Influence of reduction conditions on the structure-activity relationships of NaNO3-promoted Ni/MgO dual function materials for integrated CO2 capture and methanation

Huang, Pu; Jie, Chen; Fu, Jiali; Yu, Jun; Li, Suqian; Guo, Yanxia; Zhao, Chuanwen; Liu, Jing

doi:10.1016/j.cej.2023.143431

Cited by 25 publications

(7 citation statements)

References 55 publications

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“…The H 2 concentration for catalyst reduction decides the density of catalytic sites, but whether the released CO 2 is converted to CO or CH 4 can hardly be determined. Notice that CO 2 conversion is almost independent of H 2 concentration for catalyst reduction, implying that the selected H 2 concentrations (5–35%) are still too low for efficient NiO reduction since this process is heavily dependent on high temperature or high H 2 partial pressure …”

Section: Resultsmentioning

confidence: 99%

“…Our recent work implies that surface basicity of Ni-CaO DFMs will be affected by the SMSI effect between Ni and CaO, and this depends on the degree of NiO reduction in the H 2 prereduction stage . It is also highlighted that a higher temperature and a greater H 2 concentration favor NiO reduction . In other words, the influence of H 2 concentration for catalyst reduction on NiO reduction, surface basicity, and CO 2 capture would be more prominent at higher values.…”

Section: Resultsmentioning

confidence: 99%

“…58 It is also highlighted that a higher temperature and a greater H 2 concentration favor NiO reduction. 60 In other words, the influence of H 2 concentration for catalyst reduction on NiO reduction, surface basicity, and CO 2 capture would be more prominent at higher values.…”

Section: Optimization Of Operating Parameters 331 Effects Of Operatin...mentioning

confidence: 95%

“…Notice that CO 2 conversion is almost independent of H 2 concentration for catalyst reduction, implying that the selected H 2 concentrations (5−35%) are still too low for efficient NiO reduction since this process is heavily dependent on high temperature or high H 2 partial pressure. 60 The prominent influence of the reaction on the ICCU performance of DFMs has also been highlighted in open documents. Jo and the coauthors investigated the effects of temperature and feed gas concentration on ICCU performance of Ni/CaO catal-sorbents using temperature-programmed surface reaction (TPSR) analyses, and they found that RWGS and methanation reactions depended heavily on temperature and H 2 concentration in feed gas.…”

Section: Effects Of Operating Parameters On In Situ Co 2 Conversionmentioning

confidence: 95%

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Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

Yu,

Wu,

Liu

et al. 2023

Energy Fuels

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Integrated CO2 capture and utilization (ICCU) has been regarded as an innovative strategy to realize large-scale CO2 emission reduction. The rational design of robust dual-function materials (DFMs) and the optimization of operating parameters are essential for the intensification of the ICCU process. In this work, Ni-CaO DFMs pellets with Ni loadings varying in the 1–20 wt % range are prepared for CO production via integrated CO2 capture and reversed water gas shift (RWGS) reaction. The effect of Ni loading on the structure–reactivity relationships of the Ni-CaO DFMs pellets is investigated. CO2 capture capacity decreases noticeably at higher loadings of 15 and 20 wt % due to reduced surface basicity. Increased Ni loading enhances reducibility but results in increased Ni particle size, decreased Ni specific surface area, and inferior Ni dispersion, and CO yield thus increases first and then declines. CO2 conversion and CO selectivity are almost free from the Ni loading effect. The influences of operating parameters on the ICCU performance of the 5Ni-CaO-P DFMs pellets are investigated using an orthogonal experimental design. The influencing degree of the operating parameters on CO2 capture capacity follows the order of H2 concentration for catalyst reduction > reaction temperature > CO2 concentration > weight hourly space velocity (WHSV). Reaction temperature and H2 concentration in the RWGS stage represent the two primary factors affecting the CO2 conversion performance. Multiple linear regression analyses are performed, and regression equations for describing the relationships between the various attributes and predictors are acquired. The optimal combination of the operating variables is identified as the reaction temperature of 650 °C, WHSV of 135 000 mL/(h·gcat), 25% H2 for catalyst reduction, 10% CO2 for capture, and 5% H2 for in situ RWGS. The desired 5Ni-CaO-P sample exhibits a high CO2 uptake of 16.05 mmol of CO2/g, a great CO yield of 5.77 mmol of CO/g, a remarkable CO2 conversion of ∼99%, a great CO selectivity of ∼90%, and good stability in multiple cycles under optimized working conditions. These results will guide the rational design of DFMs pellets and lay the groundwork for their scale-up applications in ICCU.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Optimization Of Operating Parameters 331 Effects Of Operatin...mentioning

