CATALYSIS TODAY
·
2017
·
IF 4.636
Wenwu Zhou,Qing Zhang,Yasong Zhou,Qiang Wei,Lin Du,Sijia Ding,Shujiao Jiang,Yanan Zhang
USY zeolites have been modified by incorporation of gallium, phosphorus and a combination of gallium and phosphorus by wetness impregnation method using gallium nitrate and ammounium phosphate diabasic, and the corresponding NiMo supported hydrodesulfurization (HDS) catalysts have been prepared for HDS of an inferior FCC diesel. The individual physical-chemical properties of the modified USY zeolites and the series NiMo supported catalysts were characterized using XRD, N 2 -adsorption-desorption(BET), NH 3 -TPD, Py-FTIR, H 2 -TPR, HRTEM and XPS methods, and their catalytic performances for an inferior FCC diesel HDS were assessed. The results show that both gallium and phosphorus modification can modulate the acid property of USY zeolite and weaken the interaction between the active metal and the supports, thus enhancing the degree of sulfidation and the dispersion of Mo species that are beneficial for the HDS of highly refractory organosulfur compounds. The highest HDS and HDN efficiencies of 99.7% and 99.6%, respectively, were observed over the catalyst containing the PGaUSY zeolite. More importantly, gallium modification of the USY zeolite promotes the hydrodesulfurization of all organosulfur compounds, and especially 4,6-DMDBT, in the FCC diesel and phosphorus modification of the USY zeolite promotes the hydrodesulfurization of most organosulfur compounds except for 4,6-DMDBT in the FCC diesel.
研究领域:
催化化学
·
石油加工工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Haopeng Zhang,Yanqiu Xie,Fan Jiang,Fei Yao,Xin Gao,He Bai,Hongyan Yue
The construction of electrode materials with rational morphology and structure based on bimetallic sulfides is crucial to improve the performance of supercapacitors. Ultra-thin three-dimensional nickel molybdenum sulfide nanosheet spheres (NiMo 3 S 4 NSSs) are grown on nickel foam (NF) using a one-step hydrothermal synthesis. NiMo 3 S 4 NSSs have a diameter of ∼ 5 μm and nanosheet thickness of 200 nm. The effects of increasing the hydrothermal synthesis time and molar concentration ratios of Ni 2+ to MoO 4 2- on the morphologies of the NiMo 3 S 4 are investigated. Due to the synergistic effect of NiMo 3 S 4 NSSs and bimetallic ions which can provide a larger solution contact areas and improve the redox activity, the electrode exhibits good electrochemical properties. The specific capacity of NiMo 3 S 4 NSSs/NF electrode can reach 1002.4 C/g (1 A/g). After being assembled into a hybrid supercapacitor (HSC) with activated carbon (AC), the energy density can reach 72.1 Wh/kg at the power density of 749.9 W/kg. In addition, the HSC shows an excellent stability of 89 % after 10, 000 charge-discharge cycles (10 A/g).
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yayu Guan,Haicheng Xuan,Hongsheng Li,Peide Han
The MoS 2 /NiS–Ni 3 S 2 core-shell structure with flower-like microspheres morphology is a product of reasonable construction on nickel foam. The synergistic effect of heterostructure and abundant active sites make the catalyst exhibits excellent performance in alkaline solution, especially at high current. Specifically, at 200 mA cm −2 current density, the MoS 2 /NiS–Ni 3 S 2 composite exhibits small overpotential of 181 mV and Tafel slope of 70.0 mV dec −1 for hydrogen evolution reaction, and low overpotential of 460 mV and Tafel slope of 30.3 mV dec −1 for oxygen evolution reaction. Moreover, MoS 2 /NiS–Ni 3 S 2 can run stably for 12 h at 200 mA cm −2 current density without obvious fluctuation, showing excellent durability. Meanwhile, MoS 2 /NiS–Ni 3 S 2 as an electrolyzer achieves a current density of 10 mA cm −2 at 1.49 V, without decay after a durability test of 12 h. These superior properties of the MoS 2 /NiS–Ni 3 S 2 make it become a powerful competitor for the high activity bifunctional non-noble-metal electrocatalysts .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2515-2522
·
IF 2.799
Zhang Zhenwei,Jiang Xingmao,Hu Jianheng,Yue Chuanjun,Zhang Jintao
