APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Linkai Wang,Yu Han,Jian Wei,Qingjie Ge,Shijian Lu,Yanpeng Mao,Jian Sun
Hydrogenation of CO 2 into light olefins is an important route to carbon neutrality . Most of traditional researches focus on the catalyst component, structure, and promoter to enhance the selectivity of light olefins while ignoring the diffusion of products. Here, we report a NaFeZr-MOR composite catalyst for light olefin synthesis in CO 2 hydrogenation via pore confinement. The selectivity in hydrocarbons and STY (Space-time yields) of C 2–4 = is gradually increasing maximum up to 51.3% and 12.2 (mmol·g cat −1 . h −1 ), which lie in a high level among reported Fe-based catalysts. Further characterization revealed that the essence of selectivity change period is the accumulation and evolution of carbonaceous species, which causes the change of product diffusion behavior. It suppresses the escape of heavy hydrocarbons from MOR pores, leading to an increased light olefin, especially ethylene, which is called “dynamic confinement”. These findings provide a new insight for controlling low-carbon product selectivity in CO 2 hydrogenation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Wentao Shang,Zijun Dong,Mu Li,Xiulan Song,Miao Zhang,Chengchun Jiang,Sun Feiyun
As a type of iodinated contrast medium (ICM), the diatrizoate (DTZ) found in aquatic systems has posed a serious threat to the ecosystem and to human health. In this study, Fe(II)-activated persulfate (Fe 2+ /PS) oxidation was employed to degrade DTZ, and the optimal operating conditions were determined. Electron paramagnetic resonance (EPR) spectra and density functional theory (DFT) calculations were adopted to determine the dominant radicals and analyze the degradation paths, respectively. It was found that a PS concentration of 10 mmol/L, an n(Fe 2+ )/n(PS) ratio of 1:10, an initial pH of 3.0, and a high temperature increased the degradation efficiency of DTZ. After suppression of the oxidation process by tertiary butyl alcohol (TBA) and methanol (MtOH), the EPR spectra demonstrated that DTZ degradation was attributed to the combined effects of SO 4 − and OH and that OH played a more important role. Based on the theoretical calculation and comparison of the reduction energies of possible degradation products, the path from DTZ to TP630 and then to TP628 and finally to TP602 was recognized as the main DTZ degradation pathway during the Fe 2+ /PS oxidation process. These findings validated and demonstrated that DTZ could be effectively degraded by Fe 2+ /PS oxidation, which is a promising approach to remove DTZ from water.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Hui-Ran Jin,Xin-Yu Zhou,Yong Zhu,Guo-Fan Sun,Shi-Jie Ding,Jing Chen
In this paper, non-aqueous Fe(OH) 3 /palygorskite dispersion was prepared and its liquid crystal phase behavior was investigated. Positively charged Fe(OH) 3 colloidal particles were put in to non-aqueous and organically modified palygorskite dispersion. The effects of organically treated palygorskite and Fe(OH) 3 on the preparation of stable palygorskite dispersion were characterized with FT-IR, XRD , Contact Angle measurement , Zeta potential detection, Settlement measurement and SEM , respectively. The addition of Fe(OH) 3 particles shifted the concentrations of the coexisting isotropic and nematic phases to higher values while at the same time markedly accelerated the phase separation. The influence of Fe(OH) 3 particles on the dispersion in magnetic field was also discussed.
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Xuelong Zhou,Liyu Lin,Yunhui Lv,Xiangyang Zhang,Qixing Wu
Hybrid flow batteries are one of the most promising technologies for storing the electricity generated from intermittent renewables , such as wind and solar. However, most of the existing hybrid systems currently suffer from low power density and poor cycle performance resulted from the parasitic reactions. To mitigate these issues, here we report a tin-iron hybrid flow battery in which the stannous chloride anolyte is separated from the ferric/ferrous chloride catholyte. With the reversible tin metal deposition/stripping and ferric/ferrous chloride redox reactions at carbon surfaces , the present battery delivers an energy efficiency of 78.5% even at the current density of 200 mA cm −2 . In addition, owing to high hydrogen overvoltage of metallic tin, the parasitic hydrogen evolution reaction in the negative electrode can be largely avoided so that the battery can stably operate over 700 cycles without obvious efficiency decay. With the excellent rate and cycle performance, it is envisioned that the tin-iron flow battery is a promising candidate for large-scale energy storage applications .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shenghua Chen,Wenhai Chu,Hongbin Wei,Hongying Zhao,Bin Xu,Naiyun Gao,Daqiang Yin
Haloacetamides (HAcAms), a class of highly toxic nitrogenous disinfection by-products (N-DBPs), have been widely detected in drinking water . The control of DBPs is an important measure to ensure the safety of drinking water. Due to the presence of residual chlorine and organic compounds that failed to be effectively removed, HAcAms could be formed in the finished drinking water distribution systems. In the study, Cu/Fe bimetal with different molar ratios of Cu to Fe was synthesized. This study reported that Cu/Fe bimetal reduced trichloroacetamide (TCAcAm) to dichloroacetamide (DCAcAm) and monoacetamide (MCAcAm), and the reduction ability of Fe was greatly improved due to the incorporation of Cu. The optimal HAcAm removal was achieved when the molar ratio of Cu to Fe was 2.0%, Cu/Fe bimetal could reach complete degradation of TCAcAm within 1 h. With the increase of Cu/Fe bimetal dose or the decrease of solution pH, the reduction ability of Cu/Fe bimetal for HAcAm removal also increased. The calculated integrated toxicity values from HAcAms, which was used to reflect the comprehensive control effect of Cu/Fe bimetal for HAcAms, were also reduced with the decrease of solution pH and the increase of bimetal dose. The release of Cu 2+ was not detected during the whole treatment process, Cu/Fe bimetal may be an excellent material for controlling DBPs as the end – control methods in tap water.
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高影响因子
Biomed Research International
·
2015
·
IF 1.579
Yan Ma,Kejia Zhang,Cong Li,Tuqiao Zhang,Naiyun Gao
The photocatalytic degradation of sulfonamides in aqueous TiO2 suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2016
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IF 2.208
Cancan Xu,Rui Liu,Lvjun Chen,Jialu Tang
Ni/Fe-Fe 3 O 4 nanocomposites were synthesized for dechlorination of 2,4-dichlorophenol (2,4-DCP). The effects of the Ni content in Ni/Fe-Fe 3 O 4 nanocomposites, solution pH, and common dissolved ions on the dechlorination efficiency were investigated, in addition to the reusability of the nanocomposites. The results showed that increasing content of Ni in Ni/Fe–Fe 3 O 4 nanocomposites, from 1 to 5 wt.%, greatly increased the dechlorination efficiency; the Ni/Fe–Fe 3 O 4 nanocomposites had much higher dechlorination efficiency than bare Ni/Fe nanoparticles . Ni content of 5 wt.% and initial pH below 6.0 was found to be the optimal conditions for the catalytic dechlorination of 2,4-DCP. Both 2,4-DCP and the intermediate product 2-chlorophenol (2-CP) were completely removed, and the concentration of the final product phenol was close to the theoretical phenol production from complete dechlorination of 20 mg/L of 2,4-DCP, after 3 hr reaction at initial pH value of 6.0, 3 g/L Ni/Fe-Fe 3 O 4 , 5 wt.% Ni content in the composite, and temperature of 22°C. 2,4-DCP dechlorination was enhanced by Cl − and inhibited by NO 3 − and SO 4 2 − . The nanocomposites were easily separated from the solution by an applied magnetic field. When the catalyst was reused, the removal efficiency of 2,4-DCP was almost 100% for the first seven uses, and gradually decreased to 75% in cycles 8–10. Therefore, the Ni/Fe–Fe 3 O 4 nanocomposites can be considered as a potentially effective tool for remediation of pollution by 2,4-DCP.
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PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 10
·5621-5627
·
IF 3.108
Shan Huang,Kai-Li Yang,Xiao-Fang Liu,Hu Pan,Heng Zhang,Song Yang
MIL-100(Fe) was used for the first time in the catalytic transformation of hexose sugars into lactic acid (LA). The as-synthesized MIL-100(Fe) was systematically characterized, and its superior morphological and textural properties were demonstrated to contribute greatly to the pronounced catalytic performance in fructose-to-LA conversion (up to 32% yield), as compared with other catalysts like Cu-BTC and MIL-100(Cr). The effects of reaction conditions including temperature, reaction time, and substrate loading were explored. In addition, MIL-100(Fe) could be easily reused for 4 cycles with no evident decrease in catalytic activity.
