CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jinchen Ma,Daofeng Mei,Weiwei Peng,Xin Tian,Danyan Ren,Haibo Zhao
Calcium looping (CaL) is extensively used in post-combustion capture of CO 2 and sorption-enhanced steam methane reforming because of its advantages of low cost and theoretically high CO 2 -capture capacity. Despite this, unstable reactivity of sorbent (CaO) and significant heat requirement for CaCO 3 calcination were always encountered in CaL. To address the aforementioned issues, a core-shell structured CaO-CuO/MgO@Al 2 O 3 sorbent (CCMA for short) was synthesized via the self-assembly template synthesis (SATS) method, and systematically investigated in terms of carbonation, calcination-reduction and oxidation cycles. In comparison to wet-mixing CaO-CuO material (CC), MgO-supported CaO-CuO (CCM) and Al 2 O 3 -supported CaO-CuO (CCA), the CCMA performed the highest CO 2 uptake capacity, which was quite stable at around 0.08 [g CO 2 ∙(g material) −1 ] in the 30 cyclic tests. In calcination-reduction stage, CaO in CCMA can be fully recovered by the decomposition of CaCO 3 , meanwhile the corresponding heat requirement can be compensated by the exothermic reaction between CuO and CH 4 , i.e., thermal neutrality can be achieved by using CCMA. The Cu in reduced CCMA can be subsequently oxidized back to CuO in the oxidation stage with a conversion of 97–98%, which is much higher than CC, CCM and CCA. After cycles, no serious sintering was observed for the CCMA and the measured crushing strength (1.4 N) was sufficient for fluidization, which, in combination with its high reactivity, makes this material very promising for CaL-CLC process.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Songtong Xuan,Yuming Tian,Xiangchen Kong,Jianying Hao,Xiaojun Wang
The tuning of the properties of MgAl 2 O 4 -based materials has aroused great attention in the field of engineering technology. Along these lines, magnesia and alumina were used as raw materials to prepare spinel by the solid-phase sintering method at 1500–1600 °C. Particularly, the impacts of the different MgO/Al 2 O 3 molar ratios on the microstructural densification, sintering process and mechanical property of the fabricated materials were systematically studied. The results showed that the stoichiometric spinel with the highest concentration of ion diffusion possessed the best densification. And the magnesium-rich spinel displayed the better densification following with the formation of solid-solution, while the aluminum-rich spinel exhibited the worst ability in forming the solid-solution. Moreover, the different molar ratios changed the microstructure of the spinel, which induced the optimal sintering temperature of stoichiometric spinel to be at least 50 °C below that of the others. Specifically, in stoichiometric spinel, spinel grains grew up and formed obvious structure, which made the sintering process arrive at the end point and made the performance reach the best. Specifically, the flexural strength was 112.62 MPa and apparent porosity was 0.44%. However, no grown or developed spinel grains were observed for magnesium-rich/aluminum-rich spinels, which delayed the sintering process.
研究领域:
材料科学
·
无机非金属材料
·
陶瓷工艺学
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固态化学
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结构陶瓷
✓ 已验证
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 8
·1800829
·
IF 3.175
Bin Xiao,Peng-bo Wang,Zhen-jiang He,Zhuo Yang,Lin-bo Tang,Chang-sheng An,Jun-chao Zheng
0.5Li 2 MnO 3 ·0.5LiNi 0.5 Mn 0.3 Co 0.2 O 2 cathode materials with nano-MgO and nano-TiO 2 coating layers are synthesized via a facile approach. These nanocoating layers with a thickness of ≈20 nm are homogeneously coated on the surface of the materials. With the nano-MgO and nano-TiO 2 coating layers, the modified materials deliver excellent electrochemical performance. Nano-MgO-coated and nano-TiO 2 -coated Li-rich materials exhibit 147.56 and 137.96 mAh g −1 after 100 cycles at 1C rate and deliver 156.13 and 130.69 mAh g −1 at 2C rate, respectively, in the voltage range of 2.0–4.8 V. The materials with nano-MgO and nano-TiO 2 coating layers also show a high discharge voltage retention of more than 90% after 50 cycles, low impedance for Li + migration, and high diffusion coefficients of the lithium ions. Nano-MgO and nano-TiO 2 coating layers help decrease the content of Li 2 CO 3 on the surface of the materials and suppress side reactions. Thus, these materials play a significant role in strengthening the electrochemical performance of Li-rich cathode materials.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 12