Mesoporous nitrogen-doped carbon was synthesized in a controlled manner by a modified deep eutectic solvent method using silica nanoparticles as templates. Various amounts of urea and glucose, which contain hydrogen acceptor and hydrogen bond donor groups were heated and stirred to form homogeneous liquid precursors like deep eutectic solvents, and nitrogen element was uniformly dispersed on an atom scale. Ni-Mo sulfides supported on mesoporous carbon with varying N dopping exhibit excellent hydrodesulfurization (HDS) catalytic performance such as high conversion and good recycling stability in the HDS of dibenzenethiophene. Further investigation showed that a suitable N content in the carbon support enhance the HDS properties and the HDS conversion could reach up to 96%. Graphical
研究领域:
材料化学
·
催化化学
·
纳米材料
·
能源化学
·
环境催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Yuncheng Ye,Xin Guo,Yongjun Ma,Qi Zhao,Yan Sui,Jia Song,Weijing Ma,Pengxue Zhang,Chuanli Qin
Transition metal sulfides have attracted extensive attention as promising electrode materials for advanced supercapacitors. However, their poor electronic conductivity and low utilization rate of the unfavorable structure still hinder energy-power outputting performance of supercapacitors. Herein, polypyrrole nanotubes@nickel-molybdenum sulfide (PNTs@NiMoS) core–shell composites were successfully synthesized via a one-step hydrothermal method in which honeycomb-like NiMoS nanoflakes were in-situ grown on the surface of PNTs. The introduction of PNTs with high conductivity as the core facilitates the rapid transportation of electrons and ions besides providing pseudocapacitance. And the in-situ grown NiMoS nanoflakes with special honeycomb-like as the shell provide much active sites accessible to electrolyte ions for charge storage. Owing to the synergistic electrochemical contributions from PNTs and NiMoS, the ratio-optimized PNTs@NiMoS exhibits the high specific capacitance of 1557.2 F g −1 at 1 A g −1 , remarkably superior to NiMoS (885.1 F g −1 ), PNTs (172.2 F g −1 ) and other reported bimetallic sulfides-based electrode materials. Moreover, the assembled asymmetric supercapacitor in 6 M KOH electrolyte with PNTs@NiMoS as the positive electrode and N-doped carbon nanotubes as the negative electrode delivers a superior energy density of 35.8 Wh kg −1 at a significantly high power density of 13719.1 W kg −1 , much higher than previously-reported similar supercapacitors. Furthermore, the asymmetric supercapacitor exhibits good cycling stability with the capacitance retention of 84.9% after 5000 cycles. This study offers a feasible strategy to design electrode materials with special microstructure for high-performance energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xiaoyang Xu,Linan Liang,Xiangjing Zhang,Xuteng Xing,Ying Zhao,Jianping Gao,Aijia Wei
The energy storage material NiMoS 4 with Faradaic redox reactions was grown on the reduced graphene oxide (RGO) lamella by a facile hydrothermal method , considering that RGO with the high surface area and conductivity can provide some channels for charge/ion transfer and active sites for redox reactions. The optimal NiMoS 4 /RGO composite can exhibit the high specific capacity of 124 mA h/g at 1 A/g, and be selected as positive electrode materials of hybrid supercapacitors . The assembled NiMoS 4 /RGO//activated carbon hybrid device possesses a high current density of 63 Wh/kg at a power density of 1125 W/kg and good cyclic stability with the capacity retention of 81 % after 5000 cycles. The prepared NiMoS 4 /RGO composite is a promising electrode material for supercapacitors .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Wenpeng Han,Mingxing Tang,Jinlong Li,Xuekuan Li,Junwei Wang,Ligong Zhou,Ying Yang,Yuqi Wang,Hui Ge
The efficient transformation of biomass resources to biofuels has attracted much attention. Herein, ordered mesoporous alumina supported nickel-molybdenum sulfide catalysts (denoted as Ni-MoS 2 /mAl 2 O 3 ) were prepared by evaporation-induced self-assembly (EISA) method and used for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Under mild conditions (130 °C, 1 MPa H 2 ), the 5Ni-7MoS 2 /mAl 2 O 3 catalyst achieved 95 % yield of DMF. The results of characterizations and DFT calculation showed that the active center was proposed to the coordinated unsaturated site (CUS) located at S-edge. And the intrinsic activity of CUS was directly related to the proportion of Mo substituted by Ni. The 5Ni-7MoS 2 /mAl 2 O 3 catalyst containing CUS with high proportions of Ni replacing Mo showed higher TOF and lower apparent activated energy. Besides, 2-propanol can cooperate with molecular hydrogen to improve DMF yield by forming ethers that were easier to be hydrogenolyzed. The present findings provided a new catalytic system for converting HMF to DMF.
研究领域:
生物化学
·
催化化学
·
生物质转化
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Ning Li,Wenwen Zhao,Linping Li,Yangqin Gao,Lei Ge
Photocatalysts with hollow structures have drawn great interest owing to their high specific surface area, which can enhance the photocatalytic performance. Herein, we designed the hollow cubic Cu2–xS@Ni–Mo–S nanocomposites by vulcanizing from the Cu2O template and loading the Ni–Mo–S lamellas. The Cu2–xS@Ni–Mo–S composites greatly improved the photocatalytic hydrogen performance. Among them, Cu2–xS–NiMo-5 achieved the optimal photocatalytic rate of 1326.07 μmol/g h, which is approximately 3.85 times higher than that of hollow Cu2–xS (344 μmol/g h) and had good stability for 16 h. The enhanced photocatalytic property was attributed to the metallic behavior of bimetallic Ni–Mo–S lamellas and the LSPR (localized surface plasmon resonance) effect of Cu2–xS. The bimetallic Ni–Mo–S can effectively capture the photogenerated electrons and quickly transfer-diffuse to produce H2. Meanwhile, the hollow Cu2–xS not only provided many more active sites to take part in the reaction but also introduced the LSPR effect to increase the solar utilization. This work provides valuable insights into the synergistic effect of using non-precious metal co-catalysts and the LSPR materials to assist in the photocatalytic hydrogen evolution.
研究领域:
材料化学
·
光催化
·
能源科学
·
纳米材料
·
半导体物理
·
可再生能源
·
表面科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 9
·1-11
·
IF 2.4
Du Yuhao,Hu Dawei,Wang Zhen,Hu Anpeng,Han Wei,Pu Ning
The hydrotreating of residual oil is crucial for producing cleaner fuels, as catalyst deactivation due to metal deposits, particularly nickel (Ni) and vanadium (V), remains a significant challenge. Contrary to the conventional view that metal deposits invariably poison catalysts, our recent studies have observed an unexpected enhancement in the activity of commercial NiMo/Al 2 O 3 catalysts during industrial operation. This study systematically investigates the mechanism behind this counter-intuitive phenomenon, with a particular focus on the effects induced by nickel. X-ray photoelectron spectroscopy (XPS) analysis revealed that low-concentration of Ni deposits preferentially formed highly active NiMoS phases during the reaction process, thereby minimized the formation of NiS x , a typical poisoning species. This increases the number of reactive sulfur sites, boosting the hydrodesulfurization (HDS) activity for 4,6-dimethyldibenzothiophene (4,6-DMDBT), with the conversion rate rising from 17.1 to 73.3%. Similar promoting trends were also observed in conventional NiMo/Al 2 O 3 catalysts upon Ni deposition, demonstrating the generality of this effect. Our findings not only provide new insights into the dual role of Ni deposits in catalyst performance but also offer a promising strategy designing industrial metal-poisoning-resistant catalysts with significantly enhanced operational lifespan as well as catalytic performance.
研究领域:
催化化学
·
化学工程
·
材料科学
·
石油炼制
·
表面科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 3
·882-890
·
IF 8.183
Kang Xin,Liu Jiancong,Tian Chungui,Wang Dongxu,Li Yaorui,Zhang Hongyan,Cheng Xusheng,Wu Aiping,Fu Honggang
Size-controlled synthesis of two-dimensional (2D) catalysts with low stacking numbers and small nanoflake lengths is crucial for promoting the catalytic performance in diverse heterogeneous catalysis. Herein, we report a facile and general “surface curvature-confined synthesis” strategy to modulate the slab lengths and stacking numbers of 2D transition metal sulfides by controlling the strain induced by different surface curvature of supports. An efficient NiMo sulfide with shorter slab length (average 3.71 nm), less stacking number (1–2 layers) and more edge active sites is synthesized onto ZSM-5 zeolites with the average size of 100 nm, which shows superior k HDS value of dibenzothiophene (14.05 × 10 −7 mol/(g·s)), enhanced stability up to 80 h, and high direct desulfurization selectivity (> 95%). This design concept is also proved to be generally applicable to modulate the slab lengths and stacking numbers of other 2D catalysts such as MoS 2 and WS 2 nanoflakes, which shows great potentials for developing more ultrasmall 2D catalysts with controlled sizes and excellent catalytic activities.
研究领域:
催化
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）