Molecular Catalysis
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2022
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IF 5.089
Zhengting Xiao,Qingyang Li,Wentai Wang,Guangci Li,Guannan Lin,Xuebing Li,Song Chen
A Co-Mo sulfide catalyst with tube-like structure was prepared through a low-temperature pre-sulfurization process using rod-like CoMoO 4 as the precursor. The pre-sulfurization temperature greatly affected the total pore volume, the concentration of CoMoS species, the microstructure of (Co)MoS 2 slabs and the catalytic desulfurization activity. The increased temperature can promote the formation of hollow structure and the sulfurization degree of the precursor. It was found that the excessive temperature induced the Co atoms to form more isolated Co 9 S 8 species, hindering the formation of highly active CoMoS species. Therefore, appropriate temperature is more favorable to form the (Co)MoS 2 slabs with shorter length and higher stacking number, leading to more coordinatively unsaturated sites, especially the corner sites. According to the results of hydrodesulfurization reaction, the reaction rate of dibenzothiophene and the yields of liquid products are highly depended on the number of surface-active sites, which are mainly originated from the Type II CoMoS species. Moreover, the extended pre-sulfurization time can further improve the catalytic desulfurization activity of the catalyst at an appropriate pre-sulfurization temperature.
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高影响因子
FUEL
·
2022
·
IF 8.035
Minghao Zhou,Yaqi Xue,Fei Ge,Jing Li,Haihong Xia,Junming Xu,Jun Zhao,Changzhou Chen,Jianchun Jiang
MOF-derived Ni-based bimetallic catalysts were found to be effective for the in-situ hydrogenation/hydrodeoxygenation of lignin-derived monophenols and dimers with isopropanol as the hydrogen-donor solvent (without external hydrogen). The synergistic effects of bimetallic catalysts were studied, and their catalytic properties afforded the best conversion rate of phenols and cyclohexanol/cycloalkane yields. The detailed physicochemical characterization was conducted by means of XRD, H 2 -TPR, NH 3 -TPD, and pyridine-IR analysis. The effects of reaction temperature (200–260 ℃) and reaction time (2–5 h) on the performance of lignin-derived monophenols and dimers were investigated. During the in-situ hydrogenation/hydrodeoxygenation of lignin-derived phenols, the steric effects and the effects of various functional groups, notably methoxy groups, were investigated. In-situ conversion of lignin-derived phenols with isopropanol was achieved over different Ni/M ratios of NiM@C (M = Co, Mo, and La) catalysts, from which NiLa 0.33 @C produced satisfactory yields of cyclohexanol/cycloalkanes.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9887-9893
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IF 3.3
Yao Tang,Zijun Zou,Xingen Wu,Pengfei Zuo,Lei Wang,Guiwen Huang,Jia Zhu,Shengliang Zhong
Designing highly efficient non-precious metal electrocatalysts to facilitate overall water decomposition is critical and highly desirable, but still challenging. In this study, we synthesized ZIF-67@POM nanomaterials by doping H3PMo12O40 in ZIF-67. The molybdenum-doped carbon matrix can effectively reduce CoP agglomeration, which is conducive to improving the specific surface area and active sites of the catalyst. The doping of Mo also optimizes the electronic structure of Mo-CoP-100 and improves its electrocatalytic activity. Compared with CoP derived from pristine ZIF-67, the optimal Mo-CoP-100 exhibits significantly enhanced oxygen evolution reaction (OER) catalytic activity with an almost constant overpotential of 290 mV to maintain a stable current density of 10 mA cm−2 in alkaline media for at least 100 h. Furthermore, compared with traditional precious metal-free OER electrocatalysts, the Mo-CoP catalysts prepared in this work have high specific surface area, rich surface-active sites, good cycling stability and high diffusion efficiency.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Caijuan Zhong,Shengxiao Zhang,Shuangshuang Yang,Baiqing Yuan,Qiang Xu,Zengrun Xie,Chenyu Du