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Nanoscale
·
2017
·Vol. 9
·期 31
·11126-11136
·
IF 7.367
He Liu,Haitao Zhang,Linfeng Fei,Hongbin Ma,Guoying Zhao,CheeLeung Mak,Xixiang Zhang,Suojiang Zhang
Fe-doped HTaWO6 (H1−3xFexTaWO6, x = 0.23) nanotubes as highly active solid acid catalysts were prepared via an exfoliation–scrolling–exchange process. The specific surface area and pore volume of undoped nanotubes (20.8 m2 g−1, 0.057 cm3 g−1) were remarkably enhanced through Fe3+ ion-exchange (>100 m2 g−1, 0.547 cm3 g−1). Doping Fe ions into the nanotubes endowed them with improved thermal stability due to the stronger interaction between the intercalated Fe3+ ions and the host layers. This interaction also facilitated the preservation of effective Brønsted acid sites and the generation of new acid sites. The integration of these functional roles resulted in Fe-doped nanotubes with high acidic catalytic activities in the Friedel–Crafts alkylation of anisole and the esterification of acetic acid. Facile accessibility to active sites, generation of effective Brønsted acid sites, high stability of the tubular structure and strong acid sites were found to synergistically contribute to the excellent acidic catalytic efficiency. Additionally, the activity of cycled nanocatalysts can be easily recovered through annealing treatment.
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PubMed
高影响因子
E-POLYMERS
·
2015
·Vol. 16
·期 1
·41-47
·
IF 0.569
Xue-Hui Zhan
The initiators for continuous activator regeneration (ICAR) atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) were investigated in microemulsion under light irradiation with ethyl 2-bromoisbutyrate (EBiB) as an ATRP initiator, ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as a catalyst, N,N,N′,N′-tetramethyl-1,2-ethanediamine (TMEDA) as a ligand, and azobisisobutyronitrile (AIBN) as an initiator and reducing agent. The linear dependence of ln([M] 0 /[M]) on polymerization time was observed, indicating that the polymerization was living polymerization. Furthermore, the number-average molecular weights (Mn), gel permeation chromatography (GPC) and molecular weight distributions (MWD) of the PMMA obtained from GPC were controlled. The product was characterized by 1 H nuclear magnetic resonance (NMR) and GPC. The living features were verified by chain-extended with MMA with the obtained PMMA as macroinitiator.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Xu Pengfei,Ma Haiming,Shen Wenjuan,Quan Fengjiao,Li Jianfen,He Yun
Ammonia (NH 3 ) can be used as a fertilizer, a chemical or a new generation of fuel and has important agricultural and industrial value. Electrochemical NO 3 – -to-NH 3 (NITRR) can realize the conversion of waste into treasure and waste resources, which is a promising method for ammonia synthesis. However, the process of NITRR is very complicated, resulting in product diversification and poor selectivity. In this work, an iron modified cerium oxide in rod form (Fe/CeO 2 -rod) catalysts was designed and used for the NITRR. The Fe/CeO 2 -rod catalyst showed excellent activity, and achieves high Faradaic efficiency (FE 95%) and NH 3 yield rate (4.04 mg h –1 cm –2 ) in 0.1 M KOH electrolyte at – 0.52 V versus reversible hydrogen electrode. Furthermore, this catalyst exhibits a negligible activity decay during continuous electrolysis for 25 h. Further experiments provide the important role of Fe, which promote the formation of hydrogen radicals (H*). This study may provide new pathways to improve the activity of inexpensive catalysts for NITRR. Graphical Abstract
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Materials Today Communications
·
2024
·
IF 3.7
Hao Liu,Qiang Chen,Sufeng Chen,Jie Li,Qianqian Gu,Meifang Liu
Doped polymer spheres are essential for preparing targets for the inertial confined fusion (ICF) experiments since they can provide important information about the implosion. To prepare Fe-doped polystyrene (PS) spheres, ferrocene-doped PS spheres were successfully prepared by a straightforward method combining physical doping and microfluidic technology. The effect of ferrocene on the quality of the PS spheres was investigated and the relevant mechanism was discussed. Due to the compatibility of PS, ferrocene and fluorobenzene, the Fe-doped polystyrene spheres exhibited good monodispersity, sphericity and surface finish when the ferrocene content in the oil phase solution was lower than 3 %. These properties can meet stringent design requirements for ICF. This study provides valuable insights for the preparation of doped polymer spheres for ICF experiments.
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危险品化学品经营许可证（带存储）