FUEL
·
2024
·
IF 6.7
Shafqat Ullah,Yongqi Pan,Qiangqiang Xue,Tianyi Huang,Yizhi Hu,Runping Ye,Yujun Wang,Guangsheng Luo
CO 2 methanation has emerged as a key strategy for its potential uses and ability to alleviate climate change by reducing CO 2 emissions. Herein, we present a controllable and continuous improved coprecipitation catalyst preparation method employing a T-junction microreactor to investigate La doped Ni-CeO 2 catalysts. A series of catalysts was systematically synthesized, with Ni/CeLa (5:5) emerging as the most promising candidate, exhibiting 76 % CO 2 conversion at 250 °C and 60.5 mmol/g cat .h space–time yield of methane. Different structural characterization techniques, including in-situ Raman, Quasi in-situ XPS, in-situ DRIFTS, and DFT calculations were employed to unravel the structure activity mechanisms contributing to the enhanced catalytic performance. The findings indicate that the introduction of La as a dopant reduces particle size, promotes Ni dispersion, and increases interfacial sites. These enriched interfacial sites contribute a pivotal role in facilitating the adsorption and hydrogenation of bicarbonate species, ultimately leading to improved methanation performance. This study not only highlights the efficiency of the La doped Ni-CeO 2 catalyst, but it also gives valuable insights for chemical strategy to improve structure activity relationships and mechanism studies for efficient CO 2 methanation performance.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 24
·13502
·
IF 5.924
Yue Zhang,Zhen Zeng,Yubing Yong,Yingmin Lyu
In lily reproduction, the mechanism of formation of bulbs has been a hot topic. However, studies on stem bulblet formation are limited. Stem bulblets, formed in the leaf axils of under- and above-ground stems, provide lilies with a strong capacity for self-propagation. First, we showed that above-ground stem bulblets can be induced by spraying 100 mg/L 6-BA on the LA hybrid lily ‘Aladdin’, with reduced endogenous IAA and GA4and a higher relative content of cytokinins. Then, expression patterns of three potential genes (twoKNOTTED1-like homeobox (KNOX) and one partialBEL1-like homeobox (BELL)), during stem bulblet formation from our previous study, were determined by RT-qPCR, presenting a down-up trend inKNOXs and a rising tendency inBELL. The partialBELLgene was cloned by RACE fromL. ‘Aladdin’ and denotedLaBEL1. Physical interactions of LaKNOX1-LaBEL1 and LaKNOX1-LaKNOX2 were confirmed by yeast two-hybrid and bimolecular fluorescence complementation assays. Furthermore, hormonal regulatory patterns of single LaKNOX1, LaKNOX2, LaBEL1, and their heterodimers, were revealed in transgenicArabidopsis, suggesting that the massive mRNA accumulations ofLaKNOX1,LaKNOX2andLaBEL1genes during stem bulblet formation could cause the dramatic relative increase of cytokinins and the decline of GAs and IAA. Taken together, a putative model was proposed that LaKNOX1 interacts with LaKNOX2 and LaBEL1 to regulate multiple phytohormones simultaneously for an appropriate hormonal homeostasis, which suggests their potential role in stem bulblet formation inL. ‘Aladdin’.Keywords:KNOX transcription factor;BELL transcription factor;interaction;phytohormone;bulblet formation;LA hybrid lily
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ENERGY & FUELS
·
2023
·
IF 5.3
Mengliang Gao,Jie Gao,Ge Pu,Cong Yuan,Xingqiang Lu
The redox activity and thermal stability of oxygen carriers (OCs) during multi-cycle processes are important performance criteria. In this paper, the effects of three supports, i.e., ZrO2, TiO2, and YSZ (yttria-stabilized zirconia), on the reactivity, redox stability, hydrogen recovery capacity, and purity, as well as the sintering behavior of La-modified CoFe2O4 (LCF) OCs, were investigated. The results indicated that the unsupported LCF had severe sintering behavior, the aggregation of grains, the collapse of pore structure, and surface densification after multiple cycles led to a significant reduction in its activity. Meanwhile, the interaction between different supports and active components had a remarkable influence on fuel conversion and hydrogen recovery capacity. The formation of Fe2TiO5 in LCF6T4 weakened the initial reduction activity of the OC. Also, phase separation occurred after multiple cycles, forming separated Fe2O3 and TiO2, which further accelerated the sintering and resulted in irreversible deactivation. In contrast, LCF6Z4 and LCF6YZ4 exhibited excellent initial activity and cyclic stability, which was attributed to their improved pore structure and surface properties. Interestingly, the generated La2Zr2O7 pyrochlore structure was also conducive to the enhancement of cyclic stability properties for OCs. In addition, all OCs displayed high-purity hydrogen (>99.5%) generation properties. Overall, the ion-conductive YSZ-supported OC showed excellent reactivity and stability. After 11 cycles, the fuel conversion deactivation and hydrogen production deactivation for LCF5YZ5 were merely 6.23 and 8.26%, respectively.
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OPTICS LETTERS
·
2024
·Vol. 49
·期 18
·5224-5227
·
IF 3.1
Xuejiao Wang,Tianzhi Jiang,Lishuo Huang,Renguang Ye,Juan Wang,Youjie Hua,Jingtao Zhao,Gongxun Bai,Shilong Zhao,Junjie Zhang,Shiqing Xu
It is crucial to explore the intrinsic mechanisms that influence thermometric sensitivity. This study investigates the optical performance of materials with the same crystal structure but different phonon energies. Ln2O2S:Er3+/Yb3+ (Ln = La/Gd/Y) phosphors with similar morphology and particle sizes were prepared to systematically study the influence of different phonon energy matrices on optical properties. The intrinsic mechanism was elucidated through the matching degree between the energy gap and phonon energy, Judd–Ofelt (J–O) theory, and quantum dielectric theory. It was ultimately concluded that the combination of high phonon energy with a large Ω2 and a small Ω6 is beneficial for enhancing the sensitivity of temperature sensing materials.
研究领域:
材料科学
·
光学
·
物理学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lei Fu,Di Wu,Yanfei Xiao,Wanfang Zou,Jinfen Kuang,Yan Liang,Fu Du,Jiaqing Peng,Xinyu Ye
Blue phosphor Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ (R = La, Gd, Lu) was prepared via solid-state reaction process, in which R 3+ replaces part of Sr 2+ ions in the matrix to benefit Eu 2+ luminescence. The change of Eu 2+ /Eu 3+ values were studied by XPS , and the results shown that the incorporation of R 3+ in the matrix resulted in the values increase of Eu 2+ /Eu 3+ . And substitute R 3+ non-equivalently for Sr 2+ , the modified Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ phosphors show better luminescence intensity and thermal stability. The emission intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ is 1.97 times of Sr 4.95 (PO 4 ) 3 Cl:0.05Eu 2+ . Moreover, the thermal quenching of Eu 2+ photoluminescence could be reduced. Compared to the commercial BAM:Eu 2+ phosphor, the stabilities of all Sr 4.72 R 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ (R=La 3+ , Gd 3+ and Lu 3+ ) phosphors are better than that of BAM:Eu 2+ at the temperatures below 100 °C. The luminescent intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ maintains 95% while BAM:Eu 2+ is only 88% of the initial intensity at 150 °C. By combining Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ , Y 3 (Al,Ga) 5 O 12 :Ce 3+ and CaAlSiN 3 :Eu 2+ with 400 nm near-ultraviolet LED chip, a white-light-emitting diode was obtained. The fabricated WLED device with CIE color coordinates x = 0.3896, y = 0.3788, low CCT (3775 K) and high Ra (95.1), has enormous potential application in full-spectrum lighting field.
研究领域:
材料科学
·
光学工程
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122405
·
IF 7.5
Xiangwu Meng,Liangji Xu,Jianjun Li,Xuekai Wang,Junshu Wu
Loofah sponge carbon (LOC) was employed as a three-dimensional scaffold and magnetized through alkaline hydrothermal treatment followed by co-precipitation to obtain magnetic loofah sponge carbon (MLOC). Subsequent lanthanum incorporation produced La₃-MLOC, which integrates a hierarchically porous architecture with magnetic separability for phosphate removal from complex waters. La₃-MLOC delivered a Langmuir capacity of 117.32 mg/g at pH 3 and showed rapid uptake across pH 3–6, achieving > 90% removal within 15–40 min while maintaining good tolerance to common coexisting ions. Kinetic fitting (PSO and Avrami, n ≈ 0.82) suggests a predominantly site-specific chemisorption pathway. Microscopic and spectroscopic analyses support La–OH-mediated hydroxyl displacement/inner-sphere complexation, accompanied by partial LaPO₄ precipitation. The sorbent retained high performance over four adsorption–desorption cycles (removal about 92%; desorption about 77%). When evaluated using real effluent from a coal-mining subsidence outfall, La₃-MLOC enabled low-level phosphate polishing to Class III targets at low dosage and short contact time, with an estimated treatment cost of 0.341 USD/g, indicating its potential for end-of-pipe phosphate control and resource-oriented management.
