ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
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2016
·Vol. 22
·期 3
·327-334
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IF 1.87
Liu Dongjing,Zhou Weiguo,Wu Jiang
Perovskite LaMnO 3 /ZSM-5 was used for reactive adsorption of hydrogen sulfide at 500–700 °C. The sorbents showed good desulphurization performance, the highest sulfur capacity of 1020 µmol S/g over 5La5Mn/ZSM-5 was obtained at 600 °C. The reducing gases (H 2 and CO) can obviously shorten the breakthrough time and reduce the sulfur capacity. Incorporating Mn ions into La 2 O 3 lattice improved the sulfidation activity due to the formation of perovskite LaMnO 3 with good reducibility and structure stability.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 17
·21923-21931
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IF 2.478
Wu Ruifeng,Lin Yuanwei,Liu Yafei,Chang Aimin,Zhao Pengjun,Zhang Bo
In this study, x LaMnO 3 -(1 − x )CaCu 3 Ti 4 O 12 (0 ≤ x ≤ 0.7) composite ceramics have been prepared by the conventional solid-state method. XRD results show that the composite ceramics are mainly composed of LaMnO 3 and CaCu 3 Ti 4 O 12 phases. Electrical property analysis shows that the resistivity ρ 25 gradually decreases from 2.17 × 10 8 to 1.74 × 10 5 Ω·cm with increasing LaMnO 3 content. The relationship between ln ρ and 1000/ T is not linear and changes around 350 °C. In the temperature range of 0–350 °C, the activation energy E a 0–350 °C decreases gradually with the increase of the LaMnO 3 content. In the temperature range of 350–500 °C, the activation energy E a 350–500 °C increases first and then decreases, which is related to the variation of oxygen vacancy. The compounding of LaMnO 3 gives rise to the decrease in B value, thus, providing the potential for the applications of wide temperature range thermistors. After annealing, the coefficient of aging (Δ R / R ) of the composites decreases from 23.73 to 3.01%.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
Materials
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2022
·Vol. 15
·期 17
·5928
·
IF 3.748
Keyu Guo,Yaqiu Tao,Yunfei Liu,Yinong Lyu,Zhigang Pan
Epitaxial LaMnO3thin films were grown on SrTiO3substrate using a one-stage hydrothermal route from La(NO3)3, MnCl2and KMnO4in an aqueous solution of 10 M KOH at 340 °C. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) indicate full coverage of LaMnO3on the substrate. X-ray diffraction in the symmetric ω/2θ mode suggests the film has an out-of-plane preferred orientation along the [001] direction of the substrate. The LaMnO3epitaxial thin film growth mechanism is proposed based on the analysis of the atomic sharp interface formed between LaMnO3and the SrTiO3substrate, as seen by aberration−corrected scanning transmission electron microscopy (AC−STEM) imaging in combination with electronic energy loss spectroscopy (EELS). Compared with the conventional vapor deposition methods, the one-stage hydrothermal route opens up a new way to fabricate complex oxide epitaxial heterostructures.Keywords:LaMnO3;hydrothermal;epitaxy;thin film;interface;strain
研究领域:
材料科学
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物理学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinwei Qin,Peng Zhao,Jie Meng,Shixiang Zuo,Xiaohui Wang,Wei Zhu,Wenjie Liu,Jingwei Liu,Chao Yao
Higher specific surface area and abundant surface oxygen vacancies are considered to be essential to the catalytic combustion. Herein, we elaborately fabricated an innovative catalyst on the basis of LaMnO 3 @Co 2 MnO 4 under a controllable selective dissolution (SD) treatment for ethane catalytic combustion. La element in perovskite could effectively protect the spinel system as a sacrifice, with MnO 2 covering on the spinel surface, thereby enhancing the activity and stability. In combination with XPS, in-situ DRIFT and various characterization results, this acid corrosion could provide induce better reducibility, larger specific surface area, higher Mn 4+ and Co 3+ content and more oxygen vacancies , which played a significant role in promoting the adsorption, activation and decomposition of ethane. Among all as-prepared catalysts, the optimal performance for catalytic ethane combustion was achieved on LMO@CMO-10 catalyst. The T 90 of LMO@CMO-10 was 341 °C under space velocity of 80,000 mL·g −1 ·h −1 . This work not only fabricated the catalyst system with higher specific surface area and more oxygen vacancy by SD method, but also provided a potential strategy for the preparation of highly active catalysts.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Liying Jiang,Zhiwei Yao,Pengju Wang,Jianmeng Chen,Yufen Zhang,Wu Huang,Xiang Cao,Yufeng Xu
Plasma-catalytic removal of chlorobenzene (CB) was conducted in a dielectric barrier discharge (DBD) reactor over two manganese-based catalysts, LaMnO 3 and cryptomelane-type octahedral molecular sieve (OMS-2). The physicochemical properties of two catalysts were characterized by XRD , SEM, TEM , BET, XPS and H 2 -TPR. It was shown that OMS-2 catalyst had larger surface area, smaller particle size, better redox properties, higher ratio of Mn 4+ /Mn 3+ and higher content of surface-adsorbed oxygen (O ads ). The introduction of manganese-based catalysts enhanced CB removal, increased the CO 2 selectivity , and inhibited ozone (O 3 ) and NO x formation. OMS-2 exhibited a better degradation, mineralization and energy yield, with 89.5% of CB degradation, 57.6% of CO 2 selectivity and 0.54 g kWh −1 at discharge voltage of 6 kV, than LaMnO 3 in the NTP-catalytic reactor and this was ascribed to more active sites, more O ads , higher redox property and better O 3 decomposition ability on OMS catalyst surface. The two manganese-based catalysts were stable in the NTP-catalysis system although some intermediate byproducts were deposited on the catalyst surface during the 24-h activity cycling tests. Moreover, the intermediate byproducts were analyzed by GC/MS, and then the possible degradation pathways of CB decomposition in the plasma-catalysis system were suggested.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 1
·131
·
IF 3.9
Jingwei Wang,Xiaocen Liang,Zifan Xing,Haitao Chen,Yang Li,Da Song,Fang He
As a novel reaction mode of oxidative dehydrogenation of ethane to ethylene, the chemical looping oxidative dehydrogenation (CL-ODH) of ethane to ethylene has attracted much attention. Instead of using gaseous oxygen, CL-ODH uses lattice oxygen in an oxygen carrier or redox catalyst to facilitate the ODH reaction. In this paper, a perovskite type redox catalyst LaMnO3+δwas used as a substrate, Ce3+with different proportions was introduced into its A site, and its CL-ODH reaction performance for ethane was studied. The results showed that the ratio of Mn4+/Mn3+on the surface of Ce-modified samples decreased significantly, and the lattice oxygen species in the bulk phase increased; these were the main reasons for improving ethylene selectivity. La0.7Ce0.3MnO3showed the best performance during the ODH reaction and showed good stability in twenty redox cycle tests.Keywords:chemical looping oxidative dehydrogenation;LaMnO3;Ethane;perovskite type redox catalyst
研究领域:
化学工程
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催化科学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2022
·
IF 5.436
Weiran Zhu,Nan Hao,Chen Chen,Yu Qiu,Yanli Zuo,Jie Wei,Jing Qian,Kun Wang
The performance-enhancing strategy of a single pathway for perovskite has been widely studied. In this work, the dual-pathway strategy of A-site Ce substitution and nitric acid selective dissolution was proposed. The catalytic oxidation performance of LaMnO3 exhibits the characteristic of hierarchical regulation, that is, a steplike improvement, which avoids the limitation of performance improvement of the single pathway. The B-site Mn with catalytic activity was in situ reconstituted on the surface to build a Mn-rich surface. The obtained sdLa0.7Ce0.3MnO3 has the advantages of good oxygen mobility, high Mn4+/Mn3+ molar ratio, and large specific surface area, and this material showed excellent catalytic oxidation performance for organics, which can realize colorimetric chemical oxygen demand detection at room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio of Mn4+/Mn3+, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased the specific surface area.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11005-11010
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IF 2.195
Ma Qilu,Zhao Qing,Jia Xuemei,He Donglin,Chang Aimin
This paper had reported a new conception about the bilayer negative temperature coefficient (NTC) thermistors ceramics. To be specific, the ceramics were constituted by two layers, among which, the perovskite-structured LaMnO 3 was used to maintain the NTC properties of the material, while the LaMnO 3 –Y 2 O 3 composite ceramic was selected due to its resistance. The bilayer NTC thermistors were successfully fabricated according to the classical uniaxial pressing method in this study. After sintering at 1350 °C for 6 h, the two layers could well integrate with each other, without any cracks. Moreover, the values of ρ 500 , B 500/900 constant and activation energy of the NTC thermistors were within the ranges of 2.20 × 10 5 –1.46 × 10 8 Ω cm, 6293–11218 K, 0.543–0.968 eV, respectively. Such ceramics would be suitable for the high temperature application of NTC thermistors.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Duo Xu,Liqiang Luo,Yaping Ding,Lin Jiang,Yuting Zhang,Xiaoqian Ouyang,Bingdi Liu
We have developed a nonenzymatic electrochemical sensor based on a carbon paste electrode modified with electrospun LaMnO 3 fibers for fructose determination. LaMnO 3 fibers, a kind of perovskite-type oxide, were prepared by electrospinning and subsequent calcination process. The morphology and structure of LaMnO 3 fibers were characterized by scanning electron microscope, X-ray diffraction and Fourier Transform Infrared spectrum. The electrochemical response of the proposed sensor was evaluated by cyclic voltammetry and amperometry. Under optimal conditions, the linear response for fructose determination was obtained in the range of 0.4–100 μM, with a low detection limit of 63 nM ( S / N = 3).
