Journal of Physical Chemistry C
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2021
·
IF 4.126
Lijun Ban,Haitao Li,Yin Zhang,Ruifang Wu,Xin Huang,Jianghong Zhao,Yongxiang Zhao
As more technologies have been developed to produce formaldehyde and acetylene from biomass, the condensation–addition reaction between formaldehyde and acetylene provides a green and atom-economic method to synthesize 1,4-butynediol (BD). It is important to design and construct a new efficient copper-based catalyst for formaldehyde ethynylation with multi-center synergy to improve the reaction efficiency. In this work, a CuO–xZnO composite catalyst with an interface structure was constructed. Compared with a CuO-based catalyst, the yield of BD was increased from 19.07 to 70.9% by introducing an appropriate amount of ZnO, and the reaction activation energy decreased from 28.94 to 16.35 kJ/mol, which improved the catalytic reaction efficiency. The results showed that ZnO in the CuO–xZnO catalyst dispersed the active Cu species and also promoted the conversion of CuO to copper acetylide by electron transfer in the interface structure. Moreover, Zn2+ in ZnO acted as a Lewis acid and adsorbed the carbonyl oxygen of formaldehyde, causing the carbonyl electrons to flow to Zn2+, which enhanced the electropositivity of C+ in the formaldehyde molecule. This resulted in a nucleophilic addition reaction between formaldehyde activated by ZnO and acetylene activated by copper acetylide at the interface, which efficiently generated the target product BD.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Shanshan Xu,Hongliang Huang,Xiangyu Guo,Zhihua Qiao,Chongli Zhong
Application of metal-organic frameworks (MOFs) in the field of gas separation has been widely explored, however most of the reported MOFs are sensitive to hydrolysis, restricting their applications under practical environments. In this work, Cu-BTC with distinguishing high resistance to hydrolysis was prepared through in-situ functionalization with sodium citrate (SC). The obtained Cu-BTC-SC can hold its structure integrity and preserve its original gas adsorption capacity even after 10 days' immersion in water. On this basis, mixed matrix membranes (MMMs) containing different loadings of Cu-BTC-SC in Pebax® 1657 were fabricated and applied for CO 2 /N 2 and CO 2 /CH 4 separation under humid conditions. The MMMs displayed excellent long-term stability towards humidified test conditions as well as improved CO 2 separation performance compared with the pristine Pebax® 1657 membrane. Specifically, the membrane incorporated with 15 wt% of Cu-BTC-SC demonstrated a CO 2 permeance of 1102.5 GPU together with a CO 2 /N 2 selectivity of 54.8 for the CO 2 /N 2 mixed gas, and a CO 2 permeance of 1069.6 GPU together with a CO 2 /CH 4 selectivity of 32.5 for the CO 2 /CH 4 mixed gas, surpassing the Robeson upper bounds for CO 2 /N 2 and CO 2 /CH 4 separation. These results demonstrate a potential effective strategy for improving the water stability of MOFs and suggest a promising candidate for the fabrication of high performance membranes for practical large-scale CO 2 separation applications.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Wenlong Zhang,Bin Yang,Jingquan Liu,Xiang Chen,Xiaolin Wang,Chunsheng Yang
In order to improve the sensitivity and reduce working temperature of tin oxide sensor, two elements of copper, zinc doped tin oxide gas sensor has been successfully synthesized using one-step hydrothermal method. During the preparation process, the common zinc acetate and cupric chloride were adopted as copper, zinc source, respectively. The morphology and structure of the as-prepared sample were further characterized using X-ray diffraction (XRD), energy dispersive spectrometry (EDS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and ASAP 2460 (used for mesoporous distribution analysis). It’s found that octahedral nanoparticle enclosed by (221) high energy crystal facet had been prepared. The results also demonstrated that the as-prepared tin oxide doped by copper, zinc elements was single crystal structure of tetragonal system and the size of the crystalline grain was about 50 nm. During the gas sensing performance experiments, the sample’s gas-sensing properties have been proved to be greatly enhanced in sensitivity and working temperature. The response value to 50 ppm ethanol at 110 °C of the sample was increased to 210 that was almost 10 times higher than reported values. Besides, the optimal working temperature was decreased to be 110 °C from reported 350 °C.
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JOURNAL OF CHEMICAL RESEARCH
·
2018
·
IF 0.668
Xiaoyun Ma,Daqin He,Zhengjian Chen
A simple method for the preparation of nitriles in moderate to good yield has been achieved by treatment of aromatic and heterocyclic aldoximes with malononitrile in water at reflux in the presence of copper acetate as catalyst. Arylaldoximes with an electron-donating group showed the highest reactivity, their conversion being achievable at room temperature.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 11
·1-8
·
IF 2.127
Sui Ning,Wang Ke,Bai Qiang,Wang Lina,Wang Tao,Xiao Hailian,Liu Manhong,Colvin Vicki L.,Zhang Qingbo,Yu William W.