·期 3
·762-772
·
IF 6.119
Yitao Liu,Xianglin Liu,Zixu Yang,Hu Li,Xiaoxu Ding,Minjie Xu,Xinli Li,Wei-Feng Tu,Minghui Zhu,Yi-Fan Han
We reported a χ-Fe5C2/MgO catalyst for olefin synthesis directly from syngas (STO), showing high selectivity to C2–C4 olefins and catalytic stability. With characterization of the morphology, electronic structures, and adsorption/desorption properties using in/ex situ techniques (XPS, TEM, XRD, MES, PHTA and TPD), we revealed that MgO could act not only as a structural promoter to disperse the active iron phase and prevent particle agglomeration during the reaction, but also as an electronic modifier to transfer electrons to iron. In particular, by combination of spectroscopy and theory calculations, we have proved that the close intimacy between χ-Fe5C2 and MgO (∼0.3 electrons transfer from MgO to χ-Fe5C2) enhanced CO dissociative adsorption whilst weakening the secondary hydrogenation of olefins, leading to the enhancement of selectivity. The dual roles of MgO in χ-Fe5C2/MgO may shed light upon rational design of practical STO catalysts by taking advantage of the exceptional strong metal–support interactions (SMSIs).
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rencong Geng,Tingye Fan,Ping Yang,Wenlei Jia,Ju Zhou,Mingwei Li,Wenhan Qi,Shiqi Li,Jiao Han,Yiming Zeng
Si 3 N 4 ceramics are highly valued for their exceptional thermal conductivity and mechanical properties. This study investigated the effects of different addition ratios of Y 2 O 3 -MgO-MgSiN 2 ternary sintering additives on liquid phase viscosity, densification, microstructure, thermal conductivity and mechanical properties. The incorporation of MgSiN 2 as sintering additives introduced additional Si and N into the liquid phase, forming a nitrogen-rich liquid phase that promoted the grain growth showing a bimodal distribution. When the MgO/MgSiN 2 ratio reached 2/3, the moderate liquid phase viscosity facilitated enhanced densification and grain growth. This resulted in an increased number of large grains, a moderate grain size distribution, and a good bimodal microstructure. Consequently, the 2M3N exhibited superior properties, including a thermal conductivity of 105.22 W m −1 K −1 , a fracture toughness of 5.91 MPa m 1 / 2 , and a bending strength of 726.12 MPa. The study demonstrates that precise control of the Y 2 O 3 -MgO-MgSiN 2 ratio can effectively regulate the microstructure, leading to improved thermal and mechanical performance.
研究领域:
材料科学
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陶瓷
·
热性能
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 8
·2524-2532
·
IF 3.186
Jiang Haoxi,Jiang Angjiong,Gao Qiang,Yang Guochao,wang Lingtao
In this work, Ta was firstly reported as an efficient promoter of MgO–SiO 2 for the conversion of ethanol and acetaldehyde to 1,3-butadiene. The doping of Ta into MgO–SiO 2 forms Ta–O–Si bonds and generates more strong Lewis acid sites, which not only promote the aldol condensation reaction but also significantly facilitate the Meerwein–Ponndorf–Verley reduction, the total conversion around 80% which drops to 65% after 24 h. In addition, the catalyst showed desirable stability in 24 h long-term stability evaluation, the selectivity remained stable at 80%. Graphic Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiaoning Liu,Junyan Fu,Yiwei Tang,Richard L. Smith Jr,Xinhua Qi
