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Synthesis and Characterization of Hollow Strontium Carbonate Pompons by Composite Soft Template Method
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作者 LI Bibo DONG Xiufang +4 位作者 LI Yu SONG Jian XIE Wuxi ZHANG Wei LIU Yunfei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第6期1434-1439,共6页
The hollow strontium carbonate pompons was synthesized for the first time by a controlled reaction precipitation method with sodium dodecyl benzene sulfonate(SDBS)and polyvinyl pyrrolidone(PVP)work together as templat... The hollow strontium carbonate pompons was synthesized for the first time by a controlled reaction precipitation method with sodium dodecyl benzene sulfonate(SDBS)and polyvinyl pyrrolidone(PVP)work together as template.The sampled particles were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),nitrogen adsorption-desorption measurement,X-ray diffraction(XRD),Energy dispersive X-Ray spectroscopy(EDX),Fourier transform infrared spectroscopy(FTIR),Thermogravimetric analysis and differential scanning calorimetry(TGA-DSC),etc.It is shown that the assynthesized hollow strontium carbonate pompons with the size of about 2μm consist of flake-like particles under the optimal reaction conditions.The formation mechanism of hollow strontium carbonate pompons was preliminarily explored. 展开更多
关键词 strontium carbonate hollow structure pompons composite soft template method
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Fabrication and properties of high efficiency luminescent nanorods EuPO_4·H_2O by soft template method 被引量:2
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作者 Tran Thu Huong Tran Kim Anh +3 位作者 Le Thi Vinh W.Strek Hoang Thi Khuyen Le Quoc Minh 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第12期1174-1177,共4页
Europium orthophosphate monohydrate (EuPO4·H2O) nanorods with typical dimensions of about 10-30 nm in diameter and 300-500 nm in length were prepared by using the soft template method. The effects of using diet... Europium orthophosphate monohydrate (EuPO4·H2O) nanorods with typical dimensions of about 10-30 nm in diameter and 300-500 nm in length were prepared by using the soft template method. The effects of using diethylene glycol (DEG) and polyethylene glycol (PEG) polymers as well as the pH values on the size, crystalline structure and morphology of EuPO4·H2O nanorods were investigated. Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) data of the prepared samples were elucidated. The nanorods were highly uniform and their mean length was reduced by using DEG and PEG as soft template agents. For all prepared samples, the rhabdophanetype hexagonal EuPO4·H2O was the dominated phase. The photoluminescence (PL) spectroscopy measurements of EuPO4·H2O nanorods revealed that, under UV excitation, EuPO4·H2O nanorods exhibited strong luminescence with narrow bands corresponding to the intra-4f transitions of ^5D0→^7Fj (j=1, 2, 3, 4) of Eu^3+ ions. The peaks were found at 594 nm (^5D0→^7F1), 619 nm (^5D0→^7F2), 652 nm (^5D0→^7F3), and 697 nm (^5D0→^7F4), with the strongest emission at 594 nm. 展开更多
关键词 soft template method EuPO4·H2O nanorods FLUORESCENCE rare earths
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Characterization and catalytic activity of soft-templated Ni0-CeO_(2) mixed oxides for CO and CO_(2) co-methanation 被引量:2
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作者 Luciano Atzori Maria Giorgia Cutrufello +6 位作者 Daniela Meloni Barbara Onida Delia Gazzoli Andrea Ardu Roberto Monaci Maria Franca Sini Elisabetta Rombi 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2021年第2期251-268,共18页
Nanosized NiO,CeO_(2) and NiO-CeO_(2) mixed oxides with different Ni/Ce molar ratios were prepared by the soft template method.All the samples were characterized by different techniques as to their chemical compositio... Nanosized NiO,CeO_(2) and NiO-CeO_(2) mixed oxides with different Ni/Ce molar ratios were prepared by the soft template method.All the samples were characterized by different techniques as to their chemical composition,structure,morphology and texture.On the catalysts submitted to the same reduction pretreatment adopted for the activity tests the surface basic properties and specific metal surface area were also determined.NiO and CeO_(2) nanocrystals of about 4 nm in size were obtained,regardless of the Ni/Ce molar ratio.The Raman and X-ray photoelectron spectroscopy results proved the formation of defective sites at the NiO-CeO_(2) interface,where Ni species are in strong interaction with the support.The microcalorimetric and Fourier transform infrared analyses of the reduced samples highlighted that,unlike metallic nickel,CeO_(2) is able to effectively adsorb CO_(2),forming carbonates and hydrogen carbonates.After reduction in H2 at 400°C for 1 h,the catalytic performance was studied in the CO and CO_(2) co-methanation reaction.Catalytic tests were performed at atmospheric pressure and 300°C,using CO/CO_(2)/H_(2) molar compositions of 1/1/7 or 1/1/5,and space velocities equal to 72000 or 450000 cm^(3)∙h^(-1)∙gcat^(-1).Whereas CO was almost completely hydrogenated in any investigated experimental conditions,CO_(2) conversion was strongly affected by both the CO/CO_(2)/H_(2) ratio and the space velocity.The faster and definitely preferred CO hydrogenation was explained in the light of the different mechanisms of CO and CO_(2) methanation.On a selected sample,the influence of the reaction temperature and of a higher number of space velocity values,as well as the stability,were also studied.Provided that the Ni content is optimized,the NiCe system investigated was very promising,being highly active for the CO_(x) co-methanation reaction in a wide range of operating conditions and stable(up to 50 h)also when submitted to thermal stress. 展开更多
关键词 soft template method Ni0-CeO_(2)catalystss CO and CO_(2)co-mtharation synthetic natural gas production
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