Effect of the calcination temperature on Ni/MgAl2O4 catalyst structure and catalytic properties for partial oxidation of methane

Özdemi̇r, Hasan; Öksüzömer, M.A. Faruk; Gürkaynak, M. Ali

doi:10.1016/j.fuel.2013.07.095

Cited by 111 publications

(44 citation statements)

References 24 publications

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“…Additionally, the surface atom Mg/Al ratio of Ni/Mg.Al.550 (Table 3) exposes an excess amount of Al species on the surface, also suggesting surface NiAl 2 O 4 formation in Ni/Mg.Al.550 [38]. In contrast, the surface Mg concentration is highest in Ni/Mg.Al.550.CA, revealing the possibility of preferable Ni-Mg interactions on the surface.…”

Section: Coking Resistance and Stability Of Mgal Supported Catalystsmentioning

confidence: 93%

“…Those are slightly higher than the values for free NiO (854.5 eV) [39,40] and close to that observed for Ni2O3 In comparison to Ni/Mg.Al.550, both Ni/Mg.Al.550.CA and Ni/Mg.Al.1000 show a shift in reduction peak maxima in their TPR profiles to higher temperature (900 • C) ( Figure 5). Besides, they consume less hydrogen in the TPR experiment (Table 2), illustrating the formation of poorly reducible Ni 2+ species that have higher interaction with the support frameworks [35,38]. In any case, it could be suggested that the transfer of electrons from nickel to electron-poor magnesium and/or aluminum species in the structure causes the BE to shift to a higher value than that of free NiO [35].…”

Section: Characterization Of the Catalystsmentioning

confidence: 97%

“…In comparison to Ni/Mg.Al.550, both Ni/Mg.Al.550.CA and Ni/Mg.Al.1000 show a shift in reduction peak maxima in their TPR profiles to higher temperature (900 °C) ( Figure 5). Besides, they consume less hydrogen in the TPR experiment (Table 2), illustrating the formation of poorly reducible Ni 2+ species that have higher interaction with the support frameworks [35,38]. XPS measurements were carried out to characterize the surface composition of the materials.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…Such an effect contributes to the higher reducibility of the Mg.Al supported samples compared to Ni/MgO and Ni/Al.550, as shown in the TPR profiles ( Figure 5). Increasing the support calcination temperature from 550 to 1000 • C produces samples with less Ni 2+ domains on the surface available for reduction [38]. As a result, Ni/Mg.Al.1000 provides poorer reducibility compared to Ni/Mg.Al.550 ( Figure 5).…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

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Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5 wt %) supported on Mg-Al mixed oxide. The aim was to minimize carbon deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation. The solids were characterized using N 2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al 2 O 3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550-800 • C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 • C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.

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Section: Coking Resistance and Stability Of Mgal Supported Catalystsmentioning

confidence: 93%

Section: Characterization Of the Catalystsmentioning

confidence: 97%

Section: Characterization Of the Catalystsmentioning

confidence: 99%

Section: Characterization Of the Catalystsmentioning

confidence: 99%

See 2 more Smart Citations

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

View full text Add to dashboard Cite

show abstract

“…Furthermore, the progressive addition of magnesia led to a decrease of the contribution of -type NiO species (from 42% for MgO(0)-NiAl to 26% for MgO(10)-NiAl) ( Table 2). It is also relevant to highlight that, at high temperatures (> 860 ºC), the MgO-rich catalysts exhibited additional reduction peaks which could be related to the reduction of Ni 2+ in (Mg,Ni)Al 2 O 4 mixed spinel [7,32]. This Ni species (-type NiO) represented 4% and 10% of the total Ni reducible species in the MgO(7)-NiAl and MgO(10)-NiAl samples, respectively.…”

Section: Temperature Programmed Reduction (H 2 -Tpr)mentioning

confidence: 94%

MgO/NiAl2O4 as a new formulation of reforming catalysts: Tuning the surface properties for the enhanced partial oxidation of methane

Boukha

Jiménez‐González

Gil-Calvo

et al. 2016

Applied Catalysis B: Environmental

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Syngas production from polyolefins in a semi‐batch reactor system

2021

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We investigate syngas production from polyolefins commonly found in solid waste in a semi‐batch reactor system via gasification and catalytic reforming. We find that the gasification behavior of polymer waste is correlated to the energy of the weakest CH bond in the polymer structure. Furthermore, we show that the syngas yield can be enhanced by the use of adsorbents and reforming catalysts, which promote gasification and reforming over pyrolysis reactions. Adsorbents are required for the achievement of high syngas yields when the polymer feed is comprised of polymers that pyrolyze at lower temperatures, such as PS, PP, and LDPE, resulting in carbon loss as light hydrocarbons. Adsorbents trap these light gases and release them at a higher temperature, where reforming over a Ni/Al2O3 catalyst can take place. This behavior also results in synergistic effects when blends of polymers are gasified. The Ni/Al2O3 catalyst is stable over multiple recycle reactor runs.

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Effect of the calcination temperature on Ni/MgAl2O4 catalyst structure and catalytic properties for partial oxidation of methane

Cited by 111 publications

References 24 publications

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

MgO/NiAl2O4 as a new formulation of reforming catalysts: Tuning the surface properties for the enhanced partial oxidation of methane

Syngas production from polyolefins in a semi‐batch reactor system

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