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FUEL PROCESSING TECHNOLOGY
·
2026
·
IF 7.8
Yongjun Zhang,Xiaodan Zhang,Yulong Zhao,Jiayu Zhang,Hongjing Han,Enhao Sun,Yanan Zhang,Yanguang Chen,Chunming Xu
La/P/HZSM-5 with multi-level pore structure was synthesized via a stepwise dual-template strategy. • The La/P/HZSM-5 zeolite reduces Brønsted acidity and creates Lewis acidity. • The optimal acidity of La/P/HZSM-5 promotes radical and monomolecular cracking. The enhancement of ethylene yield via catalytic cracking presents a persistent challenge in addressing ethylene supply shortages. A series of bifunctional catalysts (La/P/HZSM-5) were prepared via simultaneous incorporation of lanthanum and phosphorus into HZSM-5 zeolite. The Py-IR analyses revealed that the simultaneous introduction of lanthanum and phosphorus resulted in a decrease in the Brønsted acid content of the La/P/HZSM-5 catalyst from the HZSM-5 (0.792 mmol/g) to 0.223 mmol/g. Further analysis of the structure-activity relationship between the catalyst and its performance reveals that the low Brønsted acid and porous structure effectively promotes the monomolecular decomposition of the cracking process. It was evident that the synergistic modification has resulted in the La/P/HZSM-5 catalyst demonstrating superior performance in n -octane cracking, with a cracking mechanism ratio (CMR) of 49.35. The balanced metal-acid functionality of the La/P/HZSM-5 catalyst was found to result in C 2 H 4 yields of 31.23% from n -octane and 19.18% from diesel, representing increases of 31.11% and 50.20%, respectively, compared to the parent HZSM-5 (23.82% and 12.77%). The present work provided a theoretical foundation for the design of metal-acid bifunctional catalysts, with a view to improving ethylene production in catalytic cracking processes. Download: Download high-res image (260KB) Download: Download full-size image
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JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Danfeng Deng,Wenjing Song,Weizuo Li,Qiang Li,Xin Wang
A composite metal-organic frameworks (MOFs) structure, designated as Co-hmta@La-salen, was synthesized through coordination interactions between a one-dimensional lanthanum MOFs (La-salen) with high density of uncoordinated imine (–CH=N–) groups and a cobalt-based MOFs (Co-hmta) structure prepared using hydrogen bonding stacking with hexamethylenetetramine (hmta) as the organic ligand. Subsequently, the Co-hmta@La-salen composite was chosen as a template for the pyrolysis process to synthesize a La(OH) 3 supported metallic Co catalyst incorporating carbon-nitrogen (Co/La(OH) 3 -CN-hmta) catalyst. The catalytic results show that Co/La(OH) 3 -CN-hmta (54% and 46% selectivity for aniline and N-phenylbenzylamine, respectively) displays superior cascade performance compared to classic Co/La(OH) 3 -CN-nit catalyst (69% and 31% selectivity for aniline and N-phenylbenzylamine, respectively). Moreover, the kinetic test results indicate that N-alkylation is the rate-limiting step of the overall cascade reaction. The Co/La(OH) 3 -CN-hmta catalyst can be separated from the reaction system using a magnet, and it also exhibits good cyclic stability. All of these suggest that the “MOFs plus MOFs via coordination” templating method can be employed as an efficient strategy for the preparation of supported catalysts.
研究领域:
化学
·
催化材料科学
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.6
Yuanyuan Liao,Jieran Xie,Lei Sun,Zongyi Huang,Jing Li,Feng Liu,Yongxiu Li
Oxygen evolution reaction (OER) is a critical challenge in electrochemical water splitting, necessitating the development of efficient catalysts. In this study, a room-temperature gas–liquid diffusion strategy is presented to synthesize rare earth-doped NiCo₂O₄ nanosheets on carbon paper (RE-NiCo₂O₄/CP, RE = La, Ce, Pr, Gd) as alkaline OER electrocatalysts. Among them, Ce-NiCo₂O₄/CP demonstrates catalytic activity, requiring an overpotential of only 265 mV to achieve a current density of 20 mA cm⁻² in 1 M KOH, which is lower than that of undoped NiCo₂O₄/CP (348 mV). Comprehensive characterization reveals that RE doping modulates the electronic structure of NiCo₂O₄, increasing the Co 3+ /Co 2+ ratio and optimizing intermediate adsorption. Notably, Ce doping facilitates the formation of highly active Ni(Co)OOH species during OER, further enhancing catalytic performance. Combination experiments and in-situ analysis confirmed that the increase in activity was due to the incorporation of rare earths, which enhanced the charge transfer of reaction intermediates and promoted the formation of highly active phases. This work not only presents a synthesis method for high-performance OER catalysts, but also elucidates the electronic modulation effect into the role of rare-earth elements in tuning electrocatalytic properties.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Linghui Wei,Meng Li,Yibo Zhang,Qian Zhang
