Morphology effect of ceria support with hierarchical structure on the catalytic performance for nickel-based catalysts in dry reforming of methane

Gao, Shuqin; Li, Yanan; Guo, Wenzhao; Ding, Xin; Zheng, Lan; Wu, Le; Yan, Hongli; Wang, Yuqi

doi:10.1016/j.mcat.2022.112766

Cited by 10 publications

(11 citation statements)

References 56 publications

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“…The reasons for these interesting observations were discussed in the structure–activity correlation section. The peak fitting of Ce 3d XP spectra shows eight peaks in all of the materials (Figure b). , The complex nature of the Ce 3d XP spectrum is due to the specific interaction of the 2p valence band with the Ce 4f band. The labels u and v correspond to Ce 3d 3/2 and Ce 3d 5/2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, CeO 2 and Nb-CeO 2 materials contain both the Ce 3+ and Ce 4+ species. The higher the amount of Ce 3+ ions, the higher the oxygen vacancies in ceria and vice versa. ,,, To understand this, we estimated the ratio of Ce 3+ to the total number of Ce ions (Ce 3+ + Ce 4+ ). As shown in Figure c, the NbCeNR4 catalyst contains more Ce 3+ species.…”

Section: Resultsmentioning

confidence: 99%

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Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Arun Kumar,

Kamali,

Putla

et al. 2024

ACS Appl. Nano Mater.

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This study showed the dual role of Nb (dopant and active site) in improving the structure−activity properties of shapecontrolled CeO 2 nanorods for the selective synthesis of functional imines and benzimidazoles via oxidative coupling of benzyl alcohols with anilines and o-phenylenediamines, respectively. The powder Xray diffraction (XRD) studies showed the lattice contraction of fluorite ceria due to the replacement of larger Ce 4+ (0.97 Å) by smaller Nb 5+ (0.74 Å) in the lattice, providing more defects (Ce 3+ and oxygen vacancies), as elucidated by XPS studies. The dispersion of Nb 2 O 5 on the surface of Nb-doped CeO 2 nanorods provided strong acid sites, as confirmed by pyridine-adsorbed Fourier transform infrared (FT-IR) study. The combined effect of oxygen vacancies and acid sites could promote the activation of molecular oxygen and benzyl alcohol, respectively, achieving ∼97−99% yields of imine and benzimidazole in the liquid-phase C−N coupling reactions over the Nb-CeO 2 nanorod catalyst calcined at 400 °C (NbCeNR4). The versatile catalytic efficiency of the NbCeNR4 nanomaterial is showcased by synthesizing various functional imines and benzimidazoles with good to excellent yields. The NbCeNR4 nanocatalyst is stable during the reaction as revealed by the hot filtration test and showed good catalytic reusability for 4 cycles. KEYWORDS: shape-controlled Nb 2 O 5 /Ce 1−x Nb x O 2−δ nanocatalyst, oxidative C−N cross-coupling, dual role of Nb, acid sites/oxygen vacancies, structure−activity correlation

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Arun Kumar,

Kamali,

Putla

et al. 2024

ACS Appl. Nano Mater.

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“…This promoting effect was attributed to the presence of large intersheet pores relative to the NPs based catalyst, which has small and randomly distributed pores. Gao et al 17 performance as compared with others. Their characterization results showed that CeO 2 with a dumbbell configuration had more oxygen vacancies, more basic sites, and higher Ni dispersion, which together promoted the reactivity of CH 4 and CO 2 .…”

Section: Introductionmentioning

confidence: 94%

“…This promoting effect was attributed to the presence of large intersheet pores relative to the NPs based catalyst, which has small and randomly distributed pores. Gao et al evaluated the effect of Ni supported on CeO 2 with different morphologies on DRM reaction performance. They showed that Ni supported on specific CeO 2 morphologies provided enhanced catalytic performance as compared with others.…”

Section: Introductionmentioning

confidence: 99%

Application of ZrO₂-Based Hierarchical Nanofibers as a Promoter in Ni Catalyzed Methane Dry Re-Forming

Halabi,

Naser-Eldeen,

Wang

et al. 2024

ACS Appl. Energy Mater.

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In this work, the use of electrospun zirconia nanofibers (NFs), native and doped with 8% mol yttrium, was evaluated for the first time as supports for Ni-based hierarchical catalysts in the dry re-forming of methane (DRM). By a thermal annealing process of the as-made fibers to 500−1000 °C, we induce controlled changes to the NFs structural properties, before the introduction of a thin MgAlO x mixed oxide (MO) layer and nickel (Ni) to make hierarchical catalysts for DRM. Analyzing the NFs properties, we find that the grain size of the underlying supports have a strong monotonically increasing correlation to the DRM reaction performance. Specifically, we find that the increase in the ZrO 2 or yttria stabilized zirconia (YSZ) grain size by 2−3 enhances the CH 4 and CO 2 conversions by a factor of 2. We attribute this effect to the efficiency of the contact between the thin MgAlO x MO layer and the underlying supports, and their joint effect on the Ni-catalyzed DRM. We show that the same enhancement does not occur when using a support material based on ZrO 2 nanoparticles (NPs) rather than NFs. High-resolution transmission electron microscopy shows that the Ni NPs were exsolved from the MgAlO x MO thin layer to form a coke and sinterresistant catalyst.

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“…12). 135,141 It has founded that there are two competing oxidation processes for CO production. 34 The first one is methane dehydrogenation and carbon species (C/CH x ) being oxidized by the oxygen vacancies from CGO.…”

Section: Influencing Factors On the Catalytic Performance Of Ni-based...mentioning

confidence: 99%

Recent advances in promoting dry reforming of methane using nickel-based catalysts

Zhu,

Chen,

Zhang

et al. 2024

Catal. Sci. Technol.

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Morphology effect of ceria support with hierarchical structure on the catalytic performance for nickel-based catalysts in dry reforming of methane

Cited by 10 publications

References 56 publications

Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Application of ZrO₂-Based Hierarchical Nanofibers as a Promoter in Ni Catalyzed Methane Dry Re-Forming

Recent advances in promoting dry reforming of methane using nickel-based catalysts

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Morphology effect of ceria support with hierarchical structure on the catalytic performance for nickel-based catalysts in dry reforming of methane

Cited by 10 publications

References 56 publications

Nb2O5/Ce1–xNbxO2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Nb2O5/Ce1–xNbxO2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Application of ZrO2-Based Hierarchical Nanofibers as a Promoter in Ni Catalyzed Methane Dry Re-Forming

Recent advances in promoting dry reforming of methane using nickel-based catalysts

Contact Info

Product

Resources

About

Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Nb₂O₅/Ce_1–xNb_xO_2−δ Nanorod Catalyst for Selective Oxidative Coupling of Aromatic Alcohols and Amines

Application of ZrO₂-Based Hierarchical Nanofibers as a Promoter in Ni Catalyzed Methane Dry Re-Forming