Ru-Ba synergistic effect in dual functioning materials for cyclic CO2 capture and methanation

Porta, Alessandro; Visconti, Carlo Giorgio; Castoldi, L.; Matarrese, Roberto; Jeong-Potter, Chae; Farrauto, Robert J.; Lietti, Luca

doi:10.1016/j.apcatb.2020.119654

Cited by 69 publications

(52 citation statements)

References 55 publications

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“…On the Ru sample, the CO 2 desorption profile shows a broad peak with a maximum at 150 °C. This is likely related to bicarbonate species adsorbed on the Al 2 O 3 support, 24 as the presence of 1% Ru does not significantly influence the amount of CO 2 adsorbed in the investigated conditions 10,13 (Table 1).…”

Section: Resultsmentioning

confidence: 91%

“…In both cases, during the CO 2 adsorption step the formation of 25 ppm of CO is observed, likely due to the occurrence of the r-WGS reaction between CO 2 from the gas phase and residual hydrogen adspecies coming from the hydrogenation phase of the previous cycle. 10,19 The negligible In the case of Ru−Na (Figure 5B), 55 ppm of CO can also be detected during the CO 2 capture step. Upon H 2 admission, a very sharp CH 4 peak can be observed.…”

Section: Resultsmentioning

confidence: 98%

“…More detailed information on the experimental setup are available elsewhere. 10 Prior to catalytic testing, each sample was pretreated in situ to decompose the SM precursor salt. The decomposition was carried out in He flow at 500 °C for 30 min (heating rate: 10 °C/min).…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

“…5 Even though the storage material and methanation catalyst can be supported on different particles, it has been shown that dispersing both metals on the same support increases the methane production during isothermal operations. 5,10 Ru, with loadings in the range 1−5 wt %, 10−13 is typically used as methanation catalyst due to its easy reducibility and high methanation activity. 14 Rh at 1 wt % showed improved performances with respect to 5 wt % Ru for DFM applications, but it was ruled out due to economic concerns.…”

Section: Introductionmentioning

confidence: 99%

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Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Porta

Matarrese

Visconti

et al. 2021

Ind. Eng. Chem. Res.

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In this study, a systematic investigation on Dual Functioning Materials (DFMs) for the capture and methanation of CO2 is carried out. The attention is focused on the nature of the CO2 adsorbent component (storage material, SM) varying between alkaline (Li, Na, K) and alkaline-earth (Mg, Ca, Ba) metal oxides in combination with Ru, both supported on an Al2O3 support. Combining gas phase reactivity analysis and FT-IR characterization, the samples are characterized in terms of CO2 storage capacity. It is found that all the SM-containing samples adsorb significant amounts of CO2 as carbonate species, with the higher amounts being adsorbed when the more thermally stable species are formed, i.e., when Ca, Ba, or K are employed as SMs. In all cases, the hydrogenation of the adsorbed carbonates to CH4 occurs at lower temperature, if compared to their thermal desorption. However, in the case of Ca- and Ba-based DFMs, resilient carbonates are present on the material surface. It was found that the SMs able to form the more thermally stable carbonates upon CO2 adsorption also showed the best performances in capture/methanation cycles at 350 °C, even if some residual carbonates were left on the DFM after the hydrogenation step. In particular, the following order of reactivity has in fact been observed in terms of CH4 production: Ru–K ≥ Ru–Ba > Ru–Ca > Ru–Na ≫ Ru–Mg ≅ Ru–Li ≅ Ru. The presence of steam and O2 during the capture step has a detrimental effect on the CO2 adsorption for all samples and, as a result, on CH4 production due to the competition of CO2 and water for the same adsorption sites. Thus, only SMs able to form strongly bound carbonates species upon CO2 exposure can retain significant CO2 storage capacity also in the presence of water in the adsorption feed.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 98%

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Porta

Matarrese

Visconti

et al. 2021

Ind. Eng. Chem. Res.

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“…Among the two noble metals, Ru can achieve higher activity and its price is considerably lower compared to Rh, while it can also provide significant methanation activity when supported on cheap supports (e.g., Al 2 O 3 or TiO 2 ) at a metal loading as low as 1% or even 0.5% [ 20 ]. Ru is also preferable to Ni for application in the combined capture and methanation of CO 2 derived from industrial flue-gases since the high reducibility of RuO x oxides allows for isothermal operation at low temperatures [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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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Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Khatri

Bhatia

2022

AIChE Journal

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The effect of H2, H2O, and CO2 on the NOx removal characteristics of a non‐PGM material (Ag/MgO/γ‐Al2O3) is investigated, which is shown to be active for both NOx adsorption and reduction. H2O facilitates NOx adsorption at early times but inhibits it at longer times. The inhibiting effect of CO2 is observed at low temperatures and is proposed to be due to bicarbonates. However, the inhibiting effect of both H2O and CO2 decreases at higher temperatures. The formation of NO2 at low temperatures is attributed to NO oxidation, and the contribution of stored NOx to NO2 formation increases with temperature. H2O inhibits NH3 oxidation at high temperatures as well as NOx reduction by NH3‐SCR at low temperatures. However, the NOx reduction activity is not affected by CO2. H2 significantly promotes the NH3‐SCR reactions, which is attributed to the facilitation of NOx spillover from the reduced Ag sites to the support.

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Ru-Ba synergistic effect in dual functioning materials for cyclic CO2 capture and methanation

Cited by 69 publications

References 55 publications

Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

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Ru-Ba synergistic effect in dual functioning materials for cyclic CO2 capture and methanation

Cited by 69 publications

References 55 publications

Storage Material Effects on the Performance of Ru-Based CO2 Capture and Methanation Dual Functioning Materials

Storage Material Effects on the Performance of Ru-Based CO2 Capture and Methanation Dual Functioning Materials

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Effect of H2, H2O, and CO2 on the deNOx characteristics of a combined passive NOx adsorber and NOx reduction catalyst

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Product

Resources

About

Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Storage Material Effects on the Performance of Ru-Based CO₂ Capture and Methanation Dual Functioning Materials

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst