Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Huan Liu,Zhen Ma
LaPO 4 has been used as a support to make supported catalysts in some investigations, but the effect of different LaPO 4 supports on the catalytic performance of supported catalysts has been rarely reported. In this work, conventional hexagonal LaPO 4 (LaPO 4 H) was prepared by precipitation, and hexagonal LaPO 4 nanowires (LaPO 4 HNW) was prepared by hydrothermal synthesis at 150 °C. Monoclinic LaPO 4 nanowires (LaPO 4 -MNW-220 and LaPO 4 -MNW-900) were prepared by hydrothermal synthesis at 220 °C or calcining LaPO 4 HNW at 900 °C. These samples were used to support Rh 2 O 3 via impregnation using Rh(NO 3 ) 3 as a precursor. The activities of these supported catalysts in N 2 O decomposition and CO oxidation follow the same sequence of Rh 2 O 3 / LaPO 4 HNW > Rh 2 O 3 / LaPO 4 H > Rh 2 O 3 / LaPO 4 -MNW-220 > Rh 2 O 3 / LaPO 4 -MNW-900, i.e. , two hexagonal LaPO 4 supports are better than two monoclinic LaPO 4 supports in making active catalysts, and hexagonal LaPO 4 nanowires are better than hexagonal LaPO 4 composed of nanoparticles and short nanorods. The most active catalyst has highly dispersed Rh 2 O 3 species interacting strongly with the support, more oxygen-adsorption capacity, and more basic sites.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Huan Liu,Yi Lin,Zhen Ma
Au/M-P-O (M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts were prepared by loading ca. 1 wt.% gold onto commercial metal phosphate supports by deposition-precipitation with urea (DPU), and tested in CO oxidation. Au/La-P-O showed the highest activity, achieving complete CO conversion at 70 °C. Au/Ca-P-O was the second most active, achieving complete CO conversion at 155 °C. The remaining catalysts were not active below 200 °C. In view of the results, we additionally prepared Au/LaPO 4 nanowires by loading ca. 1 wt.% gold onto LaPO 4 nanowires via DPU. The Au/LaPO 4 nanowires catalyst was even more active, achieving complete CO conversion at 15 °C. The catalysts were characterized by N 2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption of O 2 or CO 2 (O 2 -TPD, CO 2 -TPD). Reasons for the higher activity of Au/LaPO 4 nanowires were discussed.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
OPTICS LETTERS
·
2020
·Vol. 45
·期 10
·2752-2755
·
IF 3.714
Ke Li,Tingting Chen,Huibing Mao,Ye Chen,Jiqing Wang
The inverse opal ${\rm LaPO}_4 {:}{{\rm Eu}^{3 + }}$ was successfully fabricated by the sol-gel method, and characterized by the scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), and photoluminescence investigations. The inverse opal ${\rm LaPO}_4 {:}{{\rm Eu}^{3 + }}$ sample has a different emission in comparison with the ordinary luminescence emission bands of ${{\rm Eu}^{3 + }}$ ion at 590, 615, and 695 nm. In the inverse opal structure, the strongest emission is the transition ${^5{{\rm D}_0}{ \to {^7}{\rm F}_4} }$ at about 695 nm, which may be due to the fact that the emission in the plane decreases because of the photonic band structure and the corresponding emission in the vertical direction increases. For the emissions at 590 and 615 nm of the ${{\rm Eu}^{3 + }}$, the results show that the emission ratio of 590 to 615 nm increases from 0.266 to 0.639 for the inverse opal sample in comparison with the ordinary sample, which means that the ratio increases about 2.4 times for the inverse opal sample. An appropriate reason is that in the inverse opal sample the magnetic dipole emission ${^5{{\rm D}_0}{ \to }{^7{\rm F}_1} }$ will increase in comparison with the electric dipole emission ${^5{{\rm D}_0}{ \to }{^7{\rm F}_2} }$.
