Surfactant-Assisted Large-Scale Preparation of Crystalline CeO<sub>2</sub> Nanorods

Vantomme, Aurélien; Yuan, Zhong‐Yong; Du, Gaohui; Su, Bao‐Lian

doi:10.1021/la047751p

Cited by 231 publications

(184 citation statements)

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“…There were three kinds of lattice fringes. 0.35 nm, 0.32 nm and 0.31 nm of lattice fringes matched anatase (101) , CeO 2 (111) (Vantomme et al, 2005) and MoO 3 (021) (Jiang and Song, 2007), respectively. It was noted that MoO 3 was not determined by XRD.…”

Section: Tem Resultsmentioning

confidence: 98%

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Jiang

Wang

Xing

et al. 2017

Aerosol Air Qual. Res.

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CeO 2 -MoO 3 /TiO 2 catalysts were prepared by three methods: a single step sol-gel (SG), impregnation (IM) and coprecipitation (CP) method. These catalysts were investigated for selective catalytic reduction (SCR) of NO with NH 3 . The results indicate that the catalyst prepared by the SG method possessed the widest temperature window (about 250-475°C), best SCR activity below 450°C and resistance against 10% H 2 O and 1000 ppm SO 2 at a gas hourly space velocity (GHSV) of 90,000 h -1 . According to the results of BET, XRD, XPS, H 2 -TPR and TEM, it is found that larger BET surface area, more highly dispersed active species of Ce and Mo, presence of more Ce 3+ and chemisorbed oxygen, synergistic effect among ceria, molybdenum and titania, and better redox ability can contribute to the better deNO x performance of the CeO 2 -MoO 3 /TiO 2 catalyst prepared by the SG method, compared with those by the IM and CP methods.

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Section: Tem Resultsmentioning

confidence: 98%

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Jiang

Wang

Xing

et al. 2017

Aerosol Air Qual. Res.

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“…Of particularly interest, the electronic conductivity of CeO 2 can be enhanced four orders of magnitude when its microstructure is changed from the micro-to nanocrystalline region (Chiang et al, 1996). Various aqueous solution-based methods for synthesizing crystallized CeO 2 nanoparticles (Masui et al, 2002a;Hirano et al, 2000;Li et al, 2001;Wu et al, 2002;Zhou et al, 2003;Bumajdad et al, 2004) and 1D, 2D and 3D CeO 2 nanostructures with different morphologies (Vantomme et al, 2005, Zhou et al, 2005, Kuiry et al, 2005, Ho et al, 2005Han et al, 2005;Sun et al, 2006;Zhong et al, 2007) have been investigated. Some of the properties of these materials, such as the dispersibility of the particles (Masui et al, 2002a) and their catalytic properties (Masui et al, 1997;Sun et al, 2006;Zhong et al, 2007) have also been studied.…”

Section: Ceo 2 -Tio 2 Composite As a Catalystmentioning

confidence: 99%

Utilization of Nanoparticles Produced by Aqueous-Solution Methods – Formation of Acid Sites on CeO2-TiO2 Composite and 1-D TiO2 for Dye-Sensitized Solar Cells

Adachi¹,

Nakagawa²,

Murata³

et al. 2012

Smart Nanoparticles Technology

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“…Nevertheless, this process is pH dependent. Hence, if the pH is higher than the isoelectric point of hydrous cerium oxide (pH: 6.75 to 8.00), exchange of OH − group with the surfactant's cation will take place [6,7]. The higher surface area of Ce(IV) will result in a smaller nanoparticle size.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis of Ceria by the Assisted of Cationic Surfactant and Aging Time

