POLYMER SCIENCE SERIES A
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2018
·Vol. 60
·期 5
·612-617
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IF 0.729
Wang Jinjing,Wang Huifeng,Li Yan,Tian Li,Chen Shanmin,Liu Qiang,Guo Zhen
A novel copolymer surfactant has been prepared via a free radical copolymerization of CO 2 -switchable monomer N , N -diethylaminoethyl methacrylate and the hydrophilic monomer sodium vinyl-sulfonate and characterized. The results of conductivity, dynamic light scattering and cryogenic transmission electron microscopy study showed the change of the microstructure of copolymer in water by adding or removing of CO 2 . The copolymer aqueous solution was found to exhibit reversible switchability by the bubbling of CO 2 /N 2 .
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3829-3838
·
IF 2.3
Wang Mingyue,Li Ting,Tian Yuhao,Zhang Jiarong,Cai Weijie
To develop high-performance catalysts for greenhouse gas CO 2 reforming with ethanol (EDR) is progressively inspired by the urgent requirement of CO 2 elimination in order to meet with the sustainable development. In this work, the bimetallic Co(Ni)/ZnO catalyst derived from MOFs was investigated in detail with a focus on the effect of Ni dopant. The EDR results indicated that the bimetallic Co(Ni)/ZnO catalyst presented better activity as well as less formation of byproducts in comparison with the monometallic Co/ZnO catalyst. 100% of ethanol conversion was obtained at 500 °C for Co(Ni)/ZnO versus 650 °C for Co/ZnO. Moreover, no acetone formation was observed over Co(Ni)/ZnO catalyst while the concentration of acetone in Co/ZnO was as high as 10 mol%. Characterization results depicted that the strong synergistic effect between Ni and Co in Co(Ni)/ZnO catalyst might greatly stabilize active metal cobalt with smaller particle size, improve the reducibility and facilitate the generation of oxygen defects, thereby enhancing the catalytic performance. To a certain extent, this work might contribute to the design of efficient catalysts for other catalytic applications. Graphical
研究领域:
催化
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环境化学
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材料科学
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绿色化学
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能量转换
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Zhen Liu,Wenji Zheng,Ziheng Li,Yan Dai,Xiaobin Jiang,Xiujuan Zhang,Xuehua Ruan,Xuemei Wu,Gaohong He
Polyethylene glycol dimethyl ether (PEGDME) is proposed to incorporate into PTMSP fibers to prepare an electrospun fiber composite membrane (EFCM) to break the trade-off limit. The abundant ether-oxygen groups in PEGDME can enhance CO2 affinity, improving its selective permeation. Meanwhile, PEGDME has a similar chemical structure with the pore-filled polymer PEO, resulting in intensified interfacial affinity between PTMSP fibers and PEO. Moreover, the high permeability and continuous structure of PTMSP fibers can provide a fast transmission channel for CO2, leading to elevated CO2 permeability. The EFCM exhibits a dense and defect-free structure with fibers distributed uniformly in PEO. The CO2 separation performance increases with the increase in the PEGDME content, and EFCM-30 presents the best CO2/N2 selectivity of 45.46 and CO2 permeability of 753 Barrer, which are increased by 31.5 and 58.5%, respectively, in comparison with EFCM-0. This excellent performance exceeds the 2008 Robeson upper bound.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 16
·11595-11606
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IF 2.993
Wu Keliang,Dong Xuejun,Zhu Junfang,Wu Pengcheng,Liu Chang,Wang Yixi,Wu Jianning,Hou Juan,Liu Zhiyong,Guo Xuhong
The nanostructured heterojunction photocatalysts are considered promising in photocatalytic reduction in the carbon dioxide. Herein, we demonstrate a simple sol–gel and hydrolysis process to design nanostructured TiO 2 /ZnO heterojunction, by using the biological template celery stalk. The nanostructured photocatalyst consists of anatase TiO 2 and wurtzite ZnO nanoparticles. A well-connected heterojunction, with uniformly distributed nanoparticles, on the pores and folds of celery stems, is obtained. The enhanced specific surface area of 55.5 m 2 /g is achieved. The crystal structure, morphology and surface composition are investigated by electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Furthermore, we demonstrate the photocatalytic performance of as-synthesized nanostructure TiO 2 /ZnO heterojunction. The photocatalytic yield, of CO 2 reduction into CH 4 , exhibits a five times increase, from 0.55 to 2.56 µmol h −1 g −1 , for the nanocomposite as compared to the pure TiO 2 . This enhanced performance corresponds to the efficient charge transfer and hindrance in the recombination of electron–hole pairs due to the optimum band positions of ZnO and TiO 2 . This study demonstrates the potential of using biotemplates to design efficient photocatalysts to convert CO 2 into useful solar fuels.
