The role of surface properties in CO<sub>2</sub> methanation over carbon-supported Ni catalysts and their promotion by Fe

Gonçalves, Liliana P. L.; Sousa, Juliana P. S.; Soares, O.S.G.P.; Bondarchuk, Oleksandr; Lebedev, Oleg I.; Kolen’ko, Yury V.; Pereira, M.F.R.

doi:10.1039/d0cy01254h

Cited by 23 publications

(45 citation statements)

References 49 publications

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“…In this sense, and in line with the remarks made above, the BCCe30Ni20 catalysts clearly exhibited the best catalytic performance. The best Ni loading of 20 wt.% is in agreement with the results reported in previous studies for Ni-based catalysts supported on different materials [6,15].…”

Section: Effect Of Nickel Loadingsupporting

confidence: 91%

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Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

et al. 2021

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Ceria- and urea-doped activated biochars were used as support for Ni-based catalysts for CO2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO2 methanation experiments—carried out at 0.35–1.0 MPa and 300–500 °C—it was found that the most suitable catalyst was a wheat-straw-derived activated biochar loaded with 30 wt.% of CeO2 and 20 wt.% of Ni. Using this catalyst, a CO2 conversion of 65% with a CH4 selectivity of 95% was reached at 1.0 MPa, 400 °C, and 13,200 h−1. From the study of the influence of the gas hourly space velocity, it was deduced that the most likely reaction mechanism was a reverse water–gas shift reaction, followed by CO hydrogenation. N-doping of the carbon support as an alternative to the use of ceria was also investigated. However, both CO2 conversion and selectivity toward CH4 values were clearly lower than those obtained for the ceria-containing catalyst cited above. The outcomes of this work indicate that a renewable biomass-derived support can be effectively employed in the catalytic conversion of CO2 to methane.

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Section: Effect Of Nickel Loadingsupporting

confidence: 91%

“…The reaction is highly exothermic and generally carried out in the temperature range of 200−500 • C. However, CO 2 conversion toward CH 4 involves high activation energies, which make the reaction less likely at relatively low temperatures [6]. Therefore, the use of an appropriate catalyst is mandatory.…”

Section: Introductionmentioning

confidence: 99%

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

et al. 2021

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“…Carbon is another type of support in heterogeneous catalysis, which has been deemed as inactive regarding CO2 methanation when using Ni-based catalysts [72]. However, Gonçalves et al [73] managed to improve the performance of activated carbon (AC) supported Ni catalysts by modifying the surface chemistry of carbon and by introducing Fe as a second metal. They reported that 5% Fe addition on a 15% Ni catalyst supported on activated carbon with increased basicity (AC-R) improved the catalytic performance Carbon is another type of support in heterogeneous catalysis, which has been deemed as inactive regarding CO 2 methanation when using Ni-based catalysts [72].…”

Section: Promotion With Fementioning

confidence: 99%

“…They reported that 5% Fe addition on a 15% Ni catalyst supported on activated carbon with increased basicity (AC-R) improved the catalytic performance Carbon is another type of support in heterogeneous catalysis, which has been deemed as inactive regarding CO 2 methanation when using Ni-based catalysts [72]. However, Gonçalves et al [73] managed to improve the performance of activated carbon (AC) supported Ni catalysts by modifying the surface chemistry of carbon and by introducing Fe as a second metal. They reported that 5% Fe addition on a 15% Ni catalyst supported on activated carbon with increased basicity (AC-R) improved the catalytic performance for CO 2 methanation.…”

Section: Promotion With Fementioning

confidence: 99%

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Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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CO2 methanation has recently emerged as a process that targets the reduction in anthropogenic CO2 emissions, via the conversion of CO2 captured from point and mobile sources, as well as H2 produced from renewables into CH4. Ni, among the early transition metals, as well as Ru and Rh, among the noble metals, have been known to be among the most active methanation catalysts, with Ni being favoured due to its low cost and high natural abundance. However, insufficient low-temperature activity, low dispersion and reducibility, as well as nanoparticle sintering are some of the main drawbacks when using Ni-based catalysts. Such problems can be partly overcome via the introduction of a second transition metal (e.g., Fe, Co) or a noble metal (e.g., Ru, Rh, Pt, Pd and Re) in Ni-based catalysts. Through Ni-M alloy formation, or the intricate synergy between two adjacent metallic phases, new high-performing and low-cost methanation catalysts can be obtained. This review summarizes and critically discusses recent progress made in the field of bimetallic Ni-M (M = Fe, Co, Cu, Ru, Rh, Pt, Pd, Re)-based catalyst development for the CO2 methanation reaction.

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Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

Abdeta,

Wedajo,

et al. 2024

Advanced Sustainable Systems

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Boron and nitrogen can enter the carbon lattice and provide structural disorder, porous structure, and active sites for better catalyst dispersions and activity. Herein, Bi2Mo2.5(S,O)10 oxysulfide (BiMoOS) anchored on unmodified and surface‐modified activated carbon (AC) via B and N doping is synthesized for efficient PHER, aiming that B and N doping into carbon framework can modify the surface textural features which act as anchoring sites for the host Bi2Mo2.5(S,O)10 and boost its photocatalytic activity by increasing specific surface area via preventing aggregation through a uniform distribution. Thus, the BiMoOS@B─N─AC catalyst achieved excellent stability and PHER performance (564.2 µmol h−1 H2 under visible light). The doped B and N in AC create structural disorder/defects, active sites and induce electron delocalization in B─N─AC, used as the anchoring sites for BiMoOS catalysts and stimulate the adsorption and activation kinetics of the H2O molecules, and also provide a highly conductive network that enhances charge transport and stability of BiMoOS@B─N─AC. With the advantages of the modified B─N─AC, the oxygen vacancy‐anchored BiMoOS exhibited superb PHER. Hence, B and N co‐doping into the carbon lattice is a promising approach to enriching the anchoring site for boosting metallic nanocatalyst stability and catalytic performance.

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The role of surface properties in CO₂ methanation over carbon-supported Ni catalysts and their promotion by Fe

Abstract: The surface chemistry of the activated carbon supporting material was tailored to investigate the influence of O and N groups as well as O-free Lewis basic sites on the performance...

Cited by 23 publications

References 49 publications

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

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The role of surface properties in CO2 methanation over carbon-supported Ni catalysts and their promotion by Fe

Abstract: The surface chemistry of the activated carbon supporting material was tailored to investigate the influence of O and N groups as well as O-free Lewis basic sites on the performance...

Cited by 23 publications

References 49 publications

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Wheat-Straw-Derived Activated Biochar as a Renewable Support of Ni-CeO2 Catalysts for CO2 Methanation

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi2Mo2.5(S,O)10 Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

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The role of surface properties in CO₂ methanation over carbon-supported Ni catalysts and their promotion by Fe

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution