INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Dongmou Luo,Shusen Liu,Junjie Liu,Jinxian Zhao,Chao Miao,Jun Ren
Graphitic carbon nitride (g-C3N4) supported CoOx catalysts were prepared by the impregnation method and comprehensively characterized by XRD, N2 physisorption, TEM, H2-TPR, and XPS. The catalytic performance tested by catalytic combustion of toluene indicates that 10% CoOx/g-C3N4 catalyst exhibits the highest activity, achieving a toluene conversion of 90% at a temperature of approximately 279 °C, compared with other CoOx catalysts supported on SBA-15, γ-Al2O3 and activated carbon (AC). The specific structure of g-C3N4 made it a N and electron-rich material, which might be the reason for the existence of Co3O4 active phase, high surface Co3+ content and high density of surface oxygen adsorption species, and facile reducibility of Co3+. Moreover, no significant decrease in catalytic efficiency is observed over different temperature stages on the 10% CoOx/g-C3N4 sample, which indicates that the catalyst’s stability is excellent under the conditions required for toluene combustion.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhengliang Zhang,Zhiwei Zhang,Xubin Zhang,Fumin Wang,Zheng Wang,Yongwang Li,Xingtao Wang,Rosine Ahishakiye,Xu Zhang
Exploring low-cost green catalysts to achieve green organic chemicals and fuels from biomass is one of the crucial ways to solve the energy crisis. The 20 wt% Co-CoO x /AC catalysts were prepared to achieve the one-pot conversion of furfural to 2-methylfuran under milder reaction conditions (120 °C, 2.5 MPa H 2 ), shorter reaction time (5 h) and less catalyst dosage by regulating the ratio of metal to oxide species. The yield of 2-methylfuran reached 87.4 % is achieved under 20 wt% Co-CoO x /AC catalyst conditions, and there was no significant degradation of all catalyst properties after five cycles. Characterization results showed that the active components in the catalyst were present as Co 0 species with CoO x species. The reaction mechanism was explained by combining the characterization results, experimental data and DFT calculations. The formyl group of the furfural side chain is first adsorbed on the Co 0 species, and furfuryl alcohol is produced in the presence of the Co 0 species. Subsequently, the CoO x species adsorbs the C O bond on the side chain, which is broken in the presence of the CoO x species to form 2-methylfuran. The excellent catalytic activity of the 20 wt% Co-CoO x /AC catalyst provide a promising application for preparing 2-methylfuran by hydrodeoxygenation of furfural.
研究领域:
化学工程
·
催化科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaofeng Wang,Zuyi Zhang,Ziyi Yan,Qingbo Li,Chengcheng Zhang,Xinhua Liang
The efficient hydrodeoxygenation (HDO) of biomass derivatives to yield specific products is a significant yet challenging task. In the present study, a Cu/CoO x catalyst was synthesized using a facile co-precipitation method, and subsequently used for the HDO of biomass derivatives. Under optimal reaction conditions, the conversion of 5-hydroxymethylfurfural reached 100% with a selectivity of ∼99% to 2,5-diformylfuran. In combination with the experimental results, systematic characterizations revealed that CoO x , as the acid site, tended to adsorb C O bonds, and the metal sites of Cu + were inclined to adsorb C O bonds and enhance C O bond hydrogenation. Meanwhile, Cu 0 was the main active site for 2-propanol dehydrogenation . The excellent catalytic performance could be attributed to the synergistic effects of Cu and CoO x . Further, by optimizing the ratio of Cu to CoO x , the Cu/CoO x catalysts exhibited notable performance in HDO of acetophenone, levulinic acid, and furfural, which verified the universality of the catalysts in the HDO of biomass derivatives.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 16
·11024-11036
·
IF 3.442
Yang Lu,Wang Yanhua,Liu Aihua,Zhang Yang
A novel biomass carbon doped with dual-metal oxide mischcrystal (cobalt oxide and molybdenum oxide) was synthesized by using Enteromorpha (EP) of marine algae as carbon source. Multi-wrinkles biomass carbon (MWBC) with magnetic properties was obtained and formed highly dispersed CoO x /MoO y nanoparticles onto the surface of MWBC in situ via a simple impregnation and direct carbonization at 700 °C. The framework of CoO x /MoO y @MWBC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The as-prepared CoO x /MoO y @MWBC was applied as efficient adsorbents for selective removal methyl blue (MB) at pH 10 from water medium. For comparison, single metal-derived porous carbon, i.e., CoO x @MWBC and MoO y @MWBC, was also synthesized, characterized and tested for MB adsorption. The results exhibited that CoO x /MoO y @MWBC has the highest MB adsorption capacity (1587.3 mg g −1 ) and excellent selectivity. In addition, it could be easily separated from water by an external magnetic field without any organic reagent added. Adsorption equilibrium data were described by Langmuir and Freundlich isotherms, and kinetic data were described by pseudo-first-order, pseudo-second-order and intraparticle diffusion model. Moreover, CoO x /MoO y @MWBC also owned outstanding stability and renewability, which can be regenerated by an easy-going method of ethanol washing and reused at least 10 times without a significant loss in removal percentage.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 32
·14822-14830
·
IF 3.591
Victor Charles,Yong Yang,Menglei Yuan,Jitao Zhang,Yaling Li,Jingxian Zhang,Tongkun Zhao,Zhanjun Liu,Bin Li,Guangjin Zhang
The water oxidation reaction involves a four electron–proton coupled process that is kinetically sluggish and has hindered the widespread application of water-splitting technology. Metal-MOF-coupled heterostructures serve as good OER electrocatalysts due to their endowed MOF frameworks and numerous transition metal active sites at the interface. In this study, a simple ultrasonic impregnation strategy was used to prepare CoOx/UiO-66-300 and NiO/UiO-66-300 heterostructures via the impregnation of Co and Ni ions into UiO-66 followed by roasting in air at 300 °C to obtain heterostructures with UiO-66-retained frameworks as revealed by SEM. The electrochemical results show that the respective impregnation successfully modulated the electronic charge at the interface of the heterostructures, leading to rapid electron transfer that enhanced the OER activity. CoOx/UiO-66-300 and NiO/UiO-66-300 heterostructures showed good oxygen evolution reaction activities of 283 mV and 291.6 mV, respectively, due to the retained UiO-66 framework, while CoOx/UiO-66-550 and NiO/UiO-66-550 heterostructures calcined at 550 °C showed a decrease in OER activities of 332.6 mV and 346.6 mV, respectively, due to the collapsed UiO-66 framework. This work gives insight into the development of heterostructures of MOF-retained frameworks for energy applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaobao Zhang,Baiyi Shao,Aoping Guo,Zhe Gao,Yong Qin,Ce Zhang,Fangming Cui,Xiaojing Yang
Co-Ni bimetallic oxides were successfully deposited on Ti 3 C 2 T x MXene nanosheets by atomic layer deposition technology and used as pseudocapacitive materials for supercapacitors. The uniform distribution of metal oxide nanoparticles on MXene nanosheets endows the pseudocapacitive materials more active sites and the synergistic effect between CoO x and NiO greatly improves the electrochemical performance. Specifically, as the deposited cycle increased to 90, the sample showed the optimal electrochemical performance with specific capacitance up to 1960 F g −1 (1 A g −1 ), 20.3 times higher by than that of Ti 3 C 2 T x MXene, excellent rate capability (87.3% capacitance retention, 1–18 A g −1 ) and 90.2% capacitance retention after 8000 cycles.
