Zirconium carbide, hafnium carbide and their ternary carbide nanoparticles by an in situ polymerization route

Chen, Yan; Liu, Rongjun; Zhang, Changrui; Cao, Yingbin

doi:10.1039/c4ra14996c

Cited by 34 publications

(14 citation statements)

References 46 publications

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“…We have tried to use a similar approach for the synthesis of zirconium carboxylates with a variety of carboxylic acids bearing a wide range of carbon atoms in hydrocarbon chain (acetate, octanoate, laurate). The choice of these compounds was based on their usage as a pre-catalyst in an important industrial process of LAO synthesis-Alpha-Sablin (SABIC-Linde) [11]-as well as due to their use for the synthesis of materials with unique properties, such as metal-organic frameworks and catalysts [24][25][26].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Zirconium Pre-Catalysts for Homogeneous Ethylene Oligomerization

et al. 2019

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The catalytic activity of electrochemically synthesized zirconium carboxylates was studied in the process of ethylene oligomerization. Zirconium carboxylates were electrochemically synthesized directly from metallic zirconium and corresponding carboxylic acids (acetic, octanoic and lauric). A comprehensive study (element analysis, nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy, powder X-ray diffraction (PXRD)) of the synthesized zirconium carboxylates showed that these species contain bidentate carboxylate moieties. It was shown that obtained zirconium carboxylates, in combination with Et 3 Al 2 Cl 3 (Al/Zr = 20), have a moderate activity of (7.6-9.9) × 10 3 mol C2H4 ·mol Zr −1 ·h −1 in terms of ethylene oligomerization (at T = 80 • C, p = 20 bar), leading to even-numbered C 4 -C 10 linear alpha-olefins.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Zirconium Pre-Catalysts for Homogeneous Ethylene Oligomerization

et al. 2019

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“…It is notable that the double peaks at 1662 and 1545 cm À1 assigned to the unidentate and bridging complex of COO À become a single peak at 1533 cm À1 after treating at 250°C for 5 hours, suggesting that two coordinating modes of the bonding between UO 2þ 2 and carboxylate groups change to one mode (bridging) after heating at a higher temperature. 32 All above indicate that the dehydroxylation and in situ charring during heat treatments occur with the maintenance of the coordinated structure. 41 It is worth noting that the peak for UO 2þ 2 disappears when the heat-treatment temperature is higher than 300°C.…”

Section: Sem and Tem Analyses Of The Uc Productsmentioning

confidence: 93%

“…Yu et al have described a Pechini‐based process to prepare ordered mesoporous nanocrystalline TiC/C composites. Yan et al also have produced homogeneous nanostructured carbides via an in situ polymerization route. Compared with the conventional solid‐state route, it is more convenient to control the composition, homogeneity, and morphology of the carbides.…”

Section: Introductionmentioning

confidence: 99%

Low‐temperature synthesis of uranium monocarbide by a Pechini‐type in situ polymerizable complex method

et al. 2018

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Uranium monocarbide (UC) was successfully synthesized by the Pechini‐type in situ polymerizable complex technique (IPC) with the organic matter as the only carbon source. In the aqueous process, a mixture of citric acid (CA) and mannitol with UO22+ was polymerized to form a spongy‐like organic polymeric precursor without any precipitations. The structural evolution and formation mechanism of the precursor were investigated using XRD, DSC‐TG, SEM (EDX), TEM, and FT‐IR. XRD results demonstrated that UC was obtained with the UO22+/mannitol/CA molar ratios of 1.0/0.3/1.0 at a low temperature of 1400°C. SEM and TEM analyses revealed that the UO2 nanoparticles were uniformly distributed in the carbon matrix to form UO2/C nanocomposites, and submicrometer‐sized ellipsoidal UC particles cemented together. FT‐IR showed that a UO22+‐CA chelated structure was firstly obtained, achieving the molecular scale mixing of uranium and C. Then the in situ charring guaranteed the intimate contact of UO2 and C, leading to a low reaction temperature in carbothermal reduction owing to a short diffusion distance.

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“…This method has the potential of being industrially flexible in that the precursor uses an aqueous solvent with environmentally benign gelling agents and the viscosity of the solution is tuneable based on the ethylene glycol: citric acid ratio. In contrast to the details provided by Yan et al [159], however, many authors simply state the use of 'an HfC precursor' [206], [207]. The provision of greater detail in the composition and thermodynamics of developmental materials is beneficial to the growth of the area as a whole.…”

Section: Pip Processmentioning

confidence: 99%

Selection, processing, properties and applications of ultra-high temperature ceramic matrix composites, UHTCMCs – a review

Binner

Porter

Baker

et al. 2020

International Materials Reviews

221

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April 1 st 2019 he was also the Deputy Head of the College of Engineering & Physical Sciences. He has been active in ceramics processing research since 1981 and has published ~220 refereed papers, as well as editing or contributing to 19 books and holding 7 patents with an 8 th recently submitted. He has attracted 129 research grants to date, totalling ~£16.5M, this includes a current portfolio of about £1.9M. The focus of his research is the generation of both the necessary scientific understanding and the required engineering solutions for the design and development of materials and process routes that display technical and/or economic advantages over existing approaches. The range of products worked on ranges from nanostructured to traditional ceramics, interpenetrating composites to ultra-high temperature ceramic matrix composites. He has worked closely with industry to translate key developments, e.g. through the creation of a spin-out company to develop a ceramic sensor for measuring soil matric potential (1991), or via licensing, e.g. manufacturing routes for producing engineering ceramic foams (1995) and nanostructured ceramics (2012). He has supervised 35 Ph.D. students and 2 M.Phil. students to successful completion and 38 postdoctoral researchers. A further 7 Ph.D. students and 6 postdoctoral researchers are currently being supervised with more positions currently advertised. His research has received both national and international recognition; he has given ~65 keynotes, plenary and invited talks at international conferences, whilst the Institute of Materials, Minerals and Mining has awarded him the Holliday Prize (1995), Ivor Jenkins Medal

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Zirconium carbide, hafnium carbide and their ternary carbide nanoparticles by an in situ polymerization route

Cited by 34 publications

References 46 publications

Electrochemical Synthesis of Zirconium Pre-Catalysts for Homogeneous Ethylene Oligomerization

Electrochemical Synthesis of Zirconium Pre-Catalysts for Homogeneous Ethylene Oligomerization

Low‐temperature synthesis of uranium monocarbide by a Pechini‐type in situ polymerizable complex method

Selection, processing, properties and applications of ultra-high temperature ceramic matrix composites, UHTCMCs – a review

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