Influence of La2O3composition in MgO–La2O3mixed oxide-supported Co catalysts on the hydrogen yield in glycerol steam reforming

Surendar, M.; Padmakar, D.; Lingaiah, N.; Rao, K. Seshagiri; Prasad, P. S. Sai

doi:10.1039/c6se00023a

Cited by 19 publications

(4 citation statements)

References 31 publications

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“…Figure S2). Similar behavior was reported by Surendar and colleagues 44 when Mg 2+ was partially inserted into La 3+ , which resulted in a shift of La 2 O 3 XRD peaks. They also reported the enhancement of metal dispersion and the high reducibility as a result of the interaction between La and MgO.…”

Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 86%

Syngas Production via Methane Dry Reforming over Ceria–Magnesia Mixed Oxide-Supported Nickel Catalysts

Al–Swai

Osman

Alnarabiji

et al. 2018

Ind. Eng. Chem. Res.

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Dry reforming of methane (DRM) is becoming an appealing research topic because of the urgent need to minimize global warming and the demand for alternative energy resources. However, DRM commercialization and industrial scale application are limited by the deactivation of the applied catalysts. In this work, Ni-based catalysts supported on CeO 2 −MgO mixed oxides (0−20% CeO 2 molar content) were prepared and employed in DRM. The support was synthesized via a coprecipitation method followed by impregnation of Ni metal. The catalysts prepared were characterized by X-ray diffraction, Brunauer−Emmett−Teller (BET) analysis, temperature-programmed reduction, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy (FESEM) techniques. The catalytic performance of the catalysts was evaluated in a fixed-bed continuous reactor with an equimolar (CH 4 /CO 2 ) ratio at 1073 K. The addition of CeO 2 , as a promoter to the support, altered the interaction between Ni and MgO and modulated the properties of the catalysts toward an excellent activity performance and multiwalled carbon nanotubes (MWCNTs) production. CeO 2 significantly enhanced the BET surface area, promoted Ni dispersion, and improved the reducibility of the catalyst. Among the obtained catalysts, Ni/15%CeO 2 −MgO achieved the maximum conversion of both CO 2 (95.2%) and CH 4 (93.7%) without significant deactivation during the reaction. The superior catalytic performance of the aforementioned catalyst is due to the presence of a high quantity of active Ni sites and the high Ce 3+ /Ce 4+ ratio that promoted the formation of oxygen vacancies. With the aid of temperature-programmed oxidation, FESEM, transmission electron microscopy, and Raman spectroscopy analysis, it was found that the amorphous carbon encapsulated the active sites of the catalysts, in the absence of Ce, which suppressed the syngas production significantly. The introduction of Ce not only decreased the deposited carbon but also changed the type of the later to MWCNTs, which had positive effects on the activity of the catalyst.

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Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 86%

Syngas Production via Methane Dry Reforming over Ceria–Magnesia Mixed Oxide-Supported Nickel Catalysts

Al–Swai

Osman

Alnarabiji

et al. 2018

Ind. Eng. Chem. Res.

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“…Subsequently, reaction of R5 occurred due to the presence of char in the support, and CO was produced that could reduce compound Ni to elemental Ni. Meanwhile, the higher the La content, the broader and weaker were the characteristic peaks of NiAl2O4 that appeared, demonstrating that the crystal particles became smaller (Surendar et al 2017). This result revealed that La could effectively decrease the particle size of NiAl2O4.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 89%

Syngas production by catalytic pyrolysis of rice straw over modified Ni-based catalyst

Lan

Qin

et al. 2020

BioRes

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Ni-xLa/Al2O3-MgO-sawdust char catalysts were prepared by modifying the Ni/Al2O3 catalyst from two aspects of support and active components. The effect of Al2O3, MgO, sawdust char molar ratio, and La content of catalysts on syngas (H2 + CO) production in the catalytic pyrolysis of rice straw was investigated in a horizontal ﬁxed-bed quartz tube reactor. Furthermore, the stability of catalysts with the optimum catalytic performance was tested and compared with that of the Ni/Al2O3 catalysts. X-ray diffraction, X-ray ﬂuorescence, ﬁeld emission scanning electron microscopy, energy disperse X-ray, and Brunauer-Emmett-Teller analyses were applied to understand the physiochemical properties of the supports and catalysts. The study revealed that the supports were composed of many irregular flaky particles and thus formed many pores. Moreover, the addition of La decreased the particle size of NiAl2O4 and increased the active metal surface of the Ni/Al2O3-MgO-sawdust catalysts. When the molar ratio of Al2O3, MgO, and sawdust char was 1:1:1 and the La content was 10 wt% (dry weight basis), the catalysts presented the highest syngas concentration of 78.9 vol% and the most stable performance during the catalytic pyrolysis process.

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“…[45] Prasad et al utilized MgO-La 2 O 3 supported Co catalyst for complete conversion of glycerol at 700 °C. [46] Although, the glycerol reforming process led to the production of H 2 gas, but it suffers from the cumbersome postproduction purification of H 2 gas, due to the contamination of CO, CO 2 , CH 4 . Alternatively, H 2 gas can be produced from oxidant-free [47,48] or O 2 free [49] dehydrogenation of glycerol to lactic acid.…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogen Production from Glycerol over Ruthenium Catalyst

et al. 2022

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Glycerol – one of the prominent by‐products of biodiesel is also an important source of hydrogen gas. Herein, the efficient and selective production of hydrogen gas from glycerol in water at 90–120 °C over a ruthenium nanoparticle (∼2.7 nm) catalyst is demonstrated. Notably, high yield of hydrogen gas (n(H2)/n(glycerol); 0.96–1.61) was achieved from the glycerol‐water solution, where the reaction temperature and base concentration played crucial role in achieving high yield of H2. Advantageously, under the studied reaction conditions, the ruthenium catalyst also exhibited appreciably high long‐term stability for over 36 h while generating ca. 70 L H2 per gram of Ru with H2 yield of 350 L per L of glycerol. Moreover, high yield for lactic acid is also achieved during the production of hydrogen gas from glycerol.

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Influence of La₂O₃composition in MgO–La₂O₃mixed oxide-supported Co catalysts on the hydrogen yield in glycerol steam reforming

Abstract: Partially Mg-substituted LaCoO3perovskite is a good precursor, for the generation of cobalt nanoparticle derived under the reduction atmosphere. The La2O2CO3phase formed is more efficient in removing the carbon from the cobalt active site.

Cited by 19 publications

References 31 publications

Syngas Production via Methane Dry Reforming over Ceria–Magnesia Mixed Oxide-Supported Nickel Catalysts

Syngas Production via Methane Dry Reforming over Ceria–Magnesia Mixed Oxide-Supported Nickel Catalysts

Syngas production by catalytic pyrolysis of rice straw over modified Ni-based catalyst

Selective Hydrogen Production from Glycerol over Ruthenium Catalyst

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