研究领域:
电化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Peng Zhao,Jingwei Liu,Wei Zhu,Jie Meng,Zhuang Li,Jinwei Qin,Xiaohui Wang,Haiqin Wan,Chao Yao,Lin Dong
Catalytic combustion is one of effective ways to remove short-chain alkanes. In this study, we elaborately designed a novel catalyst of in situ Co-Mn decorated LaMnO 3 perovskite for ethane catalytic combustion, in which extra Mn and Co species were introduced via acidic KMnO 4 and Co(NO 3 ) 2 solution precipitation method. The addition of Mn and Co could not only slightly etch LaMnO 3 , thereby increasing specific surface area and redox property, but also generate new active phase CoMn 2 O 4 , thus accelerating reaction. Among all the as-prepared catalysts, CMO/LMO-0.5 exhibited admirable ethane removal efficiency with a T 90 of 365 °C, a reaction rate of 0.46 mmol·g −1 ·h −1 , a TOF value of 0.64 mmol·g −1 ·h −1 , and excellent hydrothermal stability and reusability. Moreover, according to in situ DRIFTS, a possible pathway was proposed. This work can rationalize an alternative approach to develop an active catalyst for short-chain alkanes catalytic combustion or other catalytic systems.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Qianyi Wang,Wan Yu,Wenjun Xu,Zhen Li,Xiren Xia,Yin Xu
Doping strategies are widely employed to enhance the catalytic activity of perovskites for peroxymonosulfate (PMS) activation in removing organic pollutants in water. However, limited research has explored the performance enhancement and underlying mechanism associated with trace doping, which is particularly important for saving dopant metals and cost, and also lower the risk of metal ion loss. In this study, we investigated the profound effects of trace copper doping in LaMnO 3 on PMS activation for contaminant removal. Compared to pristine LaMnO 3 , the catalytic oxidation performance was significantly enhanced by trace copper doping (1.3 wt% Cu), achieving over 91.0 % removal of acid orange 7 (AO7) within 45 min using the LaMn 0.95 Cu 0.05 O 3 (LMC5)/PMS system. Comprehensive characterizations revealed that copper incorporation primarily fortified the redox ability and electron transfer efficiency of LaMnO 3 , thereby improving its catalytic efficacy. Furthermore, unlike previous studies reporting on radical oxidation mechanisms, the surface PMS* complexes with Mn(III) serving as the active sites were identified as the predominant reactive species responsible for pollutant degradation. The intermediates of pollutant degradation were identified and their toxicity was also assessed by ECOSAR program. The system's practical feasibility was further underscored by treating diverse contaminants and evaluating the interference of coexisting anions in water. Briefly, this study provides valuable insights into enhancing the catalytic activity of perovskites for PMS activation in water treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2023
·
IF 4.1
Meiling Zhan,Minghao Fang,Liangyu Li,Yajing Zhao,Bozhi Yang,Xin Min,Pengpeng Du,Yan'gai Liu,Xiaowen Wu,Zhaohui Huang
In the pursuit of enhancing the property of photocatalytic hydrogen production , strategies for enhancing light absorption and the separation and transport efficiency of photo-induced carriers have been studied. Perovskite photocatalyst has great application potential in the field of photocatalytic hydrogen production due to its special crystal structure. LaMn (1-x) Fe x O 3 (x = 0–0.08) perovskite nanofibers with diameters of 50–200 nm were synthesized by electrospinning, and their photochemical properties were investigated. The results of UV–Vis diffuse reflectance spectroscopy, PL spectroscopy, I-t, and EIS revealed that the doping with Fe could improve light absorption and reduce the recombination rate of photogenerated electron-hole pairs, and improve the separation and transfer efficiency of photogenerated electron-hole pairs, likely due to the increased concentration of oxygen vacancies caused by doping. Through optimization of the Fe doping amount, an improved hydrogen production efficiency of 767.71 μmol h −1 g −1 was achieved for LaMn 0·96 Fe 0·04 O 3 , which is 2.5 times the efficiency of undoped LaMnO 3 (300.74 μmol h −1 g −1 ). These results provide a new idea for the development of efficient photocatalysts for hydrogen production.
研究领域:
材料科学
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能源科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）