Dendritic Pt–Cu nanoparticles were synthesized by a facile one-step method with the help of surfactant Brij58 at room temperature, and we also studied the effects of different Pt–Cu ratios on the morphology and size of nanoparticles. In addition, we further tuned the morphology of the Pt–Cu nanostructures by introducing bromide ions, eventually leading to the appearance of some tripod-like structures. Compared with dendritic Pt–Cu and commercial Pt black, these tripod-like Pt–Cu nanostructures exhibited higher electrocatalytic activity and CO tolerance for catalyzing methanol oxidation.
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APPLIED CLAY SCIENCE
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2016
·
IF 2.586
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
A new eco-friendly hybrid Mg, Al-silicate adsorbent with superior adsorption properties for Cu(II) was prepared by a one-step hydrothermal process using earth-abundant low-grade palygorskite (PAL) as the starting materials and non-toxic sodium carbonate as the assistant. The structural characterizations by scanning electronic microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), BET adsorption-desorption isotherms and Zeta potential analyses confirm that part of rod-like PAL crystals were in-situ transformed as smectite sheets, and the hybrid silicate adsorbents with rod/sheet transition formulation were formed. Under the action of alkaline, some inert Si O Si(or M) bonds were broken as –Si–O − groups, which not only make the adsorbent having extremely negative surface charge (− 46.4 mV), but also strengthen the chelating and holding capability of the adsorbent to Cu(II). The silicate adsorbent shows high adsorption capacity of 229.9 mg/g for Cu(II), which can capture 98.95% of Cu(II) from 200 mg/L of Cu(II) solution at the dosage of 2.6 g/L (only 64.5% for raw PAL). The intensified electrostatic attraction , ion-exchange, and chemical association of Si-O − surface groups with Cu(II) primarily contribute to the improved capture capability for Cu(II).
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 13
·18562-18572
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IF 4.672
Bo Tang,Hefei Fan,Qianfeng Liu,Qiang Zhang,Min Liu,Erdong Wang
Summary Aqueous zinc batteries (AZBs) hold great promise for advancing applications in next-generation energy storage devices because of their high safety, high energy density, and low cost. However, zinc metal anodes have greatly impeded the application in AZBs due to their poor cycle performance. Short lifespan, which is caused by dendritic growth, deformation, corrosion, and competing hydrogen evolution, is very tricky. Herein, a stable Sn@Cu foam, prepared by plating tin on copper foam, is reported as the substrate of Zn anodes. We evaluate the quality of plating tin layers, which are prepared by using different tin salt solutions, and Na 2 SnO 3 solution is eventually selected. Electrochemical tests show that Sn@Cu foam can not only inherit the merits of Cu foam but also suppress hydrogen evolution reaction and lower the initial heterogeneous nucleation barrier of deposited Zn. Moreover, in situ observation by optical microscope demonstrates that Zn dendrite growth on Sn layer is suppressed during the plating-stripping process. As a result, a compact Zn layer on Sn@Cu foam is obtained (Zn/Sn@Cu foam), symmetrical cells display superior cycling life of 1800 h at 1 mA cm −2 for 1 mAh cm −2 , and full cells with VO 2 cathode deliver remarkably better cycling stability and longer lifespan.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Xiaopeng Han,Ying Huang,Qiao Gao,Rui Fan,Xuanyi Peng
NT@Cu and Ag@GF supported the aluminum (Al) composites had been synthesized by vacuum gas pressure infiltration and their microstructure, Coefficient of thermal expansion (CTE), thermal and mechanical properties were investigated. Cu particles encapsulated with NT had been designed to improve the dispersion of NT and form a carbon conductive network. The chemical plating process was used to enhance the wettability between graphite flakes (GF) and Al matrix and eliminate the harmful interfacial reactions. The composites of NT3 had displayed excellent in-plane thermal conductivity (TC) of 378.48 W/mK and stable CTE in high temperature application environment. What's more, the bending strength had been enhanced to approximately 85.15 Mpa. In this study, the innovative way can be applied to fabricate NT@Cu/Ag@GF/Al composites.
