In-situ DRIFTS study of two-step CO2 capture and catalytic methanation over Ru,“Na2O”/Al2O3 Dual Functional Material

Proaño, Laura; Tello, Edisson; Arellano-Treviño, Martha A.; Wang, Shuoxun; Farrauto, Robert J.; Cobo, Martha

doi:10.1016/j.apsusc.2019.01.281

Cited by 155 publications

(141 citation statements)

References 45 publications

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“…Ru 0 + δ Ce 4+ →Ru δ + + δ Ce 3+ (6) The presence of oxygen vacancies in the synthesized catalysts is further proved by O 1s spectra as shown in Fig. 6c.…”

Section: Oxygen Vacancies Of Fresh Catalystsmentioning

confidence: 66%

“…Thus, many efforts are being made to developing new technologies for carbon dioxide mitigation [3,4]. Carbon capture and utilization (CCU) is a very promising strategy to reduce CO2 emissions due to CO2 acting as the carbon source can be used to produce value-added products [5,6]. However, the current state-of-art of CCU has several steps including CO2 capture, the regeneration of sorbent, and the conversion of captured CO2.…”

Section: Introductionmentioning

confidence: 99%

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Direct and highly selective conversion of captured CO2 into methane through integrated carbon capture and utilization over dual functional materials

Sun

Zhang

Guan

et al. 2020

Journal of CO2 Utilization

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Excessive atmospheric CO2 emission is regarded as one of the main factors causing global climate change. Thus, there is an urgent need to explore the possibility of CO2 capture and converting the captured CO2 to fuels or value-added products. Recently, an integrated carbon capture and utilization (ICCU) process performed in a single reactor under isothermal conditions draws intensive attentions due to the reduction of energy requirement for sorbent regeneration. However, from literature, normally a low loading of sorbent in dual functional materials (DFMs) was applied resulting in a very low CO2 capture capacity and consequent low CH4 yield in the ICCU process.Herein, we demonstrate the intermediate-temperature DFMs using inexpensive high-capacity MgO sorbent. The synthesized DFMs are a physical mixture of sorbent and Ru/CeO2 catalyst by the mass ratio of 2:1 allowing simultaneous regeneration of sorbent and conversion of CO2 in a single reactor at 300 ˚C. During the 1 st cycle of ICCU process, 10Ru/CeO2-MgO exhibits the best ICCU performance with the highest CH4 yield of 7.07 mmol g -1 and CO2 conversion of 89%. However, after 10 cycles of ICCU process, 5Ru/CeO2-MgO exhibits the highest CH4 yield (3.36 mmol g -1 ) and CO2 conversion (79%), which are much higher than that of 2.5Ru/CeO2-MgO (1.14 mmol g -1 and 39%) and 10Ru/CeO2-MgO (2.31 mmol g -1 and 69%). It is mainly attributed to that more oxygen vacancies are remained in 5Ru/CeO2-MgO resulted from the metal-support interaction.

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“…Ru 0 + δ Ce 4+ →Ru δ + + δ Ce 3+ (6) The presence of oxygen vacancies in the synthesized catalysts is further proved by O 1s spectra as shown in Fig. 6c.…”

Section: Oxygen Vacancies Of Fresh Catalystsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Direct and highly selective conversion of captured CO2 into methane through integrated carbon capture and utilization over dual functional materials

Sun

Zhang

Guan

et al. 2020

Journal of CO2 Utilization

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“…During adsorption on Cr 15 /ZSM‐5 at 25 °C, a single peak was observed at 1625 cm −1 (Figure 2g), which could be attributed to the vibrational mode of carbonate species. [ 40 ] It is important to note here that, in the chromium oxide sample, the peaks at lower wavelengths, which were observed in the other single oxide monoliths, were not present. Moreover, during desorption at 200 °C, all vibrational modes completely disappeared (Figure 2h).…”

Section: Resultsmentioning

confidence: 82%

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

Lawson

Farsad

Adebayo

et al. 2020

Advanced Sustainable Systems

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Oxidative propane dehydrogenation using CO2 (CO2‐ODHP) is a potential alternative for propylene synthesis. In this study, bifunctional catalysts (V2O5, ZrO2, Cr2O3, and Ga2O3 doped H‐ZSM‐5) are synthesized through additive manufacturing for CO2‐ODHP. Characterization and correlation between the various characterizations and the catalytic results indicates that the direct 3D printing of metal oxides alongside H‐ZSM‐5 can considerably modify the surface properties and bulk oxide phase dispersion, thus leading to enhanced metal oxide reducibility and exceptional CO2‐ODHP performance. Among the metal monoliths, the mixed oxide sample with 5 wt% Cr, 10 wt% V, 10 wt% Zr, 10 wt% Ga and 65 wt% H‐ZSM‐5 displays the best activity, achieving ≈40% propane conversion, 95% propylene selectivity, and zero benzene/toluene/xylene production. Upon eliminating CO2, the catalyst monoliths all retain their long‐term stability; however, the propane conversions decrease by ≈3% and the propylene selectivities decreased by 5–15%. Nevertheless, all five samples examined here demonstrate exceptional catalytic activities and prolonged stabilities, which are attributed to the even distribution of surface acid sites produced by direct printing of the oxide and zeolite components. Overall, this study presents a novel way of manufacturing bifunctional structured catalysts that exhibit exceptional ODHP performance.

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“…The mechanism behind the two-step CO 2 capture and methanation process over the 5% Ru, 10% Na 2 CO 3 /γ-Al 2 O 3 (or 5% Ru, 6.1% "Na 2 O"/γ-Al 2 O 3 ) DFM was highlighted by Proaño et al [116] employing in-situ DRIFTS (Figure 9). After calcination and pre-reduction of the materials, Na 2 CO 3 was decomposed and Na-rich surface, as well as Al-O − -Na + sites, were created and denoted as "Na 2 O".…”

Section: Ru-based Dual-function Materialsmentioning

confidence: 96%

“…Proposed CO 2 methanation mechanism over 5%Ru/Al 2 O 3 (down) and extended (up and down) for over 5%Ru, 6.1%"Na 2 O"/Al 2 O 3 DFM. Reproduced with permission from ref [116]…”

mentioning

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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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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In-situ DRIFTS study of two-step CO2 capture and catalytic methanation over Ru,“Na2O”/Al2O3 Dual Functional Material

Cited by 155 publications

References 45 publications

Direct and highly selective conversion of captured CO2 into methane through integrated carbon capture and utilization over dual functional materials

Direct and highly selective conversion of captured CO2 into methane through integrated carbon capture and utilization over dual functional materials

A Novel Method of 3D Printing High‐Loaded Oxide/H‐ZSM‐5 Catalyst Monoliths for Carbon Dioxide Reduction in Tandem with Propane Dehydrogenation

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

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