研究领域:
材料科学
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光学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Mengli Li,Lingxia Zhang,Xiangqian Fan,Meiying Wu,Min Wang,Ruolin Cheng,Linlin Zhang,Heliang Yao,Jianlin Shi
We have synthesized a series of LaPO 4 /g-C 3 N 4 core-shell nanowires via an in-situ hydrothermal growth of LaPO 4 nanorods in tubular g-C 3 N 4 and investigated their photocatalytic activity in CO 2 reduction. It was found that in the synthesized core-shell structure, the outer g-C 3 N 4 nano-shells coated on the LaPO 4 nanorod cores resulted in the enhanced light absorption and charge carrier separation/transfer ability, thus improved the room temperature photocatalytic performance of the nanocomposites in CO 2 photocatalytic reduction compared with the g-C 3 N 4 and LaPO 4 individuals. A maximum CO yield of 0.433 μmol has been obtained from CO 2 reduction within 1 h irradiation on 30 mg nanocomposite photocatalyst under the absence of any noble metal. Finally, a possible mechanism, which is featured with LaPO 4 activation due to significantly promoted separation/transfer of photo-generated charge carriers, was proposed. The encouraging performance in CO 2 photoreduction demonstrates that this novel nanocomposite will be a prospective material in environmental protection and energy conversion.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Zhu Xiaowei,Yang Kuisuo,Wu Anping,Bai He,Bao Jinrong,Qiao Yan,Yang Yunjiang,Li Wenxian,Liu Ying
The novel submicro-spheres SiO 2 @LaPO 4 :Eu@SiO 2 with core-shell-shell structures were prepared by connecting the SiO 2 submicro-spheres and the rare earth ions through an organosilane HOOCC 6 H 4 N(CONH(CH 2 ) 3 Si(OCH 2 CH 3 ) 3 (MABA-Si). The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). It is found that the intermediate shell of the submicro-spheres was composed by LaPO 4 :Eu nanoparticles with the size of about 4, 5–7, or 15–34 nm. A possible formation mechanism for the SiO 2 @LaPO 4 :Eu@SiO 2 submicro-spheres has been proposed. The dependence of the photoluminescence intensity on the size of the LaPO 4 :Eu nanoparticles has been investigated. The intensity ratios of electrical dipole transition 5 D 0 → 7 F 2 to magnetic dipole transition 5 D 0 → 7 F 1 of Eu 3+ ions were increased with decreasing the size of LaPO 4 :Eu nanoparticles. According to the Judd-Ofelt (J-O) theory, when the size of LaPO 4 :Eu nanoparticles was about 4, 5–7 and 15–34 nm, the calculated J-O parameter Ω 2 (optical transition intensity parameter) was 2.30 × 10 −20 , 1.80 × 10 −20 and 1.20 × 10 −20 , respectively. The increase of Ω 2 indicates that the symmetry of Eu 3+ in the LaPO 4 lattice was gradually reduced. The photoluminescence intensity of the SiO 2 @LaPO 4 :Eu@SiO 2 submicro-spheres was unquenched in aqueous solution even after 15 days.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zhan Ni,Mengxin Liu,Bo Li,Xinan Shi,Qiulin Cao,Daocheng Pan
LaPO4:Ce3+, Tb3+ nanoparticles with a particle size of 2.7 nm are prepared by a facile room-temperature ligand-assisted coprecipitation method in an aqueous solution. Short-chain butyric acid and butylamine are used as binary ligands and play a critically important role in the synthesis of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. The absolute photoluminescence quantum yield as high as 74% can be achieved for extremely small LaPO4:Ce3+, Tb3+ nanoparticles with an optimal composition of La0.4PO4:Ce0.13+, Tb0.53+, which is different from La0.4PO4:Ce0.453+, Tb0.153+ for bulk phosphor. The energy transfer from Ce3+ ions to Tb3+ ions is investigated in sub-3 nm LaPO4:Ce3+, Tb3+ nanoparticles, and Ce3+ ion emission is almost completely suppressed. This room-temperature, ultrafast, and aqueous-phase synthetic strategy is particularly suitable for the large-scale preparation of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. LaPO4:Ce3+, Tb3+ nanoparticles (110 g) can be synthesized in one batch, which is perfectly suited to the needs of industrial production.
