A sorptive reactor for CO 2 capture and conversion to renewable methane

Miguel, Carlos V.; Soria, M.A.; Mendes, Adélio; Madeira, Luís M.

doi:10.1016/j.cej.2017.04.024

Cited by 83 publications

(52 citation statements)

References 29 publications

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“…The use of hydrotalcite-derived Ni materials has also another important feature, i.e., the combination of a classical CO 2 sorbent (hydrotalcite) [17][18][19] with a methanation Ni catalyst in the same dual functional material [20][21][22]. This opens the door for the integration of CO 2 capture and utilization in the same material, with close active sites, which might be useful for integration in multifunctional reactors, as reported before but with layered catalytic beds [3].…”

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confidence: 83%

“…Among the various strategies considered to avoid CO 2 emissions to the atmosphere, its capture and utilization for the production of fuels or other valuable chemicals seems to be an attractive approach [1,2], particularly methane production in the framework of the so-called power-to-methane (PtM) concept. This concept relies on the storage of surplus renewable power as methane, which can be easily and safely distributed in huge quantities through the existing natural gas infrastructures [3][4][5]. From the technological point of view, PtM combines the catalytic conversion of previously captured CO 2 through the Sabatier reaction with renewable-based H 2 obtained from water electrolysis (cf.…”

Section: Introductionmentioning

confidence: 99%

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CO2 Methanation over Hydrotalcite-Derived Nickel/Ruthenium and Supported Ruthenium Catalysts

et al. 2019

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In this work, in-house synthesized NiMgAl, Ru/NiMgAl, and Ru/SiO 2 catalysts and a commercial ruthenium-containing material (Ru/Al 2 O 3 com. ) were tested for CO 2 methanation at 250, 300, and 350 • C (weight hourly space velocity, WHSV, of 2400 mL N,CO2 ·g −1 ·h −1 ). Materials were compared in terms of CO 2 conversion and CH 4 selectivity. Still, their performances were assessed in a short stability test (24 h) performed at 350 • C. All catalysts were characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), N 2 physisorption at −196 • C, inductively coupled plasma optical emission spectrometry (ICP-OES), and H 2 /CO chemisorption. The catalysts with the best performance (i.e., the hydrotalcite-derived NiMgAl and Ru/NiMgAl) seem to be quite promising, even when compared with other methanation catalysts reported in the literature.Extended stability experiments (240 h of time-on-stream) were performed only over NiMgAl, which was selected based on catalytic performance and estimated price criteria. This catalyst showed some deactivation under conditions that favor CO formation (high temperature and high WHSV, i.e., 350 • C and 24,000 mL N,CO2 ·g −1 ·h −1 , respectively), but at 300 • C and low WHSV, excellent activity (ca. 90% of CO 2 conversion) and stability, with nearly complete selectivity towards methane, were obtained. This is particularly relevant whenever the destination of methane is the injection into gas grid infrastructures, where the content of species like CO should be in accordance with natural gas specifications (typically a content up to 0.5 mol % can be tolerated (e.g., [8])). Hence, highly active and methane-selective catalysts for CO 2 methanation are required. In addition, catalyst stability under dynamic operation, i.e., with the capacity to withstand temperature variations, is also quite important and particularly relevant for application in PtM processes, where the reactor is operated intermittently and whenever surplus renewable power for H 2 production is available [6].Many metals have been tested for CO 2 methanation, for instance, Ni, Ru, Rh, Pd, and Co. Among these, ruthenium and nickel catalysts supported over various materials (e.g., Al 2 O 3 , SiO 2 , TiO 2 , CeO 2 , or ZrO 2 ) stand out [9,10]. Ruthenium-based catalysts have been reported in the literature, as well as in the catalogs of some catalyst suppliers (e.g., [11,12]), to be more suited for operation at low temperatures (T<200 • C), where CO formation is inhibited due to both restricted kinetics and the endothermic nature of the parallel RWGS reaction. On the other hand, nickel-based are the most widely investigated and commercialized catalysts for CO 2 methanation due to their high activity, availability, and low cost [4]. Improvement in their catalytic performance has been reported with hydrotalcite-derived Ni catalysts [13][14][15], as well as when combining nickel with ruthenium in the same bimetallic catalyst [16]. The use of hydrotalcite-derived Ni materials has also another important feature,...

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confidence: 83%

Section: Introductionmentioning

confidence: 99%

CO2 Methanation over Hydrotalcite-Derived Nickel/Ruthenium and Supported Ruthenium Catalysts

et al. 2019

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“…Another option is the use of adsorption/reaction cyclic process to make Synthetic Natural Gas (SNG) from CO 2 . This is the Power-to-Gas concept; in a first step CO 2 from flue gas or other source is adsorbed over hydrotalcites (and concentrated) and in a second step hydrogen from water electrolysis powdered by renewal energy (wind) is fed and methanation reaction occurs producing SNG [38,39]. This second step is the reactive regeneration of the adsorbent (Fig.…”

Section: Carbon Capture and Utilizationmentioning

confidence: 99%

Chemical engineering and environmental challenges. Cyclic adsorption/reaction technologies: Materials and process together!

Rodrigues

2020

Journal of Environmental Chemical Engineering

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“…The current challenges regarding the technologies involved in PtG processes were extensively addressed in recent publications (e.g., [2,9,11,44]), and for that reason were out of the scope of this work, although their study has been the main focus of previous authors (e.g., [45,46]) and future research activities [19]. Instead, the present work aimed to provide a picture of the recent evolution of the Portuguese energy sector, highlighting the tremendous endeavor and commitment of the country for large-scale renewable energy deployment and to raise awareness about what seems to be promising conditions for PtG deployment.…”

Section: Research Needsmentioning

confidence: 99%

An Overview of the Portuguese Energy Sector and Perspectives for Power-to-Gas Implementation

2018

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Energy policies established in 2005 have made Portugal one of the top renewable power producers in Europe, in relative terms. Indeed, the country energy dependence decreased since 2005, although remaining above EU-19 and EU-28 countries in 2015 (77.4% vs. 62.4% vs. 54.0%, respectively). Data collected from governmental, statistical, and companies’ reports and research articles shows that renewables and natural gas assumed a growing importance in the Portuguese energy mix along time, while oil followed an opposite trend. Recently, the country remarkably achieved a full 70-h period in which the mainland power consumed relied exclusively on renewable electricity and has several moments where power production exceeds demand. Currently, the main option for storing those surpluses relies on pumped hydro storage plants or exportation, while other storage alternatives, like Power-to-Gas (PtG), are not under deep debate, eventually due to a lack of information and awareness. Hence, this work aims to provide an overview of the Portuguese energy sector in the 2005–2015 decade, highlighting the country’s effort towards renewable energy deployment that, together with geographic advantages, upholds PtG as a promising alternative for storing the country’s renewable electricity surpluses.

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A sorptive reactor for CO 2 capture and conversion to renewable methane

Cited by 83 publications

References 29 publications

CO2 Methanation over Hydrotalcite-Derived Nickel/Ruthenium and Supported Ruthenium Catalysts

CO2 Methanation over Hydrotalcite-Derived Nickel/Ruthenium and Supported Ruthenium Catalysts

Chemical engineering and environmental challenges. Cyclic adsorption/reaction technologies: Materials and process together!

An Overview of the Portuguese Energy Sector and Perspectives for Power-to-Gas Implementation

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