Mesoporous nanostructured Ni/MgAl2O4 catalysts: Highly active and stable catalysts for syngas production in combined dry reforming and partial oxidation

Jalali, Ramin; Nematollahi, Behzad; Rezaei, Mehran; Baghalha, Morteza

doi:10.1016/j.ijhydene.2018.12.186

Cited by 34 publications

(8 citation statements)

References 58 publications

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“…The peaks for support MA were observed at 2θ: 31.34, 36.80, 44.85, 59.40, and 65.34°, corresponding to JCPDS Card no 77−1203 in Figure S2. 24,33,34 The peaks related to Ni/Co species were not so prominent for as-prepared catalysts in Figure 2a S2. 3,33,34 The formation of B−Ni, B−Co, and B−(Ni−Co) was also observed at 2θ = 44.78°(JCPDS no 17−0335), representing the metal-boron interaction, which is in line with the previous studies reported for the catalysts synthesized by the NaBH 4 reduction methods.…”

Section: Characterization Of Spent Catalystmentioning

confidence: 97%

“…24,33,34 The peaks related to Ni/Co species were not so prominent for as-prepared catalysts in Figure 2a S2. 3,33,34 The formation of B−Ni, B−Co, and B−(Ni−Co) was also observed at 2θ = 44.78°(JCPDS no 17−0335), representing the metal-boron interaction, which is in line with the previous studies reported for the catalysts synthesized by the NaBH 4 reduction methods. 35−37 A weak peak at 2θ = 62.21°(JCPDS Card no 47−1049) was indicated for the presence of NiO− CoO due to the partial reduction of the catalysts during the synthesis by the NaBH 4 reduction method.…”

Section: Characterization Of Spent Catalystmentioning

confidence: 97%

“…35−37 A weak peak at 2θ = 62.21°(JCPDS Card no 47−1049) was indicated for the presence of NiO− CoO due to the partial reduction of the catalysts during the synthesis by the NaBH 4 reduction method. 3,14,34 However, no separate peak of Co was appeared for bimetallic catalysts due to the multi-peaks overlapping or alloy formation. 3,7,30 No peak was also observed, corresponding to other B compounds such as boron oxide.…”

Section: Characterization Of Spent Catalystmentioning

confidence: 99%

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NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Shakir

Prasad

Ray

et al. 2022

ACS Appl. Nano Mater.

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Carbon deposition on a catalyst surface is detrimental to the dry reforming of methane (DRM) reaction. The addition of boron (B) is found to be effective in lowering carbon deposition. In this study, bimetallic Ni, Co catalysts over MgAl 2 O 4 (MA) [B−(Ni−Co)/ MA] with different Ni/Co ratios are synthesized by the NaBH 4 reduction method and examined for DRM at 600 °C and atmospheric pressure. The NaBH 4 plays crucial roles in reducing metal salt to metal, incorporating B, and enhancing the dispersion of active metallic species in a one-step catalyst preparation method. Rod-like Ni−Co alloy and B−(Ni−Co) nanostructures on the two-dimensional flakes of MA are observed. The Ni-rich B-containing bimetallic [B−(75Ni−25Co)] catalyst exhibits better methane and carbon dioxide conversions compared to other prepared catalysts. The turnover frequency (CH 4 ) and produced syngas ratio of the B-catalyst are 1.5 and 1.04 times, respectively, higher than the non-B catalyst prepared by the traditional impregnation method with the same Ni/Co ratio. The catalyst [B− (75Ni−25Co)] exhibits higher activity and almost a steady conversion rate, while continuous decrement is observed for the non-B catalyst. Exceptionally low carbon deposition (∼3.6 times) was observed for B−(75Ni−25Co)/ MA than the non-B catalyst. Furthermore, the density functional theory investigation also revealed that the adsorption energy (E ads ) of carbon at various sites of 75Ni25Co significantly reduces by ∼0.5 eV in the presence of B, causing hindrance to the formation of carbon over the surface.

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Section: Characterization Of Spent Catalystmentioning

confidence: 97%

Section: Characterization Of Spent Catalystmentioning

confidence: 97%

Section: Characterization Of Spent Catalystmentioning

confidence: 99%

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NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Shakir

Prasad

Ray

et al. 2022

ACS Appl. Nano Mater.

