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学者姓名：黄清明
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Abstract ：
Au and Zr are uniformly loaded on the surface of TS-1 by coprecipitation method to obtain atomically dispersed Au-Zr binary clusters. The interaction between Au clusters, Zr and TS-1 is analyzed by Independent Gradient Model based on Hirshfeld partition (IGMH), adsorption energy of Au cluster, Mayer bond order. It is found that the existence of Zr is conducive to the stability of nano Au on TS-1 surface. The catalyst is applied to the gas phase epoxidation of C3H6 to obtain 14.06 % initial conversion, 93.93 % initial selectivity and 479.52 gPO center dot kg(cat)(-1)center dot h(-1) initial productivity. It shows good stability in the continuous test for more than 50 h. Density functional theory (DFT) is used to calculate the possible catalytic reaction mechanism on the surface of atomically dispersed Au clusters. The whole process from C3H6 epoxidation reaction to catalyst regeneration is completely described. In the analysis of H2O desorption, the concept of "relay desorption" is proposed. Combined with charge and surface electrostatic potential analysis, the different attack directions of C3H6 on the catalyst surface are dis-cussed in detail. This will provide guidance and help for the synthesis and catalytic application of nano Au catalysts.
Keyword ：
Coprecipitation method Coprecipitation method DFT DFT Interaction of Au Zr and TS-1 Interaction of Au Zr and TS-1 Propylene epoxidation Propylene epoxidation Sub-nano Au-Zr clusters Sub-nano Au-Zr clusters
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| GB/T 7714 | Peng, Jiahui , Li, Bin , Chen, Wenkai et al. Atomically dispersed nano Au clusters stabilized by Zr on the TS-1 surface: Significant enhancement of catalytic oxidation ability using H-2 and O-2 [J]. | APPLIED SURFACE SCIENCE , 2023 , 619 . |
| MLA | Peng, Jiahui et al. "Atomically dispersed nano Au clusters stabilized by Zr on the TS-1 surface: Significant enhancement of catalytic oxidation ability using H-2 and O-2" . | APPLIED SURFACE SCIENCE 619 (2023) . |
| APA | Peng, Jiahui , Li, Bin , Chen, Wenkai , Hu, Hui , Huang, Qingming , Chen, Xiaohui . Atomically dispersed nano Au clusters stabilized by Zr on the TS-1 surface: Significant enhancement of catalytic oxidation ability using H-2 and O-2 . | APPLIED SURFACE SCIENCE , 2023 , 619 . |
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CuZnZrAl catalysts were synthesized by the co-precipitation and coprecipitation-ammonia methods and modified with Y and Ce promoters for the methanol steam reforming hydrogen production process. The physicochemical properties of the catalysts were analyzed by XRD, BET, H2-TPR, and XPS methods. The methanol conversion, as well as CO selectivity of MSR at different temperatures, were investigated, and its stability was probed using repeated start and stop test to simulate the onboard hydrogen production process. The results showed that the methanol conversion of CuZnZrAl catalyst prepared by coprecipitation-ammonia method was 96.9% at a tem-perature of 270 degrees C, S/C molar ratio of 1.2, and WHSV of 2.6 h-1, which was higher than that of 94.6% by the co-precipitation method. In addition, the best catalytic performance was obtained for the catalyst with Ce promoter addition using coprecipitation-ammonia method. The conversion was 100% at 270 degrees C with a CO selectivity of only 0.31%, and the conversion remained 98.7% after 20 reactions were repeated.
