Evaluation of the reactivity, selectivity and lifetime of hydrotalcite-based catalysts using isopropanol as probe molecule

Abdelsadek, Zoulikha; González-Cortés, Sergio; Bali, Feroudja; OuizaCherifi,; Halliche, D.; Masset, Patrick J.

doi:10.1007/s11164-021-04640-2

Cited by 9 publications

(7 citation statements)

References 40 publications

(67 reference statements)

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“…Indeed, the presence of Mg has many positive effects such as dispersive effect of Ni particles, acid-base properties and resistance to coke deposition as reported in the literature. 6,7,13,24 These results show that the combination of La with Mg can significantly improve the characteristics of the catalyst precursor for the DRM reaction. The crystal structure and microstructural defects at high temperatures and low oxygen partial pressure seem to actively participate to the DRM reaction without poisoning the Ni particles.…”

Section: Catalytic Activity: Drm Catalytic Testingmentioning

confidence: 86%

“…According to the literature, 6,7,[24][25][26][27] the incorporation of Mg into the hydrotalcite matrix positively influences the catalytic performances and reactivity of the dry methane reforming. Indeed, the presence of Mg has many positive effects such as dispersive effect of Ni particles, acid-base properties and resistance to coke deposition as reported in the literature.…”

Section: Catalytic Activity: Drm Catalytic Testingmentioning

confidence: 99%

“…Hydrotalcites retain their layered structure up to 400°C and even at higher temperatures for large-area mixed metal oxides. Calcination of hydrotalcite leads to the formation of mixed-oxide phases that are potentially useful as catalysts or catalyst precursors owing to their following properties [4][5][6][7] : (1) simple preparation method that is easy to perform in the laboratory and for industrial upscaling; (2) thermostable phases with a specific surface which varies between 100 and 300 m 2 /g; (3) adjustable Bro ¨nsted acid/base properties; (4) good dispersion of the active phase. Hydrotalcite (HT) as catalyst is also widely investigated in CO 2 methane reforming 8 (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Abdelsadek

Köten

González-Cortés

et al. 2022

JOM

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In recent decades, considerable attention has been paid to the catalytic dry reforming of methane to obtain syngas. This reaction has very important environmental implications due to the utilization of CH4 and CO2, gases that contribute to the greenhouse effect. The dry reforming of methane is normally carried out over strong basic catalysts with noble metals. Nickel has emerged as an interesting alternative, although it tends to deactivate and form carbon whiskers, which could block the reactor. It is therefore necessary to improve their catalytic performance (conversion, selectivity and stability). In this work, Ni0.69La0.31 and Ni0.14Mg0.55La0.31 were studied in the dry methane reforming reaction. The precursors were prepared by co-precipitation and the oxide phases were obtained by calcining these precursors at 450°C/6 h. The XRD diagrams of the calcined samples show the formation of mixed oxide phases with a periclase-like structure. Analysis of the temperature-programmed reduction shows that the presence of Mg shifts the reduction to higher temperatures. The catalysts, reduced at 650°C, were tested in this reaction as a function of operating time at 650°C. No deactivation occurred after 20 h of operation. Furthermore, the combination of Mg and La drastically improves the conversion and selectivity of the catalyst (> 95%).

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Section: Catalytic Activity: Drm Catalytic Testingmentioning

confidence: 86%

Section: Catalytic Activity: Drm Catalytic Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Abdelsadek

Köten

González-Cortés

et al. 2022

JOM

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“…Abdelsadek et al 64 and Abdelhamid et al 65 have ascribed the production of acetone by dehydrogenation of IPA to the presence of basic sites. Their hypotheses 64,65 strongly supported our findings herein. Others linked nonoxidative dehydrogenation of IPA to the exposed (111) facets of Cu catalyst 66 based on the calculated values of the energy barrier for the dehydrogenation process, or in the case of the photocatalytic dehydrogenation of IPA, due to the formation of highly defect (001) faceted–ZnO 67 that facilitate the adsorption of IPA during its dehydrogenation to acetone.…”

