Positive Effects of CeO&lt;sub&gt;2&lt;/sub&gt; Promoter and Co-Reactant/CO on Methanation of CO&lt;sub&gt;2&lt;/sub&gt;-Rich Gas over Ni/SBA-15 Catalyst

Vân, Nguyễn Thị Thuỳ; Lộc, Lưu Cẩm; Anh, Nguyễn Phương; Cuong, Hoang Tien; Tri, Nguyen

doi:10.2320/matertrans.mt-m2020109

Cited by 7 publications

(5 citation statements)

References 51 publications

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“…The larger the value of S BET of the support, the higher the optimal loading of Ni and the higher the number of reduced Ni o (m Ni°) obtained. The BET surface area of the SBA-15 support (639.1 m 2 /g 35 ) is much larger than those of CeO 2 (71.8 m 2 /g) 24 and α-Al 2 O 3 (13.4 m 2 /g). 20 Therefore, the optimal Ni loading on SBA-15 is the highest, and the number of reduced Ni o (m Ni°) of this sample is several times higher than catalysts supported on CeO 2 and α-Al 2 O 3 (0.814 vs 0.266 and 0.124 mmol/g).…”

Section: Methodsmentioning

confidence: 87%

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Phuong

Tri

et al. 2022

ACS Omega

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Ni-based catalysts dispersed on different supports (MgO-α-Al 2 O 3 , CeO 2 , SBA-15, and MgO-SBA-15) were prepared by the impregnation method. Characteristics of the catalysts, including specific surface areas (N 2 physisorption), crystalline phase compositions (powder X-ray diffraction, Raman spectroscopy), reducibility (hydrogen temperature-programmed reduction, H 2 -TPR), and morphology (scanning electron microscopy (SEM) and transmission electron microscopy, TEM)) were investigated. The activity and stability of the catalysts were tested for the combined steam and CO 2 reforming of methane at 700 °C in a microflow system. The results show that the catalysts exhibit high activity in the BRM reaction. At 700 °C, the conversion of CH 4 and CO 2 reached 86–99% and 67–80%, respectively, in which the Ni/Mg–SBA catalyst is the best with conversions of CH 4 and CO 2 reaching 99% and 80%. Coke accumulation on the surface of the catalysts for 100 h time on stream (TOS) was evaluated by the temperature-programmed oxidation (TPO) technique. The major cause of the catalytic deactivation was elucidated by combining the determination of the amount and type of deposited coke with the changes in the physicochemical properties of the catalysts after the long-term reaction. Almost complete loss of activity was observed on Ni/Mg–Al catalyst after 100 h TOS, while the activity drop was slow on the Ni/Mg–SBA sample, about 15–20% of the total value. Otherwise, the Ni/CeO 2 and Ni/SBA catalysts firmly retained their stable activity for 100 h TOS due to the minimal carbon deposition and stability of these catalysts’ structure. The highly considerable formation of inert C γ carbon and sintering over Ni catalyst supported on MgO-α-Al 2 O 3 were responsible for the lower stability of this catalyst compared to those supported on CeO 2 and SBA-15.

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Section: Methodsmentioning

confidence: 87%

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Phuong

Tri

et al. 2022

ACS Omega

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“…The unique three-dimensional pore structure of KCC-1 is different from other conventional mesoporous silica such as MSN and SBA-15 . The MSN support has a lower specific surface area (355.3 m 2 /g), a larger pore volume (0.569 vs 0.45 cm 3 /g), and a double pore size (4.4 nm), while SBA-15 showed a higher specific surface area (639.1 m 2 /g) and a larger pore size (∼6 nm) compared to KCC-1.…”

Section: Resultsmentioning

confidence: 99%

“…The MSN support has a lower specific surface area (355.3 m 2 /g), a larger pore volume (0.569 vs 0.45 cm 3 /g), and a double pore size (4.4 nm), while SBA-15 showed a higher specific surface area (639.1 m 2 /g) and a larger pore size (∼6 nm) compared to KCC-1. However, when loading the carrier with the optimal Ni content, the specific surface area decreased sharply to 217.1 m 2 /g (66% reduction) in the case of the 39.2Ni/SBA-15 catalyst and to 81.0 m 2 /g (77% reduction) for 44Ni/MSN, and the pore size reduced by half from 4.4 to 2.2 nm, indicating that part of the pores of the carriers have been filled by NiO particles. Meanwhile, the specific surface area of the 25Ni/KCC-1 catalyst decreased by 40% to 314.5 m 2 /g and the pore size of KCC-1 was not subject to change, confirming that the dendritic mesoporous channels of the fibrous KCC-1 was conducive to fabricating the catalysts with high loading amounts of Ni owing to its good accessibility …”

Section: Resultsmentioning

confidence: 99%

“…The unique three-dimensional pore structure of KCC-1 is different from other conventional mesoporous silica such as MSN 37 and SBA-15. 38 The MSN support has a lower specific surface area (355.3 m 2 /g), a larger pore volume (0.569 vs 0.45 cm 3 /g), and a double pore size (4.4 nm), 37 while SBA-15 showed a higher specific surface area (639.1 m 2 /g) and a larger pore size (∼6 nm) compared to KCC-1. However, when loading the carrier with the optimal Ni content, the specific surface area decreased sharply to 217.1 m 2 /g (66% reduction) in the case of the 39.2Ni/SBA-15 catalyst 38 and to 81.0 m 2 /g (77% reduction) for 44Ni/MSN, 24 and the pore size reduced by half from 4.4 to 2.2 nm, 37 indicating that part of the pores of the carriers have been filled by NiO particles.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 95%

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Highly Active and Anticoke Fibrous Silica-Supported Nickel Catalyst for CO₂ Methanation

Hong Phuong,

Do,

Nguyen

et al. 2024

ACS Appl. Energy Mater.