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“…The coke which formed in the reforming condition is obtained from polymerization of carbon atoms acquired from the dehydrogenation of methane (CH 4 ↔ C + 2H 2 ) and scientists called this type of coke as whisker carbon. Usually, whisker carbon left a vertical line in the TPO analysis that shows the burning of this type of coke . In contrast, no vertical line was observed in the TPO profiles of the spent CO methanation catalysts.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fe‐Containing Supports Prepared by a Novel Sol–Gel Method in the CO Methanation Reaction: CO Elimination and Synthetic Natural Gas Production

et al. 2019

Self Cite

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Herein, the CO methanation reaction is studied over Ni/Fe–Al mixed oxides with various Fe and Al contents. The mesoporous nanocrystalline supports are prepared by a novel sol–gel process using propylene oxide as a gelation agent. The deposition–precipitation method is used for the deposition of nickel on the catalyst support. The samples are characterized by Brunauer–Emmett–Teller (BET), X‐ray diffractometry (XRD), temperature programmed reduction (TPR), temperature programmed oxidation (TPO), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that increasing the iron content and reducing the Al percentage in the catalyst support reduces the specific surface area of the supports from 340 to 8 m2 g−1 and improves the reducibility of nickel in the prepared catalysts. The catalytic results of pre‐reduced catalysts show superior activity for CO elimination even at temperatures below 260 °C. The nonreduced catalysts reveal that the catalysts with a higher content of iron in the catalyst support show higher activity at lower temperatures. However, due to the lower thermal stability of iron oxide compared with that of aluminum oxide and exothermic nature of the CO methanation reaction, the catalysts with a higher content of iron exhibit lower stability during the reaction.

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“…In addition, it facilitates the dispersion and diffusivity of the active species that help to increase the hydrogenation activity. Magnesium aluminum spinel (MgAl 2 O 4 ) is widely utilized in the catalyst support − due to its high hydrothermal stability, hydrophobicity, outstanding mechanical robustness, low surface acidity, and large number of empty oxygen sites. These empty oxygen sites lead to higher adsorption of oxygen-containing compounds, such as glucose, the intermediate compound in the transformation of cellulose to EG.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Ni/W/Cu on MgAl₂O₄ for One-Pot Hydrogenolysis of Cellulose to Ethylene Glycol at a Low H₂ Pressure

Liang

Chen

et al. 2021

ACS Omega

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Nickel and tungsten, combined with copper, were incorporated into a magnesium aluminum spinel to form a multifunctional catalyst (Ni–W–Cu/MgAl 2 O 4 ). Characterization results suggested that the adjacent Cu not only facilitated the reduction of W 6+ to W 5+ with substantial oxygen vacancies but also promoted the reducibility of the Ni species. Besides, the incorporation of Ni, W, and Cu into the support enhanced the catalytic acidity, as well as the L acid sites. The catalyst exhibited a strong synergistic effect between the three metals and the support, resulting in higher catalytic activity for the one-pot hydrogenolysis of cellulose to ethylene glycol. High cellulose conversion (100%) and ethylene glycol yield (52.8%) were obtained, even under a low H 2 pressure of 3 MPa.

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Mesoporous nanostructured Ni/MgAl2O4 catalysts: Highly active and stable catalysts for syngas production in combined dry reforming and partial oxidation

Cited by 34 publications

References 58 publications

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Effect of Fe‐Containing Supports Prepared by a Novel Sol–Gel Method in the CO Methanation Reaction: CO Elimination and Synthetic Natural Gas Production

Synergistic Effect of Ni/W/Cu on MgAl₂O₄ for One-Pot Hydrogenolysis of Cellulose to Ethylene Glycol at a Low H₂ Pressure

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Mesoporous nanostructured Ni/MgAl2O4 catalysts: Highly active and stable catalysts for syngas production in combined dry reforming and partial oxidation

Cited by 34 publications

References 58 publications

NaBH4-Assisted Synthesis of B–(Ni–Co)/MgAl2O4 Nanostructures for the Catalytic Dry Reforming of Methane

NaBH4-Assisted Synthesis of B–(Ni–Co)/MgAl2O4 Nanostructures for the Catalytic Dry Reforming of Methane

Effect of Fe‐Containing Supports Prepared by a Novel Sol–Gel Method in the CO Methanation Reaction: CO Elimination and Synthetic Natural Gas Production

Synergistic Effect of Ni/W/Cu on MgAl2O4 for One-Pot Hydrogenolysis of Cellulose to Ethylene Glycol at a Low H2 Pressure

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NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Synergistic Effect of Ni/W/Cu on MgAl₂O₄ for One-Pot Hydrogenolysis of Cellulose to Ethylene Glycol at a Low H₂ Pressure