研究领域:
材料科学
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环境科学
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纳米技术
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光催化
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可持续能源
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Weize Yang,Jianzhong Zheng,Shirong Hu,Wuxiang Zhang,Chan Wei,Peihui Dong,Yaru Yan,Haixia Hu
Three-dimensional (3D) Co2(OH)3Cl-MnO2 hybrid sphere was first obtained through a facile solvothermal microwave-assisted synthesis method. Because of the 3D sphere structure with a flowerlike morphology built up by nanosheets, this type of hybrid accelerated ion transfer as well as the charge and simultaneously maximized the electroactivity of Co2(OH)3Cl or MnO2 with a high capacitance of 942.2 F g–1, which was greater than that of the single Co2(OH)3Cl or MnO2. Meanwhile, an asymmetric supercapacitor device was assembled with the hybrid and active carbon (AC) as the positive and negative electrodes, which yielded a specific capacitance of 49.26 F g–1 and a high energy density of 12.62 Wh kg–1 at a power density of 679.10 W kg–1. In addition, the capacitance of this device retained 83.77% after 5000 cycles, which showed a well-defined, long cycle life.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
MATERIALS SCIENCE FORUM
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2024
·
IF 0
Ya Ya Wang,Xin Jin
To alleviate the environmental problems caused by the excessive emission of CO2, this study designed and synthesized a binary organocatalytic system based on urea-based hydrogen bond donors and polyether ionic liquids based on a cycloaddition reaction that converts CO2 and small-molecule epoxides into cyclic carbonates with high industrial application value. The binary system is based on a polyether ionic liquid, introducing an organic base (to trap and activate CO2), hydrogen bond donor (to activate the epoxide), and nucleophilic reagent unit (to help open the ring of epoxides), with a variety of active sites. In this paper, the effects of the hydrogen bond donor as well as polyether ionic liquids structure on the activity of the binary system were investigated, the optimal HBD/Lewis base binary catalytic system was established, and the cycle life of this binary system was tested.
研究领域:
化学
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环境科学
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催化材料
✓ 已验证
DOI
CATALYSIS TODAY
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2022
·
IF 6.562
Xiaowen Su,Shan Wu,Xiaoxing Long,Yan Shi,Qi Pan,Jixin Su
Preventing climate change and achieving carbon neutralization depend on strengthening the carbon cycle in industry and limiting carbon emissions to ambient air. Our aim is to reduce CO 2 to valuable CO by gas-solid photo-catalytic reduction under sunlight. We prepared catalysts by one-step synthesis with graphene oxide (GO) and ZnO, surface modified with a monolayer of sulfonated cobalt phthalocyanine (CoPcS), which were calcined to obtain photocatalyst samples containing Co(II), ZnO and reduced graphene oxide (rGO). Results of TEM, SEM-EDS, XRD, XPS, PL and ESR revealed that the photocatalyst samples possessed a hybrid layer microstructure, heterojunction, and excellent electron-hole pair separation. Evaluation of the photocatalytic reduction reactivity showed that CO selectivity reached 96.2–99.0% and top CO yield was 26.15 µmol.g −1 .h −1 .