Mo and N co-doped iron biochar material (Fe/Mo x -NC) was prepared through one-pot calcination method with anhydrous iron chloride, ammonium molybdate, and cherry stone powder as precursors. The composite can effectively catalyze activation of peroxymonosulfate (PMS) for organic pollutants degradation, and the removal rate of 20 mg/L bisphenol A (BPA) reaches 99.08% in 30 min in the presence of 0.1 g/L Fe/Mo 0.1 -NC and 1 g/L PMS. Electrochemical analysis indicates that appropriate doped Mo and N can improve the electron transfer performance of the composite, which enhances the PMS activation property for BPA degradation. Quenching experiments and electron paramagnetic resonance analysis both demonstrated that the Fe/Mo 0.1 -NC/PMS system generated SO 4 •− , •OH and 1 O 2 , which involved in BPA degradation. Moreover, a galvanic oxidation process had shown that there existed nonradical pathway which relied on electron transfer. The degradation pathway is proposed by measuring the intermediate products with HPLC-HRMS/MS. Through the exploration of the reaction mechanism, low-valence molybdenum ions can promote the cycle of Fe 2+ /Fe 3+ , and the pyridine-N and graphitic-N contained in Fe/Mo 0.1 -NC can catalyze activation of PMS together with Fe 2+ . The designed membrane filtration device revealed the feasibility of the composite in dynamic process, which was great significant for actual operation of water treatment. Furthermore, the Fe/Mo 0.1 -NC/PMS system could effectively decompose organic pollutants in the effluent from sewage treatment plant, achieving 82.6% of total organic carbon removal rate. This study not only prepared a novel heteroatom doped Fe-biochar material for PMS activation to degrade organic pollutants, but also deepened the reaction mechanism and explored its applicability for advanced treatment of real wastewater.
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高影响因子
Journal of Water Process Engineering
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2023
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IF 7
Caifeng Wei,Yanqin Cai,Zujin Yang
The presence of heavy metal ions and organic dyes in aqueous solutions has a significant impact on the ecological environment and human health. Herein, a novel bifunctional imidazolium-based porous organic polymer (IMSPF-Br-C=C) was prepared successfully via quaternization reaction of spirobifluorene and 1,4-dibromo-2-butene. The synthesized material was characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), Fourier transform infra-red spectra (FTIR), Thermogravimetric analysis (TGA), X-ray diffraction (XRD), N 2 adsorption-desorption analysis and solid-state 13 C CP/MAS NMR spectroscopy, confirming its structure and stability. Owing to the conjugated structure of spirobifluorene, IMSPF-Br-C=C showed excellent recognition performance for dichromate anion (Cr 2 O 7 2− ) with the limit of detection (LOD) of 1.58 μmol/L. In addition, IMSPF-Br-C=C with the abundant imidazolium cations showed the outstanding adsorption performance in the removal of Cr 2 O 7 2− and methyl orange (MO). Removal efficiencies and adsorption capacities of IMSPF-Br-C=C were 98.3 % and 99.4 %, 452.8 and 1304.2 mg/g in 6 min, respectively. The results show that the electrostatic interactions and π-π stacking play crucial roles in the fluorescence detection of Cr 2 O 7 2− and adsorptive separation of Cr 2 O 7 2− and MO. Furthermore, physico-chemical techniques, density functional theory (DFT) calculation and frontier molecular orbital theory (FMO) were used to explain action mechanism. This work provides a cost-effective IMSPF-Br-C=C as a bifunctional platform for sensing Cr 2 O 7 2− and adsorptive separation of Cr 2 O 7 2− and MO in aqueous solution.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 43
·23270-23277
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IF 11.9
Xiaoyun Zhang,Shifan Zhu,Yixue Xu,Yuqiao Wang
The tip effect of the high curvature tip top can cause electromagnetic effects to improve the catalytic performance. Doping of transition metals (Cr, Fe and Mo) into CoP array nanocones alters the tip curvature of CoP to strengthen the tip effect with increasing curvature. The stronger tip effect of Fe-CoP improves OH− concentration, accelerates surface charge transfer and enhances the electric field for a higher catalytic efficiency. Fast charge transfer and high electronic conductivity are attributed to transition metal doping, which can be confirmed by theoretical simulations and experiments. The optimized d-band centre of Fe-CoP adjusts the appropriate adsorption strength of the reaction intermediates. Fe doping endows CoP with a higher curvature cone structure and optimizes electronic structure for high catalytic activity and reaction kinetics. Tip cone as special sites tuned by transition metal doping provides a strategy for efficient non-noble metal catalysis.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Sainan Liu,Hongtai Shen,Jiawei Xu,Xiaojun Zhou,Jianfei Liu,Zhenyang Cai,Xiaojun Zhao,Lairong Xiao
To develop an ultra-high-temperature resistant coating for a reusable thermal protection system, the preparation of a tantalum-based MoSi 2 -Mo coating by a new two-step process of multi-arc ion plating and halide activated pack cementation is presented. The coating has a dense structure and is well compatible with the tantalum substrate, which can be thermally shocked from room temperature to 1750 °C for 360 cycles without failure. The mechanism of the coating’s excellent resistance to high-temperature thermal shocks is that a strong-binding gradient interface and a dense SiO 2 oxide scale with good oxygen resistance are formed by the high-temperature self-diffusion of Si.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Fekadu Tadesse Bekena,Dong-Hau Kuo,Worku Lakew Kebede
Wastewater treatment becomes an important part to improve environmental quality and protect water resources. Thus, developing a new photocatalyst is a key solution for environmental issues. Herein, universal, highly efficient, and novel Bi 2 (O,S) 3 /Mo(O,S) 2 nanocomposite photocatalyst was fabricated by a facile method and the crystal structure, morphology, composition, and optical properties of the as-prepared catalysts were characterized in details. The photocatalytic performance of the catalysts was evaluated by the photodegradation of methyl orange (MO), rhodamine B (RhB), methylene blue (MB), and neutral red (NR), the results showed that 20% Bi-MoOS nanocomposite had excellent photodegradation activity towards all dyes. 96.0% of MO, 96.6% of RhB, 98.8% of MB and 91.3% of NR dyes were removed after 180 min, 40 min, 20 min, and 25 min visible light irradiation, respectively. The photodegradation of these dyes was further confirmed with HPLC. The excellent photocatalytic activity of the nanocomposites was due to the efficient separation and transport of photogenerated charge carriers induced by the fabricated binary heterostructures. The photodegradation fitted well the pseudo-first-order kinetics. The active species capture experiment study showed that, OH, O 2 − and h + all took parts in the degradation of dyes. The stability of the catalyst and reaction mechanism also explained in this work.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Zhiyu Shao,Jing Sun,Zhen Yan,Keke Huang,Fuli Tian,Hui Xue,Qin Wang
Among the groups of excellent electrode materials reported, Ni-Fe based catalyst is a topic of significant current interest for electrochemical water splitting. Furthermore, hierarchical structures are widely used in heterogeneous catalysis in various catalytic processes. A novel hybrid of Mo-doped Ni 3 Fe/Ni 3 FeN nanocatalyst was designed by using a facile method in this study. The Mo-Ni 3 Fe/Ni 3 FeN catalyst exhibits an outstanding catalytic performance for oxygen evolution reaction, as indicated by an ultralow overpotential of 240 mV at 10 mA·cm −2 and a small Tafel slope of 47 mV·dec −1 . This study provides an idea for the development of new eletrocatalysts with more electron transfer channels and higher electrocatalytic performance.
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高影响因子
Processes
·
2021
·Vol. 9
·期 9
·1487
·
IF 2.847
Muhammad Faizan,Kifayat Ullah Khan Niazi,Hasnain Nawaz,Niaz Muhammad,Hao Li,Fei Dai,Ruirui Zhang,Ruixia Liu,Suojiang Zhang
In recent work, deep eutectic solvents (DESs) as ionic liquid analogues have been abundantly used in catalysis. Herein, vanadium phosphorus oxide (VPO) catalysts were synthesized from mono-, bi-, and tri- metallic DES of Nb, Zr, and Mo metal dopants as structure-directing agents and electronic promoters for n-butane selective oxidation towards maleic anhydride. Higher MA selectivity and larger n-butane conversion was successfully obtained using the newly developed catalysts, while oxidation by-product COx(CO, CO2) was minimized. Characterization techniques including FTIR, DSC, XRD, TEM, SEM, EDS, Raman spectroscopy, TGA, XPS, and NH3-TPD were employed to fully characterize the DESs, precursors and catalysts. This work led to an increase of 7.8% in MA mass yield with 16% more n-butane conversion as compared to an unpromoted VPO catalyst. Moreover, the utilization of a low-carbon alkane brought in a green impact on the chemical plant as well as the environment.Keywords:deep eutectic solvent;vanadium phosphorus oxide;n-butane selective oxidation;structure directing agent;electronic promoter
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingsheng Hu,Qizhao Wang,Yan Li,Yan Meng,Lei Wang,Houde She,Jingwei Huang
In this work, Molybdenum (Mo) doped bismuth vanadate (BiVO 4 ) is carried out by traditional calcination method, while carbon-based cobalt (Co-Ci) is prepared by photoelectric deposition (PED) and used as co-catalyst to decorate the surface, its photocurrent density reached 3.15 mA/cm 2 at 1.23 V vs RHE. More importantly, the H-Co-Ci/Mo: BiVO 4 photoanode obtained by plasma etching of Co-Ci/Mo: BiVO 4 has greatly improved surface hydrophilicity. The photocurrent density of H-Co-Ci/Mo: BiVO 4 photoanode is 4.8 times that of BiVO 4 photoanode, reaching 3.95 mA/cm 2 . In addition, the incident photon-current conversion efficiency (IPCE) value of the H-Co-Ci/Mo: BiVO 4 photoanode is as high as 60%, and both the injection and separation efficiency have also been enhanced. The enhanced photoelectrochemical (PEC) performance is attributed to the good wettability of the material surface and improvement of water oxidation kinetics. These findings provide a mild and efficient modification method for improving BiVO 4 used for water splitting, and are expected to provide new ideas for other photoanodes.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Changzhi Yin,Ying Tang,Junqi Chen,Feihu Li,Yijun Huang,Chunchun Li,Xianran Xing,Liang Fang
Two melilite ceramics Sr 2 AGe 2 O 7 (A = Mg, Zn) with low permittivity were prepared by a solid-state reaction method. The crystal structure and microstructure of the ceramics were characterized by X-ray diffraction, transmission electron microscopy , Raman spectroscopy , and scanning electron microscopy. Both ceramics crystallized in a single melilite structure with a tetragonal space group P-42 m (113) and exhibited homogeneous microstructures. Optimum microwave dielectric properties with relative permittivity ( ε r ) of 8.56, quality factor ( Q × f ) of 28,800 GHz, and temperature coefficient of resonance frequency ( τ f ) of −70.5 ppm/°C were obtained in Sr 2 MgGe 2 O 7 sintered at 1330 °C. Sr 2 ZnGe 2 O 7 possessed ε r of 8.81, Q × f of 35,700 GHz, and τ f of −84.4 ppm/°C when sintered at 1290 °C. Thermal stability of resonance frequency was accessible when the negative τ f values of Sr 2 AGe 2 O 7 were adjusted after the formation of composite ceramics with CaTiO 3 .
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高影响因子
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