INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Jiamin Huang,Guanghui Zhang,Jie Zhu,Mingrui Wang,Fanshu Ding,Chunshan Song,Xinwen Guo
The catalytic conversion of CO2 to higher alcohols (HAs, representing ethanol and alcohols with more than two carbon atoms) has been of great interest to mitigating the greenhouse effect and effectively utilizing CO2. However, most present catalysts have disadvantages of poor activity (conversion less than 30%) and selectivity (less than 10%) and high price. Herein, we report a Mn- and K-modified iron carbide catalyst that offers a CO2 conversion higher than 40% and a selectivity of higher alcohols exceeding 10%, and the proportion of propanol and butanol in alcohol products is more than 30%. Unpromoted iron carbide has a strong ability of hydrocarbon chain growth, leading to the fast formation of hydrocarbon products rather than HAs. However, on the Mn- and K-modified iron carbide catalyst, K is used to increase the surface C/H ratio of the catalyst by enhancing the adsorption of CO2 on the catalytic surface. The increased C/H ratio is indispensable to the formation of HAs, and the addition of Mn promoter dramatically improves the production of HAs, especially the formation of propanol and butanol. The synergistic effect between Mn and K on iron carbide is the key to produce HAs. In addition, the Mn- and K-modified iron carbide is of low cost, which can potentially provide an alternative for the hydrogenation of CO2 to produce valuable chemicals.
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高影响因子
Molecular Catalysis
·
2018
·
IF 0
Zhanao Lv,Cholho Choe,Yunfeng Wu,Haibin Wang,Zhuqi Chen,Guangxing Li,Guochuan Yin
This work demonstrates a novel strategy that the introduction of non-redox metal ions as Lewis acids to the classic dinuclear manganese complex [Mn IV 2 (μ-O) 3 (Me 3 tacn) 2 ](PF 6 ) 2 can greatly promote the alkene epoxidation efficiency under mild conditions with H 2 O 2 as the solely terminal oxidant because of its economic and environmental advantages. When [Mn IV 2 (μ-O) 3 (Me 3 tacn) 2 ](PF 6 ) 2 was used as the catalyst in the absence of Lewis acids, only 16.4% conversion of cyclooctene with 6.2% yield of epoxide was obtained and the obvious decomposition of H 2 O 2 was observed. However, the oxygen transfer efficiency of the catalyst was sharply improved with 100% conversion and 90.2% yield of epoxide under identical conditions when the non-redox metal ion, such as Sc 3+ , was introduced to the catalytic system. The novel strategy was successfully applied to the epoxidation reactions of different types of alkenes. Through UV–vis, FT-IR, EPR and CV characterizations, it was evidenced that the non-redox metal ions with high positive charge as Lewis acids could dissociate the sluggish dinuclear Mn-(μ-O) 3 -Mn core and the open-loop dinuclear manganese complex, HO-Mn III -(μ-O)-Mn IV = O or O = Mn IV -(μ-O)-Mn IV = O, was proposed as the active species, which was capable of the alkene epoxidation process. This work illustrated an alternative protocol to manipulate the reactivity of those sluggish catalysts by the introduction of non-redox metal ions and provided clues to understand the role of non-redox metal ions in metalloenzymes and heterogeneous catalysts.
