Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation

Zeng, Yan; Ma, Hongfang; Zhang, Haitao; Ying, Weiyong; Fang, Dingye

doi:10.2478/pjct-2014-0076

Cited by 8 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second peak could be assigned to β-type NiO species with medium interaction with the catalyst support. Meanwhile, the high-temperature peak is assigned to γ-type NiO species which are NiO particles with strong interaction with the support and the stable nickel aluminate phase with the spinel structure (NiAl 2 O 4 ). , …”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the hightemperature peak is assigned to γ-type NiO species which are NiO particles with strong interaction with the support and the stable nickel aluminate phase with the spinel structure (NiAl 2 O 4 ). 84,85 It was found that all of the as-prepared catalysts 30Ni/ MTK_C, 30Ni/MTK_M, 30Ni−20Ce/MTK_C, and 30Ni− 20Ce/MTK_M contained three types of NiO species, which are α, β, and γ types. Considering the highest reduction peak (β type) of the 30Ni/MTK_M catalyst, the peak was shifted to a lower temperature.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

et al. 2021

View full text Add to dashboard Cite

Natural kaolin-based Ni catalysts have been developed for low-temperature CO2 methanation. The catalysts were prepared via a one-step co-impregnation of Ni and Ce onto a natural kaolin-derived metakaolin using a microwave-assisted hydrothermal method as an acid-/base-free synthesis method. The influences of microwave irradiation and Ce promotion on the catalytic enhancement including the CO2 conversion, CH4 selectivity, and CH4 yield were experimentally investigated by a catalytic test of as-prepared catalysts in a fixed-bed tubular reactor. The relationship between the catalyst properties and its methanation activities was revealed by various characterization techniques including X-ray fluorescence, X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, selected area electron diffraction, transmission electron microscopy, elemental mapping, H2 temperature-programmed reduction, and X-ray absorption near-edge structure analyses. Among the two enhancement methods, microwave and Ce promotion, the microwave-assisted synthesis could produce a catalyst containing highly dispersed Ni particles with a smaller Ni crystallite size and higher catalyst reducibility, resulting in a higher CO2 conversion from 1.6 to 7.5% and a better CH4 selectivity from 76.3 to 79.9% at 300 °C. Meanwhile, the enhancement by Ce addition exhibited a great improvement on the catalyst activities. It was experimentally found that the CO2 conversion increased approximately 7-fold from 7.5 to 52.9%, while the CH4 selectivity significantly improved from 79.9 to 98.0% at 300 °C. Though the microwave-assisted synthesis could further improve the catalyst activities of Ce-promoted catalysts, the Ce addition exhibited a more prominent impact than the microwave enhancement. Cerium oxide (CeO2) improved the catalyst activities through mechanisms of higher CO2 adsorption capacity with its basic sites and the unique structure of CeO2 with a reversible valence change of Ce4+ and Ce3+ and high oxygen vacancies. However, it was found that the catalyst prepared by microwave-assisted synthesis and Ce promotion proved to be the optimum catalyst in this study. Therefore, the present work demonstrated the potential to synthesize a nickel-based catalyst with improved catalytic activities by adding a small amount of Ce as a catalytic promoter and employing microwave irradiation for improving the Ni dispersion.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Moreover, it can improve the active components of the catalysts owing to its characteristics, thus promoting the reforming of hydrogen. Zeng et al [31] studied the effects of Mg, Mn, and La additives on the catalytic performance of Ni-based reforming. They found that the catalysts containing La exhibited smaller Ni particles and better CO adsorption performance after reduction.…”

Section: Particle Size Distribution and Reducibilitymentioning

confidence: 99%

Performance of Ni-Based Catalysts with La Promoter for the Reforming of Methane in Gasification Process

