The Role of Ruthenium in CO2 Capture and Catalytic Conversion to Fuel by Dual Function Materials (DFM)

Wang, Shuoxun; Schrunk, Erik T.; Mahajan, Harshit; Farrauto, Robert J.

doi:10.3390/catal7030088

Cited by 80 publications

(60 citation statements)

References 32 publications

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“…The catalyst then needs to be reactivated under a H 2 -rich gas flow. Ru is most promising in this regard, since the oxidized RuO x layers can be re-reduced under H 2 flow at temperatures where CO 2 capture takes place (< 350 • C), thereby increasing the process energy efficiency by operating both steps isothermally [22]. Oxidized NiO requires more intense reducing environments to be reactivated, depending also on the support used and the type and loading of the adsorbent phase.…”

Section: Alkali and Alkaline Earth Metals As Active Sorbents Phases Imentioning

confidence: 99%

“…Due to its easy reduction once oxidized, ruthenium's role is crucial for isothermal DFM applications and it can provide stable performance [22]. From a kinetic point of view, Ru-based DFMs (5% Ru) appearred to achieve faster hydrogenation rates, even compared to their Rh-based analogues (0.5% Rh), when Na 2 CO 3 (or "Na 2 O") was used as sorbent.…”

Section: Ru-based Dual-function Materialsmentioning

confidence: 99%

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The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

et al. 2020

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CO2 methanation has great potential for the better utilization of existing carbon resources via the transformation of spent carbon (CO2) to synthetic natural gas (CH4). Alkali and alkaline earth metals can serve both as promoters for methanation catalysts and as adsorbent phases upon the combined capture and methanation of CO2. Their promotion effect during methanation of carbon dioxide mainly relies on their ability to generate new basic sites on the surface of metal oxide supports that favour CO2 chemisorption and activation. However, suppression of methanation activity can also occur under certain conditions. Regarding the combined CO2 capture and methanation process, the development of novel dual-function materials (DFMs) that incorporate both adsorption and methanation functions has opened a new pathway towards the utilization of carbon dioxide emitted from point sources. The sorption and catalytically active phases on these types of materials are crucial parameters influencing their performance and stability and thus, great efforts have been undertaken for their optimization. In this review, we present some of the most recent works on the development of alkali and alkaline earth metal promoted CO2 methanation catalysts, as well as DFMs for the combined capture and methanation of CO2.

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Section: Alkali and Alkaline Earth Metals As Active Sorbents Phases Imentioning

confidence: 99%

Section: Ru-based Dual-function Materialsmentioning

confidence: 99%

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

et al. 2020

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“…This renders the molecule uniquely attractive for rapid and large-scale implementation of synthetic natural gas production from CO2, as often discussed in the context of the power-to-gas scenario [13]. Recently, Farrauto et al reported a Ru-based catalyst for combined CO2 capture and methanation, showing a promising scope of unsteady-state operation [14].…”

Section: Introductionmentioning

confidence: 99%

Continuous CO2 capture and reduction in one process: CO2 methanation over unpromoted and promoted Ni/ZrO2

Urakawa

2018

Journal of CO2 Utilization

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The recently demonstrated concept to combine CO2 capture and utilization in one process using isothermal unsteady-state operation, namely CO2 capture and reduction (CCR), was applied for the first time to CO2 methanation using unpromoted and K-or La-promoted Ni/ZrO2 catalysts. Both K and La promoters significantly improve CO2 capture capacity and also CO2 conversion selectivity to methane. The K-promoted catalyst (Ni-K/ZrO2) captures a larger amount of CO2 at high temperature but the capture capacity drops at low temperature due to incomplete catalyst regeneration during the cyclic unsteady-state reaction condition. In contrast, the La-promoted catalyst (Ni-La/ZrO2) shows temperatureindependent CO2 capture capacity and rapid reduction of captured CO2, thus leading to stable CCR performance. The nature of the active sites and mechanistic details were gained by TPR, reductive CO2-TPD and space-and time-resolved operando DRIFTS, holistically elucidating the effects of the promoters and their impacts on CCR activity.

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“…However, this approach cannot be utilized using flue gases since the redox cycles imply the oxidation of metallic Ru by CO2 that is further reduced by H2. In the presence of O2, this cycle cannot take place, and the catalyst becomes inefficient [94].…”

Section: Co2 Valorisation Through the Sabatier Reactionmentioning

confidence: 99%

Policies and Motivations for the CO2 Valorization through the Sabatier Reaction Using Structured Catalysts. A Review of the Most Recent Advances

et al. 2018

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The current scenario where the effects of global warming are more and more evident, has motivated different initiatives for facing this, such as the creation of global policies with a clear environmental guideline. Within these policies, the control of Greenhouse Gase (GHG) emissions has been defined as mandatory, but for carrying out this, a smart strategy is proposed. This is the application of a circular economy model, which seeks to minimize the generation of waste and maximize the efficient use of resources. From this point of view, CO2 recycling is an alternative to reduce emissions to the atmosphere, and we need to look for new business models which valorization this compound which now must be considered as a renewable carbon source. This has renewed the interest in known processes for the chemical transformation of CO2 but that have not been applied at industrial level because they do not offer evident profitability. For example, the methane produced in the Sabatier reaction has a great potential for application, but this depends on the existence of a sustainable supply of hydrogen and a greater efficiency during the process that allows maximizing energy efficiency and thermal control to maximize the methane yield. Regarding energy efficiency and thermal control of the process, the use of structured reactors is an appropriate strategy. The evolution of new technologies, such as 3D printing, and the consolidation of knowledge in the structing of catalysts has enabled the use of these reactors to develop a wide range of possibilities in the field. In this sense, the present review presents a brief description of the main policies that have motivated the transition to a circular economy model and within this, to CO2 recycling. This allows understanding, why efforts are being focused on the development of different reactions for CO2 valorization. Special attention to the case of the Sabatier reaction and in the application of structured reactors for such process is paid.

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The Role of Ruthenium in CO2 Capture and Catalytic Conversion to Fuel by Dual Function Materials (DFM)

Cited by 80 publications

References 32 publications

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

Continuous CO2 capture and reduction in one process: CO2 methanation over unpromoted and promoted Ni/ZrO2

Policies and Motivations for the CO2 Valorization through the Sabatier Reaction Using Structured Catalysts. A Review of the Most Recent Advances

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