confidence: 95%

Section: Effects Of Operating Parameters On In Situ Co 2 Conversionmentioning

confidence: 95%

See 2 more Smart Citations

Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

Yu,

Wu,

Liu

et al. 2023

Energy Fuels

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“…Nevertheless, the activity of granular sorbent may sharply decline due to sintering and the loss of surface area after multiple cyclic carbonation–decarbonation reactions, which is mainly due to the severe grain agglomeration . Metallic oxides, such as Al 2 O 3 , ,, CeO 2 , , and alkali metal salts , , have been extensively employed as binders of MgO sorbents to maintain their CO 2 uptake capacity and long-term stability.…”

Section: Introductionmentioning

confidence: 99%

MgO-Based Granular Sorbent Pelletized by Using Ordered Mesoporous Silica as Binder for Low-Temperature CO₂ Capture

Deng,

Zhou,

Nie

et al. 2024

Energy Fuels

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Cyclic CO 2 adsorption by using MgO as a sorbent at low temperatures is considered a promising route for postcombustion CO 2 capture. However, most MgO-based sorbents are in the form of fine powder and cannot be used in a fluidized bed reactor, and at the same time, suffer from a rapid loss in CO 2 uptake capacity due to the decrease of surface area aroused by pore shrinking and grain sintering. In this study, mesoporous silicas with highly ordered pore structures have been used as binders, for the first time, to fabricate MgO-based sorbent pellets via a simple and scalable extrusion−spheronization approach. The obtained MgObased pellets exhibit high porosity attributed to the nature of the mesoporous binder, leading to a significantly increased stability and CO 2 uptake capacity. Especially for the low-concentration CO 2 that is comparable to the flue gas from a coal-fired power plant, the results show that the ordered mesoporous silica binder provides a remarkable promotion effect and excellent stability in the capture performance. The CO 2 uptake capacity of the best-performing sorbent, 20-KIT-6−100, displays a small decline of 6.86% (from 1.02 mmol of CO 2 /g in the first cycle to 0.95 mmol of CO 2 /g in the 10th cycle). It is envisaged that mesoporous materials hold great potential to be used as binders in reinforcing the metal oxide-based sorbents for flue-gas CO 2 capture in practical applications.

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Revealing the Electrocatalytic Reaction Mechanism of Water Splitting by In Situ Raman Technique

Hu,

Luo,

Zhu

et al. 2024

Advanced Sustainable Systems

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Using renewable energy for water splitting to produce hydrogen is a crucial step toward achieving the dual carbon goals. However, due to the lack of a clear understanding of the precise localization of catalytic active sites and the complex structural evolution of catalysts during actual reaction conditions, there is still a challenge to reveal the electrocatalytic reaction mechanism of water splitting. In situ electrochemical Raman characterization technique can dynamically monitor the structural evolution of catalysts in real time, reveal the dynamic structure‐performance relationship of catalysts during the reaction process, and explore the catalytic reaction mechanism. This paper focuses on reviewing the latest developments in in situ electrochemical Raman characterization technology in terms of active sites on catalyst surfaces, the behavior of interfacial water molecules, and the structure evolution of electrocatalysts. The future development prospect of advanced in situ electrochemical Raman technology is also prospected.

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Influence of reduction conditions on the structure-activity relationships of NaNO3-promoted Ni/MgO dual function materials for integrated CO2 capture and methanation

Cited by 25 publications

References 55 publications

Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

MgO-Based Granular Sorbent Pelletized by Using Ordered Mesoporous Silica as Binder for Low-Temperature CO₂ Capture

Revealing the Electrocatalytic Reaction Mechanism of Water Splitting by In Situ Raman Technique

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Influence of reduction conditions on the structure-activity relationships of NaNO3-promoted Ni/MgO dual function materials for integrated CO2 capture and methanation

Cited by 25 publications

References 55 publications

Investigation on Integrated CO2 Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

Investigation on Integrated CO2 Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

MgO-Based Granular Sorbent Pelletized by Using Ordered Mesoporous Silica as Binder for Low-Temperature CO2 Capture

Revealing the Electrocatalytic Reaction Mechanism of Water Splitting by In Situ Raman Technique

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Product

Resources

About

Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

Investigation on Integrated CO₂ Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

MgO-Based Granular Sorbent Pelletized by Using Ordered Mesoporous Silica as Binder for Low-Temperature CO₂ Capture