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
Advanced Science
·
2018
·Vol. 5
·期 9
·1800514
·
IF 12.441
Jie Yu,Yijun Zhong,Xinhao Wu,Jaka Sunarso,Meng Ni,Wei Zhou,Zongping Shao
Hydrogen production from renewable electricity relies upon the development of an efficient alkaline water electrolysis device and, ultimately, upon the availability of low cost and stable electrocatalysts that can promote oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Normally, different electrocatalysts are applied for HER and OER because of their different reaction intermediates and mechanisms. Here, the synthesis of a heterostructured CoP@a-CoOx plate, which constitutes the embedded crystalline cobalt phosphide (CoP) nanoclusters and amorphous cobalt oxides (CoOx) nanoplates matrix, via a combined solvothermal and low temperature phosphidation route is reported. Due to the presence of synergistic effect between CoP nanoclusters and amorphous CoOx nanoplates in the catalyst, created from the strong nanointerfaces electronic interactions between CoP and CoOx phases in its heterostructure, this composite displays very high OER activity in addition to favorable HER activity that is comparable to the performance of the IrO 2 OER benchmark and approached that of the Pt/C HER benchmark. More importantly, an efficient and stable alkaline water electrolysis operation is achieved using CoP@a-CoOx plate as both cathode and anode as evidenced by the obtainment of a relatively low potential of 1.660 V at a 10 mA cm −2 current density and its marginal increase above 1.660 V over 30 h continuous operation.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Tariq Ali,Yiwei Li,Bingjie Fang,Saleem Raza,Yeyuan Xiao
Photocatalysis can decolorize dye-laden wastewaters using light, but practical catalysts often suffer from narrow absorption, charge recombination, and stability limits. Here we synthesize a carbonate-intercalated cobalt–aluminum layered double hydroxide hosting cobalt-oxide nanocluster (CoAl-LDH/CoOx) via a one-pot hydrothermal route and evaluate its performance for dye decolorization and UV/H2O2 treatment of real textile wastewater. Under UV irradiation, CoAl-LDH/CoOx accelerates discoloration of methyl orange (MO) and Congo red (CR), following pseudo-first-order kinetics (e.g., MO: ∼98% removal at 5 mg L−1 in 100 min; CR: ∼100% at 100 mg L−1 in 100 min; kapp up to 0.14 min−1). On real textile wastewater (ADMI0 = 608.1), UV/H2O2 with 0.5 g L−1 catalyst achieved ∼80% American Dye Manufacturer's Institute (ADMI) removal in 120 min at 48.96 mM H2O2; outdoor sunlight tests removed 82.5% (raw influent) and 50.8% (biologically treated effluent) over 20 h. Scavenger tests and EPR spin-trapping implicate h+ and ˙O2− as dominant species under UV, with ˙OH contributing when H2O2 is present. Five-cycle tests indicate stable activity. The one-pot CoAl-LDH/CoOx heterostructure provides a robust, recyclable platform for interfacial charge-transfer-assisted photocatalysis on realistic effluents and motivates follow-up on mineralization and leaching.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2026
·Vol. 40
·期 33
·18068-18080
·
IF 6
Fu Zong-Pin,Zhao Yun-Peng,Wu Yu-Fa,Qiu Le-Le,Liu Fang-Jing,Zhong Mei,Liang Jing,Cao Jing-Pei
Efficient depolymerization of lignite remains challenging
owing
to both its structural complexity and the high stability of oxygen-containing
bridge linkages. Herein, low-temperature pyrolysis and oxidative pretreatments
were employed to regulate oxygen-containing structures and enhance
the hydrogenolysis reactivity of Zhaotong lignite (ZT). These pretreatments
promoted the structural evolution of lignite, activated oxygen-containing
bridge structures, and suppressed the recondensation of reactive intermediates,
thereby facilitating subsequent depolymerization reactions. A CuCoOx
catalyst capable of dynamic in situ reconstruction was introduced
for catalytic hydrogenolysis. Under reaction conditions, partial reduction
of CuCoOx generated reconstructed Cu 0 -CoOx interfacial
active sites, where the synergistic interaction between metallic Cu
and defect-rich CoOx promoted H 2 activation and selective
C–O bond cleavage. Density functional theory (DFT) calculations
further revealed that interfacial electron redistribution at the Cu
cluster/Vo-Co 3 O 4 (311) interface facilitated
H 2 activation and stabilized reactive hydrogen species.
