Synthesis of ceria nanoparticles in pores of SBA-15: Pore size effect and influence of citric acid addition

Mikheeva, N. N.; Зайковский, В. И.; Mamontov, G. V.

doi:10.1016/j.micromeso.2018.10.013

Cited by 31 publications

(14 citation statements)

References 50 publications

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“…The best sample with the largest peak of Ce 4+ reduction on TPR-H 2 profile referring to the highest extent of cerium reduction was prepared using 50 wt.% of Ce, 30 min stirring duration, high ethanol evaporation temperature and one filling cycle. Note, that similar higher reducibility and defectiveness promising for catalytic and photocatalytic applications were found for small (3-6 nm) ceria particles confined in SBA-15 pores, in contrast to large particles on the surface of this material [ 82 ]. SBA-15-templated ceria was tested in benzene oxidation [ 27 ], and as a support for Au particles in the catalyst for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid important in biomass processing [ 39 ].…”

Section: Ceria Preparation Methods Based On Artificial Templatesmentioning

confidence: 88%

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

et al. 2020

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Porous oxide materials are widely used in environmental catalysis owing to their outstanding properties such as high specific surface area, enhanced mass transport and diffusion, and accessibility of active sites. Oxides of metals with variable oxidation state such as ceria and double oxides based on ceria also provide high oxygen storage capacity which is important in a huge number of oxidation processes. The outstanding progress in the development of hierarchically organized porous oxide catalysts relates to the use of template synthetic methods. Single and mixed oxides with enhanced porous structure can serve both as supports for the catalysts of different nature and active components for catalytic oxidation of volatile organic compounds, soot particles and other environmentally dangerous components of exhaust gases, in hydrocarbons reforming, water gas shift reaction and photocatalytic transformations. This review highlights the recent progress in synthetic strategies using different types of templates (artificial and biological, hard and soft), including combined ones, in the preparation of single and mixed oxide catalysts based on ceria, and provides examples of their application in the main areas of environmental catalysis.

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Section: Ceria Preparation Methods Based On Artificial Templatesmentioning

confidence: 88%

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

et al. 2020

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“…The BET of surface area of absorbent increases with the increase in forming of pores on the surface of the absorbent due to optimum crosslinker concentration. The higher forming of pores on the absorbent surface can be attributed to the higher of BET surface area . Large surface area of the absorbent can be achieved with high distribution of porosity on absorbent (RG‐2 wt %, S BET = 377 ± 1 m 2 g −1 ) .…”

Section: Resultsmentioning

confidence: 99%

“…The higher forming of pores on the absorbent surface can be attributed to the higher of BET surface area . Large surface area of the absorbent can be achieved with high distribution of porosity on absorbent (RG‐2 wt %, S BET = 377 ± 1 m 2 g −1 ) . However, beyond 5 wt % of crosslinker used (RG‐6 and RG‐7 wt %), the pores were undeveloped whose values of porosity, pore volume, and RD could not be identified, and then the surface area of the absorbent was reduced ( S BET = 212, 312 m 2 g −1 ).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of rubber gel as oil absorbent by using water as porosity agent for oil removal

Mustapa

Musbah

Sulaiman

et al. 2019

J of Applied Polymer Sci

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Oil pollution is a crucial issue that has adversed impact not only on the environment but also human beings. As an alternative to all conventional approaches, a porous rubber gel based on liquid natural rubber (LNR) with excellent hydrophobic and wettability properties has been developed using a simple vulcanization reaction. To determine their sorption capability, LNR gel was employed for absorption of various types of oils such as Petrol A, Petrol B, kerosene, diesel, crude oil, and olive oil. The functionality of LNR gel was characterized by Fourier transform infrared spectroscopy and the morphology of LNR gel was observed using a scanning electron microscope. By combining wettability and hydrophobicity, the LNR gel exhibited high oil sorption capacity and selectivity for oil removal from water. The LNR gel was able to absorb oils, especially the low viscosity types. Besides, it can also be reused up to 20 cycles while maintaining its oil sorption performance. The selective absorbent shows the recovery of petrol in the range of 96–99% by squeezing the oil. Thus, LNR gel has great potential as green material for cleaning up oil contaminants on a large scale. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47749.

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“…As an alternative, ordered mesoporous CeO 2 -SiO 2 composites attract great interest due to the fact that the ordered mesoporous SiO 2 matrix could not only improve textural stability of CeO 2 but also possess large surface area. The conventional method of obtaining ordered mesoporous CeO 2 /SiO 2 is impregnation of mesoporous silica materials, i.e., MCM-41 (Akondi et al, 2012) and SBA-15 (Mikheeva et al, 2019), with cerium salts. By this method, agglomeration of ceria particles is usually occurred and the blocking of mesopores is inevitable (Bi et al, 2007;Krishnan et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of CeO2 Modified SBA-15 With No Pore Clogging for NO Reduction by CO

Zhang

Tang

et al. 2021

Front. Environ. Chem.

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CeO2 modified SBA-15 composites have been prepared by adding cerium precursor (Ce(NO3)3·6H2O) directly into the mixture of soft template (P123), silica precursor (TEOS) and urea aqueous solution but without mineral acid. The products were characterized by X-ray fluorescence (XRF), powder X-ray diffraction (XRD), N2 physisorption and transmission electron microscopy (TEM). Results indicated that ceria were successfully grafted onto mesoporous silica matrix and no pore clogging was observed. Both ceria content and mesoporous ordering of the final products were found to depend on urea amount. Compared to CeO2/SBA-15 from conventional impregnation method, the one-pot synthesis not only showed simple and green operation, but also superior catalytic performance in NO+CO reaction after loaded with CuO. It was revealed that both the presence and location of ceria had great influence on the reducibility of CuO, and the catalytic performances were intimately related to the redox properties of crystalline CuO. That is, higher NO conversion and N2 selectivity were achieved over catalyst with easier reduction of crystalline CuO.

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Synthesis of ceria nanoparticles in pores of SBA-15: Pore size effect and influence of citric acid addition

Cited by 31 publications

References 50 publications

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

Fabrication of rubber gel as oil absorbent by using water as porosity agent for oil removal

One-Pot Synthesis of CeO2 Modified SBA-15 With No Pore Clogging for NO Reduction by CO

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