MgO-doped ordered mesoporous carbon (OMC-MgO) was synthesized by evaporation-induced self-assembly (EISA) in one-pot with biomass-derived gallic acid instead of phenolics as carbon precursor, metal ion Mg 2+ instead of formaldehyde as cross-linking agent and F127 as template. Mg had dual roles as cross-linking agent to coordinate gallic acid-F127 micelle composites, and as promoter of active sites. With the developed protocol, MgO could be uniformly dispersed throughout the carbon skeleton during calcination at 800 °C without agglomeration. As-prepared OMC-MgO-T800 had a specific surface area of 808 m 2 /g, a perfectly-ordered mesoporous structure centered at (6–8) nm, and exhibited good performance for phosphorus removal from aqueous solutions with a maximum sorption capacity of 107 mg/g. Electrostatic attraction, ligand exchange, and Lewis acid-base interactions are the main phosphate adsorption mechanisms of the developed MgO-doped OMC adsorbents. The as-prepared mesoporous carbon materials are highly selective for phosphorus adsorption from aqueous streams and are reusable and recyclable. This work proposes a green protocol to synthesize OMC-metal oxide composites that is widely applicable to wastewater treatment and technological areas in catalysis and energy storage.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 1
·132-143
·
IF 3.9
Milad Kermani,Jinghua Wu,Zexiao Liu,Fei Zuo,Hua-Tay Lin,Chunfeng Hu,Salvatore Grasso
This work examines the impact of sintering thermal history on kinetics of grain growth for 1264 ppm (0.1 wt%) MgO-doped alumina. Results suggest that sintering with a high heating rate in the order of ∼10 3 °C min −1 retards grain growth rate. By contrast, a slow heating rate of 5°C min −1 resulted in an increase in grain growth constant by a factor of ∼4. The segregation of Mg to grain boundaries, favored by short sintering duration, is considered to be one of the possible factors contributing to the retarded grain growth rate for the rapidly heated compacts. Furthermore, it is proposed that the simultaneous combination of retarded grain boundary migration rate and limited surface-diffusion-driven grain coarsening, promoted by rapid heating, enables pressure-less fabrication of translucent alumina without a need for vacuum or hydrogen atmosphere. In fact, it is demonstrated that weakly translucent alumina can be produced at relatively low temperatures of 1475–1550°C by sintering with a high heating rate (herein, ∼10 3 °C min −1 ) in ambient atmosphere.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Feng Shi,Hongyuan Wang,Yifei Chen,Yanling Lu,Defa Hou,Can Liu,Yi Lu,Xu Lin,Xiaoqin Yang,Zhifeng Zheng,Yunwu Zheng
To develop an efficient and feasible catalyst for converting inedible vegetable oil to green biodiesel via a one-step decarboxylation process, a series of Ni-based MgO-Al 2 O 3 catalysts with different active Ni species were fabricated by adjusting the various Ni loading amounts (2.5–20%) and applied to the catalytic deoxygenation of OA to generate green biodiesel. Additionally, the structure-property relationship, deactivation mechanism and regeneration performance were also evaluated via various characterization technologies (XRD, BET, NH 3 -TPD, H 2 -TPR, XPS, SEM-EDX, HRTEM, TGA, Raman as well as GC/MS and UV-fluorescence spectra). The experimental results indicated that Ni introduction obviously enhanced the conversion ratio. Ni (10%)/MgO-Al 2 O 3 catalysts exhibited excellent catalytic performance with the highest HCs (95.12%), olefin content (57.37%) and green biodiesel content (75.90%) due to mild Brønsted-rich acidity sites, lower reduction temperature, higher active metallic Ni species content, suitable oxygen vacancy content and favorable texture properties via the decarbonylation reaction pathway. Furthermore, lower Ni loading was beneficial to gasoline and bioaviation fuel generation due to higher Brønsted-rich acidity sites and total acid amount, which boosted C-C scission by cracking reaction, and higher Ni content facilitated biodiesel formation. Additionally, Ni (10%)/MgO-Al 2 O 3 catalysts showed excellent reusability and regeneration due to Ni active species, but these advantages were slightly decreased (HCs: from 95.12% to 61.63%; biodiesel: from 75.90% to 57.52%) due to coke deposition and metal active species leaching and oxidation .
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yaoqi Huang,Yanxu Wang,Lingwen Song,Yi Yuan,Shaojun Yuan
Hydrogen sulfide (H 2 S) is a hazardous and malodorous pollutant with severe environmental and health impacts. A promising approach for H 2 S removal involves coupling adsorption with low-temperature catalytic oxidation using alkaline metal oxide-loaded carbon-based materials. However, the effectiveness of these materials is often limited by pore blockage caused by metal oxides and desulfurization byproducts. N-doped carbon aerogels offer a solution to this issue due to their large specific surface area and well-developed pore structure. In this study, a novel MgO-MnO-loaded N-doped carbon aerogel (MgO-MnO/NC) was synthesized by one-step high-temperature pyrolysis of cellulose-based aerogel precursor for highly efficient low-temperature H 2 S desulfurization. The effects of pyrolysis temperature and metal oxide loading on H 2 S removal efficiency was systematically investigated. The optimized MgO-MnO/NC-600–0.3 (where 600 represents the pyrolysis temperature and 0.3 denotes the mass ratio of metal salts to cellulose) exhibited outstanding H 2 S removal performance, achieving an ultrahigh desulfurization capacity of 1696 mg/g. The desulfurization conditions, such as O 2 content and relative humidity, were found to play a crucial role in the H 2 S removal process. In situ DRIFTS and XPS analyses revealed a synergistic mechanism of reactive adsorption and catalytic oxidation on the MgO-MnO/NC surface. The desulfurization products were identified as sulfur, sulfate and metal sulfide (MgS and MnS). This study not only proposes a feasible strategy for fabricating biomass-derived aerogel carbon, but also offers valuable insights into the catalytic oxidation of H 2 S for enhancing the desulfurization performance of N-doped carbons.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Yu Hu Zhou,Zi Hao Zou,Jian Xiang Teng,Zhan Yu Wu,Si Wei Luo,Xu Ning,Chuan Ye,Long Yang,Wei Seong Toh
Avascular necrosis of the femoral head (ANFH) is a debilitating musculoskeletal disorder that is typically caused by impaired blood supply to the hip joint. In treating irregular bone defects that resulted from ANFH, injectable hydrogels are particularly attractive as they can be administered in a minimally invasive manner and conform to the variable shape of a bone defect. However, they often lack the biochemical and mechanical properties for effective bone repair. To address these issues, an injectable composite hydrogel, SA/β-TCP@PMP, composed of sodium alginate (SA) and β-tricalcium phosphate (β-TCP) crosslinked with glucono-delta-lactone (GDL), and enforced with varying concentrations of poly(3-hydroxybutyrate- co -4-hydroxybutyrate)/magnesium oxide and polyethylene glycol (P34HB/MgO+PEG; PMP) coaxial electrospun microfibers are formulated. By varying the concentrations (0%, 1%, 2%, 4%) of PMP microfibers, the physical properties of the composite hydrogel, including its injectability, surface morphology, swelling, degradation, and mechanical properties, as well as magnesium ions (Mg 2+ ) release can be finely tuned. Among all, SA/β-TCP@2%PMP composite hydrogel demonstrates superior angiogenic and osteogenic properties, and promotes robust new bone formation in a rabbit model of steroid-induced ANFH. Overall, this novel composite hydrogel offers significant application potential for minimally invasive treatment of irregular bone lesions in ANFH.
研究领域:
生物医学工程
·
骨科
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2012
·Vol. 39
·期 4
·3915-3919
·
IF 1.751
Junxia Wang,Hengchang Nie,Chunfeng Lan,Genshui Wang,Xianlin Dong,Xuefeng Chen,Fei Cao,Hongliang He
Porous Pb (Zr 0.95 Ti 0.05 ) O 3 / x MgO (PZT/MgO, x =0, 0.1, 0.2, 0.5 and 1.0 wt%) ferroelectric ceramics were prepared with MgO nanoparticles as reinforcing phase. The effects of MgO nanoparticles on the phase, microstructure, electrical and mechanical properties of as-prepared ceramics were investigated. The results show that the grain size is reduced obviously when increasing the amount of MgO. Compared with pure porous PZT, T C of MgO-added PZT ceramics shifts to higher temperature. Moreover, dielectric, ferroelectric and piezoelectric properties show no much degradation. Further, PZT/MgO ceramics possess enhanced mechanical properties compared to pure porous PZT ceramics, the largest increment of the fracture toughness and hardness being 31.3% and 19.8%, respectively. The optimal electrical and mechanical properties are obtained with the addition of less than 0.5 wt% MgO nanoparticles.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
电子材料
·
固态物理
·
纳米复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）