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Determination of the calcium species in coal chars by Ca K-edge XANES analysis

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Chinese Physics C 2013年第2期37卷 102-104页

作者：刘利娟刘慧君崔明启胡永峰郑雷赵屹东马陈燕席识博杨栋亮郭志英王杰 institute of High Energy Physics Chinese Academy of Sciences Department of Chemical Engineering for Energy East China University of Science and Technology Canadian light source University of Saskatchewan

Ca-based additives have been widely used as a sulfur adsorbent during coal pyrolysis and gasification. The Ca speciation and evolution during the pyrolysis of coal with Ca additives have attracted great attention. In this paper, Ca species in the coal chars prepared from the pyrolysis of Ca（OH）2 or CaCO3-added coals are studied by using Ca K-edge X-ray absorption near-edge structural spectroscopy. The results demonstrate that Ca（OH）2 , CaSO4 , CaS and CaO coexist in the Ca（OH）2-added chars, while Ca（OH）2 and CaSO4 are the main species in the Ca（OH）2-added chars. Besides, a carboxyl-bound Ca is also formed during both the pyrolysis for the Ca（OH）2-added and the CaCO3-added coals. A detailed discussion about the Ca speciation is given.

关键词： char pyrolysis calcium K-edge XANES

The mechanical performance and a rate-dependent constitutive model for Al3Ti compound

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Defence Technology（防务技术） 2020年第3期16卷 627-634页

作者： Yang Cao Dan-dan Zhang Jian-xiu Liu Kun Liu Jin-guang Du Wen-bin He Jun Ma Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment Mechanical and Electrical Engineering InstituteZhengzhou University of Light IndustryZhengzhou450002China

The Al3Ti compound has potential application in the high temperature structure materials due to its low density,high strength and *** mechanical behaviors of the material under different loading rates were studied using compression *** results indicate that Al3Ti is a typical brittle material and its compressive strength is dependent on the strain ***,a series of rate-dependent constitutive equations are needed to describe its mechanical behaviors ***,it is still short of professional research on the material model for *** this study,the mate rial model was developed on the basis of JH-2 constitutive equations using the experimental *** model was then applied in simulating the impact process of Ti/Al3Ti metal-intermetallic laminate composites so as to validate the established *** agreement between simulation and experiment results shows the constitutive model predict the material responses under high rate and large deformation *** work provides more support for the theoretical and numerical research on the intermetallic.

关键词： Titanium aluminide JH-2 model Numerical simulation Quasi-static and dynamic compression tests Ballistic test

Luminescence: a new perspective for investigating perovskite precursors

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Science China Materials 2025年第1期 312-313页

作者： Haofeng Zheng Shaocong Hou School of electrical Engineering and Automation Wuhan University Wuhan University Shenzhen Research institute

In the past two decades, perovskite materials have made significant progress in optoelectronic semiconductors, emerging as formidable candidates for the next generation of commercial solar cells, light-emitting diodes (LEDs), and *** the fundamental solution chemistry and photophysics in solution-processed perovskite devices is crucial for comprehending to achieve highly efficient optoelectronic devices.

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Preparation and Easy-Cleaning Property of Rare Earth Composite Ceramic

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Journal of Rare Earths 2006年第Z2期24卷 248-250页

作者：王丽娟梁金生李计元梁广川 institute of Power source and Ecomaterials Science Hebei University of Technology

Rare earth and far-infrared mineral composite materials were added to ceramic glazes to prepare easy-cleaning ceramic . The morphology of easy-cleaning ceramic was observed by SEM. The influence of easy-cleaning ceramic on water surface tension and contact angles of water were investigated. Through calculation of ceramic surface free energy and observation of oil drop on ceramic surface in water, the easy-cleaning mechanism of rare earth composite ceramic was studied . It is found that the rare earth composite ceramic can make water surface tension decrease. The surface free energy and the polar component of rare earth composite ceramic are increased. The rare earth composite ceramics have the easy-cleaning property.

关键词： easy-cleaning far infrared surface tension surface free energy polar component rare earths

Enhanced Photoactivity of Layered Nanocomposite Materials Containing Rare Earths,Titanium Dioxide and Clay

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Journal of Rare Earths 2006年第Z2期24卷 251-254页

作者：欧秀芹孟军平王其民于俊梅 institute of Power source and Ecomaterials Science Hebei University of Technology

The nanocomposite materials containing rare earths, titanium dioxide and clay (RE/TiO2/Clay) were characterized and tested for the photocatalytic decomposition of formaldehyde. The results show that nanocomposite materials prepared by doping appropriate rare earth elements have better photocatalytic properties than that prepared by doping excessive rare earth elements. The photocatalytic mechanism of composite materials was studied by integrating the theory of pho-tocatalysis with experiment results. Because the site of photocatalytic reaction was limited in the interspace of clay, photocatalytic reaction occurred by two steps: firstly, organic molecules dispersed into the interlayers of clay; secondly, organic molecules and photocatalyst of RE/TiO2 occurred photocatalytic reaction, resulting in forming carbon dioxide.