研究领域:
材料科学
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纳米技术
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光学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Ruilin Feng,Yanlong Qi,Shijun Liu,Long Cui,Quanquan Dai,Chenxi Bai
1,3-Pentadiene plays an extremely important role in the production of polymers and fine chemicals. Herein, the LaPO 4 catalyst exhibits excellent catalytic performance for the dehydration production of 1,3-pentadiene with 2,3-pentanediol, a C5 diol platform compound that can be easily obtained by hydrogenation of bio-based 2,3-pentanedione. The relationships of catalyst structure-acid/base properties-catalytic performance was established, and an acid-base synergy effect was disclosed for the on-purpose synthesis of 1,3-pentadiene. Thus, a balance between acid and base sites was required, and an optimized LaPO 4 with acid/base ratio of 2.63 afforded a yield of 1,3-pentadiene as high as 61.5% at atmospheric pressure. Notably, the Brønsted acid sites with weak or medium in LaPO 4 catalyst can inhibit the occurrence of pinacol rearrangement, resulting in higher 1,3-pentadiene production. In addition, the investigation on reaction pathways demonstrated that the E2 mechanism was dominant in this dehydration reaction, accompanied by the assistance of E1 and E1cb.
研究领域:
化学工程
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催化
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可再生化学
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有机合成
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产品关联
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 9
·1093
·
IF 2.8
Wei Wang,Qiwen Zhang,Fan Zhang,Hongyue Li,Ying Liu,Kemeng Wei,Yan Zhao,Songlin Yu,Yajun Li,Feng Zhang,Meili Yang,Qing-Qing Hao,Xiaolin Luo
The gas-phase synthesis of anisole from methanol and phenol is currently recognized as the process with the most theoretical research value and industrial application prospect. LaPO4has attracted widespread attention due to its excellent catalytic activity, robust water resistance, and high-temperature performance. In this work, rod-like monoclinic, mixed phase, and hexagonal LaPO4were synthesized using the hydrothermal method, and their catalytic activity was evaluated. The results showed that the catalytic activity of the hexagonal phase is higher than that of the monoclinic phase. By combining relevant characterization methods and DFT theoretical calculations, it is clarified that the higher acidity and stronger alkalinity of the exposed surface of hexagonal LaPO4are the main reasons for its higher activity. Further research has revealed that the main cause of LaPO4deactivation is carbon deposition on the catalyst surface.
