CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Shanhai Zhao,Yidan Luo,Chunhe Li,Kuankuan Ren,Yanyan Zhu,Weidong Dou
The synthesis of renewable fuel by CO 2 reduction is a promising research direction. The CO 2 reduction reaction may be promoted using photothermal catalysis to achieve efficient CO 2 conversion under mild conditions. In this context, designing efficient catalysts is urgent. In this work, ABO 3 (A = La, Ce; B = Ni, Co, Fe) perovskite catalysts were prepared by coprecipitation and calcination . Experimental results show that the A-site ions and B-site ions in ABO 3 perovskite nanomaterials have a great influence on their structure and photothermal catalytic performance. Among them, the LaNiO 3 catalyst shows excellent photothermal catalytic performance in the conversion of CO 2 to CO and CH 4 , which can generate 0.16 mmol g −1 h −1 CO and 1.38 mmol g −1 h −1 CH 4 at low CO 2 and H 2 concentrations. For the LaNiO 3 sample, its enhancement of catalytic performance mainly benefits from the largest number of active sites, the fastest carrier transport rate, and a relatively suitable band edge position compared with other catalysts. This study proposes a new method for improving the activity and selectivity of photothermal CO 2 reduction and offers a new direction for the recycling of waste gas.
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高影响因子
FUEL
·
2023
·
IF 7.4
Fukun Bi,Shuting Ma,Bin Gao,Yang Yang,Lexun Wang,Fuhao Fei,Jingcheng Xu,Yuandong Huang,Minghong Wu,Xiaodong Zhang
Herein, Pd and Pt-catalysts loaded on non-oxide support (g-C 3 N 4 ) were prepared and compared for CO and toluene co-oxidation, and Pt/C 3 N 4 presented excellent catalytic performance. A series of characterizations including TEM, H 2 -TPR, O 2 -TPR and XPS etc., indicated that Pt/C 3 N 4 exhibited the smaller Pt NPs, better low temperature reduction ability, more active oxygen species and positive charged Pt species, which could account for its better catalytic performance. Additionally, DFT calculations further confirmed that the lower activation barrier of O 2 and the higher adsorption for CO and toluene triggered the efficient CO and toluene degradation over Pt/C 3 N 4 . Interestingly, the introduction of H 2 O (10.0 vol%) suppressed the catalytic performance of Pd/C 3 N 4 , while expedited CO and toluene oxidation over Pt/C 3 N 4 , which was revealed by DFT calculations. Furthermore, the difference in degradation intermediates, corresponding distributions and toxicity generated during toluene oxidation under different conditions over Pd/C 3 N 4 and Pt/C 3 N 4 were exposed. Compared with Pd/C 3 N 4 , less variety, toxicity and content of intermediates produced over Pt/C 3 N 4 . This work would inspire many rational designs of supported noble metal catalysts for environmentally friendly catalysis.
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高影响因子
Journal of Cleaner Production
·
2017
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IF 5.715
Chao Zhang,Dongya Yang,Tao Zhang,Fengxian Qiu,Yuting Dai,Jicheng Xu,Zefeng Jing
Oil-absorbing materials with three-dimensional network structure are being actively investigated due to their application in the treatment of oil spills and chemical leakage which result from their controllable porous structures and swelling properties. In this work, the oil-absorbing MnO 2 /poly( n -butylacrylate- co -butyl methacrylate- co -methyl methacrylate) resin composite (MnO 2 /p(BA-co-BMA-co-MMA)) was synthesized by using a combined hydrothermal method and microwave polymerization method , and was successfully applied to absorb oils and organic solvents. In this synthesis, the MnO 2 hollow spheres were prepared via a simple hydrothermal method and modified by γ-methacryloxypropyl trimethoxysilane (KH-570) under microwave irradiation. Then, the MnO 2 /p(BA-co-BMA-co-MMA) hybrid resin with good oil absorption capacity and excellent recyclability were synthesized through suspension polymerization by a microwave polymerization route. The as-prepared samples were characterized by Fourier transmission infrared spectroscopy (FT-IR), X-ray diffraction (XRD), contact angle, scanning electron microscopy (SEM), etc. The as-prepared porous-structured MnO 2 that are comprised of individual microrods possess self-organized shaggy, ball-shaped architectures with sizes ranging from 2 to 4 μm. In order to obtain the hydrophobic surfaces, the surfaces of MnO 2 microspheres were chemically modified by KH-570 under microwave irradiation. And the surface of modified MnO 2 show high repellency towards water with a water contact angle of 135°. Moreover, the absorption properties of the MnO 2 /p(BA-co-BMA-co-MMA) hybrid resins were tested in this work. The results indicated that the oil absorption properties were strongly influenced by the content of MnO 2 hollow spheres. Furthermore, the MnO 2 /p(BA-co-BMA-co-MMA) hybrid resin has a maximum absorption capacities of 34.56 g*g −1 , 31.82 g*g −1 and 25.89 g*g −1 for the absorption of chloroform, carbon tetrachloride and toluene respectively and could selectively remove oils from water which is promising for their potential applications in oil spill cleanup.
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高影响因子
FOOD CHEMISTRY
·
2024
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IF 8.5
Shuya Xue,Jiamin Zou,Jiapeng Li,Jingkun Xu,Hui Chen,Linyu Wang,Yansha Gao,Xuemin Duan,Limin Lu
Precisely detecting trace pesticides and their residues in food products is crucial for ensuring food safety. Herein, a high-performance electrochemical sensing platform was developed for the detection of carbendazim (CBZ) using Co,N co-doped hollow carbon nanocage@carbon nanotubes (Co,N-HC@CNTs) obtained from core–shell ZIF-8@ZIF-67 combined with a poly(3,4-ethylenedioxythiophene) (PEDOT) molecularly imprinted polymer (MIP). The Co,N-HC@CNTs exhibited excellent electrocatalytic performance, benefitting from the synergistic effect of CNTs that provide a large specific surface area and excellent electrical conductivity , Co,N co-doped carbon nanocages that offer high electrocatalytic activity and hollow nanocage structures that ensure rapid diffusion kinetics. The conductive PEDOT-MIP provided specific binding sites for CBZ detection and significantly amplified the detection signal. The sensor showed superior selectivity for CBZ with an extremely low detection limit of 1.67 pmol L −1 . Moreover, the method was successfully applied to detect CBZ in tomato, orange and apple samples, achieving satisfactory recovery and accuracy, thus demonstrating its practical feasibility.
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PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
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IF 8.4
Xinyao Li,Liangzhong Li,Zhichao Huang,Zhaofeng Chang,Zhuo Tu,Luping Tian,Wei Du,Hao Li,Peng Zhang,Bo Pan
In the research on the preparation of biochar from co-pyrolysis of red mud (RM) and biomass, the synergistic mechanism of immobilizing heavy metals (HMs) and enhancing the stability of biochar is seldom reported. In this study, the effects of different mass ratios of corn stalks (CS) and RM (9:1, 3:1, 2:1, 1:1) and pyrolysis temperatures (300 °C, 450 °C, 600 °C) on the physicochemical properties, carbon stability, HMs speciation, and their potential risks were investigated. Furthermore, the mechanism of the co-pyrolysis process to enhance biochar stability and facilitate transformation of HMs speciation was analyzed. The results showed that co-pyrolysis of CS with RM significantly enhanced biochar's oxidation resistance (I D /I G = 0.61, R 50,biochar = 0.52), and simultaneously increased the stabilized state proportion of Ni, Cr, and Cd that exceed standard limits, thereby reduced the biochar phytotoxicity (GI = 193.20%). During the co-pyrolysis process, the metals and metal minerals in RM catalyzed the cleavage of CS, promoting the formation of condensed aromatic carbon structures in biochar, which adsorbed the free HMs to form organic carbon-metal/metal oxide complexes through coordination, achieving the dual roles of immobilizing HMs and enhancing the stability of biochar. In addition, the formation of large aggregates and the conversion of free HMs into metal oxides are important mechanisms for co-pyrolysis to enhance the biochar stability and HMs immobilization, respectively. This study provides a feasible and promising direction for the synergistic and efficient resource utilization of industrial and agricultural waste.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Shandi Zhong,Cai Xu,Quanfu Long,Hang Zhou,Jianhai Yang,Jia Guo,Xiaozhong Wang,Liyan Dai
Using O 2 as an oxidant, developing a non-noble metal catalyst for the selective catalytic C–H bond oxidation of p-chlorotoluene is desirable and challenging. In this work, a series of Co, Cr co-doped OMS-2 (Octahedral Molecular Sieve-2) catalysts were prepared by a conventional refluxing method. It was found that the incorporation of Co and Cr improved the catalytic activity for the selective oxidation of p-chlorotoluene to p-chlorobenzaldehyde. Among these catalysts, CoCr/OMS-2 (Co: Cr = 1: 1, mass ratio), the best catalyst, shows that the conversion and the selectivity of p-chlorobenzaldehyde is 94.8 % and 94.3 %, respectively. The enhanced catalytic activity was due to the larger specific surface area and even dispersion of active components. The characterization results also disclosed that the co-doping of Co and Cr increased the oxygen vacancy and enhanced the ability to activate the surface lattice oxygen. Additionally, density functional theory calculations demonstrated that co-doping of Co and Cr promoted the adsorption of p-chlorotoluene and O 2 , and decreased the energy barrier of rate-determining step (the conversion of p-chlorobenzyl alcohol to p-chlorobenzaldehyde). Besides, when H 2 O was added to the reaction system as the second solvent, the activation and dissociation of O 2 , and the formation of p-chlorobenzaldehyde were facilitated, in agreement with the experimental results. This work demonstrated the promotional effect of Co, Cr co-doped into OMS-2 catalyst and the role of H 2 O for the selective oxidation of p-chlorotoluene.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
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IF 8.1
Zhongrui Li,Lei Guo,Wenchen Ren,Junjie Han,Santosh Kumar Verma,Shihang Xu,Lin Liu,Tong Zhang,Yunhua Xu
The design of efficient ammonia cracking catalysts is the key to developing ammonia as a hydrogen storage carrier. This paper investigated the role of Co–Al hydrotalcite carriers in ruthenium-based catalysts. Ru/Co–Al catalysts were prepared by mechanical milling, impregnation, and co-precipitation, and the catalytic activity and physicochemical properties of the catalysts were investigated, respectively. The catalysts prepared by the co-precipitation method exhibit the maximum specific surface area and metal dispersion due to the layered structure of LDH and the homogeneity of the co-precipitation method. In this study, it is concluded that the substitution of Ru during the co-precipitation preparation builds up strong metal-carrier interactions and generates a large number of oxygen vacancies. The catalyst prepared by the co-precipitation method exhibited a high H 2 generation rate (19.5 mmol·gcat −1 ·min −1 ) at GHSV = 30,000 ml·gcat −1 ·h −1 and 450 °C, and the performance remained stable after 50 h of reaction. This work provides a new idea for designing efficient Ru-based catalysts.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
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IF 2.5
Xiao Zhengting,Li Qingyang,Li Guangci,Wang Wentai,Li Xuebing,Chen Song,Li Chunhu
A series of Co-Mo sulfide catalysts with tube-like hollow structure were prepared by a low temperature pre-sulfurization method using various CoMoO 4 as precursors synthesized by coprecipitation process at different temperature. The crystallite structure of CoMoO 4 precursors determined the properties of Co-Mo sulfide catalysts, including pore structure, concentration of CoMoS active phase, microstructure of MoS 2 slabs, and desulfurization activity. The higher temperature led to better crystallinity of CoMoO 4 precursor, resulting in less CoMoS active phase and fewer Mo atoms at the corner sites of the pre-sulfurized catalyst. In addition, the MoS 2 slabs with shorter length and more stacking layers (especially Co-promoted MoS 2 slabs) in the catalysts are also formed at appropriate precursor preparation temperature, which are favorable for forming more unsaturated coordination sites (especially corner sites). According to the results of hydrodesulfurization of dibenzothiophene on the Co-Mo sulfide catalysts, the reaction rate and the production yield are highly dependent on the number of surface-active centers, while the activity is mainly attributed to the Type II CoMoS species.
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高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Dong Liu,Rundong Wu,Xianjie Wang,Runping Ye,Feiyang Hu,Xiaohan Chen,Tongtong Wang,Bingying Han,Zhang-Hui Lu,Gang Feng,Rongbin Zhang
It is crucial to eliminate CO emissions using non-noble catalysts. Cu-based catalysts have been widely applied in CO oxidation, but their activity and stability at low temperatures are still challenging. This study reports the preparation and application of an efficient copper-doped ceria electrospun fiber catalyst prepared by a facile electrospinning method. The obtained 10Cu–Ce fiber catalyst achieved complete CO oxidation at a temperature as low as 90 °C. However, a reference 10Cu/Ce catalyst prepared by the impregnation method needed 110 °C to achieve complete CO oxidation under identical reaction conditions. Asymmetric oxygen vacancies (ASOV) at the interface between copper and cerium were constructed, to effectively absorb gas molecules involved in the reaction, leading to the enhanced oxidation of CO. The exceptional ability of the 10Cu–Ce catalyst to adsorb CO is attributed to its unique structure and surface interaction phase Cu+-Ov-Ce3+, as demonstrated by a series of characterizations and DFT calculations. This novel approach of using electrospinning offers a promising technique for developing low-temperature and non-noble metal-based catalysts.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haoran Song,Longyu Chen,Yi hang Xu,Chen Li,Xuewei Hu,Yingjie Li,Shugen Liu,Jianhong Huang,Qun Zhao,Jie Li,Senlin Tian
Activation of peroxymonosulfate (PMS) by MXene-supported Co 3 Ti and single-atom Co catalyst (Co@MXene) achieved the efficient decomplexation of lead-ethylenediaminetetraacetic acid (Pb-EDTA) and the recovery of lead (Pb) over the pH range of 3.0–9.0. The removal efficiency of Pb-EDTA reached up to 93.6 % within 30 min and total Pb was completely removed within 15 min. The coordination structure differences between Co 3 Ti and single-atom Co induced their various electron transfer pathways with PMS, in which Co 3 Ti brought key effect to the generation of Co (Ⅳ), while single-atom Co and regenerative Co (II) were responsible for the generation of HO and SO 4 − and 1 O 2 , More importantly, the oxygen transfer reaction from O-Co 3 Ti to Co 3 Ti-O and the reducibility of MXene triggered the regeneration of low-valent Co. This study proposed a novel mechanism of Co (Ⅳ) generation and low-valent Co regeneration, which improved the understanding of the electron transfer pathways of Co@MXene/PMS oxidation process.
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高影响因子
RENEWABLE ENERGY
·
2025
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IF 9.1
Jingchuan Guo,Yan Gao,Xuankai Cao,Linxuan Li,Xin Yu,Shidan Chi,Haoyu Liu,Guohong Tian,Xudong Zhao
The technology of using electricity generated from renewable energy sources such as wind and solar power for water electrolysis to produce hydrogen has achieved high efficiency, high purity, and environmental friendliness. However, its further development is constrained by the high overpotential of the oxygen evolution reaction (OER) and the high cost of precious metal catalysts. The methanol oxidation reaction (MOR) as an alternative to OER can significantly reduce overall energy consumption and accelerate the hydrogen evolution reaction. This study innovatively utilizes the metal-organic framework (MOF) of NH₂-MIL-88(Fe) to introduce Ni doping, preparing a series of Fe x Ni y -MOF and their bimetallic carbon derivatives (Fe x Ni y /C) through solvothermal synthesis and high-temperature carbonization. Results show that FeNi₂/C exhibited excellent performance in OER, with a Tafel slope of 38.69 mV·dec⁻ 1 and an overpotential of 335 mV at 10 mA cm⁻ 2 , comparable to RuO₂. In MOR, the overpotential was 193 mV, reduced by approximately 140 mV compared to OER, with outstanding stability. The catalytic mechanism was analyzed using ion chromatography, revealing the key role of Ni doping in enhancing catalytic activity and stability. This study provides new strategies for improving the electrocatalytic hydrogen production efficiency of renewable energy and reducing the production cost of hydrogen energy.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9871-9885
·
IF 10.7
Longyan Chen,Pengkun Zhang,Dong-Hau Kuo,Jianmei Jiang,Binghong Wu,Zhengjie Su,Osman Ahmed Zelekew,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, we demonstrate a Co/S doped TiO2 bimetal sulfur oxide nanoparticle catalyst (labeled CoTiOS) with heterovalent Co states and abundant oxygen vacancy (Ov) defects for the photocatalytic nitrogen reduction reaction (PNRR) in an ambient environment. Co/S co-doping converted TiO2 into a catalyst for visible light photocatalytic nitrogen fixation. The incorporation of Co endows TiO2 with better electrical conductivity and electron trapping ability. The introduction of sulfur adjusts the amount of Ov and Co3+/Co2+ ratio. Ov acts as an active site for trapping H2O and activating H2O to generate a proton for the N2 reduction reaction. Active atoms Co3+ were exposed and activated for N2, and electrons hopping between Co2+ and Co3+ enhanced electron transfer. CoTiOS-3 with appropriate Co/S doping has abundant Ov, suitable heterovalent Co3+/Co2+ ratios, higher surface active sites, smaller crystal sizes, higher specific surface area (SBET), and fast transfer of electrons, and it exhibited a super PNRR activity of 491.56 μmol g−1 h−1, an apparent quantum efficiency (AQE) of 1.89% at 420 nm and a solar-to-ammonia (STA) conversion efficiency of 0.083% in pure water under AM1.5G light irradiation. It also exhibited excellent stability and persistence and shows potential for photocatalytic nitrogen fixation.
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