关键词： titanium dioxide clay composite materials preparation photocatalytic reaction rare earths

Effect of tourmaline additive on the crystal growth and activity of LaCoO_3 for catalytic combustion of methane

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Journal of Rare Earths 2014年第9期32卷 855-859页

作者：王赛飞薛刚梁金生孟军平 institute of Power source and Ecomaterials Science Hebei University of Technology

LaCoO3/tourmaline was prepared as catalysts on the methane catalytic combustion. As additive tourmaline, its effect on crystal growth and catalytic activity of LaCoO3, were investigated via X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, H2-temperature programmed reduction （H2-TPR） and catalyst evaluation techniques. SEM and TEM indicated that the spontaneous polarizability of tourmaline made LaCoO3 particles grow dispersedly on tourmaline, allevi- ated the agglomeration and exposed more reactive sites. It was a main influence leading to the improvement of catalysts activity, exposed via catalyst evaluation device, Among the different additive proportion of compound samples, the 2% tourmaline added La- CoO3 showed an obvious enhancement activity compared to non-tourmaline sample--the light-off temperature was 454 ℃ and CH4 reached the full conversion at 563 ℃.

关键词： LaCoO3 tourmaline composite catalytic activity rare earths

Preparation and Characterization of Rare Earth Composite Materials Radiating Far Infrared for Activating Liquefied Petroleum Gas

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Journal of Rare Earths 2006年第Z2期24卷 277-280页

作者：朱东彬梁金生李奋平丁燕王丽娟梁广川许刚科 institute of Power source & Ecomaterials Science Hebei University of Technology

Rare earth composite materials radiating far-infrared rays were prepared according to far infrared absorption spectrum of main component in liquefied petroleum gas (LPG). The composite materials were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transformed infrared spectra(FTIR). The results show that after the composite materials were calcined at 873 K for 4 h, FTIR spectra of rare earth composite materials display two new peaks at 1336 and 2926 cm-1 available for activating LPG.

关键词： composite materials far-infrared electropolar mineral materials rare earths

Solution‑Processed Thin Film Transparent Photovoltaics:Present Challenges and Future Development

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Nano-Micro Letters 2025年第2期17卷 566-600页

作者： Tianle Liu Munerah M.S.Almutairi Jie Ma Aisling Stewart Zhaohui Xing Mengxia Liu Bo Hou Yuljae Cho UM-SJTU Joint institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China School of Physics and Astronomy Cardiff UniversityCardiff CF243AAWalesUK Department of electrical and Computer Engineering Yale UniversityNew HavenCT 06511USA Energy Sciences institute Yale UniversityWest HavenCT 06516USA Future Photovoltaics Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

electrical energy is essential for modern society to sustain economic *** soaring demand for the electrical energy,together with an awareness of the environmental impact of fossil fuels,has been driving a shift towards the utilization of solar ***,traditional solar energy solutions often require extensive spaces for a panel installation,limiting their practicality in a dense urban *** overcome the spatial constraint,researchers have developed transparent photovoltaics(TPV),enabling windows and facades in vehicles and buildings to generate electric *** TPV advancements are focused on improving both transparency and power output to rival commercially available silicon solar *** this review,we first briefly introduce wavelength-and non-wavelengthselective strategies to achieve *** of merit and theoretical limits of TPVs are discussed to comprehensively understand the status of current TPV *** we highlight recent progress in different types of TPVs,with a particular focus on solution-processed thin-film photovoltaics(PVs),including colloidal quantum dot PVs,metal halide perovskite PVs and organic *** applications of TPVs are also reviewed,with emphasis on agrivoltaics,smart windows and ***,current challenges and future opportunities in TPV research are pointed out.

关键词： Transparent semiconductors Solution-processable transparent solar cell Emerging solar cell materials Buildingintegrated photovoltaics

Effect of Rare Earth Composite Ceramic Materials on Oil Combustion of Oil-Burning Boiler

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Journal of Rare Earths 2006年第Z2期24卷 244-247页

作者：李奋平梁金生朱东彬丁燕王丽娟梁广川王亚楠 institute of Power source & Ecomaterials Science Hebei University of Technology

The rare earth composite ceramic materials were prepared using rare earths and far infrared natural mineral. The effects of the as-prepared ceramic materials on the oil consumption and air pollutants emissions of oil-burning boiler were investigated. The results show that the composite ceramic materials can radiate higher intensity of far infrared. The molecular movement is strengthened and the chemical bonds of the molecules are easily ruptured when the diesel oil is dealt with the composite materials. The oil-saving rate of the RBS·VH-1 .5 boiler dealt with the rare earth composite ceramic materials is 3.49%, and the reducing rates of CO and NO in the exhaust gas are 25.4% and 9.7%, respectively.

关键词： far infrared composite materials diesel oil combustion boiler oil consumption rare earths