Synthesis and characterization of Ni/Ce–SiO2 and Co/Ce–TiO2 catalysts for methane decomposition

Tapia-Parada, Karina; Valverde-Aguilar, Guadalupe; Mantilla, A.; Valenzuela, Miguel A.; Hernández, Esteban

doi:10.1016/j.fuel.2012.11.022

Cited by 55 publications

(18 citation statements)

References 27 publications

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“…It can be concluded that, support type used play a significant role in both catalytic activity and stability as reported by other investigators. 21 Fig. 8 (a-d).…”

Section: Time On Stream (Tos)mentioning

confidence: 99%

“…[18][19][20][21] These catalysts contribute to the growth of carbon nanofibers or carbon nanotubes with textural and structural properties that differ as a function of the catalyst composition and the operational conditions. [22][23][24][25] Both active metal and support are responsible for hydrogen production and the quantity and quality of carbon material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Ibrahim

Al‐Fatesh

Khan

et al. 2015

J Chinese Chemical Soc

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Natural gas resources, stimulate the method of catalytic methane decomposition. Hydrogen is a superb energy carrier and integral component of the present energy systems, while carbon nanotubes exhibit remarkable chemical and physical properties. The reaction was run at 700°C in a fixed bed reactor. Catalyst calcination and reduction were done at 500°C. MgO, TiO 2 and Al 2 O 3 supported catalysts were prepared using a co-precipitation method. Catalysts of different iron loadings were characterized with BET, TGA, XRD, H 2 -TPR and TEM. The catalyst characterization revealed the formation of multi-walled nanotubes. Alternatively, time on stream tests of supported catalyst at 700°C revealed the relative profiles of methane conversions increased as the %Fe loading was increased. Higher %Fe loadings decreased surface area of the catalyst. Iron catalyst supported with Al 2 O 3 exhibited somewhat higher catalytic activity compared with MgO and TiO 2 supported catalysts when above 35% Fe loading was used. CH 4 conversion of 69% was obtained utilizing 60% Fe/Al 2 O 3 catalyst. Alternatively, Fe/MgO catalysts gave the highest initial conversions when iron loading below 30% was employed. Indeed, catalysts with 15% Fe/MgO gave 63% conversion and good stability for 1 h time on stream. Inappropriateness of Fe/TiO 2 catalysts in the catalytic methane decomposition was observed.

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“…It can be concluded that, support type used play a significant role in both catalytic activity and stability as reported by other investigators. 21 Fig. 8 (a-d).…”

Section: Time On Stream (Tos)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Ibrahim

Al‐Fatesh

Khan

et al. 2015

J Chinese Chemical Soc

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“…However, nickel, cobalt and iron were found to be the most cost effective active metals for this process and generally, these were supported over various mono and mixed metal oxides carriers such as MgO, TiO 2 , Al 2 O 3 , ZrO 2 , CeO 2 , SiO 2 , CeO 2 -TiO 2 and Al 2 O 3 -MgO [20][21][22]. Moreover, it has been reported that, in comparison to Ni based catalysts, Fe containing catalysts showed relatively better stability with acceptable high activity during CDM at moderate as well as at high reaction temperatures [23].…”

mentioning

confidence: 91%

Methane decomposition over Fe supported catalysts for hydrogen and nano carbon yield

Fakeeha

Ibrahim

Naeem

et al. 2015

Catalysis for Sustainable Energy

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Production of hydrogen, being an environmentally friendly energy source, has gained a lot of attention in the recent years. In this article, iron-based catalysts, with different active metal loadings, supported over magnesia and titania are investigated for hydrogen production via catalytic decomposition of methane. The catalytic activity and stability results revealed that magnesia supported catalysts performed better than titania supported catalysts. Hydrogen reduction temperature of 500°C was obtained suitable for catalyst activation. For magnesia supported catalysts, only higher loadings i.e., 30% and 40% Fe-Mg catalysts showed reasonable activity, while all titania supported catalysts presented less activity as well as deactivation. Among all the catalysts, 30% Fe/MgO catalyst displayed better activity. The formation of carbon nanofibers was evidenced from morphological analysis. FESEM and TEM images showed the generation of nonuniform carbon nanofibers with broader diameter. The catalysts were characterized using different techniques such as BET, H2-TPR, O2-TPO, XRD, TGA, FESEM and TEM.

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“…Therefore, effective consumption of the electrons in conduction band is the key for the improvement of photocatalytic performance. It has reported that rare‐earth ions with f ‐orbitals act as efficient surface traps and absorb the electrons, which effectively alter the recombination rate of photogenerated carriers, then improve the photocatalytic performance. Among the lanthanide ions, the catalytic properties of cerium have received much attention due to the alteration of Ce oxidation state between Ce 3+ with 4 f 1 5 d 0 and Ce 4+ with 4 f 0 5 d 0 , which brings about excellent oxygen mobility .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

Quan

Shi

et al. 2020

ChemistrySelect

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The photocatalysts Bi 2 O 3 :Ce 3 + /Ce 4 + (cerium content 0.2, 0.5, 0.8, and 1.1 wt. %) were prepared via one-pot ethylene glycolassisted solvothermal method. The prepared x Ce-Bi 2 O 3 (x = 0.5, 0.8, 1.1) samples present δ-Bi 2 O 3 phase with space group of Fm-3 m at room temperature, which indicates that the hightemperature cubic phase could be stabilized via Ce doping in Bi 2 O 3 lattices. Moreover, the addition of Ce 3 + /Ce 4 + could change the amount of oxygen vacancies (OVs) and adsorbed oxygen on the surface of photocatalysts. The existence of oxygen vacancies and adsorbed oxygen facilitated the generation of superoxide radicals () and hydroxide radicals (), which were the dominant reactive oxygen species for phenol degradation. The photocatalyst containing 0.8 wt. % cerium presented the highest photoactivity than the other synthesized samples. A photodegradation mechanism is proposed based on scavenger and electron spin resonance studies.[a] T.

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Synthesis and characterization of Ni/Ce–SiO2 and Co/Ce–TiO2 catalysts for methane decomposition

Cited by 55 publications

References 27 publications

Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Methane decomposition over Fe supported catalysts for hydrogen and nano carbon yield

Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

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Synthesis and characterization of Ni/Ce–SiO2 and Co/Ce–TiO2 catalysts for methane decomposition

Cited by 55 publications

References 27 publications

Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Influence of Support Type and Metal Loading in Methane Decomposition over Iron Catalyst for Hydrogen Production

Methane decomposition over Fe supported catalysts for hydrogen and nano carbon yield

Photocatalytic Activity of Bi2O3 Enhanced by the Addition of Ce3+/Ce4+ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

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Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method