Ceria–zirconia encapsulated Ni nanoparticles for CO<sub>2</sub> methanation

Vrijburg, Wilbert L.; Helden, J.W.A. van; Parastaev, Alexander; Groeneveld, Esther; Pidko, Evgeny A.; Hensen, Emiel J. M.

doi:10.1039/c9cy01428d

Cited by 36 publications

(13 citation statements)

References 59 publications

(69 reference statements)

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“…suppressed the sintering of Ni by encapsulating colloidal Ni NPs into the mesoporous SiO 2 support directly, in which the particle size remained almost unchanged after 70 h reaction. In addition, they further revealed that Ni@CZ catalysts, synthesized by sol‐gel protocol, presented much higher activity and better stability, because that ceria‐zirconia support can encapsulate Ni NPs and prevent their contact [18] . Zhang [19] et al.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, they further revealed that Ni@CZ catalysts, synthesized by solgel protocol, presented much higher activity and better stability, because that ceria-zirconia support can encapsulate Ni NPs and prevent their contact. [18] Zhang [19] et al concluded that the high stability of LaNi 0.95 Co 0.05 O 3 /MCF catalyst was due to the confinement effect of 3-dimensional mesostructured cellular foam silica support, and Ni NPs were physically isolated by the neighboring La 2 O 3 species.…”

Section: Introductionmentioning

confidence: 99%

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Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

et al. 2022

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To improve the low‐temperature activity and anti‐sintering ability of Ni‐based catalyst for CO2 methanation, nickel catalysts supported on ZrO2, CeO2 and Ce−Zr−O solid solutions are prepared via citrate complexation‐impregnation method, and characterized by BET, TPR, CO2‐TPD, H2‐TPD, XRD, XPS, TEM and ICP. The relationship between the structure and catalytic performance is also investigated systematically. The results show that Ni/Ce0.2Zr0.8O2 catalyst exhibits the highest CO2 conversion of 71 % at 250 °C and the highest stability, which is mainly attributed to the high dispersion of active metal nickel and its small particle size. The optimized interaction between Ce−Zr−O solid solution and Ni is in favor of the high dispersion and the stability of Ni nanoparticles on the surface, and enhances the sintering resistance of Ni catalyst. In addition, the similar TOF values of catalysts in different supports indicate that for improving low‐temperature activity of this system, the dispersion of Ni NPs is critical.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

et al. 2022

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“…The deposited coke on the spent 10Ni-10ZrO2/Al2O3 (SI) catalyst was found not only in the lesser amount but also in an easier removal characteristic compared to other catalysts. Considering the O2-TPD and the H2-TPR results, the reason for this easier removal is attributed to the high amount of oxygen mobility accompanied with the greater interaction between Ni and the ZrO2-Al2O3 composite that enhances both the Ni distribution (resulting in smallest Ni particle sizes) and pathway of the vacancy sites for the oxygen transfer from ZrO2 in ZrO2-Al2O3 through coke on the Ni surface in the CRM process [27,28,49]. The coke deposition on the spent catalysts of CSCRM was determined by TPO results (Figure 9).…”

Section: Coke Depositionmentioning

confidence: 99%

The Effect of ZrO2 as Different Components of Ni-Based Catalysts for CO2 Reforming of Methane and Combined Steam and CO2 Reforming of Methane on Catalytic Performance with Coke Formation