Keyword ：
Coprecipitation-ammonia method Coprecipitation-ammonia method CuZnZrAl catalysts CuZnZrAl catalysts Hydrogen Hydrogen Methanol steam reforming Methanol steam reforming
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| GB/T 7714 | Li, Linfeng , Chen, Jiayuan , Zeng, Cuibing et al. Preparation of CuZnZrAl catalysts by coprecipitation-ammonia method for methanol steam reforming and the effect of promoters Y and Ce [J]. | MOLECULAR CATALYSIS , 2023 , 537 . |
| MLA | Li, Linfeng et al. "Preparation of CuZnZrAl catalysts by coprecipitation-ammonia method for methanol steam reforming and the effect of promoters Y and Ce" . | MOLECULAR CATALYSIS 537 (2023) . |
| APA | Li, Linfeng , Chen, Jiayuan , Zeng, Cuibing , Liu, Quan , Hu, Hui , Huang, Qingming et al. Preparation of CuZnZrAl catalysts by coprecipitation-ammonia method for methanol steam reforming and the effect of promoters Y and Ce . | MOLECULAR CATALYSIS , 2023 , 537 . |
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The epoxidation of propylene (C3H6) over TS-1 molecular sieve supported with nano-Au clusters by deposition-precipitation (DP) method has always been the focus of the catalytic field. A quantity of atomically dispersed Au clusters can be synthesized induced by NH3 as an assistant in the DP system. These smaller Au clusters show 14.3% C3H6 conversion, 91.7% propylene oxide (PO) selectivity, 10.6% H-2 efficiency and 477.4 gPO center dot kg(cat)(-1)center dot h(-1) PO productivity in the epoxidation reaction of C3H6. The interaction between NH3 and [AuCl4](-) in aqueous solution is analyzed by means of experiments and Density Functional Theory (DFT), and it is concluded that at least 2 times of NH3 is needed to make Au precipitate completely. Similarly, the mechanism of C3H6 epoxidation catalyzed by Aun (n = 2, 3, 4) clusters in coordination with Ti sites is calculated with the help of DFT. It is believed that the in-situ formation of Ti-OOH structure at Ti sites through H-2 and O-2 is the key to initiate C3H6 epoxidation. The general rules of catalytic mechanism under different size of Au clusters are also analyzed.
Keyword ：
Atomically dispersed Au clusters Atomically dispersed Au clusters Deposition-precipitation method Deposition-precipitation method DFT DFT NH3 induction NH3 induction Propylene epoxidation Propylene epoxidation
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| GB/T 7714 | Peng, Jiahui , Liu, Kexing , Guo, Shujuan et al. Synthesis strategy of atomically dispersed Au clusters induced by NH3 on TS-1: Significantly improve the epoxidation activity of propylene [J]. | CHEMICAL ENGINEERING JOURNAL , 2023 , 472 . |
| MLA | Peng, Jiahui et al. "Synthesis strategy of atomically dispersed Au clusters induced by NH3 on TS-1: Significantly improve the epoxidation activity of propylene" . | CHEMICAL ENGINEERING JOURNAL 472 (2023) . |
| APA | Peng, Jiahui , Liu, Kexing , Guo, Shujuan , Chen, Wenkai , Hu, Hui , Huang, Qingming et al. Synthesis strategy of atomically dispersed Au clusters induced by NH3 on TS-1: Significantly improve the epoxidation activity of propylene . | CHEMICAL ENGINEERING JOURNAL , 2023 , 472 . |
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La2Mg1-x/2Zr1-x/2O6:xBi3+ (x = 0.01-0.035, abbreviated as LMZ:Bi3+) and La2-yMg0.99Zr0.99O6: 0.02Bi3+,yEu3+ (y = 0.1-0.11, abbreviated as LMZ:Bi3+,Eu3+) double-perovskite phosphors were prepared through high-temperature solid-phase method. The emission spectrum of LMZ:xBi3+ (x = 0.01-0.035) phosphors excited at 353 nm is asymmetric in the range between 375 and 650 nm, showing strong green light. There are two luminescent centers of [Mg1/Zr2-O6] and [Mg2/Zr1-O6] for Bi3+ occupation, which were analyzed through different excitation wavelengths, Gaussian fitting peaks, fluorescence decay curves and Rietveld refinement of powder X-ray diffraction data. Through deep study of the luminescent lattices in the LMZ matrix, the green to blue tunning-emission is observed by different excitation wavelengths. In addition, red emission is obtained by co-doping Bi3+/Eu3+, and adjustable emission was investigated by changing the content of Eu3+ in the co-doped phosphor formulation, so it is converted from green emission to red emission. The above results demonstrate how to tune emission color by co-doping rare earth ions in the double perovskite phosphor, which is attractive for future applications.(c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
Keyword ：
Double perovskite Double perovskite Energy transfer Energy transfer Phosphor Phosphor Rare earths Rare earths Tunable emission Tunable emission
