The effect of synthesis parameters on ordered mesoporous nickel alumina catalyst for CO2 methanation

Aljishi, Ali N.; Veilleux, Gabriel; Lalinde, Jose A. Hernandez; Kopyscinski, Jan

doi:10.1016/j.apcata.2017.10.012

Cited by 54 publications

(39 citation statements)

References 22 publications

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“…Upon mixing with deionized water, the binder (Disperal P2) with an initial particle size of <20 µm disaggregated to less than <20 nm. Detailed analysis of the fresh catalyst are reported by Aljishi et al [20].…”

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

“…Upon mixing with deionized water, the binder (Disperal P2) with an initial particle size of < 20 μm disaggregated to less than < 20 nm. Detailed analysis of the fresh catalyst are reported by Aljishi et al [20]. The catalyst was coated onto a FeCrA-loy plate (100 × 40 mm), which was placed at the bottom of the reactor (more details in section 3).…”

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

“…Ordered mesoporous nickel-alumina (OMA-15Ni) catalyst was synthesized following the evaporation induced self-assembly method used by Aljishi et al [20]. In detail, 1 g of triblock copolymer (Pluronic ® P-123, Sigma Aldrich, Oakville, ON, Canada) was dissolved in 20 mL anhydrous ethanol until a homogeneous solution was obtained.…”

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

“…Before the analysis, the sample was degassed under vacuum for 12 h at 200˝C. For hydrogen uptake (chemisorption), approximately 100 mg of the sample was placed in a U-shaped quartz tube, preheated in He at 120˝C with a heating rate of 20˝C min´1 for 1 h, then reduced with H 2 at its optimum reduction temperature obtained from catalyst H 2 -TPR [20] for another 3 h, then evacuated for 1 h and subsequently cooled to 40˝C, where all measurements were taken at pressures ranging from 50 to 800 mbar. All surface area analyzes were conducted 3 time to assure data accuracy and reproducibility.…”

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

“…Recently, new ordered mesoporous alumina catalysts (OMA) has shown great promise due to high specific surface areas, large pore volumes and uniform pore sizes compared to traditional catalyst systems [20], allowing for a better interaction between the metal-oxide and the support resulting a high metal dispersion.…”

Section: Introductionmentioning

confidence: 99%

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Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

et al. 2018

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Modelling and optimization of chemical reactors require a good understanding of the reactions mechanism with the corresponding kinetic description. Therefore, high quality kinetic data are needed, which can be challenging to obtain, especially for fast and highly exothermic reactions such as the CO 2 methanation. Traditionally, kinetic studies rely on measuring the exit gas composition (1 data point per species and experiment) using differential reactors with diluted catalyst beds and reactants to avoid temperature change. Therefore, an optically accessible catalytic channel reactor was designed, which allowed for the chance to gather spatially-resolved information on axial gas composition and catalyst surface temperature, specifically by means of a movable sampling capillary and shortwave infrared-thermography (SWIR), respectively. A catalyst coated plate was placed at the bottom of the channel, while a set of two quartz glass plates covers the top. In the current study 35 data points per gas species were collect for 1 experiment conducted under laminar flow conditions at 425˝C. Catalyst surface temperature determined via a SWIR camera was not influenced by polyatomic molecules partaking in the reaction and thus did not falsify the kinetic data. The catalyst mass distribution along the reactor axis was determined, enabling the development of a correct reactor model for kinetic parameter estimation and model discrimination.

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Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

Section: Catalyst Coating and Catalyst Mass Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

et al. 2018

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Working diagrams to identify the operating range of a bubbling fluidized bed reactor for the CO₂ methanation

Martin-del-Campo

Kopyscinski

2020

Can J Chem Eng

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Fluidized bed reactors for the catalytic CO 2 methanation is a promising concept within the power-togas (methane) process. Due to the intermittency of renewable electricity generation and thus hydrogen production, the subsequent methanation reactor should also be able to operate at lower feed flow rates, while maintaining fluidized bed conditions. Bubbling fluidized bed reactors offer the required flexibility as shown with the new type of working diagrams. These working diagrams visualize a decision window for (a) determining the reactor diameter and (b) operating the fluidized bed reactor with a turndown ratio of 0.5-1.1. Reducing the turndown ratio (ie, inlet flow rate) could lead to defluidization, thus increasing temperature or reducing the pressure are alternatives to maintain fluidization conditions. The former method is not desired, as a temperature increase would significantly reduce the CH 4 yield due to thermodynamic constraints and therefore reduce the overall efficiency. An industrial CO 2 methanation reactor, for example, that is designed for 10 bara (1 bara = 100 kPa) and 340 C with a total inlet flow rate of 5000 m 3 N Á h −1 (H 2 /CO 2 = 4) can be operated at a turndown ratio of 0.5 (2500 m 3 N Á h −1) at the same temperature and the same u 0 /u mf ratio by reducing the pressure to 5 bara with only a slight decrease in the CO 2 equilibrium conversion from 96.7% to 94.6%.

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MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

et al. 2020

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To address the problems of sintering of Ni particles and poor low‐temperature activity of Ni‐based catalysts for CO methanation, MoOx‐doped (x < 3) ordered mesoporous Ni/Al2O3 catalysts are prepared by two different methods, including the impregnation method and evaporation‐induced self‐assembly (EISA) method. The samples before and after the catalytic reaction are thoroughly characterized by scanning electron microscopy and transmission electron microscopy. The ordered mesoporous structure is retained in all catalysts, whereas the ones prepared by the EISA method demonstrate high specific surface area, small Ni particle size, and high metal dispersion. After reduction in H2 flow, the Mo promoter is in the form of MoOx (x < 3) with the mixed valence of Mo (IV) and Mo (VI), which can increase the density of Ni atomic electron clouds and reduce the Ni particle size. The optimal mesoporous Ni‐Mo/Al2O3 catalyst reaches the maximum CO conversion and CH4 yield of 97.9% and 93.8%, respectively, at 375 °C, 0.1 MPa, and a weight hourly space velocity of 60 000 mL g−1 h−1. In addition, this catalyst demonstrates excellent stability in 100 h‐lifetime test at high space velocity owing to the confinement of the ordered mesoporous structure and the addition of MoOx promoter.

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The effect of synthesis parameters on ordered mesoporous nickel alumina catalyst for CO2 methanation

Cited by 54 publications

References 22 publications

Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

Working diagrams to identify the operating range of a bubbling fluidized bed reactor for the CO₂ methanation

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

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The effect of synthesis parameters on ordered mesoporous nickel alumina catalyst for CO2 methanation

Cited by 54 publications

References 22 publications

Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

Improved Kinetic Data Acquisition Using An Optically Accessible Catalytic Plate Reactor with Spatially-Resolved Measurement Techniques. Case of Study: CO2 Methanation

Working diagrams to identify the operating range of a bubbling fluidized bed reactor for the CO2 methanation

MoOx‐Doped Ordered Mesoporous Ni/Al2O3 Catalyst for CO Methanation

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Product

Resources

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Working diagrams to identify the operating range of a bubbling fluidized bed reactor for the CO₂ methanation

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation