Monodispersed and nanostructrured Ni/SiO2 catalyst and its activity for non oxidative methane activation

Moya, Silvia F.; Martins, Ruth L.; Schmal, Martín

doi:10.1016/j.apcata.2011.02.007

Cited by 32 publications

(21 citation statements)

References 44 publications

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“…The binding energy of Ni 2p 3/2 was 852.1 eV with the corresponding satellite peak at about 857 eV. The binding energy of about 852.1 eV is related to metallic Ni 0 at the surface in good agreement with the literature result (852.0 eV [19]), which indicated the presence of only metallic Ni 0 . No NiSi alloy (853.5 eV [20]) was observed and therefore these species can be discarded at the surface.…”

Section: The Structure Of the Catalystssupporting

confidence: 79%

Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Ding

Yuan

Wang

et al. 2015

Journal of Nanomaterials

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A series of Ni/SiO 2 catalysts with different Ni content were prepared by sol-gel method for application in the synthesis of 2-methyltetrahydrofuran (2-MTHF) by hydrogenation of 2-methylfuran (2-MF). The catalyst structure was investigated by Xray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (TPR). It is found that structures and catalytic performance of the catalysts were highly affected by the Ni content. The catalyst with a 25% Ni content had an appropriate size of the Ni species and larger BET surface area and produced a higher 2-MF conversion with enhanced selectivity in 2-MTHF.

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Section: The Structure Of the Catalystssupporting

confidence: 79%

Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Ding

Yuan

Wang

et al. 2015

Journal of Nanomaterials

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“…XPS analysis was also performed to investigate the oxidation states of Ni at the outer layers of the various samples in Figure 4. Generally, the binding energy of Ni-2p3/2 in the metallic Ni was about 852.4 eV [33,34]. It was unambiguous that there was no metallic Ni present on the samples before reduction.…”

Section: Catalyst Characterizationmentioning

confidence: 77%

Efficient Hydrogenolysis of Guaiacol over Highly Dispersed Ni/MCM-41 Catalyst Combined with HZSM-5

Qiu

Weng

et al. 2016

Catalysts

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Abstract:A series of MCM-41 supported Ni catalysts with high metal dispersion was successfully synthesized by simple co-impregnation using proper ethylene glycol (EG). The acquired Ni-based catalysts performed the outstanding hydrogenolysis activity of guaiacol. The effects of the synthesis parameters including drying temperature, calcination temperature, and metal loading on the physical properties of NiO nanoparticles were investigated through the use of X-ray diffraction (XRD). The drying temperature was found to significantly influence the particle sizes of NiO supported on MCM-41, but the calcination temperature and metal loading had less influence. Interestingly, the small particle size (≤3.3 nm) and the high dispersion of NiO particles were also obtained for co-impregnation on the mixed support (MCM-41:HZSM-5 = 1:1), similar to that on the single MCM-41 support, leading to excellent hydrogenation activity at low temperature. The guaiacol conversion could reach 97.9% at 150 • C, and the catalytic activity was comparative with that of noble metal catalysts. The hydrodeoxygenation (HDO) performance was also promoted by the introduction of acidic HZSM-5 zeolite and an 84.1% yield of cyclohexane at 240 • C was achieved. These findings demonstrate potential applications for the future in promoting and improving industrial catalyst performance.

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“…Usually zirconia, obtained by calcination of Zr(OH) 4 at 923 K, involves two phases: stable monoclinic zirconia (M) and metastable tetragonal zirconia (T). The zirconia obtained by calcination of pure Zr(OH) 4 at 923 K for 3 h is mostly monoclinic, while Ni modified zirconias (where Ni content is equal or greater than 20 wt.%) are predominantly tetragonal in structure. 10 After drying at 373 K for 24 h, the catalyst was calcined in the presence of synthetic air at 923 K for 3 h, at a ramping rate of 1 K min −1 .…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

“…Ni catalysts with 25 wt.% of NiO were prepared by incipient wetness impregnation of Ni(NO 3 ) 2 .6H 2 O, using as ZrO 2 precursor the Zr(OH) 4 (MEL Chemical). Usually zirconia, obtained by calcination of Zr(OH) 4 at 923 K, involves two phases: stable monoclinic zirconia (M) and metastable tetragonal zirconia (T).…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

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Activation of Methane on NiO Nanoparticles with Different Morphologies

Martins¹,

Schmal²

2014

Journal of the Brazilian Chemical Society

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Superfícies nanoestruturadas podem ser definidas como substratos tendo como principal característica dimensões na faixa de 1-100 nm. O recente interesse nestes sistemas é baseado no fato de que novas e interessantes propriedade (catalíticas, magnéticas, ferroelétricas, mecânicas, óticas e eletrônicas) são desenvolvidas como resultado da redução da dimensão destes substratos. Neste trabalho descreve-se a decomposição catalítica do metano em hidrogênio e nanofilamentos de carbono em catalisadores não suportados de Ni preparados por metodologias distintas. Catalisador de Ni suportado em zircônia foi usado para comparação dos resultados. Para os catalisadores não suportados, observou-se forte dependência da atividade do catalisador com o tamanho da partícula do óxido precursor e sua morfologia. Apesar de todos terem apresentado dimensões na faixa de nanopartículas, somente os preparados usando etileno glicol, NiEG, e rota hidrotérmica, NiHT, exibiram a mesma performance que o catalisador suportado (atividade e estabilidade), 25NiZ. O catalisador sintetizado em presença de dimetilglioxima, NiDMG, foi o menos ativo e desativou com o tempo em operação. Nanostructured surfaces can be defined as substrates in which the typical features have dimensions in the range of 1-100 nm. The recent focus of interest in these systems is based on the fact that interesting novel properties (catalytic, magnetic, ferroelectric, mechanical, optical and electronic) are developed as a result of the dimension reductions of these substrates. This paper describes the catalytic methane decomposition into hydrogen and carbon nanofilaments on unsupported Ni catalysts prepared from different methodologies, with controlled particle size and morphologies. Ni catalyst supported on zirconia was also used for performance comparison. For the unsupported catalysts, it was observed strong dependency of catalyst activities with particle size of nickel oxide precursors and their morphologies. Although all of them presented crystallite sizes with nanometric dimensions, only those prepared with ethylene glycol, NiEG, and by hydrothermal condition, NiHT, exhibited the same performance as the supported catalyst (activity and stability), 25NiZ. Catalyst synthesized in the presence of dimethylglyoxime, NiDMG, was less active and deactivated with time on stream.

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Monodispersed and nanostructrured Ni/SiO2 catalyst and its activity for non oxidative methane activation

Cited by 32 publications

References 44 publications

Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Efficient Hydrogenolysis of Guaiacol over Highly Dispersed Ni/MCM-41 Catalyst Combined with HZSM-5

Activation of Methane on NiO Nanoparticles with Different Morphologies

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Monodispersed and nanostructrured Ni/SiO2 catalyst and its activity for non oxidative methane activation

Cited by 32 publications

References 44 publications

Synthesis and Catalytic Performance of Ni/SiO2for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Synthesis and Catalytic Performance of Ni/SiO2for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Efficient Hydrogenolysis of Guaiacol over Highly Dispersed Ni/MCM-41 Catalyst Combined with HZSM-5

Activation of Methane on NiO Nanoparticles with Different Morphologies

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Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Synthesis and Catalytic Performance of Ni/SiO₂for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran