APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Mingxin Lv,Liyuan Huai,Guoxin Chen,Xi Zhao,Chunlin Chen,Shenghu Zhou,Jian Zhang
Controlling the selective activation of one or some functional groups as desired is still a challenge in hydrogenation, especially at high substrate concentrations. Herein, Pd-MgO interfaces over Al 2 O 3 were finely regulated for efficiently selective hydrogenation of furan ring in 5-hydroxymethylfurfural (HMF) to produce 5-hydroxymethyltetrahydro-2-furaldehyde (5-HMTHFF) or total hydrogenation to 2,5-bis(hydroxymethyl)tetrahydrofuran (BHMTHF), also inhibiting side reaction. The Pd-MgO/Al 2 O 3 with 12.0 wt% of MgO selectively hydrogenates the furan rings with a 5-HMTHFF yield of 82.4 % while that with 2.0 wt% of MgO totally hydrogenates HMF with a DHMTHF yield of 96.2 % at high substrate concentrations (400 mM). Characterizations and DFT calculations demonstrated that oligomeric MgO species suppress the agglomeration of Pd nanoparticles and strengthen HMF adsorption, consequently promoting total hydrogenation. Furthermore, Pd δ+ -MgO 1-x sites between the crystallized MgO and Pd metal favored tilted adsorption on the interface and weakened the activation of the C O bond, consequently selectively producing 5-HMTHFF.
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DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Fangqian Han,Liu Qian,Qianru Wu,Dong Li,Shulan Hao,Lihu Feng,Liantao Xin,Tao Yang,Jin Zhang,Maoshuai He
A SiC supported iron (Fe–SiC) catalyst was developed for chemical vapor deposition (CVD) growth of carbon nanotubes. Using CO as the carbon source, sole Fe–SiC catalyst was mostly inactive for synthesizing carbon nanotubes and only trace amount of carbon deposits was produced. In contrast, the powder Fe–SiC catalyst could be activated by pressing them onto a flat SiO 2 substrate or by mixing them with porous MgO powders. Particularly, efficient growth of single-walled carbon nanotubes (SWNTs) was achieved on porous MgO promoted Fe–SiC catalyst, and predominant synthesis of (6, 5) SWNTs was realized at a reaction temperature of 650 °C. Systematic characterizations revealed that the reducibility of the Fe–SiC catalyst was enhanced by the physical contact with oxide support, which promotes the formation of small active Fe nanoparticles for the subsequent SWNT nucleation and growth. This work not only deepens our understandings to the catalyst activation mechanisms, but also helps design composite catalyst for synthesizing SWNTs.
研究领域:
材料科学
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纳米技术
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化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Meijie Cai,Shisheng Liu,Junjie Cai,Lei Zhao,Xiaohui Wei,Minjie Guo,Song Lin
A combination microwave-assisted hydrothermal and calcination method was used to produce serial mesoporous [email protected] ( [email protected] ) hybrid nanocomposites, which were studied and validated by TEM, XPS, XRD, and Raman spectra . The calcined [email protected] nanocomposites have a high specific surface area and small grain sizes with an enhanced capacity to degrade paraoxon after optimal preparation. The optimal [email protected] nanocomposites was obtained by the calcining temperature at 600 °C, and the particle size was about 6.4 ± 2 nm with a higher specific surface area of 255.6 m 2 /g. At room temperature, the decomposed amount of paraoxon toxins by [email protected] is ca. 55.65 mg/ [email protected] min. Furthermore, the pseudo-second-order kinetic model (R 2 > 0.99) fits the experimental degradation data better. The enhanced degradation effect of [email protected] was verified due to the generations of more superoxide radical (·O 2 - ) and hydroxyl radical (·OH) active sites. A photothermal effect was also observed in the [email protected] sample. The removal efficiency increased 8-fold after being exposed to near-infrared (NIR) radiation at 808 nm compared to the non-irradiating sample. Because of their ease of manufacture, low cost, and high removal effectiveness, [email protected] nanocomposites could be a suitable adsorbent choice for eliminating organophosphorus hazardous contaminants.
研究领域:
材料科学
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环境科学
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纳米技术
·
催化
·
毒理学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2026
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IF 8.2
Yanan Li,Xiang-Xiang Pan,Hui-Yu Zhang,Wan-Ming Li,Changqing Liu,Cheng-Xin Li
Development of a highly conductive interlayer with good multilayer interfacial compatibility is critical for achieving high-performance inert ceramic-supported flat-tubular segmented-in-series solid oxide fuel cells (FT-SIS-SOFCs). In this study, a high-performance MgO-MgAl2O4 (MMA)-supported solid oxide fuel cell is prepared by developing an innovative 70 vol % NiO-30 vol % MgAl2O4 interlayer via a cosintering process. The NiO-MgAl2O4 interlayer effectively suppresses MgO diffusion from the MMA substrate, limiting the diffusion distance to 25 μm. Additionally, the conductivity of the fabricated interlayer exceeds 3400 S cm–1 at the operational temperature. It exhibits excellent cosintering compatibility with the other functional layers. When the thickness of the NiO-MgAl2O4 interlayer is approximately 40 μm, the MMA-supported SOFC single cell shows an open circuit voltage (OCV) of about 1.07 V and a power density of 760 mW cm–2 at 850 °C, as well as excellent long-term stability. Moreover, the 16-cell FT-SIS-SOFCs show an OCV and maximum output power at 850 °C of 17 V and 15 W, respectively.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Na Li,Yaru Peng,Zeng Chen,Wenjuan Xiong,Jiaqi Sun,Yiming Chen,Putao Zhang,Meiyue Liu,Shengjun Li
The electro-deoxidation of MgO does not proceed efficiently due to the electrical insulation properties of MgO and large molar volume of metallic magnesium. In this experiment, an attempt was done to prepare Mg-Zr alloy from their oxides using the method of electro-deoxidation. The electrochemical mechanism of the deoxidation process of MgO, ZrO 2 and MgO-ZrO 2 composite was studied through cyclic voltammetry using metallic cavity electrode (MCE). There was an intermediate phase (Zr 3 O) in the reduction process of ZrO 2 . The electro-deoxidation of MgO occurred for MgO-ZrO 2 composite in CaCl 2 -NaCl molten salt. Moreover, the electro-deoxidation of MgO was promoted by the addition of polyvinyl butyral (PVB). The formation of metal phase Mg was confirmed by XRD, EDS, Raman spectroscopy, and inductively-coupled plasma spectroscopy. The electro-deoxidation products showed significant differences with the concentration of PVB and the ratio between MgO and ZrO 2 . The electro-deoxidation of MgO and ZrO 2 was favorable when the PVB concentration was 5.0% (wt.%). Pure metal phase of Mg-Zr alloys was formed when the molar ratio of MgO and ZrO 2 was 1:2. The atomic fraction of Mg in the electrolytic product was ca. 28.0 mol.%. This work shows that MgO could be directly electro-deoxidized to Mg without the formation of intermediate phase oxide.
研究领域:
材料科学
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冶金工程
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无机化学
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电化学
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金属合金制备
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 1
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IF 1.768
Yao Zhou,Jinliang He,Jun Hu,Bin Dang
Polypropylene (PP)/polyolefin elastomer (POE) blends and MgO/PP/POE nanocomposites were fabricated by melt blending. The morphology, mechanical, and electrical properties of the nanocomposites were investigated. Scanning electron microscopy showed that the surface-modified MgO nanoparticles were well dispersed in the polymer matrix at low loadings of less than 3 phr. X-ray diffraction demonstrated that the crystalline phases of PP in the composites were changed and that the β phase significantly increased. An examination of the electrical properties revealed that the direct-current (dc) electric breakdown strength and space-charge suppression effect were remarkably improved by the introduction of the surface-modified MgO nanoparticles. In addition, obvious enhancements in the tensile modulus and strength were obtained as a result of the synergistic toughening of the POE and MgO nanoparticles. Thus, MgO/PP/POE nanocomposites with enhanced mechanical and electrical properties have great potential to be used as recyclable insulation materials for high-voltage dc cables with large transmission capacities and high operating temperatures. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42863.
研究领域:
高分子材料科学
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电气工程材料
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纳米复合材料
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介电物理
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绝缘材料
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2016
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IF 5.393
Qiancheng Zhu,Shibi Zeng,Ying Yu
Nowadays, capturing anthropogenic CO2 in a highly efficient and cost-effective way is one of the most challenging issues. Herein, the key parameters to stabilize CO2 uptake capacity have been studied based on four kinds of pure calcium oxides (CaO) prepared by a simple calcination method with four different calcium precursors. A simple ideal particle model was proposed to illustrate the uniform distribution of pure CaO, in which the CO2 uptake capacity is positively related with surface area of CaO particles and the stability is opposite to the distance between two CaO particles after carbonation. The adsorption capacity of the best sample with a distance of 398 nm between two CaO particles after carbonation only lost 0.344% per cycle, which is originated from the low possibility of the agglomeration between neighboring particles. On the basis of the proposed model, the composite with magnesium oxide (MgO) distributed uniformly in CaO was fabricated by a simple ball milling method, which possessed an excellent stability with a decay rate of only 3.9% over 100 carbonation–calcination cycles. In this case, MgO played as inert to increase the distance between CaO particles for agglomeration prevention.
研究领域:
碳捕集与封存
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材料科学
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化学工程
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可持续能源
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DOI
高影响因子
Catalysis Science & Technology
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2026
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IF 4
Muqiu Liu,Chenghu Wei,Rui Tu,Keran Lv,Junxia Yang,Tie Yu
This study reports a ternary dual-function material (DFM) prepared via a facile mechanochemical strategy for integrated in situ CO2 capture and methanation at 250 °C, and reveals the role of mechanical ball milling in regulating morphology and optimizing the catalytic reaction pathway. MgO–Co–TiO2 composite was directly constructed via mechanochemical ball milling at 800 rpm, without additional loading or calcination steps. The ball milling process promotes homogeneous mixing of the components and the formation of three-phase interfaces. At 250 °C, the system achieved an H2 conversion of 68.52% under mechanical vibration, which was significantly higher than that under static conditions, while the mechanical energy consumption accounted for less than 5% of the total energy input. Comprehensive characterization results indicate that mechanochemical ball milling generates abundant surface oxygen defects and enhances interfacial coupling among the components, thereby facilitating the hydrogenation of captured carbonate intermediates. Regarding cyclic stability, , the cyclic stability of the system was significantly improved by implementing a strategy to ensure an excess carbon capacity supply, with H2 conversion remaining stable above 40% over 13 consecutive cycles. The findings indicate that integrating mechanochemical treatment with dual-function materials provides a workable route for intermediate-temperature CO2 capture and methanation, without relying on high-temperature preparation steps.
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 8.8
Ook Choi,Kyungwhan Min,Eun-Kyu Sun,Kavya Adot Veetil,Tae-Hyun Kim
Pressure-resilient facilitated-transport membranes are highly desirable for practical CO 2 capture, yet maintaining efficient CO 2 transport under elevated feed pressures remains a major challenge due to the inherent pressure dependence of facilitated transport. Herein, we report a nanocomposite hollow fiber membrane fabricated by infiltrating poly(1-vinyl imidazolium) (PVI) into a polyimide (Matrimid® 5218) hollow fiber support (outer diameter: 650 μm, inner diameter: 510 μm), followed by the layer-by-layer (LbL) assembly of ionic liquid-functionalized quantum dots (IL-QDs) and modified graphene oxide (mGO) via interfacial polymerization. Thermal trimerization of PVI at 150 °C induces the formation of triazine structures, promoting polymer-chain rearrangement that increases free volume and CO 2 sorption sites, thereby facilitating CO 2 dissolution and diffusion. Simultaneously, the alternating LbL architecture enables IL-QDs to function as nanoscale spacers that suppress irreversible π–π stacking of mGO nanosheets, generating continuous CO 2 -philic transport pathways. Benefiting from these synergistic structural effects, the optimized membrane achieved a CO 2 permeance of 16 GPU and a CO 2 /N 2 selectivity of 112 while exhibiting substantially reduced pressure dependence of separation performance. Furthermore, the membrane maintained stable mixed-gas separation performance and excellent long-term operational stability. This work presents a nanostructure engineering strategy for constructing pressure-resilient facilitated-transport hollow fiber membranes, providing new design insights for practical post-combustion CO 2 capture.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Siyu Tang,Yan Ma,Zhoufu Wang,Hao Liu,Xitang Wang,Nian Yi,Yunjie Dong,Zhongfeng Xia,Chengji Deng,Beiyue Ma,Weidong Fu,Luwei Fu
MgO-CaO ceramic cores are considered promising for precision superalloy casting due to their high melting points, chemical compatibility with molten alloys, and water-assisted removability. However, the difficult sintering and limited mechanical properties hinder their further engineering application. In this work, Y 2 O 3 -Al 2 O 3 composite precursors were synthesized via a low-temperature solid-state route and employed as reactive additives to regulate the densification behavior and grain-boundary chemistry of MgO-CaO ceramics. The effects of Y 2 O 3 /Al 2 O 3 ratio, additive state (direct precursor vs. post-calcined powder), and addition level on the phase evolution, microstructure, densification, flexural strength, and refractoriness were systematically investigated. The results suggested a precursor-directed reactive sintering mechanism with two coupled contributions: At low Y 2 O 3 /Al 2 O 3 ratios, a transient Ca-Al-O-rich liquid associated with Ca 3 Al 2 O 6 promoted mass transport and pore elimination, while at higher ratios, the in-situ precipitation of lamellar CaYAlO 4 at grain boundaries contributed to reconstruct the intergranular network, strengthened interphase bonding, and suppressed grain coarsening via a pinning effect. Due to the balanced densification and grain-boundary stabilization, the optimal sample containing 1.5 mol.% uncalcined precursor with a high Y 2 O 3 /Al 2 O 3 ratio achieved a room-temperature flexural strength of 126.16 MPa and refractoriness of 1698 °C after sintering at 1600 °C for 3 h. As a result, post-calcined additives led to coarser and less interconnected intergranular structures with inferior densification. This work demonstrates that tailoring precursor chemistry provides an effective route to switch and coordinate liquid-assisted densification and CaYAlO 4 -dominated grain-boundary reinforcement, offering a viable strategy for designing high-performance MgO-CaO ceramics potentially used for advanced superalloy casting cores.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Zhaoxia Shi,Zhen Luo,Yilu Liu,Yintang Zhang,Yanli Zhou,Maotian Xu
A synergistic MgO@UiO-66-NH₂ nanocomposite was prepared for CTL sensing. • The proposed CTL sensor enables rapid, non-invasive detection of isopropanol. • The sensor exhibits a wide linear range (0.04–120 mg/L) and good stability. • This method offers a potential approach for preclinical lung cancer screening via exhaled breath analysis. Isopropanol (IPA) has been identified as a potential biomarker for lung cancer, and the rapid detection of IPA in exhaled breath may offer a promising strategy for lung cancer screening. In this study, rod-like MgO, MnO₂, and ZnO, along with natural halloysite nanotubes (HNTs), were synthesized and used as carriers to fabricate nanocomposites with a Zr-based metal–organic framework (UiO-66-NH₂). Their catalytic activities toward IPA were evaluated using cataluminescence (CTL) measurements. MgO@UiO-66-NH₂ exhibited the highest catalytic activity, attributed to the synergistic effect between MgO and UiO-66-NH₂ enhancing the redox capacity in the presence of ozone. Based on this composite, a rapid CTL method was developed for IPA detection in exhaled breath. The intra-sensor precision (nine repeated measurements on the same sensor) gave a relative standard deviation (RSD) of 3.41%; inter-sensor reproducibility (seven different sensors) gave an RSD of 3.81%; and long-term stability over seven weeks showed an RSD of 4.3%. The linear range was 0.04–120 mg/L, with a limit of detection of 0.015 mg/L (S/N = 3). When applied to three healthy human exhaled breath samples, the method achieved spiked recoveries ranging from 90.0% to 105.3%. These results demonstrate that the proposed CTL sensor enables rapid, non-invasive detection of IPA and holds great potential for IPA detection in exhaled breath. Download: Download high-res image (143KB) Download: Download full-size image
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高影响因子
ENERGY & FUELS
·
2026
·
IF 6
Boya Hao,Gang Hou,Zewei Liu,Zeyuan Lei,Chongyi Wang,Bofeng Zhang,RongRong Zhang,Xingjie Wang,Jiafei Lyu,Guozhu Liu
The growing demand for sustainable aviation fuel (SAF) makes extending the carbon chain from ethanol a strategy well worth pursuing. Herein, a series of Ni/MgO@C catalysts derived from Ni/Mg bimetallic metal–organic frameworks (MOFs) was evaluated for the Guerbet coupling of ethanol to higher alcohols within the alcohol-to-jet (ATJ) strategy. Owing to the isolated metal nodes in the periodic framework, highly dispersed Ni species on the magnesium-based solid supports with abundant basic sites have been accessed. The catalyst with a Ni/Mg molar ratio of 0.13 achieved a higher alcohol yield of 55.5% at 88.4% ethanol conversion under 2 MPa N2 at 240 °C for 10 h. Upon extending the reaction to 24 h, C8–C16+ alcohols accounted for 41.4% of the alcohol product pool. Comprehensive catalyst characterization combined with theoretical calculations revealed that the involvement of Ni species can accelerate the dehydrogenation step, while an appropriate Niδ+/Ni0 ratio can be critical for efficient carbon chain elongation by promoting alcohol dehydrogenation to aldehyde and simultaneously suppressing their deep decomposition through weakened interaction with the catalyst surface.
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高影响因子
危险品化学品经营许可证（带存储）