研究领域:
环境科学
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材料科学
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化学工程
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光化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Yafei Guo,Changhai Li,Shouxiang Lu,Chuanwen Zhao
K 2 CO 3 supported on activated carbon (K 2 CO 3 /AC) shows promise as a potential candidate for removing low-concentration CO 2 from environmental control and life support systems (ECLSS). However, K 2 CO 3 /AC would suffer a decreased CO 2 sorption capacity due to sorbent deactivation in acid impurities such as SO 2 and NO 2 . To solve this problem, water vapor pretreatment, KOH addition and polyethyleneimine (PEI) modification were proposed as efficacious means for improving its CO 2 sorption capacity and mitigating the sorbent deactivation in these acid impurities. CO 2 sorption performances of the pretreated and modified sorbents were evaluated in a fixed-bed reactor under simulated ECLSS conditions of 20 °C, 1.0% CO 2 , 2.0% H 2 O, 30 ppm SO 2 , 20 ppm NO 2 and balanced N 2 . The mechanisms for sorbent deactivation inhibition by water vapor pretreatment, KOH addition and PEI modification were revealed by N 2 adsorption-desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FT-IR). Effects of water vapor pretreatment duration, KOH addition and PEI loading on sorbent deactivation inhibition performances were demonstrated. Furthermore, the long-term working stabilities of the pretreated and modified sorbents in impurities were evaluated. The results will provide fundamental support on practical application of K 2 CO 3 /AC for low-concentration CO 2 removal in ECLSS.
研究领域:
环境控制与生命支持系统
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气体吸附
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材料化学
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空气净化技术
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二氧化碳捕集
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Zhong Changyin,Yang Yifei,Chen Jun,Feng Bomin,Wang Hongbing,Yao Yunxi
CO 2 methanation is regarded as an efficient method for upgrading CO 2 to fuels and reducing environmental impacts of greenhouse gas emission. In this study, we developed Ni/ La 2 O 2 CO 3 low temperature CO 2 methanation catalysts by tuning the metal-support interaction via changing the morphology of catalyst supports. La 2 O 2 CO 3 supports with various morphologies including nanotriangles (La 2 O 2 CO 3 -T), nanorods (La 2 O 2 CO 3 -R), and nanoparticles (La 2 O 2 CO 3 -P), were synthesized as the supports of Ni catalysts for CO 2 methanation reaction. The CO 2 methanation performance of the synthesized Ni/La 2 O 2 CO 3 catalysts was found to be markedly superior to that of conventional Ni/SiO 2 catalysts with the following orders: Ni/La 2 O 2 CO 3 -T > Ni/La 2 O 2 CO 3 -R > Ni/La 2 O 2 CO 3 -P > Ni/SiO 2 . In the comparative characterization of Ni/La 2 O 2 CO 3 catalysts with various morphologies, TEM and H 2 -TPR results reveal that the Ni/La 2 O 2 CO 3 -T catalysts exhibit better dispersion of Ni nanoparticles and higher reducibility. Moreover, X-ray photoelectron spectroscopy (XPS), O 2 and H 2 temperature programmed desorption (O 2 -TPD, H 2 -TPD) results indicate that the Ni/La 2 O 2 CO 3 -T catalysts possess a lower oxygen vacancy formation energy leading to a higher concentration of interfacial oxygen vacancies, which enhances the adsorption hydrogen at these interfacial oxygen vacancy sites. CO 2 -TPD results further reveal that Ni/La 2 O 2 CO 3 -T catalysts own higher concentration of medium basic sites, which promote the adsorption and activation of CO 2 . Consequently, Ni/La 2 O 2 CO 3 -T catalysts demonstrate superior low-temperature CO 2 methanation activity by hydrogenation of CO 2 adsorbed as surface carbonates on the La 2 O 2 CO 3 surfaces with hydrogen spilled over from the Ni surfaces via the interfacial oxygen vacancies to the catalyst support. Graphical Abstract
研究领域:
催化
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材料科学
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环境化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 23
·期 3
·2005-2014
·
IF 3.43
Haibin Gou,Xifei Ma,Qian Su,Lei Liu,Ting Ying,Wei Qian,Li Dong,Weiguo Cheng
The development of metal-free, high effective and recyclable catalysts plays a pivotal role in transforming CO2 into high value-added products such as cyclic carbonates. In this paper, we introduced the hydrogen bond donor (HBD) groups into poly(ionic liquid)s via free radical polymerization, which successfully combined the HBD and ionic liquids (ILs) into one heterogeneous catalyst. The HBD could synergistically activate epoxides with hydroxyl functionalized ionic liquids and efficiently catalyze the cycloaddition of CO2 into cyclic carbonates. The yield of propylene carbonate (PC) reached 94% (at 105 °C, 2 MPa CO2, 3 h), which far exceeded poly(ionic liquid)s without HBDs functionalization (PC yield 72%), and even approached bulk ionic liquids (PC yield 95%). Moreover, HBD-functionalized poly(ionic liquid)s (HPILs) exhibited excellent recyclability after five runs and afforded wide substrate scope. According to the experimental results, 1H NMR spectra and density functional theory (DFT) calculations showed 2-hydroxyethyl methacrylate (HEMA) and the hydroxyl of ILs would form strong H-bonds with epoxides contributing to the ring-opening process of epoxides, and a possible HBD and nucleophilic anion synergistically catalytic mechanism was proposed. The method herein paved a brand new way for green technology and utilization of poly(ionic liquid)s.