2018

MJAS

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This paper presents the synthesis of rare earth cerium(IV) oxide (ceria) via simple precipitation method under room temperature. The two aims of this research are to: (i) synthesise a ceria-based material using simple process and chemicals and (ii) modify the ceria-based material with environmentally friendly elements. In this study, cerium nitrate hexahydrate and sodium hydroxide were utilised as the precursor and precipitant, respectively, to attain desired crystallite size and shape, at a fixed reaction pH of 12. Besides that, common cationic surfactant, cetyl-tri-methyl-ammonium bromide (CTAB), was used to enhance ceria-based material's coveted properties. Furthermore, addition of surfactant and aging time (30 minutes, and 5, 10, 20, and 30 days) were also examined. Findings showed that as aging time increased, crystallite size decreased and production of large agglomerations were not observed. Then, optimum aging time was applied for synthesis of ceria material and modified ceria material, FeCeO 2 /TiO 2 , via impregnation method. These materials were subjected to X-ray diffraction (XRD), CO 2 -TemperatureProgrammed Desorption (CO 2 -TPD), and Field Emission Scanning Electron Microscopy (FESEM) to investigate the mutual effect of surfactant addition and aging time.Keywords: cationic, ceria, crystallite, precipitating, surfactant Abstrak Kajian ini menggambarkan sintesis salah satu unsur nadir bumi iaitu cerium(IV) oksida (ceria), melalui kaedah pemendakan pada suhu bilik. Matlamat kajian ini ialah: (i) sintesis bahan berasaskan ceria menggunakan proses dan bahan kimia yang mudah dan (ii) mengubahsuai bahan berasaskan ceria dengan penambahan unsur-unsur mesra alam. Dalam kajian ini, cerium nitrat heksahidrat dan natrium hidroksida telah digunakan sebagai bahan pemula dan agen pemendakan, supaya saiz dan bentuk yang dikehendaki dapat diperolehi pada pH yang telah ditetapkan iaitu pH 12. Selain itu, bahan tipikal surfaktan kation, cetil-tri-metilammonium bromida (CTAB), telah digunakan untuk memudahkan penghasilan bahan berasakan ceria dengan sifat-sifat yang dikehendaki. Di samping itu, penambahan surfaktan dan kadar masa penuaan (30 minit, dan 5, 10, 20, dan 30 hari) turut dikaji. Hasil penemuan menunjukkan bahawa, apabila kadar masa penuaan ditingkatkan, saiz kristal berkurangan dan penghasilan gumpalan besar tidak ditemui. Justeru, kadar masa penuaan optima dipilih untuk sintesis bahan ceria dan bahan ceria yang diubah suai, Fe-CeO 2 /TiO 2 , melalui kaedah impregnasi. Seterusnya, bahan-bahan ini dianalisis melalui sistem pembelauan sinar-X (XRD), program penjerap bersuhu-CO 2 (CO 2 -TPD), dan mikroskop elektron pengimbas pancaran medan (FESEM) untuk mengkaji kesan penambahan surfaktan dan kadar masa penuaan.Kata kunci: kation, ceria, kristal, pemendakan, surfaktan ISSN -2506Nor Aqilah et al: ROOM TEMPERATURE SYNTHESIS OF CERIA BY THE ASSISTED OF CATIONIC SURFACTANT AND AGING TIME 405 Introduction Rare earth elements are an interesting prospect for research due to its potential of application in ma...

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Surfactant-Assisted Large-Scale Preparation of Crystalline CeO₂ Nanorods

Cited by 231 publications

References 42 publications

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Utilization of Nanoparticles Produced by Aqueous-Solution Methods – Formation of Acid Sites on CeO2-TiO2 Composite and 1-D TiO2 for Dye-Sensitized Solar Cells

Room Temperature Synthesis of Ceria by the Assisted of Cationic Surfactant and Aging Time

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Surfactant-Assisted Large-Scale Preparation of Crystalline CeO2 Nanorods

Cited by 231 publications

References 42 publications

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Utilization of Nanoparticles Produced by Aqueous-Solution Methods – Formation of Acid Sites on CeO2-TiO2 Composite and 1-D TiO2 for Dye-Sensitized Solar Cells

Room Temperature Synthesis of Ceria by the Assisted of Cationic Surfactant and Aging Time

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Surfactant-Assisted Large-Scale Preparation of Crystalline CeO₂ Nanorods