2021

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The role of ZrO2 as different components in Ni-based catalysts for CO2 reforming of methane (CRM) has been investigated. The 10 wt.% Ni supported catalysts were prepared with ZrO2 as a support using a co-impregnation method. As a promoter (1 wt.% ZrO2) and a coactive component (10 wt.% ZrO2), the catalysts with ZrO2 were synthesized using a co-impregnation method. To evaluate the effect of the interaction, the Ni catalyst with ZrO2 as a coactive component was prepared by a sequential impregnation method. The results revealed that the activity, the selectivity, and the anti-coking ability of the catalyst depend upon the ZrO2 content, the Ni-ZrO2 interaction, basicity, and oxygen mobility of each catalyst resulting in different Ni dispersion and oxygen transfer pathway from ZrO2 to Ni. According to the characterization and catalytic activation results, the Ni catalyst with low ZrO2 content (as a promoter) presented highest selectivity toward CO owning to the high number of weak and moderate basic sites that enhance the CO2 activation-dissociation. The lowest activity (CH4 conversion ≈ 40% and CO2 conversion ≈ 39%) with the relatively high quantity of total coke formation (the weight loss of the spent catalyst in TGA curve ≈ 22%) of the Ni catalyst with ZrO2 as a support is ascribed to the lowest Ni dispersion due to the poor Ni-ZrO2 interaction and less oxygen transfer from ZrO2 to the deposited carbon on the Ni surface. The effect of a poor Ni-ZrO2 interaction on the catalytic activity was deducted by decreasing ZrO2 content to 10 wt.% (as a coactive component) and 1 wt.% (as a promoter). Although Ni catalysts with 1 wt.% and 10 wt.% ZrO2 provided similar oxygen mobility, the lack of oxygen transfer to coke during CRM process on the Ni surface was still indicated by the growth of carbon filament when the catalyst was prepared by co-impregnation method. When the catalyst was prepared by a sequential impregnation, the intimate interaction of Ni and ZrO2 for oxygen transfer was successfully developed through a ZrO2-Al2O3 composite. The interaction in this catalyst enhanced the catalytic activity (CH4 conversion ≈ 54% and CO2 conversion ≈ 50%) and the oxygen transport for carbon oxidation (the weight loss of the spent catalyst in TGA curve ≈ 7%) for CRM process. The Ni supported catalysts with ZrO2 as a promoter prepared by co-impregnation and with ZrO2 as a coactive component prepared by a sequential impregnation were tested in combined steam and CO2 reforming of methane (CSCRM). The results revealed that the ZrO2 promoter provided a greater carbon resistance (coke = 1.213 mmol·g−1) with the subtraction of CH4 and CO2 activities (CH4 conversion ≈ 28% and CO2 conversion ≈ %) due to the loss of active sites to the H2O activation-dissociation. Thus, the H2O activation-dissociation was promoted more efficiently on the basic sites than on the vacancy sites in CSCRM.

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“…48 Previous studies revealed that the nature of the support and the synthesis method have a strong impact on the observed Ni particle shapes. 49,50 Another primary characterisation tool for the Ni-PSD of Ni/ZrO 2 catalysts is H 2 chemisorption. While this method allows estimating an averaged diameter, the exact ZrO 2 morphology can also strongly impact the average Ni size.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

Impact of small promoter amounts on coke structure in dry reforming of methane over Ni/ZrO₂

Franz

Kühlewind

Shterk

et al. 2020

Catal. Sci. Technol.

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Ceria–zirconia encapsulated Ni nanoparticles for CO₂ methanation

Abstract: Preparing Ni catalysts on ceria–zirconia via colloidal Ni nanoparticle encapsulation yields excellent particle size control, superior catalytic activity, and enhanced stability compared to conventional impregnation techniques.

Cited by 36 publications

References 59 publications

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

The Effect of ZrO2 as Different Components of Ni-Based Catalysts for CO2 Reforming of Methane and Combined Steam and CO2 Reforming of Methane on Catalytic Performance with Coke Formation

Impact of small promoter amounts on coke structure in dry reforming of methane over Ni/ZrO₂

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Ceria–zirconia encapsulated Ni nanoparticles for CO2 methanation

Abstract: Preparing Ni catalysts on ceria–zirconia via colloidal Ni nanoparticle encapsulation yields excellent particle size control, superior catalytic activity, and enhanced stability compared to conventional impregnation techniques.

Cited by 36 publications

References 59 publications

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO2Methanation

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO2Methanation

The Effect of ZrO2 as Different Components of Ni-Based Catalysts for CO2 Reforming of Methane and Combined Steam and CO2 Reforming of Methane on Catalytic Performance with Coke Formation

Impact of small promoter amounts on coke structure in dry reforming of methane over Ni/ZrO2

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Ceria–zirconia encapsulated Ni nanoparticles for CO₂ methanation

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

Stable and Highly Dispersed Nickel Catalysts on Ce‐Zr‐O Solid Solutions for CO₂Methanation

Impact of small promoter amounts on coke structure in dry reforming of methane over Ni/ZrO₂