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| GB/T 7714 | Yang, Chen , Fan, Chenli , Hussain, Fayaz et al. Luminescent ionic lattice occupation and wide tunable emission spectra of La2MgZrO6:Bi3+,Eu3+double perovskite phosphors for white light LED [J]. | JOURNAL OF RARE EARTHS , 2023 , 41 (4) : 489-497 . |
| MLA | Yang, Chen et al. "Luminescent ionic lattice occupation and wide tunable emission spectra of La2MgZrO6:Bi3+,Eu3+double perovskite phosphors for white light LED" . | JOURNAL OF RARE EARTHS 41 . 4 (2023) : 489-497 . |
| APA | Yang, Chen , Fan, Chenli , Hussain, Fayaz , Sheng, Weiqing , Song, Kaixin , Wu, Jun et al. Luminescent ionic lattice occupation and wide tunable emission spectra of La2MgZrO6:Bi3+,Eu3+double perovskite phosphors for white light LED . | JOURNAL OF RARE EARTHS , 2023 , 41 (4) , 489-497 . |
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The pure silicon MWW were synthesized for the first time by means of a dry-gel conversion method utilizing N, N, N-trimethyl-1-adamantyl ammonium hydroxide and hexamethyleneimine as the structural directing agents. A vapor transport assisted crystallization method for obtaining complete crystallinity was developed to replace the traditional dry-gel conversion methods. TiCl4 acid solution treatment was cleverly used for the implantation of titanium in MWW. Compared with Ti-ERB-1, the Ti content of boron-free Ti-MWW is only 20% of the former, the conversion rate of 1-hexene epoxidation is 2.3 times of the former and nearly 100% of H2O2 efficiency.
Keyword ：
1-Hexene epoxidation 1-Hexene epoxidation Atom-planting Atom-planting Boron-free Ti-MWW Boron-free Ti-MWW TOF TOF
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| GB/T 7714 | Ge, Zhijin , Li, Xin'ao , Hu, Hui et al. Synthesis of boron- free titanosilicate zeolite by TiCl4/HCl treatment of pure silicon MWW as an epoxidation catalyst [J]. | JOURNAL OF CATALYSIS , 2023 , 428 . |
| MLA | Ge, Zhijin et al. "Synthesis of boron- free titanosilicate zeolite by TiCl4/HCl treatment of pure silicon MWW as an epoxidation catalyst" . | JOURNAL OF CATALYSIS 428 (2023) . |
| APA | Ge, Zhijin , Li, Xin'ao , Hu, Hui , Huang, Qingming , Chen, Xiaohui . Synthesis of boron- free titanosilicate zeolite by TiCl4/HCl treatment of pure silicon MWW as an epoxidation catalyst . | JOURNAL OF CATALYSIS , 2023 , 428 . |
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本发明公开了一种高荧光强度的上转换稀土掺杂纳米材料及其制备方法，其通过高温共沉淀法合成粒径约为21nm掺杂Hf4+的LiYF4 : Er3+/Yb3+@LiYF4上转换纳米颗粒，Hf4+掺杂浓度分布在0~4%。通过XRD，TEM等研究了Hf4+离子掺杂对LiYF4 : Er3+/Yb3+@LiYF4的物相和形貌。掺杂Hf4+离子能产生晶格畸变，从而改变Er3+周围环境的晶体场，破环Er3+的禁戒跃迁，从而增强上转换发光，掺杂Hf4+能提高红光和绿光上转换发光强度约1.47倍。
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| GB/T 7714 | 俞瀚 , 林明明 , 李江 et al. 一种高荧光强度的上转换稀土掺杂纳米材料及其制备方法 : CN202210060357.3[P]. | 2022-01-19 00:00:00 . |
| MLA | 俞瀚 et al. "一种高荧光强度的上转换稀土掺杂纳米材料及其制备方法" : CN202210060357.3. | 2022-01-19 00:00:00 . |
| APA | 俞瀚 , 林明明 , 李江 , 张新奇 , 黄清明 . 一种高荧光强度的上转换稀土掺杂纳米材料及其制备方法 : CN202210060357.3. | 2022-01-19 00:00:00 . |
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As a successor to the light-emitting-diode (LED), the laser diode (LD) forecasts a brighter future for energy-saving solid-state lighting (SSL). Aiming for high-performance white LD, herein, a brand-new material form for Y3Al5O12:Ce3+ (YAG:Ce) garnet, that is, the integrated composite of YAG:Ce phosphor-in-silica glass ceramic/phosphor-in-silica ceramic (PiSGC/PiSC) film-on-sapphire plate (SP), following an "amorphous -> polycrystalline" phase transformation mechanism, is developed. Remarkably, nearly full crystallization from glass in a controllable manner can be achieved. The in situ precipitated SiO2 microcrystals with high thermal conductivity (TC) favor to build efficient local heat dissipation network inside this opto-functional composite, and therefore, substantially increase luminescence saturation threshold and luminous brightness under blue LD irradiation. Upon material optimization, bright and directional white light is generated with luminous flux (LF) of 1350 lm@10.5 W mm(-2), correlated color temperature (CCT) of 7916 K, and color rendering index (CRI) of 69.3, enabling the application in high-brightness long-distance illumination scenarios. This smart material design highlights the combined merits of admirable luminescent properties from YAG:Ce@SiO2 ceramic, ultrahigh TC from sapphire single crystal, as well as, low cost, facile preparation, scalable manufacturing inherited from glass.
