CO2 reforming of methane over Ce-Zr-Ni-Me mixed catalysts

Koubaissy, Bachar; Pietraszek, Agnieszka; Roger, Anne‐Cécile; Kiennemann, A.

doi:10.1016/j.cattod.2010.01.050

Cited by 57 publications

(27 citation statements)

References 15 publications

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“…The addition of small amounts of noble metals, mainly Rh, to the catalyst formulation increased the Ni 2+ reducibility [3][4][5][6][7][8][9] and Ni 0 dispersion [10][11][12], retarded the sintering [9,13], avoided Ni 0 oxidation under steam or oxygen atmosphere [11,14,15], and decreased the activation energy for CH 4 dissociation in Rh/Ni alloys [16]. Consequently, enhanced activities were reported not only in conventional and commercial H 2 and syngas processes such as steam reforming [17,18], autothermal reforming [7,12,17,19,20] and oxyreforming [21][22][23][24], but also in more prone to carbon formation processes such as dry reforming [9,[25][26][27][28][29][30][31], ethanol reforming [32][33][34], biogas reforming [35] and, lastly, in fuel cell devices [17], in which large hydrocarbons were fed in systems operating under transient conditions [36,37]. Indeed, Rh promoted the gasification of adsorbed carbon by steam in the autothermal reforming of isooctane [38] and...…”

Section: Introductionmentioning

confidence: 89%

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Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

Benito

Santo

Grandi

et al. 2015

Applied Catalysis B: Environmental

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Section: Introductionmentioning

confidence: 89%

“…On the other hand, the noble metal can be added to a calcined Ni-HT [36,37,46,56]. Moreover, Rh/Ni ceria-zirconia bulk catalysts were prepared by a pseudo sol-gel method [51,57,58] or by firstly introducing Ni during the sol-gel preparation and after impregnating Rh ions [26,30].…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

Benito

Santo

Grandi

et al. 2015

Applied Catalysis B: Environmental

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“…The Ce/Zr composition is a factor that has a strong influence on the catalytic performance of ceria-zirconia (CZ) in several types of reactions such as the reduction in three-way catalysts [160], the methane partial oxidation, and ethanol/methane reforming [161][162][163].…”

Section: Silica-supported Nickelmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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“…When the excess amount of oxygen is in close proximity to the Ni 0 particles, it will lead to formation of NiO, further reduced again to Ni 0 due to presence of H 2 in gas stream [3]. Moreover, the promoting effect of Ce has been mainly ascribed to its large oxygen storage capacity, which favors the oxidation of the carbon deposits formed upon direct methane decomposition [15,36]. The addition of Ce-species into the hydrotalcite structure was also found to promote the reducibility of the nickel species, and also resulted in the introduction of new strong basic sites (low-coordinated surface O 2− ) and intermediate-strength basic sites (Lewis acid/base pairings), which increased the CO 2 adsorption capacity of the catalysts [15].…”

Section: Catalytic Performance In Dry Methane Reformingmentioning

confidence: 99%

Ce- and Y-Modified Double-Layered Hydroxides as Catalysts for Dry Reforming of Methane: On the Effect of Yttrium Promotion

et al. 2019

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Ce- and Y-promoted double-layered hydroxides were synthesized and tested in dry reforming of methane (CH4/CO2 = 1/1). The characterization of the catalysts was performed using X-ray fluorescence (XRF), X-ray diffraction (XRD), N2 sorption, temperature-programmed reduction in H2 (TPR-H2), temperature-programmed desorption of CO2 (TPD-CO2), H2 chemisorption, thermogravimetric analysis coupled by mass spectrometry (TGA/MS), Raman, and high-resolution transmission electron microscopy (HRTEM). The promotion with cerium influences textural properties, improves the Ni dispersion, decreases the number of total basic sites, and increases the reduction temperature of nickel species. After promotion with yttrium, the increase in basicity is not directly correlated with the increasing Y loading on the contrary of Ni dispersion. Dry reforming of methane (DRM) was performed as a function of temperature and in isothermal conditions at 700 °C for 5 h. For catalytic tests, a slight increase of the activity is observed for both Y and Ce doped catalysts. This improvement can of course be explained by Ni dispersion, which was found higher for both Y and Ce promoted catalysts. During DRM, the H2/CO ratio was found below unity, which can be explained by side reactions occurrence. These side reactions are linked with the increase of CO2 conversion and led to carbon deposition. By HRTEM, only multi-walled and helical-shaped carbon nanotubes were identified on Y and Ce promoted catalysts. Finally, from Raman spectroscopy, it was found that on Y and Ce promoted catalysts, the formed C is less graphitic as compared to only Ce-based catalyst.

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CO2 reforming of methane over Ce-Zr-Ni-Me mixed catalysts

Cited by 57 publications

References 15 publications

Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

Supported Catalysts for CO2 Methanation: A Review

Ce- and Y-Modified Double-Layered Hydroxides as Catalysts for Dry Reforming of Methane: On the Effect of Yttrium Promotion

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