CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 10
·12663-12672
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IF 5.6
Jiali Li,Hanlu Xing,Shijie Xue,Tao Ma,Jun Sun,Kun Hu,Lin Chen,Xiaoxiao Li,Yi Gong,Xian Zhang,Xingyou Tian
The application field of low temperature co-fired ceramics (LTCC) has been further expanded with the development of electronic packaging technology. Nevertheless, during the preparation process, solvents often volatilize leading to toxicity to humans and environmental pollution. Furthermore, in certain applications, LTCC materials must possess higher strength and thermal conductivity . Herein, we developed a kind of Bi 2 O 3 -B 2 O 3 -SiO 2 -CuO-Al 2 O 3 (BBSCA)/Al 2 O 3 /Al 2 O 3 fibers LTCC composites, synthesized by aqua-based molding and hot-press solid-state reaction method. The addition of Al 2 O 3 fibers can construct the two-dimensional structure and enhance thermal conductivity of the composites. When the Al 2 O 3 fibers content reaches 2 wt%, the resulting composite exhibits a significant bending strength of 308 MPa and an elevated thermal conductivity of 9.31 W/(m·K). Additionally, the composites exhibit excellent dielectric properties , with a dielectric constant of 10.17 and tanδ = 1.24 × 10 −3 at 13 GHz. This work provides a novel approach to construct high-strength and high thermal conductivity LTCC based on environmentally friendly preparation processes.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Kai Sun,Shuai Feng,Qian Jiang,Xiaofeng Li,Yaping Li,Runhua Fan,Yan An,Jiaqi Wang
The soft magnetic composites (SMCs) with high saturation magnetic flux density ( B s ) and low core loss ( P s ) have great potential in power electronics. In this work, the insulating SiO 2 -Al 2 O 3 layer was prepared by a hydro-thermal method to coat on the surface of the carbonyl iron powders (CIPs). Then, the coated CIPs were heterogeneously distributed in the reduced iron powders (RIPs) to fabricate the intergranular insulated SMCs. The scanning electron microscope (SEM) images and elements analysis confirmed that the surface of the CIPs was covered by a thin insulating layer forming a core-shell structure, and the Si-O-Al bond was detected by FTIR spectra. The resulting samples were annealed at 450 °C in N 2 atmosphere to eliminate the residual stress and improve magnetic properties. The annealed. SMCs containing 25 wt% CIPs@SiO 2 -Al 2 O 3 have optimum magnetic properties with a low P s of 106.9 W/kg and a highly approximate B s of 1.28 T (measured at 500 Hz). Compared with the conventional SMCs, the addition of the coated CIPs can suppress the adverse effect of the nonmagnetic coating layer on magnetic properties; meanwhile, the coated CIPs distributed in the RIPs can reduce the P s . This work provides a promising approach to the development of SMCs with low hysteresis loss and optimum magnetic properties at low frequency.
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FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Yi Lin,Zaixing Wang,Lina Tang,Shi Jiang,Yu Guo,Xiaoqin Liu
Ni-based catalysts supported on composite metal oxides (NiO-Al 2 O 3 , MgO-Al 2 O 3 , Co 3 O 4 -Al 2 O 3 ) were synthesized via coprecipitation followed by Ni impregnation to investigate the influence of support composition on catalyst stability in methane steam reforming. Accelerated deactivation protocols (methane decomposition, high-temperature sintering, hydrothermal oxidation) revealed hydrothermal oxidation as the primary cause of irreversible deactivation. The 10Ni/NiAl catalyst (10 wt% Ni/10 wt% NiO-Al 2 O 3 ) showed remarkable regenerability after 923 K hydrothermal treatment, fully restoring its activity. This was attributed to coexisting reduced Ni species and readily reducible NiO, facilitating rapid reactivation. Other catalysts formed thermally stable NiAl 2 O 4 , leading to permanent deactivation. Methane cracking at 973 K had negligible effect, and 10Ni/NiAl catalyst exhibited the lowest carbon deposition (17.02 %). Under extreme hydrogen purged at 1223 K, only the 10Ni/CoAl catalyst exhibited a minor activity decline. The superior stability of 10Ni/NiAl was attributed to an in situ-formed NiAl composite metal oxides during 973 K calcination, which effectively anchored Ni particles, suppressed sintering, and prevented extensive oxidation.