Modified metal-organic framework (MOF) materials are promising adsorbents for phosphate removal in aquatic environment. Herein, a high-efficiency and eco-friendly La/Ca composite (La/Ca-BTC) was designed by calcining La/Ca MOFs for phosphate adsorption. Batch adsorption experiments showed that La/Ca-BTC-3/1 (La: Ca molar ratio of 3: 1) had an excellent phosphate sorption capacity of 101.01 mg P/g, and could also maintain relatively high adsorption in the range of pH 4–8. Anion coexistence experiments showed that, except for carbonate ions, common anions have little effect on adsorption. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analysis indicated that oxygen vacancies formed in the La/Ca-BTC, probably by metal doping . The density functional theory (DFT) calculation showed that oxygen vacancies could affect the orbital hybridization energy during phosphate adsorption by changing the state density, reducing the bond energy barrier for phosphate adsorption, thereby enhancing the adsorption effect of La/Ca-BTC. Phosphate adsorbents generally incur severe environmental risk by their gradual release of metal ions due to changes in water quality, especially where there is high natural organic matter (NOM). The DFT calculation further demonstrated that Ca 2+ in the La/Ca-BTC was more inclined to combine with humic acid (HA) than La 3+ . Therefore, due to the introduction of Ca 2+ , La/Ca-BTC exhibited lower La-release in the presence of HA than La-BTC, which could be reduced by about 52.04%. Furthermore, La/Ca-BTC had the potential to simultaneously remove NOM which has important implication for aquatic remediation. These results are of great significance for the development of environmentally friendly phosphate adsorbents.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fukang Chen,Yilin Zhang,Yang Li,Yan Yan,Lishun Yang,Xinyu Zeng,Tao Deng,Huanghui Nie,Gang Liu,Lixue Zhang
(1- x )Ba 0.65 Bi 0.07 Sr 0.245 TiO 3 - x R 2 O 3 (BBST- x R) ceramics embellished by lanthanides (La, Yb, Gd) were synthesized in this study, and the effects in properties were ascertained. The results show that lanthanides with smaller ionic radius differences and larger relative mass will effectively limit mass transport of other cations and restrain grain growth. It is also found that the paraelectric phase of ceramics can be stabilized by decreasing the ionic radius of lanthanides. In particular, the addition of La unfolds the exceptional recoverable storage density ( W rec ) up to 2.23 J/cm 3 and efficiency ( η ) of ∼76.7% under 280 kV/cm. Finite element simulation and PFM observation also further explain the reasons for the excellent performance. Concurrently, BBST-0.015La ceramic exhibits outstanding thermostability from 30 °C to 150 °C and frequency stabilization from 1 Hz to 300 Hz which indicates the potentiality of application in actual surroundings.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hoang Nguyen Tien,Fredrick M. Mwazighe
In this work, a novel La-doped βPbO 2 (Ti/SnO 2 –Sb/La-βPbO 2 ) was prepared using electrodeposition method and applied to the degradation of prednisolone (PRD), 8-Hydroxyquinoline (8-HQ), and other typical organic pollutants. Compared with the conventional electrode Ti/SnO 2 –Sb/βPbO 2 , La 2 O 3 doping enhanced oxygen evolution potential (OEP), reactive surface area, stability and repeatability of the electrode. The 10 g L −1 of La 2 O 3 doping exhibited the highest electrochemical oxidation capability of the electrode with [•OH]ss being determined at 5.6 × 10 −13 M. The quenching experiments were conducted to confirm the main oxidizing species (here: •OH) in the electrochemical process. The study showed that the pollutants were removed in the electrochemical (EC) process with different degradation rates and indicated that the second-order rate constant of organic pollutants towards •OH ( k OP,•OH ) has a linear relationship with the degradation rate of organic pollutants ( k OP ) in the electrochemical process. Another new finding in this work is that a regression line of k OP,•OH and k OP can be used to estimate k OP,•OH of an organic chemical, which cannot be determined using the competition method. k PRD,•OH and k 8-HQ,•OH were determined to be 7.4 × 10 9 M −1 s −1 and (4.6–5.5) × 10 9 M −1 s −1 , respectively. Compared with conventional supporting electrolyte (like SO 4 2− ), H 2 PO 4 − and HPO 4 2− improved k PRD and k 8-HQ by 1.3–1.6-fold, while SO 3 2− and HCO 3 − inhibited k PRD and k 8-HQ significantly, down to 80%. Additionally, the degradation pathway of 8-HQ was proposed based on the detection of intermediates from GC-MS.
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