Chen,

Wang

2024

Catalysts

View full text Add to dashboard Cite

The deactivation of active sites caused by high-temperature sintering and the deposition of a large amount of carbon are the main difficulties in the reforming of methane using Ni-based catalysts. La, as a promoter, has an ameliorating effect on the defects of Ni-based catalysts. In this article, the mechanism of action of Ni-based catalysts with the introduction of the rare-earth metal additive La was reviewed, and the effects of La on the methane-reforming performance of Ni-based catalysts were examined. The physical properties, alkalinity, and activity of Ni-based catalysts can be enhanced by the use of the auxiliary agent La, which promotes the conversion of CH4 and CO2 as well as the selectivity towards H2 and CO formation in the reforming of methane. The reason why the Ni-based catalysts could maintain long-term stability in the presence of La was discussed. Furthermore, the current state of research on the introduction of different amounts of La in the reforming of methane at home and abroad was analyzed. It was found that 2–5 wt.% La is the most optimal quantity for improving the catalyst activity and stability, as well as the CO2 chemisorption. The limitations and directions for future research in the reforming of methane were discussed.

show abstract

“…As we all know, the properties of the supported catalyst are greatly determined by the feature of the support. The catalytic support can also greatly impact a lot of characteristics of the catalyst, for instance, the metal–support interaction, acid–base property, redox property, and so forth. Therefore, a lot of newly designed porous materials, such as mesoporous silicates, mesoporous metal oxides, metal–organic frameworks, zeolitic imidazolate frameworks, and so forth are extensively employed as the supports of Ni-based CO 2 methanation catalysts.…”

Section: Introductionmentioning

confidence: 99%

Screening Transition Metals (Mn, Fe, Co, and Cu) Promoted Ni-Based CO₂ Methanation Bimetal Catalysts with Advanced Low-Temperature Activities

Cui

Chen

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The Ni monometallic catalyst usually exhibits poor CO2 methanation activity, although its low cost is beneficial for conducting large-scale application in industries. Herein, the transition metal (Mn, Fe, Co, and Cu)-doped Ni-based bimetallic catalysts loaded on mesoporous Ce0.8Zr0.2O2 solid solution were prepared to address this challenge in CO2 methanation. We found that the Co-doped catalysts exhibited much higher activity than the corresponding counterparts. Therefore, the relationship between the Co/Ni ratio and activity was further investigated to acquire the optimum ratio. The obtained catalysts were characterized by various measurements. The results demonstrated that doping the second transition metals could promote Ni dispersion and strengthen metal–support interaction. Resultantly, serious agglomeration of the metallic active sites was successfully inhibited. Besides, we also carried out the in situ diffuse reflectance infrared spectroscopy and online temperature-programmed surface reaction of CO2 methanation to study the possible reaction intermediates and pathways over the Ni–Co bimetallic catalysts. A dynamic study was also conducted to further study the effect of the doped transition metals on the apparent activation energies. Besides, the present research also revealed that the Ni–Co synergistic effect significantly improved the low-temperature activity by regulating the reaction intermediates. As a result, the Ni–Co bimetallic catalysts supported by mesoporous Ce0.8Zr0.2O2 solid solution were considered as a series of promising and efficient low-temperature CO2 methanation catalysts.

show abstract

Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation

Cited by 8 publications

References 24 publications

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Performance of Ni-Based Catalysts with La Promoter for the Reforming of Methane in Gasification Process

Screening Transition Metals (Mn, Fe, Co, and Cu) Promoted Ni-Based CO₂ Methanation Bimetal Catalysts with Advanced Low-Temperature Activities

Contact Info

Product

Resources

About

Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation

Cited by 8 publications

References 24 publications

Natural Kaolin-Based Ni Catalysts for CO2 Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Natural Kaolin-Based Ni Catalysts for CO2 Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Performance of Ni-Based Catalysts with La Promoter for the Reforming of Methane in Gasification Process

Screening Transition Metals (Mn, Fe, Co, and Cu) Promoted Ni-Based CO2 Methanation Bimetal Catalysts with Advanced Low-Temperature Activities

Contact Info

Product

Resources

About

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Natural Kaolin-Based Ni Catalysts for CO₂ Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis

Screening Transition Metals (Mn, Fe, Co, and Cu) Promoted Ni-Based CO₂ Methanation Bimetal Catalysts with Advanced Low-Temperature Activities