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 20
·3703-3710
·
IF 3.849
Qingshuang Liang,Keke Huang,Xiaoru Ren,Wei Zhang,Renguo Xie,Shouhua Feng
In this work, Cu–Sb–S nanocrystals (NCs) with various compositions and crystal structures are realized by only tuning the amount of 1-dodecanethiol (DDT). When the DDT amount is 3.6, 5.5, 20.5, and 25.6 mmol, pure tetragonal Cu3SbS4, cubic Cu12Sb4S13, orthorhombic CuSbS2, and orthorhombic Cu3SbS3 NCs are respectively obtained. Systematic investigations demonstrate that different amounts of DDT are responsible for formation of the different compositions and crystal structures of the initial Cu2−xS seeds, which results into the formation of various Cu–Sb–S NCs. This reaction path is further verified by control experiments from successful preparation of Cu–Sb–S NCs comparable to that of the as-prepared ones directly from the reaction of Sb2S3 NCs with Cu2−xS seeds. The current study not only provides a facile and economical way to synthesize high-quality Cu–Sb–S NCs, but also opens a new route for preparation other I–V–VI multicomponent chalcogenides NCs, such as Cu–Bi–S systems.
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Nano Research
·
2018
·Vol. 11
·期 5
·2612-2624
·
IF 7.994
Gao Daowei,Li Shuna,Song Guolong,Zha Pengfei,Li Cuncheng,Wei Qin,Lv Yipin,Chen Guozhu
Shape-controlled synthesis of Pt−Cu alloy nanocrystals (NCs) with unique geometries is of great importance in the rational design and deterministic synthesis of highly active electrocatalysts. Herein, Pt−Cu alloy NCs with concave octahedron (COH), porous octahedron (POH), yolk–shell (YSH), and nanoflower (NOF) structures were fabricated by altering the sequential reduction kinetics in a one-pot aqueous phase. The effect of the reaction kinetics on the formation of Pt−Cu bimetallic NCs with different morphologies was analyzed quantitatively. The concentrations of glycine and metal cation are demonstrated to play a key role in the reduction of Pt(IV) and Cu(II) ions; these significantly affected the morphology of Pt−Cu NCs. These Pt−Cu alloy NCs exhibit substantially enhanced catalytic activity and durability for methanol and formic acid oxidation compared to the commercial Pt/C catalyst. Specifically, the COH and NOF Pt−Cu NCs with more step atoms, intragranular dislocations, and protrusions showed superior electrochemical properties than those of POH and YSH Pt−Cu NCs. The structure–property relationship between the Pt−Cu NCs and their electrochemical performances was also investigated in depth.
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Catalysts
·
2022
·Vol. 12
·期 4
·426
·
IF 4.501
Jinyun Liao,Yujie Wu,Yufa Feng,Haotao Hu,Lixuan Zhang,Jingchun Qiu,Junhao Li,Quanbing Liu,Hao Li
Promoting the activity of heterogeneous catalysts in the hydrolysis of ammonia borane for hydrogen production is still a challenging topic for researchers in the hydrogen energy and catalysis fields. Herein, we present a universal, simple and efficient strategy to boost the catalytic performance toward AB hydrolysis by mixing Co- and Cu-based catalysts for the first time. Synergistic catalysts with remarkably enhanced activity can be obtained by mixing a Co-based catalyst and a Cu-based catalyst together, such as Co3O4and Cu3(MoO4)2(OH)2, Co3O4and Cu3(PO4)2,Co3(PO4)2and Cu3(MoO4)2(OH)2, Co3(PO4)2and Cu3(PO4)2, and CuO and Co3O4. For example, the turnover frequency (TOF) for the mixture catalyst of Co3O4and Cu3(MoO4)2(OH)2with a mass ratio of 4:1 is up to 77.3 min−1, which is approximately 11.5 times higher than that of the sum of Co3O4and Cu3(MoO4)2(OH)2. The reasons for these findings are discussed in detail. The observations and conclusions in this work may provide a guideline for promoting the hydrolysis of ammonia borane through a simple and effective approach.
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Catalysis Science & Technology
·
2019
·Vol. 10
·期 5
·1248-1255
·
IF 5.726
Lei Wang,Yang Wang,Chang-Wu Zhang,Jing Wen,Xuefei Weng,Lei Shi
Minimizing the use of platinum while maximizing its catalytic activity is attractive but challenging in the development of industrially important platinum catalysts. Herein, using a hexagonal boron nitride (h-BN) nanosheet-supported Pt/Cu cluster catalyst, we report the promotion of the platinum utilization efficiency and catalytic performance for the dehydrogenation of propane. Specifically, as little as 100 ppm platinum exhibits high propane conversion (∼15%) and propylene selectivity (>99%) at a relatively low reaction temperature (520 °C); the formation rate of propylene reaches 7.3 mol molPt−1 s−1, which is about 10 times higher than the best value for the reported Pt/Cu single-atom alloy catalyst. The structural analysis reveals that the abundant fault edges of the h-BN nanosheets and strong bonding of copper with the edge B–O defects maintain the unique geometry of the Pt/Cu cluster, together with the metallic platinum ensemble stabilizing on the top layer of the copper cluster, leading to remarkable improvement in catalytic efficiency. This prominent promotion in catalytic efficiency is also exemplified using other supports including Al2O3, SBA-15 and SiC as counterparts.
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