ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 9
·1865-1874
·
IF 0.767
NING Hong-Yan,YANG Qi-Lei,YANG Xiao,LI Ying-Xia,SONG Zhao-Yu,LU Yi-Ren,ZHANG Li-Hong,LIU Yuan
Rh-Mn-based catalysts are promising for ethanol synthesis from syngas. In this work, a carbon fiber (CF)-supported Rh-Mn catalyst, with highly dispersed Rh and close contact Rh-Mn species, has been prepared by a new in situ polymerization route using citric acid and ethylene
glycol interaction. The structure and physicochemical properties of both the calcined and reduced samples have been characterized by TPR, XRD, TEM, EDS, CO-TPD, H2 chemisorption, and XPS techniques and the catalytic performance for ethanol synthesis from syngas has been evaluated.
The results show that the new method is beneficial in forming close contact Rh-Mn species than that obtained with the conventional impregnation method. This can enhance the dispersion and sintering resistance of Rh and effectively improve the activity of CO hydrogenation and the selectivity
to ethanol in ethanol synthesis from syngas.
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RSC Advances
·
2016
·Vol. 6
·期 86
·82707-82715
·
IF 3.289
Wei Li,Rui-tang Guo,Shu-xian Wang,Wei-guo Pan,Qi-lin Chen,Ming-yuan Li,Peng Sun,Shu-ming Liu
A series of Mn/CeSiOx catalysts were prepared by the wet impregnation method and used for selective catalytic reduction of NO with NH3. As can be seen from the experimental results, the Mn/CeSiOx catalyst with a Ce/Si molar ratio of 2/1 showed excellent low-temperature SCR activity, high N2 selectivity and excellent SO2 and H2O tolerance. The relationship between the CeSiOx support and the SCR performance of Mn/CeSiOx (2 : 1) catalyst was investigated based on the characterization results of N2 adsorption, XRD, XPS, H2-TPR, NH3-TPD and in situ DRIFT. The strong interaction between Ce and Si resulted in the good dispersion of Mn species on the support; correspondingly, the redox ability and NH3 adsorption capacity were greatly enhanced. The results of in situ DRIFT study revealed that the NH3-SCR reactions over Mn/CeO2 and Mn/CeSiOx (2 : 1) mainly obeyed both the E–R mechanism and the L–H mechanism. Furthermore, the formation of more Mn4+ and chemisorbed oxygen greatly facilitates the oxidation of NO to NO2, as a result, promoting the low-temperature SCR performance of Mn/CeSiOx (2 : 1).
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chao Wu,Shuang Cao,Heng Li,Zhi Li,Gairong Chen,Xiaowei Guo,Baobao Chang,Yansong Bai,Xianyou Wang
Herein, we put forward a feasible interfacial modification strategy in virtue of Mn 3 O 4 surface coating to construct protective shell and alleviate Jahn-Teller distortion during the charge/discharge process. It has been found that the increase of the oxygen vacancy on the surface of Li 1.2 Ni 0.27 Mn 0.54 O 2 of (LRNMO) after Mn 3 O 4 protective layer modification can effectively restrain the release of oxygen and enhancing rate capability, and thus improving its comprehensive electrochemical performances. In particular, the initial coulombic efficiency of the optimized LRNMO-1 electrode is improved from 72.3% to 84.3%. The capacity retention rate is up to 95.6% at 250 mA g −1 (1C) after 200 cycles. In addition, the LRNMO-1 electrode also has a good capacity retention rate (96.4% after 100 cycles) at a high current density of 5C. Moreover, the designed LRNMO@Mn 3 O 4 cathode exhibits higher ionic conductivity and better interface stability. As a result, this work offers a practicable and valuable exploration for the development and industrialization of Co-free Li-rich Mn-based cathode materials with high energy density .