研究领域:
催化化学
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材料科学
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物理化学
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工业催化
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表面科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Wenting Fan,Fang Zhao,Jiahong Dou,Xuhong Guo
The efficient and scalable synthesis of lanthanide-doped NPs, which exhibit down- and upconversion luminescent properties simultaneously, is still a main challenge that are hindering their adoption. Herein, we employed a facile method, i.e. reactive flash nanoprecipitation, to fabricate dual-mode luminescent lanthanide phosphate (LnPO 4 ) NPs: lanthanum phosphate (LaPO 4 ) co-doped with Tb 3+ and Yb 3+ . The lanthanide source streams and phosphate ion source streams were efficiently mixed in a multi-inlet vortex mixer reactor, and the use of a stabilizer was found to facilitate the formation of uniformly-dispersed LnPO 4 nanocrystals. It is demonstrated that the annealed LnPO 4 NPs exhibited intense down- and upconversion emission under UV and NIR irradiation, respectively. Notably, through adjusting the LnPO 4 to stabilizer mass ratio, the NP diameter could be tuned in a range between 50 and 200 nm, and the composition of LaPO 4 :Tb 3+ ,Yb 3+ NPs could be easily tuned by adjusting the flow rate ratio of the feed streams.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2020
·
IF 4.794
Xuan Jing,Li Chen,Yaxin Wang,Yunyun Wang,Xinyan Yang,Jiangdong Dai,Xiaohui Dai,Yinhua Jiang,Yan Liu,Zhanchao Liu,Yongsheng Yan
Efficient incorporation of large-mesoporous silica materials with the film structure to fabricate hybrid film materials has been promising for water treatment. The modified large-mesoporous silica films possessed superior adsorbability, but the poor mechanical behavior hampered the application of adsorbents. We proposed the fabrication of La modified rGO/silica mesoporous films for efficient phosphate removal to deal with this problem. Consider the problem of plugging of mesopores , La/Si molar ratio of 1/10 was a conventionally reported loading ratio in the literatures. In this paper, the film materials also retained pore size (19.97 nm) comparable with that of the pristine large-mesoporous silica films (20.53 nm) when the La/Si molar ratio was 1/5. In the adsorption experiments, the maximum phosphate capacities achieved 55.045 mg g −1 . And multi-adsorption mechanisms were confirmed by the results of analysis. The formation of rod-like crystal LaPO 4 was the main pathway in the adsorption process. The film material might create a new way for phosphate removal.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 14
·3424
·
IF 4.183
Jianguo Li,Hongying Dong,Fan Yang,Liangcheng Sun,Zhigang Zhao,Ruixi Bai,Hao Zhang
In this work, LaPO4:Ce, Tb phosphors were prepared by firing a LaPO4:Ce, Tb precipitate using an ionic-liquid-driven supported liquid membrane system. The entire system consisted of three parts: a mixed rare earth ion supply phase, a phosphate supply phase, and an ionic-liquid-driven supporting liquid membrane phase. This method showed the advantages of a high flux, high efficiency, and more controllable reaction process. The release rate of PO43−from the liquid film under different types of ionic liquid, the ratio of the rare earth ions in the precursor mixture, and the structure, morphology, and photoluminescence properties of LaPO4:Ce, Tb were investigated by inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction, Raman spectra, scanning electron microscopy, and photoluminescence emission spectra methods. The results showed that a pure phase of lanthanum orthophosphate with a monoclinic structure can be formed. Due to differences in the anions in the rare earth supply phase, the prepared phosphors showed micro-spherical (when using rare earth sulfate as the raw material) and nanoscale stone-shape (when using rare earth nitrate as the raw material) morphologies. Moreover, the phosphors prepared by this method had good luminescent properties, reaching a maximum emission intensity under 277 nm excitation with a predominant green emission at 543 nm which corresponded to the5D4-7F5transition of Tb3+.
研究领域:
材料科学
·
无机化学
·
发光材料
·
膜技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaojian Pan,Xinyu Gao,Jiaru He,Jing Zhao,Keheng Pan,Yongjun Cao,Lihong Bao
Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is essential for sustainable energy conversion. In this work, a ternary Pt/LaPO 4 /MoB 2 heterostructure has been synthesized using a combined sol-gel, solid-state reaction and impregnation method. The optimal 1.5 wt% Pt/LaPO 4 /MoB 2 catalyst exhibits remarkable HER activity with an low overpotential of 84 mV at 10 mA cm −2 , and surpasses the commercial Pt/C at high current density (>100 mA cm −2 ). This enhanced HER performance is originated from a unique synergistic effect where metallic MoB 2 facilitates rapid electron transfer while LaPO 4 acts as a proton reservoir by forming [HPO 4 ] 2- structures to increase local H + concentration. This robust interfacial coupling effectively optimizes the electronic structure and accelerates charge-carrier transfer kinetics via the triple-phase boundaries, offering a promising strategy for large scale and high efficiency hydrogen production.
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高影响因子
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