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DOI
IONICS
·
2022
·Vol. 28
·期 7
·3525-3536
·
IF 2.961
Lu Jingling,Xu Cunying,Li Jianru,Wang Shuxian,Xiang Qinqin,Chen Xiao,Hua Yixin,Li Yan
The effects of nicotinic acid (NA) on the electrodeposition of Al-Mn alloy have been investigated in aluminum chloride-1-butyl-3-methylimidazolium ionic liquids (AlCl 3 -BMIC) containing 0.15 mol·L −1 MnCl 2 (AlCl 3 -BMIC-MnCl 2 ). The electrochemical behaviors of the AlCl 3 -BMIC-MnCl 2 electrolyte have been studied here using cyclic voltammetry and potentiodynamic polarization. The addition of NA obviously increased the nucleation overpotential of Al-Mn alloy and inhibited the reduction reaction of Al(III) and Mn(II). The resultant surface morphologies, composition, and roughness of the Al-Mn alloy coating were revealed by scanning electron microscopy (SEM), transmission electron microscope (TEM), and atomic force microscopy (AFM). It was found that these additives strongly affect the morphology, composition, roughness, and crystal structure of the Al-Mn alloy coating. With the addition of NA, the content of Mn decreased, and Al-Mn alloy coatings became more uniform and smoother. The crystal structure of Al-Mn coatings was also examined by X-ray diffraction (XRD), where it was found that the phase composition of the deposits depends on the quantities of additives. For electrolyte containing little or no NA additives, the resulting alloy is amorphous structure. With NA additives up to 6·mmol L −1 , the Al-Mn coating changed into a mixture phase of amorphous and crystalline structure.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 22
·23162-23172
·
IF 2.914
Yu Jie,Wang Hongjie,Ji Qinghua
In aquatic environment, the existence of antibiotics including sulfadiazine (SDZ) has gain a huge attention. It is suggested that hydrous metal oxides have large potential to remove contaminants in water. The SDZ removal capability by ferric and manganese binary oxides (FMBO) was investigated, and the SDZ removal performance was compared with the ferric hydroxide (HFO) and manganese dioxide (HMO). Our results showed that SDZ removal was highly pH-dependent, but pH has less effect on uptake of SDZ on FMBO than that of the other two adsorbents. The surface acidity constant of FMBO was first calculated to be 6.31 and 8.48, respectively. The uptake process was successfully fitted for according to surface complex formation models (SCFM) and the results of modern surface analytical methods, such as FTIR and XPS, were also consistent with the surface complex uptake mechanism. The uptake of SDZ by FMBO ascribed to specific chemical interaction between the aniline group of SDZ and the hydroxyl groups from FMBO.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhengqing Pei,Jiawei Wang,Haifeng Wang,Kexin Zheng,Qian Wang,Xinjie Zhou,Dehua Ma,Ju Lu,Haijiao Xie
The spinel-structured LiMn 2 O 4 cathode material exhibits low specific capacity and rapid capacity decay under high current densities , significantly limiting its commercial application prospects. This study uses a coprecipitation and calcination method to dope Zn into LiMn 2 O 4 , discovering that doping Zn elements causes LiMn 2 O 4 to preferentially grow along the (110) and (100) crystal planes. The (110) and (100) crystal planes provide more Li ion channels, contributing to the improvement of rate performance. In the custom-designed LiZn 0.04 Mn 1.96 O₄ (LZMO-0.04) cathode, the strategic addition of Zn occupying Mn sites makes electrons more delocalized, increasing the free electron gas and enhancing the material’s conductivity. The LZMO-0.04 sample exhibits a rich variety of polymorphic morphologies, a lower Mn³⁺ content, and a higher Li⁺ diffusion coefficient . These optimization effects, resulting from the synergistic action of multiple factors, enabled the LZMO-0.04 sample to achieve an initial discharge capacity of 127.73 mAh/g with a capacity retention rate of 83.06 % after 300 cycles at a rate of 0.5C. Even with an increase to a high rate of 5 C over 1200 cycles, the capacity retention rate remained stable at 81.89 %, exhibiting excellent high-rate cycle stability.
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高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Qing-Ling Cao,Wen-He Zhong,Jie-Yu Zhu,Cai-Hong Shi,Jia-Jia Zhao,Li-Zhuang Chen
Organic–inorganic hybrid metal halides have emerged as promising luminescent materials owing to their structural tunability and exceptional photoluminescence modulation capabilities, showing great potential in optoelectronic applications. Herein, we report the successful design of a novel series of zero-dimensional (0D) Mn(II)-based organic–inorganic hybrid halides with enhanced photoluminescence quantum yields (PLQYs) through strategic organic cation engineering. Specifically, in this paper, the methyl group (–CH3) at the fourth position of the benzene ring in the organic cation was replaced with hydrogen (–H) and cyano (–CN) groups. The average distance of Mn⋯Mn was successfully adjusted from 8.925 Å to 8.970 Å and 8.986 Å, and the PLQY was modulated from 35.74% to 59.04% and 81.38%. This work establishes a new paradigm for rationally designing high-performance luminescent materials through molecular-level structural engineering, providing valuable insights for developing advanced optoelectronic devices in sensing, information encryption, and radiation detection applications.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jing Liu,Hongxi Zhu,Lin Liu,Luliang Liao,Lingfang Qiu,Xun Xu,Youliang Shen,Ping Li,Xiaoyue Shi,Shuwang Duo
Nitrogen-defect-rich DCN enables Mn–N interfacial coupling with MnCo 2 S 4 . • Interfacial Mn–N bonding and S-scheme charge transfer promote efficient charge separation. • Enhanced ROS generation is achieved in the heterojunction under visible-light irradiation. • Optimized catalyst shows high visible-light activity and stability for TC degradation. • Degradation pathways and toxicity evolution demonstrate the deep mineralization and detoxification of TC. Constructing well-defined heterointerfaces is crucial for regulating charge separation and surface reactions in photocatalysts. Herein, MnCo 2 S 4 /g‑C 3 N 5 S-scheme heterojunctions were fabricated via an in-situ growth strategy, in which defect-associated nitrogen sites in g‑C 3 N 5 act as coordination centers to anchor Mn, forming well-defined Mn–N interfacial bonds. XANES/EXAFS analyses and density functional theory calculations confirm the presence of Mn–N coordination at the interface and reveal its role in tailoring the local coordination environment and electronic configuration of Mn. The Mn–N coupled heterointerface promotes directional separation and transfer of photogenerated carriers, as evidenced by photoelectrochemical measurements, electron spin resonance and femtosecond transient absorption spectroscopy, which demonstrate accelerated charge migration and enhanced generation of reactive oxygen species. Benefiting from this interfacial Mn–N bonding-driven charge separation, the optimized MnCo 2 S 4 /g‑C 3 N 5 -II heterojunction achieves markedly improved visible-light photocatalytic activity toward tetracycline degradation, reaching ~90.8% removal within 120 min with an apparent rate constant of 0.01371 min −1 , which far surpasses the individual components. This work highlights interfacial Mn–N bonding engineering as an effective strategy for constructing robust S-scheme heterojunctions with promoted charge separation and surface redox processes. Download: Download high-res image (182KB) Download: Download full-size image
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高影响因子
MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 11
·718
·
IF 5.4
Ma Chen,Zhang Yida,Mu Shuai,Zhang Yuan,Wei Shuoyun,Li Quanfang,Ren Shufang
A novel Hg 2+ sensing strategy has been developed based on a Mn-Au hybrid nanozyme with prominent oxidase-like activity and an aptamer-controlled catalytic switching mechanism. First, a Mn-Au hybrid nanozyme (MnAuNPs) with a distinctive “fried-egg-like” core–shell morphology was synthesized, which exhibited remarkable oxidase-like activity and rapidly oxidized 3,3’,5,5’-tetramethylbenzidine (TMB) into the characteristic blue product (OxTMB) without H 2 O 2 . The Hg 2+ -specific aptamer can adsorb onto the surface of MnAuNPs through electrostatic and Mn-phosphate coordination interactions, which blocks the catalytic sites and markedly suppresses the oxidase-like activity. In the presence of Hg 2+ , the specific T-Hg 2+ -T coordination triggers the detachment of the aptamer from the MnAuNPs surface, thereby restoring oxidase-like activity and inducing distinct color and absorbance change. Accordingly, an effective colorimetric platform for Hg 2+ detection was developed, exhibiting a linear response over the range of 1.0–50 μM with a limit of detection (LOD) of 0.32 μM. In parallel, a paper-based smartphone-assisted sensing platform was developed, enabling on-site Hg 2+ detection in the range of 5.0–50 μM with LOD of 5.0 μM. Through the colorimetric and smartphone-assisted method, accurate quantification of Hg 2+ in the Yellow River water and wastewater samples were achieved with the results in good agreement with those obtained by ICP-OES. Overall, this work establishes a simple and portable H 2 O 2 -free colorimetric sensing strategy based on Hg 2+ -induced catalytic switching for environmental Hg 2+ monitoring. Graphical
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hongdian Chen,Chuanlan Xu,Lingtao Sun,Chaozhong Guo,Haifeng Chen,Chenyang Shu,Yujun Si,Yao Liu,Rong Jin
Applications of zinc-air batteries are partially limited by the slow kinetics of oxygen reduction reaction (ORR); Thus, developing effective strategies to address the compatibility issue between performance and stability is crucial, yet it remains a significant challenge. Here, we propose an in situ gas etching-thermal assembly strategy with an in situ -grown graphene-like shell that will favor Mn anchoring. Gas etching allows for the simultaneous creation of mesopore-dominated carbon cores and ultrathin carbon layer shells adorned entirely with highly dispersed Mn-N 4 single-atom sites. This approach effectively resolves the compatibility issue between activity and stability in a single step. The unique core–shell structure allows for the full exposure of active sites and effectively prevents the agglomerations and dissolution of Mn-N 4 sites in cores. The corresponding half-wave potential for ORR is up to 0.875 V (vs. reversible hydrogen electrode (RHE)) in 0.1 M KOH. The gained catalyst (Mn-N@Gra-L)-assembled zinc-air battery has a high peak power density (242 mW cm −2 ) and a durability of ∼ 115 h. Furthermore, replacing the zinc anode achieved a stable cyclic discharge platform of ∼ 20 h at varying current densities. Forming more fully exposed and stable existing Mn-N 4 sites is a governing factor for improving the electrocatalytic ORR activity, significantly cycling durability, and reversibility of zinc-air batteries.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yuanchen Duan,Huan Li,Shiqing Li,Yu Zhou,Rouxin Liu,Zichun Gao,Wanbing Guan,Jun Yang,Jianxin Wang,Xiang Wan,Chunning Zhao,Weichao Wang
Thermal expansion matching is crucial for solid oxide fuel cell (SOFC) cathode design to prevent interfacial delamination or cracking. This work adopts thermal expansion coefficient (TEC) matching as the primary design principle to enable both structural stability and high catalytic activity. A Mn-based mullite-type cathode, SmMn 2 O 5 (SMO), is developed, and composite electrodes with Gd 0.1 Ce 0.9 O 1.95 (GDC) are fabricated. To reveal the structure–property relationships, TEC and electrochemical performance measurements are combined with in situ X-ray diffraction (XRD), Raman spectroscopy, and density functional theory (DFT) analysis. SMO exhibited a low TEC (8.12 × 10 −6 K −1 ) due to anisotropic lattice expansion and phonon scattering confirmed by XRD and Raman. The SMO–GDC composite displayed extremely well-matched TECs with yttria-stabilized zirconia, with only 2.36% deviation across the operating range. Electrochemically, the composite cathode achieved 580.9 mW cm −2 with polarization resistance of 0.193 Ω cm 2 and maintained stable operation for 300 h. DFT further revealed that GDC addition facilitated interfacial charge transfer and shortened Mn–Mn dimers, explaining the enhanced catalytic activity. This cathode material selection strategy, prioritizing TEC matching as the primary principle, provides a new insight into SOFC cathode development.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jingjing Liu,Mengyuan Zhang,Diru Liu,Yunbo Yu,Guangyan Xu,Hong He
Ammonia selective catalytic reduction (NH 3 -SCR) of nitrogen oxides (NO x ) is a widely adopted method for controlling NO x emissions. However, achieving superior low-temperature activity while maintaining high N 2 selectivity over a broad temperature range remains a major challenge. In this study, a novel mesoporous manganese–titanium–aluminum (Mn-Ti-MA-S) composite oxide catalyst was synthesized by a modified evaporation-induced self-assembly method. The incorporation of Mn and Ti into mesoporous alumina (MA) framework significantly optimized the redox-acidic properties of the Mn-Ti-MA catalyst, with Mn in a highly dispersed state with fully exposed microcrystalline structures. Subsequent sulfur treatment further transformed the Lewis acid sites into Brønsted acid sites, shifting the reaction pathway from a Lewis acid site-dominated to Brønsted acid site-dominated mechanism. This strategy successfully overcame the conventional trade-off between low-temperature activity and high-temperature N 2 selectivity in NH 3 -SCR catalysts. Consequently, the optimized Mn-Ti-MA-S catalyst exhibited excellent catalytic performance, achieving both NO x conversion and N 2 selectivity above 90 % over a wide temperature range (104–400 °C). This work highlights a synergistic strategy that integrates redox and acid sites engineering with reaction pathway regulation, enabling the development of highly efficient NH 3 -SCR catalysts.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2025
·
IF 1.7
Cheng Lijun,Lei Juan,Ren Xiaoli,Chang Hong,Ju Baihe
In this study, a series of La-α-MnO 2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO 2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn 3+ and O ads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO 2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO 2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.
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高影响因子
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