Controllable synthesis and properties of nano-CeO2

Li, Tao; Chen, Xianghong; Yang, Wanjia; Zhou, Guilin

doi:10.1007/s13738-018-1452-6

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…Figure 2a is the XRD spectrum of Ni and NCx composite catalysts prepared by reduction treatment at 400 °C for 1.0 h in H 2 atmosphere. Based on the JCPDS standard cards, obvious XRD peaks are formed at 2 θ =28.6°, 33.1°, 47.5°, 56.3°, 59.1° and 69.4° for the studied NCx composite catalysts, which belong to CeO 2 crystal phase with fluorite structure (JCPDS (34‐0394)) [18] . The XRD peaks formed at 2 θ =37.0°, 43.2° and 62.8° belong to the crystal diffraction peaks of NiO crystal phase, indicating the presence of NiO species not completely reduced in the prepared NCx composite catalysts [19] .…”

Section: Resultsmentioning

confidence: 99%

“…Based on the JCPDS standard cards, obvious XRD peaks are formed at 2θ = 28.6°, 33.1°, 47.5°, 56.3°, 59.1°a nd 69.4°for the studied NCx composite catalysts, which belong to CeO 2 crystal phase with fluorite structure (JCPDS (34-0394)). [18] The XRD peaks formed at 2θ = 37.0°, 43.2°and 62.8°b elong to the crystal diffraction peaks of NiO crystal phase, indicating the presence of NiO species not completely reduced in the prepared NCx composite catalysts. [19] The diffraction peaks at 2θ = 44.5°and 51.8°for the prepared monocomponent [nm] Ni and NCx composite catalysts belong to the crystalline diffraction peak of metal Ni (JCPDS (04-0850)), [17] and the metal Ni XRD peak intensity follows the following order: NC3 < NC1 < NC4 < NC2 < Ni, that is, the crystalline diffraction peak intensity of metal Ni of NC3 catalyst is the weakest.…”

Section: Xrd and Quasi In-situ Xps Characterizationsmentioning

confidence: 91%

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Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

Zhou

et al. 2022

ChemNanoMat

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Ni component can be effectively introduced into CeO 2 by a soft template method to prepare porous NiCe composite catalysts. The reducibility of the catalyst precursors was studied by H 2 -TPR. The physicochemical properties of the prepared NiCe composite catalysts were characterized by XRD, quasi in-situ XPS, BET and TEM. And the catalytic performances of the corresponding NiCe composite catalysts was evaluated by CO 2 catalytic hydrogenation. The synergistic effect of Ni and Ce species can significantly improve the reducibility of the precursors to form CO 2 hydrogenation active sites in the corresponding NiCe composite catalysts. The morphology, pore structure, specific surface area, crystallinity and content of metal Ni species of the prepared NiCe composite catalysts were significantly affected by n Ni /n Ce ratio, which can affect the CO 2 catalytic hydrogenation performances of NiCe composite catalysts. The synergistic effect of Ni and Ce species can also promote the formation of NiCe composite catalyst nanoparticles with small particle size about 5-10 nm. The developed mesoporous structure and high specific surface area can be formed in the prepared NiCe composite catalysts. The NC3 catalyst with a n Ni /n Ce ratio of 3.0 showed the best CO 2 hydroreduction performances and use stability. When the reaction temperature was 300 °C, the CO 2 conversion and CH 4 selectivity can reach 85.6% and 100%, respectively. Even if the reaction temperature rises to 340 °C, the CO 2 conversion and CH 4 selectivity can be maintained at 83.7% and 100% in the continuous reaction of 600 min, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Xrd and Quasi In-situ Xps Characterizationsmentioning

confidence: 91%

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

Zhou

et al. 2022

ChemNanoMat

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“…The higher temperature might promote the dissolution of CeO 2 as well as surface diffusion, which would influence crystal growth. 51 The HRTEM image of the CeO 2 nanoflowers (Figure S9) showed a three-dimensional (3D) growth structure and exhibited clear (111) and ( 200) lattice fringes. The energy-dispersive X-ray (EDX) mapping images in Figure S9e−h also showed that Ce and O elements were mainly within the nanoflowers.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…At 50 °C, the products were mainly nanoflowers (Figure c). The higher temperature might promote the dissolution of CeO 2 as well as surface diffusion, which would influence crystal growth . The HRTEM image of the CeO 2 nanoflowers (Figure S9) showed a three-dimensional (3D) growth structure and exhibited clear (111) and (200) lattice fringes.…”

Section: Resultsmentioning

confidence: 99%

CeO₂ Nanoparticle Transformation to Nanorods and Nanoflowers in Acids with Boosted Oxidative Catalytic Activity

Zhao

Wang

et al. 2021

ACS Appl. Nano Mater.

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Nanoceria (CeO2 nanoparticle) with oxidase-like catalytic activity has been used for a diverse range of analytical, environmental, and nanomedicine applications. In this work, the use of nanoceria for the oxidation of common chromogenic substrates was investigated at low pH, where its activity was greatly enhanced. In addition, the shape of the nanoparticles changed dramatically, yielding nanorods in the presence of adsorbed substrates at pH 1. This work provides an interesting method to synthesize CeO2 nanorods at room temperature. By slightly increasing the reaction temperature, CeO2 nanoflowers were further obtained. This change of shape also affected its catalytic activity, with the nanorods being the most active. The physical and chemical properties of the nanoceria materials were characterized by various spectroscopic, microscopic, and electrochemical techniques. The increased activity at low pH was due to the promoted release of the oxidation product, as well as increased oxygen vacancy concentration and enhanced electron transfer. This work has deepened our understanding of nanoceria as a catalyst, enhanced its catalytic activity, and provided a useful way of controlling its morphology.

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CeCu composite oxide for chlorophenol effective removal by heterogeneous catalytic wet peroxide oxidation

Xie

Zeng

Zhou

2019

Environ Sci Pollut Res

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Controllable synthesis and properties of nano-CeO2

Cited by 7 publications

References 42 publications

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

CeO₂ Nanoparticle Transformation to Nanorods and Nanoflowers in Acids with Boosted Oxidative Catalytic Activity

CeCu composite oxide for chlorophenol effective removal by heterogeneous catalytic wet peroxide oxidation

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Controllable synthesis and properties of nano-CeO2

Cited by 7 publications

References 42 publications

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO2 Hydrogenation

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO2 Hydrogenation

CeO2 Nanoparticle Transformation to Nanorods and Nanoflowers in Acids with Boosted Oxidative Catalytic Activity

CeCu composite oxide for chlorophenol effective removal by heterogeneous catalytic wet peroxide oxidation

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Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

Preparation of Porous NiCe Composite Catalyst and Its Performance for CO₂ Hydrogenation

CeO₂ Nanoparticle Transformation to Nanorods and Nanoflowers in Acids with Boosted Oxidative Catalytic Activity