Section: Resultsmentioning

confidence: 99%

Section: Stability and Reusability Of Znomentioning

confidence: 99%

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Halawy

Osman

Rooney

2022

Energy Science & Engineering

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Herein we demonstrate the preparation and characterization of nanocrystalline ZnO, either pure or promoted with 1–10 wt.% K2O. All catalysts calcined at 400°C were in the nano‐crystallite scale as confirmed by X‐ray powder diffraction analysis in the 22.9–28.0 nm range. According to the CO2‐temperature‐programmed desorption study using thermogravimetric analysis and differential scanning calorimetry techniques, they have a broad spectrum of surface basic sites. Because of the significance of methyl ethyl ketone (MEK) as a next‐generation biofuel candidate with high‐octane, low boiling point, and relatively high vapor pressure. The prepared catalysts were examined during the direct production of MEK via 2‐butanol (2B) dehydrogenation. Among catalysts tested, ZnO promoted with 1% K2O showed a superior catalytic activity towards the conversion of 2B to MEK, that is, 71.7% at a reaction temperature of 275°C. The selectivity for the production of MEK over all catalysts was ≥95% across all catalysts when using N2‐gas as a carrier. The use of airflow in this reaction resulted in a clear loss of selectivity toward MEK production as well as the appearance of undesirable products such as acetone and methanol. All catalytic properties of catalysts, particularly those of moderate strength, were highly correlated with the distribution of surface basic sites. Finally, a reaction mechanism was proposed for the dehydrogenation of 2B, followed by the partial oxidation of MEK.

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Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S‐Defection in a Self‐Assembled Microscale CuS/rGO/CP Photoanode

Kim

Seo

Park

et al. 2023

Energy & Environ Materials

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CuS is an encouraging photoelectrode candidate that meets the essential requirements for efficient solar‐to‐hydrogen production, but it has not been thoroughly studied. A CuS light absorber layer is grown by the self‐assembly of copper and sulfur precursors on a carbon paper (CP) electrode. Simultaneously, rGO is introduced as a buffer layer to control the optical and electrical properties of the absorber. The well‐ordered microstructural arrangement suppresses the recombination loss of electrons and holes owing to enhanced charge‐carrier generation, separation, and transport. The potential reaching 10 mA cm−2 in 1.0 m KOH solution is significantly lowered to 0.87 V, and the photocurrent density at 1.23 V is 94.7 mA cm−2. The computational result reveals that the potential‐determining step is sensitive to O* stability; the lower stability of O* in the thin layer of CuS/rGO decreases the free‐energy gap between the initial and final states of the potential‐determining step, resulting in a lowering of the onset potential. The faradaic efficiency for the photoelectrochemical oxygen evolution reaction in the optimized 2CuS/1rGO/CP photoanode is 98.60%, and the applied bias photon‐to‐current and the solar‐to‐hydrogen efficiencies are 11.2% and 15.7%, respectively, and its ultra‐high performance is maintained for 250 h. These record‐breaking achievement indices may be a trigger for establishing a green hydrogen economy.

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Evaluation of the reactivity, selectivity and lifetime of hydrotalcite-based catalysts using isopropanol as probe molecule

Cited by 9 publications

References 40 publications

Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S‐Defection in a Self‐Assembled Microscale CuS/rGO/CP Photoanode

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Evaluation of the reactivity, selectivity and lifetime of hydrotalcite-based catalysts using isopropanol as probe molecule

Cited by 9 publications

References 40 publications

Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Lanthanum-Promoted Nickel-Based Catalysts for the Dry Reforming of Methane at Low Temperatures

Highly basic and active ZnO–x% K2O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S‐Defection in a Self‐Assembled Microscale CuS/rGO/CP Photoanode

Contact Info

Product

Resources

About

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel