Effect of Preparation Methods on the Physicochemical and Functional Properties of Ni/CeO2 Catalysts

Матус, Е. В.; Shlyakhtina, A. S.; Sukhova, O. B.; Исмагилов, И.З.; Ушаков, В. А.; Yashnik, S. A.; Nikitin, A. P.; Bharali, Pankaj; Керженцев, М. А.; Исмагилов, З. Р.

doi:10.1134/s002315841902006x

Cited by 18 publications

(10 citation statements)

References 50 publications

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“…Catalysts containing nickel on ceria or ceria–zirconia supports can be prepared by various synthesis techniques that results in samples with different structures and thus different catalytic performance. ,− In SEA, strong electronic forces bind metal precursors to the support, and this interaction is believed to introduce a stronger metal support interaction (SMSI) that persist during subsequent calcination and reduction steps. , Bulk synthesis methods incorporate Ni atoms into the CZ lattice to form a mixed-metal oxide and also induce SMSIs. ,,, …”

Section: Discussionmentioning

confidence: 99%

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Lyu

Jocz

et al. 2020

ACS Catal.

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Ceria–zirconia-supported Ni catalysts (Ni/Ce0.83Zr0.17O2 or Ni/CZ) are prepared by dry impregnation, strong electrostatic adsorption, coprecipitation (CP), and combustion synthesis (CS). The nature and abundance of Ni species in these samples are characterized by X-ray adsorption spectroscopy, temperature-programmed reduction, and CO chemisorption. The bulk synthesis methods (i.e., CP and CS) produce Ni cations that are incorporated into the CZ lattice forming mixed-metal oxides with Ni3+ species at low Ni content. The formation of mixed-metal oxides increases the reducibility of CZ and increases the abundance of active surface oxygen. All NiO/CZ catalysts are active for methane dry reforming and retain some of their activity at a steady state. The initial methane conversion correlates linearly with the fraction of accessible Ni after reduction. The predominant path of catalyst deactivation strongly depends on the structure of the catalyst and, thus, on the synthesis method used. All catalysts experience agglomeration of Ni particles under reaction conditions. Improving the Ni dispersion to isolated species embedded in a support does not improve resistance to Ni particle growth. Coke formation is inversely related to the concentration of active surface oxygen. The dominant deactivation mechanism for catalysts made by CS is the encapsulation of Ni particles by the support.

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Section: Discussionmentioning

confidence: 99%

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Lyu

Jocz

et al. 2020

ACS Catal.

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“…40 In addition, the chemical and the textural properties of the support very often play a key role in the performance of the catalyst. 41 The most commonly studied and employed alumina support phases are γand α-Al 2 O 3. [42][43][44] While an important advantage of α-Al 2 O 3 is its structural stability, due to which it is industrially employed, its low surface area presents a major disadvantage.…”

Section: Introductionmentioning

confidence: 99%

“…The catalytic performance of supported Ni catalysts depends on different factors including Ni‐support interactions, 13,38 Ni particle size, 39 and the type of Ni species on the surface, which affect different characteristics of the catalyst including reducibility 40 . In addition, the chemical and the textural properties of the support very often play a key role in the performance of the catalyst 41 …”

Section: Introductionmentioning

confidence: 99%

Enhanced selectivity of syngas in partial oxidation of methane: A new route for promising Ni‐alumina catalysts derived from Ni/ γ‐AlOOH with modified Ni dispersion

et al. 2020

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Partial oxidation of methane was studied over new Ni nanocatalysts prepared from Ni-impregnated γ-AlOOH, which were compared with their counterparts derived from impregnated γ-Al 2 O 3 and α-Al 2 O 3. The prepared catalysts were characterized by powder X-ray diffraction (XRD), N 2-sorption, H 2-temperatue programmed reduction, scanning electron microscopy, transmission electron microscopy, thermal gravimetric analysis, CO 2-and NH 3-temperatureprogrammed desorption, Raman spectroscopy, CO chemisorption, and diffuse reflectance infrared Fourier transform spectroscopy of adsorbed CO. Employing γ-AlOOH as the support precursor resulted in significantly improved textural properties and catalytic activity. The structure of the support precursor and its surface properties showed a strong influence on the type of Ni active species and their interactions with the support. γ-AlOOH-derived catalysts showed NiO as the dominant Ni species when calcined at 500 C to 650 C, while NiAl 2 O 4 became the sole phase at higher temperatures. On the other hand, mixtures of NiO and NiAl 2 O 4 formed over γ-Al 2 O 3 , calcined before impregnation, regardless of the precalcination temperature. All γ-AlOOHderived catalysts showed higher specific surface areas compared to their counterparts derived from impregnated γ-Al 2 O 3. Upon calcination at moderate temperatures, γ-AlOOH-derived catalysts also showed modified textural and morphological properties of the Ni active particles, including higher Ni dispersion, larger metal surface area, and smaller Ni crystallites. The support precursor and the pretreatment conditions showed a strong influence on the catalytic performance, which was referred to their significant effect on the type of the Ni species and interactions with the support. All catalysts showed higher catalytic activity than the α-Al 2 O 3-derived catalyst, with CH 4 conversion between 86% and 88.5% at 700 C. While γ-AlOOHand γ-Al 2 O 3-derived catalysts calcined at 650 C showed a stable CH 4 conversion around 88%, and higher syngas

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“…A number of nickel catalysts supported on Al 2 O 3 , 11–20 CeO 2 , 17,20–37 MgO, 21,22,30 TiO 2 , 21,22,38 SiO 2 , 13,38–40 and ZrO 2 (ref. 13, 38, and 41–44) have been studied in reforming processes of several renewable feeds, including methanol, 9 ethanol, 14–17,24,26,27,32–34,37,39,41 and glycerol. 11–13,20–23,25,28–31,35,36,38,40,42–44 Al 2 O 3 and CeO 2 as supports are considered effective in terms of high H 2 production and lower coke formation.…”

Section: Introductionmentioning

confidence: 99%

“…The excellent stability of Ni/CeO 2 has been related to accelerated carbon removal from the metal surface due to the mobility of oxygen ions and formation of oxygen vacancies in the support. 46 Recent studies of Ni/CeO 2 systems in reforming processes are related to controlling the functional properties of catalysts through changing the morphology, 32,33,36 preparation methods, 24,28,34,35 active component content, 24 promoters, 26,47 and additives. 27,48,49…”

Section: Introductionmentioning

confidence: 99%

CeO₂-supported Ni and Co catalysts prepared by a solution combustion method for H₂ production from glycerol: the effect of fuel/oxidizer ratio and oxygen excess

Matveyeva¹,

Omarov²,

Gavrilova³

et al. 2023

Catal. Sci. Technol.

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Effect of Preparation Methods on the Physicochemical and Functional Properties of Ni/CeO2 Catalysts

Cited by 18 publications

References 50 publications

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Enhanced selectivity of syngas in partial oxidation of methane: A new route for promising Ni‐alumina catalysts derived from Ni/ γ‐AlOOH with modified Ni dispersion

CeO₂-supported Ni and Co catalysts prepared by a solution combustion method for H₂ production from glycerol: the effect of fuel/oxidizer ratio and oxygen excess

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Effect of Preparation Methods on the Physicochemical and Functional Properties of Ni/CeO2 Catalysts

Cited by 18 publications

References 50 publications

Nickel Speciation and Methane Dry Reforming Performance of Ni/CexZr1–xO2 Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/CexZr1–xO2 Prepared by Different Synthesis Methods

Enhanced selectivity of syngas in partial oxidation of methane: A new route for promising Ni‐alumina catalysts derived from Ni/ γ‐AlOOH with modified Ni dispersion

CeO2-supported Ni and Co catalysts prepared by a solution combustion method for H2 production from glycerol: the effect of fuel/oxidizer ratio and oxygen excess

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Product

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Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

CeO₂-supported Ni and Co catalysts prepared by a solution combustion method for H₂ production from glycerol: the effect of fuel/oxidizer ratio and oxygen excess