Effects of temperature and hydrogen pressure on the activation behavior of ZrCo

Kou, Huaqin; Luo, Wenhua; Huang, Zhiyong; Ge, Shenguang; Hu, Changwen; Chen, Changan; Zhang, Guanghui; Luo, Dan; Liu, Meng; Zheng, Sining

doi:10.1016/j.ijhydene.2016.05.011

Cited by 43 publications

(14 citation statements)

References 34 publications

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“…The hydrogen sorption behaviors of the samples were investigated by a Sievert type apparatus. The detailed activation procedures of Zr 0.8 Ti 0.2 Co were performed according to [ 39 ]. The samples were prepared by ball milling of Zr 0.8 Ti 0.2 Co powder using a planetary mill at 400 rpm for different time.…”

Section: Methodsmentioning

confidence: 99%

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Kou

Luo

et al. 2018

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The effects of ball milling on the hydrogen sorption kinetics and microstructure of Zr0.8Ti0.2Co have been systematically studied. Kinetic measurements show that the hydrogenation rate and amount of Zr0.8Ti0.2Co decrease with increasing the ball milling time. However, the dehydrogenation rate accelerates as the ball milling time increases. Meanwhile, the disproportionation of Zr0.8Ti0.2Co speeds up after ball milling and the disproportionation kinetics is clearly inclined to be linear with time at 500°C. It is found from X-ray powder diffraction (XRD) results that the lattice parameter of Zr0.8Ti0.2Co gradually decreases from 3.164 Å to 3.153 Å when the ball milling time extends from 0 h to 8 h, which is mainly responsible for the hydrogen absorption/desorption behaviors. In addition, scanning electron microscope (SEM) images demonstrate that the morphology of Zr0.8Ti0.2Co has obviously changed after ball milling, which is closely related to the hydrogen absorption kinetics. Besides, high-resolution transmission electron microscopy (HRTEM) images show that a large number of disordered microstructures including amorphous regions and defects exist after ball milling, which also play an important role in hydrogen sorption performances. This work will provide some insights into the principles of how to further improve the hydrogen sorption kinetics and disproportionation property of Zr0.8Ti0.2Co.

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Section: Methodsmentioning

confidence: 99%

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Kou

Luo

et al. 2018

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“…Nevertheless, ZrCo exhibits some shortcomings including poor kinetic abilities, inferior hydriding/dehydriding cyclic stability, and hydrogen‐induced disproportionation restricting the development of the ZrCo alloy 7 . The initial activation of a ZrCo granule with a particle size of 2 to 4 mm at 573 K lasts more than 3 hours to reach the saturated hydrogen absorption capacity 14 . The final hydrogenation amount could reach ~1.93 wt% for ZrCo under 4‐bar H 2 at 348 K 15 .…”

Section: Introductionmentioning

confidence: 99%

“…The final hydrogenation amount could reach ~1.93 wt% for ZrCo under 4‐bar H 2 at 348 K 15 . Generally, the disproportionation reaction occurs rapidly under high hydrogen pressure and temperature (>653 K) or repeated hydrogen absorption/desorption cycles, 16 forming the nonhydrogen‐absorbing ZrCo 2 and stable ZrH 2 14 . The hydriding/dehydriding disproportionation reactions are

2 ZrCo + H_{2} \to Zr {Co}_{2} + Zr H_{2}

and

ZrCo H_{3} \to \frac{1}{2} Zr {Co}_{2} + \frac{1}{2} Zr H_{2} + H_{2}

, which are the prime reason deteriorating the hydrogen storage properties of samples.…”

