CO2 methanation over Ca doped ordered mesoporous Ni-Al composite oxide catalysts: The promoting effect of basic modifier

Xu, Leilei; Yang, Hu; Chen, Mindong; Wang, Fagen; Nie, Dongyang; Lu, Qi; Lian, Xinbo; Chen, Hanxiang; Wu, Mei

doi:10.1016/j.jcou.2017.07.014

Cited by 77 publications

(30 citation statements)

References 61 publications

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“…Ca is also one of the favourite promoters for the CO 2 methanation reaction, with its main functions being the increase in the population of surface basic sites and the alteration of support defect chemistry by introducing oxygen vacancies. Similarly to the Mg doping of Ni-based catalysts supported on ordered mesoporous alumina [65], Ca was also employed as a basic modifier by Xu et al [74]. Ca(NO 3 ) 2 •4H 2 O was introduced during the evaporation-induced self-assembly (EISA) catalyst synthesis.…”

Section: Calcium (Ca)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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Section: Calcium (Ca)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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“…Modification of the support and incorporation of a second metal promote the CO 2 conversion performance, but long‐term stability is still often an issue. Recently, other types of materials with enhanced catalytic performance have also been reported . Given the strong dependence of the catalytic activity on active sites exposure, it is believed that different morphologies of the catalysts will differently contribute to the geometrical exposure of active sites .…”

Section: Introductionmentioning

confidence: 99%

“…Modification of the support [14][15][16][17] and incorporation of as econd metal [18][19][20][21][22] promotet he CO 2 conversion performance,b ut long-term stability is still often an issue.R ecently,o ther types of materials with enhanced catalytic performance have also been reported. [23][24][25][26] Given the strong dependence of the catalytic activity on active sites exposure,iti sbelieved that different morphologies of the catalysts will differently contribute to the geometricale xposure of active sites. [27][28][29][30] Despite its crucialr ole in catalysis,t he effect of catalyst morphology (specifically the geometry and shape of botha ctive metal particles and the support) has so far remained unexplored.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al₂O₃ Nanosheets for Carbon Dioxide Methanation

et al. 2018

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Iron‐promoted nickel on γ‐Al2O3 nanosheets shows enhanced catalytic activity, selectivity, and stability for carbon dioxide methanation, a relevant process for energy storage and transportation (power‐to‐gas) for the future low‐carbon economy. Nanosheet‐type catalysts were synthesized by a two‐step hydrothermal method and characterized by several physicochemical methods. The catalytic activity for CO2 methanation was investigated in the 300–350 °C temperature range at a pressure of 5 bar. A high activity at 300 °C (≈860 molCH4 molNi−1 h−1) and 99 % CH4 selectivity with a stable catalytic performance for more than 50 h were observed for the nanosheets‐based sample promoted with iron. With respect to a commercial methanation catalyst, the Fe‐promoted nanosheets‐based catalyst showed an integral rate of CO2 conversion to methane more than three times higher, with a rate of deactivation 5 times lower at 300 °C. With respect to nanosheets catalysts without the use of Fe as promoter, the rate of CO2 conversion is approximately 5 times higher, and with respect to a catalyst with the same composition, but prepared using a bulk‐type alumina, the activity is approximately 2.5 times higher. There is thus a synergistic role of the unique nanostructure and Fe promotion. The nanosheets structure promotes Ni dispersion, forming small Ni nanoparticles (≈11–13 nm) upon reduction, which are very stable with time on stream and against oxidation. Fe forms an alloy with Ni upon reduction and improves the dispersion and reduction degree. No relation is observed between the quantitative number of basic sites and turnover frequency (TOF) values, but data suggest that the mobility of adsorbed CO2 towards the Ni particles, favored by the weakening of medium‐strong basic sites related to Fe promotion and nanosheets structure, determines the reaction rate and TOF.

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“…As the Sabatier reaction is highly exothermic and results in a decrease in total number of moles, lower temperatures and higher pressures are favorable for CH 4 formation. Due to kinetic limitations, the CO 2 conversion drops sharply for T<600 K, with virtually no CH 4 formation below K

true {CO + 3 normalH}_{2} \vec{0pt0pt \leftarrow} {CH}_{4} {+ normalH}_{2} normalO Δ H_{298}^{\circ} = - 206.1 kJ / mol

true {CO}_{2} {+ normalH}_{2} \vec{0pt0pt \leftarrow} {CO + normalH}_{2} normalO Δ H_{298}^{\circ} = 41.2 kJ / mol

true {CO}_{2} {+ 4 normalH}_{2} \vec{0pt0pt \leftarrow} {CH}_{4} {+ 2 normalH}_{2} normalO Δ H_{298}^{\circ} = - 164.9 kJ / mol

…”

Section: Introductionmentioning

confidence: 99%

“…Thermal management remains one of the main problems, as the overall process is highly exothermic requiring efficient heat removal to drive the CH 4 formation and, importantly, to prevent catalyst deactivation . While operation at the lower temperature range of 500–600 K is beneficial from the point of view of reducing the catalyst deactivation rate, CO 2 conversion is relatively low in this temperature range . It is of crucial importance therefore to increase the CO 2 conversion at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation‐based Study

Currie

Nikolić

Petkovska

et al. 2018

Israel Journal of Chemistry

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Conversion of CO2 into synthetic CH4 via thermocatalytic hydrogenation (the Sabatier reaction), has recently gained increasing interest as a possible route for CO2 utilization and energy storage pathway. Herein, we analyze the possibility of increasing the CO2 conversion through periodic operation of the reactor. The analysis is performed by using the Nonlinear Frequency Response (NFR) method, a recently developed analytical technique, suitable for fast evaluation of periodic reactor operations. The NFR analysis predicts a significant conversion gain (up to 50 %) for certain frequencies of the feed flow rate modulation. This prediction is validated by numerical simulations with a reaction rate expression obtained by CO2 conversion experiments using a Ni/Al2O3 catalysts. Both the NFR analysis and numerical simulations predict that it is possible to obtain 70 % CO2 conversion at 500 K, 5 bar, and average space velocity of 7600 h−1 by a periodic modulation of the feed flow rate, as compared to the corresponding steady state CO2 conversion of 43 %.

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CO2 methanation over Ca doped ordered mesoporous Ni-Al composite oxide catalysts: The promoting effect of basic modifier

Cited by 77 publications

References 61 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

Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al₂O₃ Nanosheets for Carbon Dioxide Methanation

CO₂ Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation‐based Study

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CO2 methanation over Ca doped ordered mesoporous Ni-Al composite oxide catalysts: The promoting effect of basic modifier

Cited by 77 publications

References 61 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

Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al2O3 Nanosheets for Carbon Dioxide Methanation

CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation‐based Study

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Resources

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Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al₂O₃ Nanosheets for Carbon Dioxide Methanation

CO₂ Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation‐based Study