluminum formate and methoxy compounds which then got converted into methane and metal oxides as final products [11]. The influences of gas components on other metal hydrides are well investigated [12][13][14][15][16][17][18][19][20][21][22][23][24]. In this work, the influence of different ratios of CO, CO 2 , N 2 on the hydrogen storage performance of the complex metal hydride Na 3 AlH 6 with 4 mol% TiCl 3 , 8 mol% aluminum and 8 mol% activated carbon is explored.…”

Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride

et al. 2021

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A systematic study of different ratios of CO, CO2, N2 gas components on the hydrogen storage properties of the Na3AlH6 complex hydride with 4 mol% TiCl3, 8 mol% aluminum and 8 mol% activated carbon is presented in this paper. The different concentrations of CO and CO2 in H2 and CO, CO2, N2 in H2 mixture were investigated. Both CO and CO2 gas react with the complex hydride forming Al oxy-compounds, NaOH and Na2CO3 that consequently cause serious decline in hydrogen storage capacity. These reactions lead to irreversible damage of complex hydride under the current experimental condition. Thus, after 10 cycles with 0.1 vol % CO + 99.9 vol %H2 and 1 vol % CO + 99 vol %H2, the dehydrogenation storage capacity of the composite material decreased by 17.2% and 57.3%, respectively. In the case of investigation of 10 cycles with 1 vol % CO2 + 99 vol % H2 gas mixture, the capacity degradation was 53.5%. After 2 cycles with 10 vol % CO +90 vol % H2, full degradation was observed, whereas after 6 cycles with 10 vol % CO2 + 90 vol % H2, degradation of 86.8% was measured. While testing with the gas mixture of 1.5 vol % CO + 10 vol % CO2 + 27 vol % H2 + 61.5 vol % N2, the degradation of 94% after 6 cycles was shown. According to these results, it must be concluded that complex aluminum hydrides cannot be used for the absorption of hydrogen from syngas mixtures without thorough purification.

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Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride

et al. 2021

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“…Based on the shifts from XRD and FTIR results, we speculate that Li-N-H-Cl could be formed after the reaction by combining the shifts of XRD and FTIR results, which was reported in a previous work and improved the hydrogen storage kinetic and thermodynamic properties of the Li-N-H system. 47,48 ECLAS over LiH. To accomplish the ECLAS cycle over Li 2 NH/LiH, we also performed an electrochemical N 2 fixation on 5 wt % LiH-LNK at a continuous flow of N 2 (15 mL min −1 ) and at a potential of 1.75 V. The tail gas was detected by an online mass spectrum (MS), and the results of the MS signal are shown in Figure 4a.…”

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confidence: 99%

Electrodriven Chemical Looping Ammonia Synthesis Mediated by Lithium Imide

et al. 2023

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The chemical looping process for ammonia synthesis (CLAS) has advantages in avoiding competitive adsorptions of nitrogen and hydrogen and optimizing the thermodynamics and kinetics of a reaction step by step. Nitrogen carriers with favorable thermodynamic and kinetic properties are critical for such a process, especially under mild conditions. Recent studies have shown that alkali- and alkaline-earth-metal imides are attractive nitrogen carriers; however, the equilibrium concentration of NH3 in the hydrogenation of imides to ammonia and hydrides is low at atmospheric pressure. Moreover, the reaction rate of nitrogen fixation on the hydrides is slow. Here, we show that an electrodriven CLAS (ECLAS) mediated by a lithium imide is feasible in a LiCl–NaCl–KCl eutectic electrolytic cell with a nickel-foam electrode. We demonstrate that the reactions of lithium imide hydrogenation and lithium hydride nitridation are both promoted by the input of electric energy. The average ammonia production rate over such an electrodriven CLAS is ca. 8 times higher than that of a thermal-driven CLAS.

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Synergistic effect of MgH2 doping with Ni and carbon nanotubes on thermochemical CO2 recycling process for CH4-H2 mixtures production

Amica

Gennari

2022

International Journal of Hydrogen Energy

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Dual application of Ti-catalyzed Li-RHC composite for H2 purification and CO methanation

Abstract: Figure S1 -Evolution of the hydrogen storage capacity with the cycle number for Li-RHC-Ti composite.

Cited by 4 publications

References 66 publications

Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride

Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride

Electrodriven Chemical Looping Ammonia Synthesis Mediated by Lithium Imide

Synergistic effect of MgH2 doping with Ni and carbon nanotubes on thermochemical CO2 recycling process for CH4-H2 mixtures production

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