Numerical Simulation of CO Methanation for the Production of Synthetic Natural Gas in a Fluidized Bed Reactor

Sun, Libin; Luo, Kun; Fan, Jianren

doi:10.1021/acs.energyfuels.7b01781

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…41 The deposited carbon was confirmed by the XRD patterns, and as seen in Figure 11b, two small diffraction peaks that appeared around 40°belong to Ni Previous studies have reported that the catalytic performance of Ni-based catalysts is influenced by the grain size of Ni particles and the Ni electron density. 31,42 First, according to the XRD and H 2 -TPD results, the outstanding activity of the Ni/La x Ce 1−x O 2−x/2 catalyst was due to the smallest Ni particle size, which contributes to the formation of more active sites as well as increasing H 2 uptakes, ultimately improving the CO methanation activity. 33,43 Second, the Ni electron cloud density was increased for the Ni/La x Ce 1−x O 2−x/2 catalyst, as shown in XPS spectra, which could be considered as the increased number of oxygen vacancies derived from the formation of La−Ce−O linkages.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

et al. 2021

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A group of ternary La x Ce1–x O2–x/2 nanorods with varying La/Ce ratios have been prepared by the hydrothermal strategy and further used to synthesize supported nickel catalysts for CO methanation. The optimal Ni/La0.15Ce0.85O1.925 catalyst showed remarkably improved activity and excellent resistance against coke formation compared with Ni/CeO2. The characterization results demonstrated that doping of La2O3 into CeO2 resulted in decreased grain size of Ni particles and increased Ni electron cloud density induced by the creation of more oxygen vacancies due to substituting La3+ for Ce4+, which were responsible for accelerating CO dissociation and eventually improved CO methanation activity. More importantly, the enhanced oxygen vacancies were helpful to improve the anticoking properties through eliminating the deposited carbon species. These studies shed light on the design of a catalyst with both outstanding activity at low temperatures and reliable stability at high temperatures for the CO methanation reaction.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

et al. 2021

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“…4 ) and Reaction 2 ( Eq. (5) ): ( Er-rbib and Bouallou, 2013 ; König et al, 2015 ; Sun et al, 2017 )

where Rate constants K 1 ( Eq. 6 ) and K 2 ( Eq.…”

Section: Experimental Methodology and Techniquesmentioning

confidence: 99%

K-Promoted Ni-Based Catalysts for Gas-Phase CO2 Conversion: Catalysts Design and Process Modelling Validation

et al. 2021

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The exponential growth of greenhouse gas emissions and their associated climate change problems have motivated the development of strategies to reduce CO2 levels via CO2 capture and conversion. Reverse water gas shift (RWGS) reaction has been targeted as a promising pathway to convert CO2 into syngas which is the primary reactive in several reactions to obtain high-value chemicals. Among the different catalysts reported for RWGS, the nickel-based catalyst has been proposed as an alternative to the expensive noble metal catalyst. However, Ni-based catalysts tend to be less active in RWGS reaction conditions due to preference to CO2 methanation reaction and to the sintering and coke formation. Due to this, the aim of this work is to study the effect of the potassium (K) in Ni/CeO2 catalyst seeking the optimal catalyst for low-temperature RWGS reaction. We synthesised Ni-based catalyst with different amounts of K:Ni ratio (0.5:10, 1:10, and 2:10) and fully characterised using different physicochemical techniques where was observed the modification on the surface characteristics as a function of the amount of K. Furthermore, it was observed an improvement in the CO selectivity at a lower temperature as a result of the K-Ni-support interactions but also a decrease on the CO2 conversion. The 1K catalyst presented the best compromise between CO2 conversion, suppression of CO2 methanation and enhancing CO selectivity. Finally, the experimental results were contrasted with the trends obtained from the thermodynamics process modelling observing that the result follows in good agreement with the modelling trends giving evidence of the promising behaviour of the designed catalysts in CO2 high-scale units.

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“…The temperature should be well controlled in order to guarantee both kinetic rate and production rate. From the simulations and References [9,16,22], the optional temperature should be between 350 • C and 400 • C.…”

Section: Influence Of Initial Temperaturementioning

confidence: 99%

3D Unsteady Simulation of a Scale-Up Methanation Reactor with Interconnected Cooling Unit

2021

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The production of synthetic natural gas (SNG) via methanation has been demonstrated by experiments in bench scale bubbling fluidized bed reactors. In the current work, we focus on the scale-up of the methanation reactor, and a circulating fluidized bed (CFB) is designed with variable diameter according to the characteristic of methanation. The critical issue is the removal of reaction heat during the strongly exothermic process of the methanation. As a result, an interconnected bubbling fluidized bed (BFB) is utilized and connected with the reactor in order to cool the particles and to maintain system temperature. A 3D model is built, and the influences of operating temperature on H2, CO conversion and CH4 yield are evaluated by numerical simulations. The instantaneous and time-averaged flow behaviors are obtained and analyzed. It turns out that the products with high concentrations of CH4 are received at the CFB reactor outlet. The temperature of the system is kept under control by using a cooling unit, and the steady state of thermal behavior is achieved under the cooling effect of BFB reactor. The circulating rate of particles and the cooling power of the BFB reactor significantly affect the performance of reactor. This investigation provides insight into the design and operation of a scale-up methanation reactor, and the feasibility of the CFB reactor for the methanation process is confirmed.

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Numerical Simulation of CO Methanation for the Production of Synthetic Natural Gas in a Fluidized Bed Reactor

Cited by 14 publications

References 22 publications

Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

K-Promoted Ni-Based Catalysts for Gas-Phase CO2 Conversion: Catalysts Design and Process Modelling Validation

3D Unsteady Simulation of a Scale-Up Methanation Reactor with Interconnected Cooling Unit

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Numerical Simulation of CO Methanation for the Production of Synthetic Natural Gas in a Fluidized Bed Reactor

Cited by 14 publications

References 22 publications

Highly Efficient LaxCe1–xO2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

Highly Efficient LaxCe1–xO2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

K-Promoted Ni-Based Catalysts for Gas-Phase CO2 Conversion: Catalysts Design and Process Modelling Validation

3D Unsteady Simulation of a Scale-Up Methanation Reactor with Interconnected Cooling Unit

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Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition

Highly Efficient La_xCe_1–xO_2–x/2 Nanorod-Supported Nickel Catalysts for CO Methanation: Effect of La Addition