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Pan Liang,Jie Wang,Zhi-Hong Liu
A pure zinc borate, Zn[B 12 O 14 (OH) 10 ], has been synthesized and characterized by XRD, FT-IR, simultaneous TG-DTA techniques, and chemical analysis. The molar enthalpy of solution of Zn[B 12 O 14 (OH) 10 ] (s) in 1 mol·dm −3 HCl(aq) was measured by microcalorimeter at T = 298.15 K. The molar enthalpy of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol·dm −3 HCl(aq) and calculated amount of H 3 BO 3 was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpy of formation of −(9646.6 ± 9.6) kJ·mol −1 at T = 298.15 K was obtained on the basis of an appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −9492.7 kJ·mol −1 for [B 12 O 14 (OH) 10 ] 2− has also been estimated by a group contribution method, which has been used to predict the Δ f H m θ of a series of transition metal borates of M[B 12 O 14 (OH) 10 ] (M II = Mn, Zn, Fe, Co, Ni). These estimated data have been used to further compare the stability of this series of transition metal borates.
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CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Huan Zhang,Chang Liu,Yu Wang,Feifei Jia,Shaoxian Song
In this work, Mn (II) was doped into MoS 2 structure and then anchored on activated alumina beads to construct 3D-sized composites (Mn-MoS 2 @AABs). This component material was used as PMS activator for tetracycline (TC) degradation under light irradiation. According to experiment results, Mn-MoS 2 @AABs exhibited well degradation performance to TC, which ascribed to excellent photo-response property of Mn-MoS 2 and activation of Mn. Importantly, the 3D-sized structure made it facilely be recycled from solution, which catered to the demand for the practical application. Therefore, the novel strategy of designing Mn-MoS 2 @AABs had great significance for environmental restoration.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Mingxu Sui,Tianqi Fu,Xiaodong Sun,Guangzhen Cui,Xuliang Lv,Guangxin Gu
Unary and binary M 2+ (M=Mn, Co, Ni, Zn) substituted hollow Fe 3 O 4 were prepared by one-step solvothermal method. The crystallographic structure, morphology, element components and microwave absorbing properties of as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Energy-dispersive X-ray (EDX) and vector network analyzer (VNA). The unary and binary Co 2+ substitution of hollow Fe 3 O 4 could result in a significant improvement of microwave absorption performance, including the expanding of effective absorption bandwidth, the thinner thickness and the increment of absorbing intensity. The sample of CoFe 2 O 4 could reach an optimal reflection loss of − 28.78 dB at 15.52 GHz under the thickness of 1.5 mm, moreover, the efficient absorption bandwidth (less than −10 dB) is expanded to 5.56 GHz which is most outstanding among these samples. The minimum reflection loss of Co 0.75 Zn 0.25 Fe 2 O 4 could reach − 49.60 dB at 9.88 GHz under the thickness of 2 mm. The as-prepared products could be used as microwave absorber with the advantages of strong absorption, broad bandwidth and thin thickness. The favorable performance could be attributed to the strong magnetic loss, dielectric loss and good impedance matching properties.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Jia Liu,Long Yu,Xiaoyun Yi,Xin Li,Ziqing Liu,He Wang,Linwei Yang,Xin Yang,Suhua Wang
Low-dimensional lead-free Mn(II)-based organic–inorganic metal halides (OIMHs) are promising luminescent materials, yet molecular-level fine-tuning of organic structures to achieve high quantum yield and functional red-light emission remains challenging. In this study, three Mn(II)-based OIMHs were designed and synthesized using aminomethyl-pyridine isomers as cations. The results show that when 3-(aminomethyl)pyridine (3-AMPY) is employed as the organic ligand, its π-conjugated framework and enhanced molecular polarity facilitate the formation of a highly ordered and rigid zero-dimensional octahedral hybrid architecture, which achieves a high photoluminescence quantum yield (PLQY) of 63.42% with bright orange-red emission at 614 nm. In contrast, 2-AMPY and 4-AMPY counterparts only demonstrate weak red emission with low PLQY of 14.05% and 9.23%, respectively. Notably, (4-AMPY)4Mn3Br15 exhibits sensitive and irreversible red-to-green emission switching upon thermal treatment due to phase transition. To leverage this thermoresponsive luminescence behavior, a heating-assisted digital encryption system has been developed for complex information. This work reveals how cation substitution regulates the OIMH structure–property relationship and enriches the family of lead-free metal halides for anti-counterfeiting, information security, and optoelectronic applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hao Zhang,Botao Fan,Rui Li,Qinghu Tang,Futing Xia,Wenhao Fang
The electrocatalytic 5-hydroxymethylfurfural oxidation reaction (HMFOR) has become a clean and fast-response route for synthesizing the sustainable biomonomer. Here, a Mn-doped Ni(OH) 2 catalyst is constructed and enables a 98.9 % yield of 2,5-furandicarboxylic acid and a 99 % Faradic efficiency with a stable durability up to 50 cycles for the alkaline HMFOR. The Mn-Ni(OH) 2 catalyst shows a low onset potential of ca. 1.29 V ( vs. reversible hydrogen electrode, RHE) and achieves a current density of 50 mA cm −2 at only 1.38 V in 1 M KOH, significantly outperforming the vast majority of Ni-based (oxy)hydroxide catalysts reported to date in the literature. The isomorphic substitution of Ni 2+ ions by the coordination unsaturated Mn ions brings about lattice expansions and crystal defects of the nanoflower-shaped Ni(OH) 2 catalyst. The distinctive Mn-doping effect can modulate the electronic structure and also oxygen vacancy formation on Ni(OH) 2 surface. The experimental and theoretical studies systematically unravel that the ingenious catalytic synergism can significantly boost the proton deintercalation feature of Ni(OH) 2 ( i.e. , an improved generation kinetics of the Ni 3+ (OH)O active center) and dramatically promote the adsorption ability of different reactive intermediates on Ni 3+ (OH)O. As a result, HMFOR is greatly enhanced on the as-prepared Mn-Ni(OH) 2 catalyst. The mechanism investigations further evidence that the activation processes of CH 2 OH and HC O groups during HMFOR must require the participations of OH − ions and H 2 O molecules, respectively. This work has clearly tracked the reconstruction process of a Ni electrocatalyst and firstly unlocked the activation behaviors of different functional groups, thus successfully getting deep insights into the real and dynamic catalytic mechanism for the alkaline HMFOR.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120336
·
IF 7.2
Ganchen Zhou,Zhiqiang Chen,Xiaoying Jin,Zhibiao Chen,Zuliang Chen
Rare earth elements (REEs) have emerged as critical metallic resources in modern industries due to their unique physicochemical properties. However, rare earth elements are inevitably discharged into environments during mining operations, leading to impact the ecosystem and to loss rare earth elements. To address this, the carbonized Fe/Mn nanomaterials (C-Fe/Mn) were synthesized through green carbothermal reduction to achieve efficient recovery of rare earth elements. It can be seen that the maximum adsorption efficiencies of REEs by synthesized material were yttrium (Y(Ⅲ) 98.28 %), lanthanum (La(Ⅲ) 97.37 %), dysprosium (Dy(Ⅲ) 88.75 %), and ytterbium (Yb(Ⅲ) 77.27 %), respectively. Through advanced characterization, C-Fe/Mn's magnetic properties have been confirmed, which enables direct recovery from wastewater and easy separation in application. The results showed that the carbon coating provides additional active sites, thereby enhancing its adsorption capacity, while the presence of zerovalent iron lattice improves its stability. Therefore, its efficient adsorption of rare earth elements is mainly attributed to the combined effect of complexation and electrostatic force. Finally, column experiments demonstrated that rare earth elements can be effectively removed and desorbed by C-Fe/Mn under continuous flow, indicating its potential for practical application. Overall, this approach not only mitigates environmental pollution but also promotes resource recycling, offering dual economic and ecological benefits.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Zhuoyue Li,Zhenlong Cheng,Maoxiu Huang,Qingkai Chen,Yuanli Liu,Zhiyi He,Jun Ou
In this paper, highly fluorescent, structurally homogeneous, and small-sized NaYF 4 upconversion nanoparticles were synthesized via the hydrothermal method, Yb/Ho/Mn co-doping altered the local symmetry of the crystals, slightly deforming their structure and enhancing the fluorescence intensity of the nanocrystals. The strong green light emission from the synthesized samples was mechanistically explained by energy transfer upconversion combined with excited state absorption process involving Yb-Mn dimers. The highest fluorescence intensity was observed with 15 mol% Mn 2+ , which increased the fluorescence intensity by a factor of approximately 10.88 compared to the undoped sample. Furthermore, this work explored the optical temperature-sensing properties of these upconversion fluorescent nanocrystals for non-contact temperature measurement, leveraging thermal and non-thermal coupling mechanisms. It provided a promising strategy for developing high-performance optical temperature sensors using other transition metal-doped lanthanide materials.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Haishuo Wang,Xinke Tian,Zhichun Li,Jie Zhang,Shiyin Li,Heyong Huang
Lake eutrophication leads to the excessive proliferation of cyanobacteria in aquatic environments, resulting in microcystin-LR (MCLR) concentrations exceeding regulatory limits. The associated environmental risks and health concerns attract widespread attention. As one of the most active chemical substances in aquatic environments, dissolved organic matter (DOM) plays a critical role in the phototransformation of MCLR. In environments where Fe(II) and Mn(II) coexist, the phototransformation process of MCLR may be influenced. Among fulvic acid (FA), humic acid (HA), cyanobacteria-derived DOM (CDOM), and reed leaf-derived DOM (RDOM), FA has the highest apparent reaction rate constant for MCLR at 0.03567 h -1 . Using isopropanol, furfuryl alcohol, and sorbic acid as quenchers, the contributions of different photochemically produced reactive intermediates(PPRIs) to MCLR photodegradation follow the order: 3 DOM⁎ > ·OH > 1 O 2 . As pH increases, changes in the conformation and charge distribution of DOM and MCLR suppress MCLR photodegradation. The addition of Fe(II) or Mn(II) enhances the photodegradation of MCLR by DOM. Electron paramagnetic resonance tests and radical quenching experiments indicate that the introduction of Fe(II)/Mn(II) increases ·OH production. The enhanced ·OH promotes MCLR photodegradation more effectively than the suppression caused by Fe(II)/Mn(II) quenching of ³DOM⁎. Product analysis reveals that demethylation, hydroxylation, decarbonylation, decarboxylation, denitration, and bond cleavage are the main pathways of MCLR photodegradation. These findings provide valuable insights into the migration and transformation of MCLR in complex environments, contributing to a deeper understanding of the fate of pollutants in natural water systems, particularly in the presence of metal ions.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Baicheng Yuan,Xinyi Huang,Shaojinlin Yang,Yi Yang,Zhihong Lin,Raphael Semiat,J. Paul Chen
Heavy metal contamination has become one of the greatest global environmental problems. In this study, a magnetic calcium-alginate hydrogel-sphere encapsulated with Fe–Mn–Zr ternary-metal composite (MCHETC) was prepared through a combined co-precipitation and extrusion approach and used for the adsorption of heavy metals in aqueous solutions. The active sites were dispersed in the MCHETC, which can be separated by the magnetic force for the ease in operation. Above 80% of ultimate adsorption was completed at a contact time of 5 h. The copper uptake history was well described by the intraparticle surface diffusion model, suggesting a multi-step process for the adsorption. The optimum pH for adsorption was 4; the maximum adsorption capacity was 103.1 mg-Cu/g. The adsorption capability well remained after the 5 adsorption–desorption cycles and the copper could be recovered. Furthermore, the adsorbent performed well in the nature water spiked with copper ions. The mechanism studies illustrated that the adsorption was mainly controlled by the ion-exchange reaction. This study demonstrated that the MCHETC adsorption technology may be used for heavy metal removal and recovery with higher efficacy.
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