Hydrogen production by steam reforming of liquefied natural gas (LNG) over mesoporous Ni/Al2O3 catalyst prepared by an EDTA-assisted impregnation method

Bang, Yongju; Park, Seungwon; Han, Seung Ju; Yoo, Juhyun; Song, Ji Hwan; Choi, Jung Ho; Kang, Ki Hyuk; Song, In Kyu

doi:10.1016/j.apcatb.2015.06.023

Cited by 77 publications

(32 citation statements)

References 55 publications

(60 reference statements)

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“…Over the monometallic Fe-free sample (curve e, Fig. 3A'), hydrogen atoms are being desorbed from (i) the exposed surfaces of highly dispersed Ni 0 nanoparticles with high capacity of hydrogen dissociation at temperatures below 450 o C [54] and from (ii) the surfaces of Ni 0 particles immersed in an alumina layer (subsurface species) at temperatures above 600 o C [66,67]. The relative surface area of the high temperature desorption peaks (maxima at 880e890 o C) is much larger than that at low temperatures (maxima around 200 o C) indicative of a population of metallic Ni species that is occluded within the alumina matrix (in the porous arrangement of the support), as will be verified on TEM images.…”

Section: H 2 -Tpd and Dispersion Analysis In Reduced Al 2 O 3 -Based Materialsmentioning

confidence: 99%

Ordered mesoporous Fe-Al2O3 based-catalysts synthesized via a direct "one-pot" method for the dry reforming of a model biogas mixture

Jabbour

Inaty

Davidson

et al. 2019

International Journal of Hydrogen Energy

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Biogas plays a vital role in the emerging renewable energy sector and its efficient utilization is attracting significant attention as an alternative energy carrier to non-renewable fossil fuel resources. Since biogas consists mainly of CH 4 and CO 2 , dry reforming of methane arises as an appropriate process enabling its chemical conversion to high-quality synthesis gas (syngas: H 2 and CO mixtures). In this study, we synthesized via a direct "one-pot" method following an evaporation-induced self-assembly approach, ordered mesoporous Fe 10% , Ni 5% and Fe x% Ni (1-x) (x: 2.5, 5 or 7.5%) in Al 2 O 3 as catalysts for syngas production via dry reforming of a model biogas mixture (CH 4 /CO 2 ¼ 1.8, at a temperature of 700 o C). Monometallic Fe 10% Al 2 O 3 catalyst presented lower reactivity levels and slightly deactivated during catalysis compared to stable Ni 5% Al 2 O 3 . According to physico-chemical characterization techniques, the incomplete reduction of Fe 2 O 3 into Fe 3 O 4 rather than Fe 0 nanoparticles (catalytically active) coupled with the segregation of Fe 3 O 4 oxides were the main factors leading to the low performance of mesoporous Fe 10% Al 2 O 3 . These drawbacks were overcome upon the partial substitution of Fe by Ni (another transition metal) forming specifically bimetallic Fe 5% Ni 5% Al 2 O 3 displaying reactivity levels close to thermodynamic expected ones. The formation of Fe-Ni alloys stabilized iron inside alumina matrix and protected it from segregation. Along with the confinement effect, spent catalyst characterizations showed high resistance towards coke deposition.

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Section: H 2 -Tpd and Dispersion Analysis In Reduced Al 2 O 3 -Based Materialsmentioning

confidence: 99%

Ordered mesoporous Fe-Al2O3 based-catalysts synthesized via a direct "one-pot" method for the dry reforming of a model biogas mixture

Jabbour

Inaty

Davidson

et al. 2019

International Journal of Hydrogen Energy

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“…Table 5-3). The low uptake is in agreement with the literature [145,146], as supported Ni catalysts generally show low uptake and dispersion (1-5% dispersion depending on the support used) during H2 pulse chemisorption experiments due to sintering of the metal. For the substituted material, no H2 chemisorption was detected.…”

Section: Tpr and H 2 Pulse Chemisorptionsupporting

confidence: 91%

Steam Reforming of CH4 Using Ni- Substituted Pyrochlore Catalysts

Haynes¹

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The steam reforming of methane (SMR) continues to remain an important industrial reaction for large-scale production of H2 as well as synthesis gas mixtures which can be used for the production of useful chemicals (e.g. methanol). Although SMR is a rather mature technology, traditional nickel based catalysts used industrially are subjected to severe temperatures and reaction conditions, which lead to irreversible activity loss through sintering, support collapse, and carbon formation. Pyrochlore-based mixed oxide have been identified as refractory materials that can be modified through the substitution of catalytic metals and other promoting species into the structure to mitigate these issues causing deactivation. For this study, a lanthanum zirconate pyrochlore catalyst was substituted with Ni to determine whether the oxide structure could effectively stabilize the activity of the catalytic metal during the SMR. The effect of different variables including calcination temperature, a comparison of a substituted versus supported Ni pyrochlore catalyst, Ni weight loading, and Sr promotion have been evaluated to determine the location of the Ni in the structure, and their effect on catalytic behavior.

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“…The high-resolution scan of Ni 2p (Figure 4b) exhibited binding energies of approximately 853.1 (Ni p 3/2 ) and 872.7 eV (Ni p 1/2 ), which can be attributed to Ni 2 + of NiO [26,28,29] while the binding energy of approximately 855.1 was caused by Nickel aluminate. [30][31][32] The presence of two satellite peaks at 860.0 and 878.6 eV are due to the strong shake-up process of Ni p 3/2 and Ni p 1/2, respectively in NiO. [29,32,33] In the O 1s (figure 4c) spectra, the bonding energies at 535.8, 531.5, and 529.1 eV corresponded to O on SiO 2 , [34] Al 2 O 3 , [35] and NiO [36] respectively.…”

Section: Catalyst Characterizationmentioning

confidence: 98%

Hydrogenation of Furfural to Furfuryl Alcohol over Nickel Supported Bentonite Catalyst

2021

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In this work, nickel-supported bentonite catalyst was prepared by wet impregnation method followed by activation and reduction. The nickel catalyst showed excellent catalytic activity for hydrogenation of furfural with 98 % selectivity towards furfuryl alcohol. In addition, various reaction parameters such as temperature, time, catalyst loading, solvents, and catalyst recycling, were optimized to enhance furfural conversion and furfuryl alcohol selectivity.

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Hydrogen production by steam reforming of liquefied natural gas (LNG) over mesoporous Ni/Al2O3 catalyst prepared by an EDTA-assisted impregnation method

Cited by 77 publications

References 55 publications

Ordered mesoporous Fe-Al2O3 based-catalysts synthesized via a direct "one-pot" method for the dry reforming of a model biogas mixture

Ordered mesoporous Fe-Al2O3 based-catalysts synthesized via a direct "one-pot" method for the dry reforming of a model biogas mixture

Steam Reforming of CH4 Using Ni- Substituted Pyrochlore Catalysts

Hydrogenation of Furfural to Furfuryl Alcohol over Nickel Supported Bentonite Catalyst

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