Nickel–magnesium-modified cenospheres for CO2 methanation

Summa, Paulina; Montero, David; Samojeden, Bogdan; Motak, Monika; Costa, Patrick Da

doi:10.1016/j.ijhydene.2022.06.094

Cited by 9 publications

(6 citation statements)

References 56 publications

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“…Three types of basic sites were observed: 1) weak basic sites (50-100 °C) due to weak Brønsted sites (like OH groups), where bicarbonate was formed, 2) medium basic sites (100-250 °C) due to bidentate carbonates formed in metal-oxygen pairs, like Mg-O, and 3) strong basic sites (250-550 °C) due to strong basic oxygen anions with low coordination, like those of pure MgO. [37,48] Initially, weak and medium basic sites are considered to favor adsorption, CO 2 activation, and high dispersion of Ni particles, thus improving CO 2 methanation. [37,39] However, the basicity of hydrotalcite-derived mixed oxides is highly dependent on the chemical composition, the presence of promoters, and the type of anions in the interlayers.…”

Section: Characterization Of Dfmsmentioning

confidence: 99%

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Marin,

Parra,

Rios

2023

Energy Tech

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Dual‐function materials (DFM) carry out both the CO2 purification and the reaction with H2, to produce CH4, over the same material and in the same equipment. While noble metals like Ru and Rh have traditionally been the focus of DFM research due to their catalytic activity at low temperatures, they are expensive. Therefore, there is strong interest in discovering more cost‐effective yet highly active catalysts. Herein, improved DFMs are developed by directly reducing Ni‐containing hydrotalcites, without prior air calcination, at moderate temperature. This method results in a high dispersion of Ni as well as in high amounts of small and reduced Ni crystallites with low interaction with the support, which are crucial for the improved behavior observed. The most remarkable and novel result is that these materials show superior CH4 productivity than previously reported DFMs. Under the five operation cycles evaluated, these DFMs exhibit a substantial increase in CO2 capture (1.76 mol kg−1 DFM) and CH4 productivity (0.98 mol kg−1 DFM), in the absence of O2 and water. In the presence of 4.5% O2, both CO2 adsorption and CH4 productivity decrease but they still outperform previous DFMs.

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Section: Characterization Of Dfmsmentioning

confidence: 99%

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Marin,

Parra,

Rios

2023

Energy Tech

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“…[28][29][30][31][32][33][34] Several methods of fly ash utilization have been proposed. [35] Inspiring results have been achieved with application of modified cenosphere in the esterification, [34] CO 2 methanation, [36] photocatalytic degradation of organic pollutants, [37] dry reforming of methane, synthesis of ethyl propionate [39] and hydrogen formation. [40] In this perspective, the development of new Ag NP catalysts supported on fly ash cenosphere looks promising.…”

Section: Introductionmentioning

confidence: 99%

Fly‐Ash Cenosphere as Non‐Porous Ag‐Nanoparticle Support for Epoxidation of Styrene

Tarasova,

Khanov,

Vorobiev

et al. 2024

ChemistrySelect

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The global strategy to reduce waste production implies development of recycling technologies and conversion of various waste into value‐added products. Fly ash is an industrial waste produced in a large amount. It comprised an aluminosilicate cenosphere, which seems perspective as a support for heterogeneous catalysts. Here we report the preparation and application of heterogeneous silver nanocatalysts deposited on cenosphere in the epoxidation reaction, a relevant process for preparation of valuable organic precursors and target chemicals. Reductive wet deposition method yields Ag nano‐dispersed coating of improved quality represented by Ag particles of about 2.7 nm on the surface of the microspheres size of 50–250 microns for catalytic synthesis of styrene‐oxide. The 0.1 mmol/g Ag/cenosphere provided best catalytic results with threefold excess of tret‐butyl hydroperoxide in acetonitrile at 80 °C. Comparison of fly ash cenosphere with other supports suggests that low porosity of microspherical support allows for an easier access of reagents to active sites of the catalyst and significantly increases the yield of epoxide and selectivity of the reaction.

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“…Comparing with conventional C1 sources, such as carbon monoxide (CO) and phosgene, the stable electronic structure in CO 2 and the thermodynamic stability of CO (bond enthalpy 805 kJ/mol) in CO 2 result in a lower reactivity, which calls for a high driving force to ensure its efficient transformation. In the last few decades, although many catalysts have been fabricated for CO 2 catalytic chemical conversion – and various chemicals have been produced with CO 2 as a carbon source, such as carbon monoxide (CO), , methane (CH 4 ), , formaldehyde (HCHO), – formic acid (HCOOH), , methanol (CH 3 OH), – ethanol (C 2 H 5 OH), – and other hydrocarbons, – the efficient conversion of CO 2 into high value-added chemicals under mild conditions is still of significant challenge …”

Section: Introductionmentioning

confidence: 99%

Effective CO₂ Catalytic Conversion by Nitrogen-Rich Covalent Organic Framework-Immobilized Ag Nanoparticles

Li,

Deng,

Wang

et al. 2023

ACS Appl. Nano Mater.

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Taking carbon dioxide (CO 2 ) as a significant C1 source and converting it into value-added chemicals presents a promising strategy for addressing the energy and environmental issues arising from excessive anthropogenic emissions. Nevertheless, catalytic CO 2 conversion, particularly under moderate conditions, remains a formidable challenge. Herein, a composite of Aza-COF-immobilized silver nanoparticles (Ag NPs), Ag/Aza-COF, was successfully fabricated by taking the nitrogen-rich COF, Aza-COF, as the porous carrier. Catalytic experiments revealed that with the presence of Ag/Aza-COF, 100% conversion of 2-methylbut-3-yn-2-ol to the corresponding alkylene cyclic carbonate was achieved after 9 h of reaction at ambient temperature and pressure using CH 3 CN as the solvent. Further studies revealed that the Ag/Aza-COF exhibits very high catalytic activity and effective recyclability in CO 2 fixation with alkynyl alcohol and alkynyl amine at moderate conditions, surpassing the performance of surfactant-protected Ag NPs. X-ray photoelectron spectroscopy and Raman spectral analyses elucidated that strong interactions resulting from the coordination between the nitrogen atoms in the Aza-COF and Ag atoms in Ag NPs prevents their further aggregation and thereby preserving the high activity and recyclability of the composite. This finding demonstrates that the judicious selection of appropriate porous materials to restrict the aggregation of metal particles can yield efficient nanocatalyst composites.

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Nickel–magnesium-modified cenospheres for CO2 methanation

Cited by 9 publications

References 56 publications

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Fly‐Ash Cenosphere as Non‐Porous Ag‐Nanoparticle Support for Epoxidation of Styrene

Effective CO₂ Catalytic Conversion by Nitrogen-Rich Covalent Organic Framework-Immobilized Ag Nanoparticles

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Nickel–magnesium-modified cenospheres for CO2 methanation

Cited by 9 publications

References 56 publications

Improved Dual Function Materials for CO2 Capture and In Situ Methanation

Improved Dual Function Materials for CO2 Capture and In Situ Methanation

Fly‐Ash Cenosphere as Non‐Porous Ag‐Nanoparticle Support for Epoxidation of Styrene

Effective CO2 Catalytic Conversion by Nitrogen-Rich Covalent Organic Framework-Immobilized Ag Nanoparticles

Contact Info

Product

Resources

About

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Improved Dual Function Materials for CO₂ Capture and In Situ Methanation

Effective CO₂ Catalytic Conversion by Nitrogen-Rich Covalent Organic Framework-Immobilized Ag Nanoparticles