Keyword ：
glass ceramics glass ceramics laser lightings laser lightings phosphor-in-glass phosphor-in-glass solid-state-lightings solid-state-lightings YAG YAG
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| GB/T 7714 | Lin, Shisheng , Lin, Hang , Huang, Qingming et al. Highly Crystalline Y3Al5O12:Ce3+ Phosphor-in-Glass Film: A New Composite Color Converter for Next-Generation High-Brightness Laser-Driven Lightings [J]. | LASER & PHOTONICS REVIEWS , 2022 , 16 (12) . |
| MLA | Lin, Shisheng et al. "Highly Crystalline Y3Al5O12:Ce3+ Phosphor-in-Glass Film: A New Composite Color Converter for Next-Generation High-Brightness Laser-Driven Lightings" . | LASER & PHOTONICS REVIEWS 16 . 12 (2022) . |
| APA | Lin, Shisheng , Lin, Hang , Huang, Qingming , Yang, Hongyi , Wang, Bo , Wang, Pengfei et al. Highly Crystalline Y3Al5O12:Ce3+ Phosphor-in-Glass Film: A New Composite Color Converter for Next-Generation High-Brightness Laser-Driven Lightings . | LASER & PHOTONICS REVIEWS , 2022 , 16 (12) . |
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Nanotetragonal LiYF4:RE (Tm,Er,Ho) is a kind of excellent upconversion luminescence (UCL) material potentially used in many fields, while the enhancement of UC emission and regulation of luminescence lifetime are still a challenge. Herein, a strategy was reported to enhance UCL performance with the aid of the construction of a 3Yb-Er-Hf sublattice energy cluster with the introduction of H1 and the interception of surface defect fluorescence quenching. UCL was obviously decreased by Hf4+ doping without surface defect elimination, but after the interception of surface defect quenching, UCL was dramatically enhanced more than 300-fold with an Er3+/Hf4+ mole ratio of 1:1. The contribution of UCL enhancement by the construction of a 3Yb-Er-Hf sublattice energy cluster is about 1.5 times of the sample without energy cluster construction. Interestingly, the lifetime of UCL can also be regulated by this strategy. According to the results of systematical microstructure analyses and UCL performance behaviors examined by X-ray powder diffraction (XRD), small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), and fluorescence spectrophotometry (FS) methods, the possible mechanism of UCL enhancement was proposed. This work may be an inspiration for researchers to design and develop high-performance UCL nanomaterials.