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Simplification holds significant value in both academic studies and industrial applications. Herein, a fibrous KCC-1 material is synthesized by a conventional hydrothermal method. The influence of Ni content, calcination, and activation condition on the characteristics and catalytic performances of Ni/ KCC-1 catalysts in CO 2 methanation was investigated. The physico-chemical properties of the synthesized samples were studied by X-ray diffraction (XRD), energy-dispersive spectrometry (EDS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), isotherm nitrogen adsorption, H 2 -temperature-programmed reduction (H 2 -TPR), temperature-programmed desorption (CO 2 -TPD), and Raman spectroscopy. The highly active, excellent coke-resistant, and stable Ni/KCC-1 was successfully prepared by the impregnation method under milder heat treatment (450 °C-2 h) and activation (450 °C-1 h) conditions compared to the reference catalysts. The dendritic mesoporous channels of the fibrous KCC-1 were conducive for fabrication of fine dispersion catalysts with high loading amounts of Ni. The location of Ni particles over the edges and tops of the fibrous morphology of the KCC-1 support allowed the active sites to be accessible, favoring the interaction between reactants and those active sites. Findings indicated that the obtained catalyst has a high specific surface area, high Ni dispersion, superior reducibility, very high reduction degree, high oxygen vacancy concentration, good thermal stability, and high basicity with dominant medium basic sites. The 25Ni/KCC-1 catalyst had the highest CO 2 conversion (77%) and CH 4 yield (71%) at 375 °C among the tested materials. Compared with the reference Ni/KCC-1 catalysts, the 25Ni/KCC-1 sample synthesized in this study has outstanding advantages, including superior activity and milder conditions of synthesis and activation. Furthermore, high structural stability and excellent coke resistance (0.95% coke accumulated after 100 h time on stream (TOS)) endow the Ni/KCC-1 catalyst with high stability, with stable activity throughout 100 h of TOS.

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“…Accordingly, SBA-15 has previously been used as a support material in NH 3 -SCR catalysts, e.g. , CoO/SBA-15, NiO/SBA-15, Fe 2 O 3 /SBA-15, and CeO 2 /SBA-15. , To improve the dispersion of cerium within the porous silicate matrix, a one-pot method has been applied, which, however, changed the original structure of SBA-15, whereas the use of the wet impregnation (WI) method leads to an uneven distribution of ceria outside/inside the pores and facile aggregation . The solid-state impregnation (SSI) method has been shown to enhance the resistance against thermal aggregation during calcination by strengthening the interaction between metal oxides and the silica support. , In this context, a template P123-assisted SSI method was proposed, which leaves the surfactant template within the SBA-15 matrix during synthesis, forming a confined space for oxide growth.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Mesoporous CuO–CeO₂ Catalysts for NH₃-SCR Applications Guided by Multiple In Situ Spectroscopies

Shen

Lauterbach

Heß

2022

ACS Appl. Mater. Interfaces

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Efficient nontoxic catalysts for low-temperature NH3 selective catalytic reduction (NH3-SCR) applications are of great interest. Owing to their promising redox and low-temperature activity, we prepared CuO–CeO2 catalysts on a mesoporous SBA-15 support using targeted solid-state impregnation (SSI), guided by multiple in situ spectroscopy. The use of template P123 allowed dedicated modification of the surface properties of the SBA-15 matrix, resulting in a changed reactivity behavior of the metal precursors during the calcination process. To unravel the details of the transformation of the precursors to the final catalyst material, we applied in situ diffuse reflectance infrared Fourier transform (DRIFT), UV–visible (UV–vis), and Raman spectroscopies as well as online Fourier transform infrared (FTIR) monitoring of the gas-phase composition, in addition to ex situ surface, porosity, and structural analysis. The in situ analysis reveals two types of nitrate decomposition mechanisms: a nitrate-bridging route leading to the formation of a CuO–CeO2 solid solution with increased low-temperature NH3-SCR activity, and a hydrolysis route, which facilitates the formation of binary oxides CuO + CeO2 showing activity over a broader temperature window peaking at higher temperatures. Our findings demonstrate that a detailed understanding of catalytic performance requires a profound knowledge of the calcination step and that the use of in situ analysis facilitates the rational design of catalytic properties.

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Positive Effects of CeO<sub>2</sub> Promoter and Co-Reactant/CO on Methanation of CO<sub>2</sub>-Rich Gas over Ni/SBA-15 Catalyst

Cited by 7 publications

References 51 publications

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Highly Active and Anticoke Fibrous Silica-Supported Nickel Catalyst for CO₂ Methanation

Rational Design of Mesoporous CuO–CeO₂ Catalysts for NH₃-SCR Applications Guided by Multiple In Situ Spectroscopies

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Positive Effects of CeO<sub>2</sub> Promoter and Co-Reactant/CO on Methanation of CO<sub>2</sub>-Rich Gas over Ni/SBA-15 Catalyst

Cited by 7 publications

References 51 publications

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO2 Reforming of CH4

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO2 Reforming of CH4

Highly Active and Anticoke Fibrous Silica-Supported Nickel Catalyst for CO2 Methanation

Rational Design of Mesoporous CuO–CeO2 Catalysts for NH3-SCR Applications Guided by Multiple In Situ Spectroscopies

Contact Info

Product

Resources

About

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Effect of Support on Stability and Coke Resistance of Ni-Based Catalyst in Combined Steam and CO₂ Reforming of CH₄

Highly Active and Anticoke Fibrous Silica-Supported Nickel Catalyst for CO₂ Methanation

Rational Design of Mesoporous CuO–CeO₂ Catalysts for NH₃-SCR Applications Guided by Multiple In Situ Spectroscopies