Section: Introductionmentioning

confidence: 99%

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Liang

Wang

et al. 2022

Intl J of Energy Research

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Summary To improve the kinetic properties of the ZrCo alloy, Zr50‐xVxCo50 (x = 0, 2.5, 3.5, and 5.0) samples were fabricated by vacuum arc‐melting. The effects of the V substitution on the microstructure, hydrogen absorption/desorption kinetics, cycling stability, and antidisproportionation properties of ZrCo were systematically investigated. X‐ray diffraction results show that the Zr50‐xVxCo50 (x = 2.5, 3.5, and 5.0) alloys consisted of ZrCo phase and ZrV0.24Co1.76 second phase. The lattice parameter and cell volume gradually decreased with the increase in the V content. The initial activation behavior was improved for the Zr50‐xVxCo50 (x = 2.5, 3.5, and 5.0) samples because of the catalytic effect of the ZrV0.24Co1.76 second phase. Additionally, the equilibrium pressure of hydrogen absorption increased and the plateau width decreased with the increase in the V content. To obtain thermodynamic and kinetic data, ΔH and Ea were calculated using the Van't Hoff equation and Kissinger equation. ΔH of the Zr50‐xVxCo50 (x = 0, 2.5, 3.5, and 5.0)‐H system was reduced from 90.12 to 72.52 kJ·mol−1, while Ea of ZrCoH3 decreased from 113.38 ± 4.2 to 94.13 ± 2.9 kJ·mol−1 for hydrogen desorption, which is beneficial for the hydrogenation/dehydrogenation reaction. Furthermore, the cycling stability and antidisproportionation properties were enhanced after the V addition, particularly for the Zr47.5V2.5Co50 alloy exhibiting an excellent initial activation behavior.

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“…or it can be converted to 2,5bis(hydroxymethyl)furan (BHMF) through another route. (Kou et al, 2016;Priecel et al, 2018;Li and Jiang, 2019). Therefore, the main conversion path of this article is the production of furan compounds such as GVL and BHMF.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Zr/Hf-Containing Acid-Base Bifunctional Catalysts for Hydrogen Transfer Upgrading of Biofuranics: A Review

Liu

et al. 2021

Front. Chem.

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The massive burning of a large amount of fossil energy has caused a lot of serious environmental issues (e.g., air pollution and climate change), urging people to efficiently explore and valorize sustainable alternatives. Biomass is being deemed as the only organic carbon-containing renewable resource for the production of net-zero carbon emission fuels and fine chemicals. Regarding this, the selective transformation of high-oxygen biomass feedstocks by catalytic transfer hydrogenation (CTH) is a very promising strategy to realize the carbon cycle. Among them, the important Meerwein-Ponndorf-Verley (MPV) reaction is believed to be capable of replacing the traditional hydrogenation strategy which generally requires high-pressure H2 and precious metals, aiming to upgrade biomass into downstream biochemical products and fuels. Employing bifunctional heterogeneous catalysts with both acidic and basic sites is needed to catalyze the MPV reaction, which is the key point for domino/cascade reaction in one pot that can eliminate the relevant complicated separation/purification step. Zirconium (Zr) and hafnium (Hf), belonging to transition metals, rich in reserves, can demonstrate similar catalytic efficiency for MPV reaction as that of precious metals. This review introduced the application of recyclable heterogeneous non-noble Zr/Hf-containing catalysts with acid-base bifunctionality for CTH reaction using the safe liquid hydrogen donor. The corresponding catalysts were classified into different types including Zr/Hf-containing metal oxides, supported materials, zeolites, metal-organic frameworks, metal-organic hybrids, and their respective pros and cons were compared and discussed comprehensively. Emphasis was placed on evaluating the bifunctionality of catalytic material and the key role of the active site corresponding to the structure of the catalyst in the MPV reaction. Finally, a concise summary and prospect were also provided centering on the development and suggestion of Zr/Hf-containing acid-base bifunctional catalysts for CTH.

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Effects of temperature and hydrogen pressure on the activation behavior of ZrCo

Cited by 43 publications

References 34 publications

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Recyclable Zr/Hf-Containing Acid-Base Bifunctional Catalysts for Hydrogen Transfer Upgrading of Biofuranics: A Review

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Effects of temperature and hydrogen pressure on the activation behavior of ZrCo

Cited by 43 publications

References 34 publications

Structural and Kinetic Hydrogen Sorption Properties of Zr0.8Ti0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr0.8Ti0.2Co Alloy Prepared by Ball Milling

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr 50‐ x V x Co 50 ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Recyclable Zr/Hf-Containing Acid-Base Bifunctional Catalysts for Hydrogen Transfer Upgrading of Biofuranics: A Review

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Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys