SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Hugang Li,Yongfei Gao,Hongxu Chen,Hui Zhou,Yuhong Qin,Shuai Niu
Addressing the challenges associated with phosphorus and arsenic coexistence is not only a scientific necessity but also a practical imperative for the growing importance of sustainable sewage sludge management. This study investigates the speciation and crystallization transformations of phosphorus and arsenic in sewage sludge under Fe(III)-catalyzed hydrothermal treatments with pH ranging from 2.5 to 8.5. Arsenic and phosphorus, both belonging to the same group of the periodic table, exhibit dynamic interactions during Fe(III)-catalyzed hydrothermal treatments. Results reveal that hydrochar yield decreases with lower pH, while the proportion of arsenic(V) in hydrochar decreases with increasing calcium ion concentration. Scanning electron microscopy shows that fibrous and needle-like structures on hydrochar surfaces enhance the adsorption and enrichment of dissolved phosphorus and arsenate, forming vivianite-P and vivianite-like mineral phases. Notably, the crystallization of scorodite (FeAsO 4 ·2H 2 O) facilitates the immobilization of As(III) in near-neutral environments. These findings deepen our understanding of the synergistic morphological processes and crystallization transformations of arsenic and phosphorus during Fe(III)-catalyzed hydrothermal treatments, offering significant implications for P-rich biochar fertilization and application.
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2011
·Vol. 14
·期 1
·130-135
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IF 5.472
Bin Li,An-Hua Liu,Liang-Nian He,Zhen-Zhen Yang,Jian Gao,Kai-Hong Chen
Readily available iron compounds were found to be active catalysts for the selective oxidation of sulfide to sulfoxide with molecular oxygen as the oxidant in polyethylene glycol (PEG). As an indispensable component, PEG had a great promotive effect on the reaction. Notably, high conversion (>99%) along with excellent chemo-selectivity of up to 94% could be attained by using Fe(acac)2 as the catalyst at 100 °C. This methodology was proved to be applicable for the transformation of various aromatic and aliphatic sulfides into the corresponding sulfoxides with high selectivity. PEG is considered to play a crucial role in stablizing the Fe(IV)-oxo species formed in situ which is supposed to be responsible for the sulfide oxidation.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 6
·948
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IF 3.9
Rui Hu,Tianye Wang,Yifan Wang,Yuan Zhu,Li Xie,Enhui Xing,Yu Wu,Zhijian Da
A nano-hollow zeolite-encapsulating ultra-fine Fe nanoparticle catalyst denoted as Fe@n-hS-HT was successfully synthesized through a simple water steam treatment of the Fe@n-hS catalyst prepared by the “dissolution–recrystallization” (D-R) method. The Fe@n-hS-HT catalyst had a hierarchical porous structure and a high dispersion of Fe2O3particles with a size of 3.4 nm. Furthermore, the results of several characterization methods, such as XRD, HAADF-STEM, and H2-TPR, further demonstrated the transformation of the skeleton Fe in Fe@n-hS into Fe2O3, which was uniformly dispersed in the Fe@n-hS-HT catalyst. Meanwhile, Fe@n-hS-HT had significantly higher selectivity and yield of C2-C4=than the reference catalysts Fe/S and Fe@n-hS, which provided strong proof for the confined catalysis of the metal@zeolite catalyst.Keywords:hollow zeolite;Fischer–Tropsch synthesis;encapsulation;iron catalyst
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
ChemSusChem
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2016
·Vol. 9
·期 11
·1339-1347
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IF 7.116
Jiang Li,Jun-ling Liu,Hong-jun Zhou,Yao Fu
Graphical FF to FFA with Fe : Efficient catalytic transfer hydrogenation of furfural (FF) to furfuryl alcohol (FFA) over heterogeneous iron catalysts is demonstrated for the first time. Iron cations coordinated by pyridinic nitrogen functionalities on the carbon support are possibly responsible for the enhanced catalytic activity. This paves the way for achieving biomass conversion through heterogeneous iron catalysis. Iron-based heterogeneous catalysts, which were generally prepared by pyrolysis of iron complexes on supports at elevated temperature, were found to be capable of catalyzing the transfer hydrogenation of furfural (FF) to furfuryl alcohol (FFA). The effects of metal precursor, nitrogen precursor, pyrolysis temperature, and support on catalytic performance were examined thoroughly, and a comprehensive study of the reaction parameters was also performed. The highest selectivity of FFA reached 83.0 % with a FF conversion of 91.6 % under the optimal reaction condition. Catalyst characterization suggested that iron cations coordinated by pyridinic nitrogen functionalities were responsible for the enhanced catalytic activity. The iron catalyst could be recycled without significant loss of catalytic activity for five runs, and the destruction of the nitrogen–iron species, the presence of crystallized Fe 2 O 3 phase, and the pore structure change were the main reasons for catalyst deactivation.
研究领域:
化学工程
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催化科学
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生物质转化
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Luya Shen,Haoyang Li,Xi Yang,Shaoyuan Li,Yuelong Yu,Jijun Lu,Fengshuo Xi,Wenhui Ma,Rong Deng
The environmentally friendly recycling of end-of-life (EoL) photovoltaic modules is a crucial pathway to achieving “carbon neutrality.” However, currently, most efforts are primarily focused on the recovery of valuable metals, neglecting the utilization of TPT (Tedlar/PET/Tedlar) plastic backsheet. This work develops a two-stage pyrolysis process for TPT decomposition and which can convert into high-value nanocarbon materials and hydrogen under the catalysis of Ni and Fe nanometal particles. The pyrolysis behavior of TPT backplates was systematically investigated, the gas chromatography results reveal that the pyrolysis products primarily consisted of CO 2 , CO, CH 4 , CH 3 CHO, and other small molecules, alongside sizeable residual compounds under the catalytic degradation process. The resulting hydrocarbons play an important role as carbon sources in the formation of carbon nanomaterials and hydrogen generation. The study thoroughly discusses the effects of different catalyst on pyrolysis gas species and components, fixed carbon content, and nanocarbon morphology. Molecular dynamics simulations based on the reactive force field (ReaxFF) was performed to analyze the pyrolysis products. Finally, a gas–liquid-solid physical model was proposed to interpret the growth process of the carbon nanomaterials under Ni-Fe nanometallic catalysis.
研究领域:
环境科学
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材料科学
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能源科学
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产品关联
DOI
高影响因子
Macromolecular Reaction Engineering
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2023
·Vol. 17
·期 3
·2300013
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IF 1.5
Ying Zhang,Jian Ye,Yinzhi Jiang,Shuqin Jiang,Wei Xiao,Dongchu Wei
The bis(imino)pyridyl iron-based ethylene oligomerization catalysts have the advantages of mild reaction conditions, high activity and high selectivity to linear α -olefins. However, barriers, such as high polymer content in the product mixture and large methylaluminoxane (MAO) dosage, are still limitations for the development of these systems at the industrial scale. In this study, new cocatalysts are prepared by the reaction of alkylaluminums with urea and its derivatives, and successfully used to activate iron-based catalysts. It is found that the type and molar ratio of alkylaluminum and urea have significant influence on the performance of the cocatalysts. The activity of the preferred triisobutylaluminum/urea activated systems reaches more than 3.0 × 10 8 g (mol-Fe) −1 h −1 , and the polymer content can be controlled to be less than 2 wt.%. Notably, the catalytic system exhibits good high temperature stability, the activity can still reach 1.0 × 10 8 g (mol-Fe) −1 h −1 even at 120 °C. Further 1 H NMR studies show that alkylaluminum can react with the N H moieties of urea, forming complex alkylaluminum clusters, even aluminoxane-like structures. This study offers a promising family of cocatalysts, making it possible to simultaneously improve their performance and reduce their cost.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2021
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IF 4.354
Yan-Ling Song,Bei Li,Zhen-Biao Xie,Dan Wang,Hong-Mei Sun
Iron-catalyzed oxidative amination of benzylic C(sp3)–H bonds with anilines bearing electron-withdrawing groups (EWGs) or electron-donating groups (EDGs) is realized based on simple variations of N-substituents on imidazolium cations in novel ionic Fe(III) complexes. The structural modification of the imidazolium cation resulted in regulation of the redox potential and the catalytic performance of the iron metal center. Using DTBP as oxidant, [HItBu][FeBr4] showed the highest catalytic activity for anilines bearing EWGs, while [HIPym][FeBr4] was more efficient for EDG-substituted anilines. This work provides alternative access to benzylamines with the advantages of both a wide substrate scope and iron catalysis.
研究领域:
有机化学
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催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2019
·
IF 4.745
Na Li,Jinku Bai,Xiaolin Zheng,Honghua Rao
An iron-catalyzed methylene forming strategy is disclosed through sequential C–H and C–O bond functionalization of methanol with cosolvent water. This protocol provides an easy and novel access to methylene-tethered imidazo[1,2-a]pyridine and 2-aminopyridine analogues in a sustainable manner and represents a complementary approach to traditional methylene forming strategies.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
Molecular Catalysis
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2025
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IF 4.9
Jiaqi Feng,Wenwen Zhang,Kai Zhang,Hongyu Wang,Changcheng Wu,Jingde Li
NiFe-based materials offer tailorable electronic structure and exhibit promising performance in alkaline hydrogen evolution reaction (HER). Electron-rich earth metals as doping species can regulate the local electronic configuration of NiFe-based catalysts towards improved HER activity. Herein, a low electronegative Mg dopant strategy is utilized to prepare Mg-FeOOH/NiFeO x electrocatalyst for HER. The introduction of Mg improves the bonding strength of Fe-O bond in FeOOH active species, resulting in rapid H 2 O dissociation and improved stability. Meanwhile, Mg-dopant induces a downshift in the d -band center of FeOOH, which weakens the hydrogen adsorption for promoted H 2 production. The Mg-FeOOH/NiFeO x catalyst shows an ultra-low HER overpotential of 18 mV at 10 mA cm -2 and excellent stability in 1.0 M KOH. Moreover, the anion-exchange membrane water electrolyzer reaches 500 mA cm -2 at 1.70 V. This study provides a practical strategy to synthesise high-efficiency NiFe-based HER catalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2025
·
IF 9.5
Gouda Helal,Zhenhang Xu,Wei Zuo,Jun Qian,Gongzhen Cheng,Pingping Zhao
Transition metal-based electrocatalysts undergo electrochemical surface reconstruction to generate metal oxy-hydroxide-based hybrids, which regard the actual active sites for the oxygen evolution reaction (OER). Many efforts have been devoted to understanding the electrochemical surface reconstruction, but there is rare research to identify the origin of improved OER performance derived from the substrate. Herein, we reported the electrochemical synthesis of an amorphous γ-NiOOH surface layer on NiFealloy/NiFeN pre-catalysts for efficient water oxidation. However, the conversion of β-NiOOH to γ-NiOOH is a thermodynamically unfavorable process, resulting in much higher applied potential to drive the reaction and subsequently catalyze OER.We identified that the NiFe-bimetallic active sites can promote the OER catalytic activity more than the Ni-monometallic active sites. Besides, nitrogen can reduce the potential required to generate γ-NiOOH OER-active sites from β-NiOOH and generate the NO3- anion, which promotes the formation of γ-NiOOH. The electrochemical analysis and in situ spectroscopic approaches, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), and Raman, reveal that Ni species in NiFealloy/NiFeN are more thermodynamically favorable to form γ-NiOOH than in Nialloy/NiN and NiFeLDH. Beside the electrochemical behavior, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and bode plots further demonstrate that Fe doping and nitrogen significantly increase the electrochemically active sites. Additionally, DFT calculation results show that the electronic structure of the catalysts is modulated by Fe doping, and the surface reconstruction optimized the adsorption energy of oxygen-containing species and enhanced the OER catalytic activity. This work provides a new design for constructing transition metal-based electrocatalysts for water oxidation.
研究领域:
电化学
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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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Wentao Li,Kezhen Qian,Zixu Yang,Xiaoxu Ding,Wenmin Tian,Dezhen Chen
Microwave-initiated deconstruction of plastic into hydrogen and high-value carbons is an attractive upcycling technology. However, the interplay between microwave field and catalyst material and the reaction mechanism were not fully understood. In this study, Co doping Fe-Al catalysts were synthesized for hydrogen production from LDPE using microwave and conventional heating. The Fe1Co1Al2 catalyst yielded hydrogen at 61.39 mmol/g plastic under microwave, which was almost two times higher than conventional heating. Characterization indicated Co doped spinel iron catalyst under microwave rapidly transformed into the highly active FeCo alloy for plastic dehydrogenation . The microwave field was responsible for the rapid formation of FeCo, as it enhanced the charge transfer from H to Fe. The Co doping also inhibited the formation of Fe 3 C during plastic deconstruction, which changed the carbon diffusion pathway and promoted the formation of nanotubes and hydrogen production.
研究领域:
化学工程
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材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
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2024
·
IF 6.7
Xiaoyu Gong,Jiawei Ge,Jun Qi,Honghe Ding,Leijie Zhang,Peiyu Ma,Zuohuan Chen,Nian Zhang,Jilong Xu,Lijuan Zhu,Jiaxiang Lu,Guiqiang Li,Junjie Ge,Yifan Ye
Advancing the performance of NiFe catalytic systems for oxygen evolution reaction (OER) is challenging, notably upon incorporating a third transition metal to create a trimetallic configuration. This study introduces a Cu-doped NiFe electrocatalyst, synthesized via a streamlined redeposition technique. The catalyst exhibits a Tafel slope of 38 mV dec −1 and a low overpotential of 248 mV at a current density of 100 mA cm −2 , plus a 2.5-fold boost in intrinsic activity. Density Functional Theory (DFT) and spectroscopic analyses demonstrate that Cu doping refines the electronic structure, enhancing charge density around the Fermi level and multiplying active OER sites. The Cu1Fe6Ni18 catalyst features robust Cu–O and Fe–O bond interactions, enhancing charge transport and OER kinetics. Our research elucidates the synergistic effects of Cu and Fe in a trimetallic system, offering an impactful approach to elevate trimetallic catalyst performance.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
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