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| GB/T 7714 | Yu, Han , Lin, Mingming , Lin, Hang et al. Enhancement of Upconversion Luminescence by the Construction of a 3Yb-Er-Hf Sublattice Energy Cluster and Surface Defect Elimination [J]. | INORGANIC CHEMISTRY , 2022 , 61 (13) : 5405-5412 . |
| MLA | Yu, Han et al. "Enhancement of Upconversion Luminescence by the Construction of a 3Yb-Er-Hf Sublattice Energy Cluster and Surface Defect Elimination" . | INORGANIC CHEMISTRY 61 . 13 (2022) : 5405-5412 . |
| APA | Yu, Han , Lin, Mingming , Lin, Hang , Liu, Changwei , Zhang, Xinqi , Huang, Qingming . Enhancement of Upconversion Luminescence by the Construction of a 3Yb-Er-Hf Sublattice Energy Cluster and Surface Defect Elimination . | INORGANIC CHEMISTRY , 2022 , 61 (13) , 5405-5412 . |
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Density Functional Theory is used to calculate the epoxidation of propylene on the dimer MoOx by Gaussian 09 software. We calculate the dehydrogenation process of propylene and the formation process of propylene oxide. It is found that the activity of O in Mo-O-Si, which is beneficial to the dehydrogenation process of propylene, is high. Furthermore, we establish a dimer MoOx model with defect sites, and find that the defect sites in the dimer MoOx can activate O-2 (O-2(2-)) effectively. Consequently, the catalyst containing defect sites is conducive to the selectivity of propylene oxide.
Keyword ：
Defect Defect DFT DFT Dimer MoOx Dimer MoOx Propylene epoxidation Propylene epoxidation
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| GB/T 7714 | Peng, Jiahui , Wan, Zhehong , Chen, Wei et al. Theoretical comparative study on the mechanism of gas phase epoxidation of propylene about complete and defective dimer MoOx [J]. | COMPUTATIONAL AND THEORETICAL CHEMISTRY , 2022 , 1210 . |
| MLA | Peng, Jiahui et al. "Theoretical comparative study on the mechanism of gas phase epoxidation of propylene about complete and defective dimer MoOx" . | COMPUTATIONAL AND THEORETICAL CHEMISTRY 1210 (2022) . |
| APA | Peng, Jiahui , Wan, Zhehong , Chen, Wei , Hu, Hui , Huang, Qingming , Chen, Xiaohui . Theoretical comparative study on the mechanism of gas phase epoxidation of propylene about complete and defective dimer MoOx . | COMPUTATIONAL AND THEORETICAL CHEMISTRY , 2022 , 1210 . |
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The blue-green emitting La2MgZr1-xSnxO6: 0.02Bi3+ (x = 0-1, abbreviated as LMZ: Bi3+, xSn4+) phosphors with a double-perovskite structure were prepared through a conventional high-temperature solid-state method. A complex ionic substitution phenomenon of selective occupation of Bi3+ in the host of LMZ was observed with Sn4+ doping which was explained on the basis of Rietveld refinement, density functional theory (DFT) calculation and UV-vis spectroscopy results. Fluorescence spectrum analysis showed that LMZ: 0.02Bi3+ emitted a broad green light band with a range of 375-650 nm. With the increase of the Sn4+ concentration replacing Zr4+, the intensity of green light was firstly enhanced and then gradually decreases until disappeared. The emission peak of blue light appears near 400 nm and then its intensity gradually increased. Through Gaussian deconvolution and fluorescence decay curve, it was found that there were two luminescence centers in LMZ: 0.02Bi3+, and three luminescence centers in LMZ: 0.02Bi3+,0.6Sn4+, respectively, which were determined by the Van Uitert empirical formula combined with the energy level splitting theory. The above results demonstrate that how to tune emission color by the substitution of B-site in double perovskite phosphors, which is attractive for future applications. (c) 2022 Elsevier B.V. All rights reserved.
Keyword ：
Energy transfer Energy transfer Luminous center Luminous center Perovskite Perovskite Phosphor Phosphor
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| GB/T 7714 | Yang, Chen , Fan, Chenli , Hussain, Fayaz et al. Sn4+ induced Bi3+ multi-lattice selective occupation and its color-tunable emission of La2MgZrO6: Bi3+, Sn4+ double perovskite phosphors [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 902 . |
| MLA | Yang, Chen et al. "Sn4+ induced Bi3+ multi-lattice selective occupation and its color-tunable emission of La2MgZrO6: Bi3+, Sn4+ double perovskite phosphors" . | JOURNAL OF ALLOYS AND COMPOUNDS 902 (2022) . |
| APA | Yang, Chen , Fan, Chenli , Hussain, Fayaz , Ye, Zijun , Sheng, Weiqing , Song, Kaixin et al. Sn4+ induced Bi3+ multi-lattice selective occupation and its color-tunable emission of La2MgZrO6: Bi3+, Sn4+ double perovskite phosphors . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 902 . |
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