Effect of heat treatment conditions on the growth of MgAl2O4 nanoparticles obtained by sol-gel method

Wen, Yubin; Liu, Xinhong; Chen, Xiaoyu; Jia, Quanli; Yu, Renhong; Ma, Teng

doi:10.1016/j.ceramint.2017.08.061

Cited by 31 publications

(8 citation statements)

References 33 publications

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“…It has been reported that the nano-rods offer a higher number of surface-active metal sites for the catalytic reaction. , Furthermore, the lattice fringes of the metal and support were clearly observed in Figure b. The lattice d-spacing of 0.46 nm was observed for MA (311) . The d-spacing of 0.21 and 0.30 nm is attributed to the Ni–CO alloy (111) and B–Ni–Co (111) species (Figure c,d). − Figure S3b represents the EDS analysis of the catalyst that also confirmed the presence of Ni, Co, Mg, Al, O, and B.…”

Section: Resultsmentioning

confidence: 91%

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: Resultsmentioning

confidence: 91%

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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“…[26][27][28][29] Several preparation strategies for the fabrication of Mg-Al spinel ceramics have been presented by various researchers. [30][31][32][33][34][35][36][37] However, these approaches are linked with high cost and complex processes; therefore, they are confined to the laboratory scale. Multiple reports [38][39][40][41] have detailed the use of solid-state reaction method for the synthesis of MgAl 2 O 4 spinel due to its low production costs and commercial feasibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnesium aluminate spinel—An overview

Baruah

Bhattacharyya

Sarkar

2023

Int J Applied Ceramic Tech

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Magnesium aluminate spinel (MAS) is a remarkable ceramic material known for its unique combination of beneficial properties. But due to volume expansion associated with spinel formation, and the high cost of production, MAS was not commercially successful till last century. However, environmental friendliness and superior properties have helped MAS to substitute magnesia-chrome refractories and are commercially acceptable with time. From an industrial perspective, solid-oxide reaction route or conventional oxide mixing route is the most popular method used for the synthesis of MAS. Although there have been myriad other common routes-coprecipitation, sol-gel, auto-ignition, molten technique, and so forth to produce spinel, solid-oxide reaction route is still the principal route from the industrial point of view owing to its ease of bulk production and low cost of production for refractory applications. This report attempts to accumulate the information on different synthesis techniques used for the synthesis of MAS for easy and ready reckoning.

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“…Magnesium aluminate spinel (MgAl 2 O 4 ) possesses many advantageous properties, including high hardness (16.1 GPa), high melting point (2135 • C), relatively low density (3.58 g/cm 3 ), high chemical inertness, low thermal expansion coefficient, high mechanical strength, and good thermal shock resistance [10,11]. However, both conventional solid-state reaction and wet chemical methods require lengthy processing time and complicated synthesis steps to obtain MgAl 2 O 4 with specific characteristics [12][13][14]. Because ceramic-added MoSi 2 has been extensively investigated, this study aims to prepare molybdenum silicides (Mo 5 Si 3 and Mo 3 Si) and MgAl 2 O 4 composites by a facile fabrication route involving solid-phase combustion reaction with metallothermic reduction.…”

Section: Introductionmentioning

confidence: 99%

Formation of Mo5Si3/Mo3Si–MgAl2O4 Composites via Self-Propagating High-Temperature Synthesis

Yeh

Chen

2019

Molecules

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In situ formation of intermetallic/ceramic composites composed of molybdenum silicides (Mo5Si3 and Mo3Si) and magnesium aluminate spinel (MgAl2O4) was conducted by combustion synthesis with reducing stages in the mode of self-propagating high-temperature synthesis (SHS). The SHS process combined intermetallic combustion between Mo and Si with metallothermic reduction of MoO3 by Al in the presence of MgO. Experimental evidence showed that combustion velocity and temperature decreased with increasing molar content of Mo5Si3 and Mo3Si, and therefore, the flammability limit determined for the reaction at Mo5Si3 or Mo3Si/MgAl2O4 = 2.0. Based upon combustion wave kinetics, the activation energies, Ea = 68.8 and 63.8 kJ/mol, were deduced for the solid-state SHS reactions producing Mo5Si3– and Mo3Si–MgAl2O4 composites, respectively. Phase conversion was almost complete after combustion, with the exception of trivial unreacted Mo existing in both composites and a minor amount of Mo3Si in the Mo5Si3–MgAl2O4 composite. Both composites display a dense morphology formed by connecting MgAl2O4 crystals, within which micro-sized molybdenum silicide grains were embedded. For equimolar Mo5Si3– and Mo3Si–MgAl2O4 composites, the hardness and fracture toughness are 14.6 GPa and 6.28 MPa m1/2, and 13.9 GPa and 5.98 MPa m1/2, respectively.

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Effect of heat treatment conditions on the growth of MgAl2O4 nanoparticles obtained by sol-gel method

Cited by 31 publications

References 33 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

Synthesis of magnesium aluminate spinel—An overview

Formation of Mo5Si3/Mo3Si–MgAl2O4 Composites via Self-Propagating High-Temperature Synthesis

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Effect of heat treatment conditions on the growth of MgAl2O4 nanoparticles obtained by sol-gel method

Cited by 31 publications

References 33 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

Synthesis of magnesium aluminate spinel—An overview

Formation of Mo5Si3/Mo3Si–MgAl2O4 Composites via Self-Propagating High-Temperature Synthesis

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Product

Resources

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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