These findings provide new mechanistic insights into pretreatment-regulated
and interface-controlled hydrogenolysis pathways for the efficient
valorization of low-rank coal.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 21
·10510-10516
·
IF 8.867
Jing Wang,Zhongzhe Wei,Haiyan Wang,Yiqing Chen,Yong Wang
Water splitting is the mainstay of contemporary energy conversion and storage engineering. The design of earth-abundant electrode materials without extra binders for an efficient hydrogen evolution reaction (HER) is critical in realizing the hydrogen economy in the push for future sustainable development. Herein, three-dimensional (3D) porous electrodes (denoted CoOx–CNT–CC) featuring CoOx nanoparticles (NPs) and carbon nanotubes (CNT) growing on activated carbon fiber were synthesized through a one-pot pyrolysis process. The achieved 3D electrodes acted as efficient electrocatalysts as well as current collectors for hydrogen production, greatly simplifying the electrode preparation process. Impressively, the electrodes exhibited high current density under low overpotential. The current density can reach up to ∼720 mA cm−2, an overpotential of ∼99 mV is required to reach a current density of 20 mA cm−2, and they function with a durability of up to 70 h. Beyond that, the electrodes still show superb catalytic properties at low temperature (the current density is 326 mA cm−2 even at 278 K) and in a neutral medium (the current density is 450 mA cm−2 in 1 M PBS).
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Chen Chen,Zhuojun Yang,Wei Liang,Hao Yan,Yongxiao Tuo,Yanpeng Li,Yan Zhou,Jun Zhang
In this paper, we report a facile strategy to synthesize Co-BDC-NH 2 material, which is used as a precursor towards an excellent OER electrocatalyst by thermal annealing in nitrogen. Ultra-small Co/CoO x nanoparticles were uniformly dispersed on the rhombus N-doped carbon (NC) nanoflakes. Transmission electron microscopic, X-ray diffraction spectrometric, and X-ray photoelectron spectroscopic analyses revealed the coexistence of metallic Co and Co oxides nanoparticles. It was found that Co/CoO x @NC obtained at 500 °C annealing temperature exhibited the highest electrocatalytic OER activity, with 307 and 375 mV overpotential to achieve 10 and 100 mA cm −2 current densities. Besides, thanks to the in-situ annealing process, Co/CoO x @NC showed excellent catalytic stability with 97.4% current density retention after 24 h electrolysis at 1.66 V vs. RHE electrode potential. Further investigations revealed that the ultra-small Co/CoO x nanoparticles distributed on N-doped carbon template contribute significantly towards OER electrocatalysis through enlarging the activity surface areas and enhancing the intrinsic electrochemical activity due to the presence of metallic Co.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2022
·Vol. 12
·期 8
·3769
·
IF 2.838
Wei Ma,Dong Ye,Haining Wang
Herein, a series of Co-Fe mixed oxide modified ZSM-5 adsorbents were synthesized using the ultrasonic-assisted impregnation method for the capture of elemental mercury. In comparison with other samples, Co4Fe1-ZSM-5 produced a relatively better performance, with the removal efficiency of around 96.6% Hg0and the adsorption capacity of around 901.63 ug/mg Hg0achieved at 120 °C. The interaction between CoOxand FeOximproved the reducibility of oxygen species, thus promoting the oxidation of Hg0. Among a variety of other gas components, O2and NO exerted a positive effect on Hg0, which improved its removal to a certain extent. By contrast, SO2caused an adverse effect on the capture of Hg0, which could be reversed to some degree by the introduction of 5% O2. After five cycles, the mercury removal efficiency of Co4Fe1-ZSM-5 remained above 90%, suggesting excellent recyclability. Finally, XPS analysis was conducted to reveal that Mars–Maessen mechanisms are dominant in the process of mercury adsorption.Keywords:Hg0adsorption;ZSM-5;cobalt oxide;iron oxide;regeneration
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）