研究领域:
材料科学
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化学工程
·
催化
·
绿色化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Longkai Pan,Minggang Zhang,Hui Mei,Li Yao,Zhipeng Jin,Hongxia Liu,Shixiang Zhou,Ziyi Yao,Gangqiang Zhu,Laifei Cheng,Litong Zhang
Use of 3D photocatalytic reactor has been widely explored for development of efficient photocatalytic systems. In the present study, a bionic palisade cells BiOBr/Sr 2 Nb 2 O 7 /Al 6 Si 2 O 13 photocatalytic reactor with high strength was prepared through combination of 3D printing technology and solvothermal method. The carefully designed and optimized bionic palisade cell structure exhibited a periodic porous structure with high surface area. The controllable periodic structure effectively regulated the internal photon transfer and mass transfer. Photon transfer ensured that light is fully scattered within the structure, which improved light utilization. High mass transfer ensured smooth flow of reactant inside the structure, which increased reactant adsorption on the surface of photocatalysts. The interface electric field of the BiOBr/Sr 2 Nb 2 O 7 p-n heterojunction effectively separated the photogenerated electrons and holes. The BOB/SNO/ASO structure had high photocatalytic CO 2 reduction performance under the simulated sunlight. The CO yield for the reaction was 13.68 μmol/g/h, whereas that of CH 4 yield was 6.37 μmol/g/h. Therefore, the findings of the present study provide a basis for design and preparation of high-performance 3D photocatalytic reactors.
研究领域:
材料科学
·
环境科学
·
化学工程
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Changfan Xu,Huanwei Wang,Jing Zhan,Yao Kang,Feng Liang
Designing catalytic cathodes with excellent electrocatalytic activities and durability for Na-CO 2 batteries has captured considerable attention so far. Here, a series of morphologically controlled low-crystalline CuCo 2 O 4 was prepared by thermal oxidation of self-assembled Cu-Co precursors ( p -CCO). One-dimensional (1D) rod-like of CuCo 2 O 4 was subsequently encapsulated in polypyrrole shell (PPy) by in-situ polymerization of pyrrole monomers as an advanced catalyst (CCO/PPy) for high-performance Na-CO 2 batteries . It was demonstrated that ammonia solution exerts an important influence on the surface morphology and size of the p -CCO crystallites by the rate of nucleation and growth. Particle size and 1D architecture modulation, associated with the encapsulation of conductive PPy effectively improve the directional transfer rate of ions and the conductivity of the electrode. More importantly, PPy introduction not only induces interfacial reconstruction of CuCo 2 O 4 , arousing more oxygen vacancies and catalytic active sites, but also contributes to the corrosion protection of the active material from the electrolyte during long-term operation. Bestowed by these advantages, the fabricated hybrid Na-CO 2 battery manifested prominent electrochemical performance with a superior areal discharge capacity of 31.3 mAh cm −2 , low discharge-charge voltage gap of 0.6 V, over 400 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）