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NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Jiming Wang,Min Ji,Min Wang
The integration of photocatalysis and thermal catalysis offers a sustainable route to drive the dry reforming of methane (DRM) at low temperatures, addressing the high energy consumption of traditional thermocatalytic processes. Herein, we systematically explore the effects of doping rare earth elements (Ce, Pr, and Y) on the photothermal catalytic activity and stability of Ni-based catalysts (Ni–MOx–Al2O3) for DRM. Results demonstrate that Ce doping significantly enhances charge carrier separation efficiency and reduces interfacial impedance, endowing Ni–Ce–Al with superior photocatalytic activity compared to Ni–Pr–Al and Ni–Y–Al catalysts. After 100 h of continuous reaction at 650 °C, the conversions of CH4 and CO2 only decrease from 59.0% and 62.0% to 52.6% and 56.8%, respectively. Mechanistic studies reveal that Ce incorporation increases the density of surface oxygen vacancies, which promotes the activation of CH4 and CO2 and enhances coke resistance under light conditions. Kinetic analysis confirms that Ni–Ce–Al possesses the lowest activation energies for CH4 (40.6 kJ mol−1) and CO2 (36.7 kJ mol−1) dissociation under illumination. This work provides helpful guidance for the design of high-performance Ni-based photothermal catalysts for DRM through rare earth modification, highlighting the crucial role of Ce in optimizing electronic properties and anti-coking ability.
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CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Xiaozhe Wang,Pengchao Zang,Ruijia Liu,Zhiwei Shi,Lin Cui,Jingying Wang,Chunhian Lee,Jiyun Tang,Yong Dong
LA–MA–HD SSPCM delivered 165.7 J/g latent heat with a 32.59 °C melting peak. • 8 wt% EG achieved shape stabilization while retaining 90 wt% PCM loading. • Synergistic EG/nano-Al 2 O 3 network increases thermal conductivity to 1.636 W/(m·K). • The SSPCM retained 99.67% of its enthalpy after 200 cycles. • Cementitious mortar with 20% SSPCM reduced the 100-min temperature rise by 16.4%. Conventional organic phase change materials (PCMs) for building thermal management are limited by low thermal conductivity, leakage, and limited tunability of phase-change temperature. This study develops an application-targeted shape-stabilized PCM (SSPCM) for the 25–35 °C range by integrating ternary eutectic regulation, shape stabilization, and multiscale heat-transfer enhancement. Lauric acid–myristic acid–hexadecanol (LA–MA–HD) ternary eutectic was designed using the Schroeder–van Laar equation and experimental screening, yielding an optimal mass ratio of 48:24:28. The eutectic was vacuum-impregnated into expanded graphite (EG). An EG content of 8 wt% was identified as the minimum level required for shape stabilization while maintaining high PCM loading. With 2 wt% nano-Al 2 O 3 , SEM/EDS observations supported a relatively continuous multiscale conductive network comprising an EG-dominated long-range skeleton and dispersed Al 2 O 3 -assisted local conductive bridges. The SSPCM achieved 90 wt% PCM loading, a melting peak of 32.59 °C, a melting enthalpy of 165.7 J/g, and a thermal conductivity of 1.636 W/(m·K), representing a 478.1% enhancement relative to the eutectic PCM. FT-IR and XRD confirmed component compatibility and structural preservation. After 480 h intermittent thermal exposure and 200 accelerated thermal cycles, mass loss remained below 0.85%, with 99.67% enthalpy retention after cycling. Cementitious validation showed that replacing 20% of the standard sand with SSPCM reduced the 100-min mean surface-temperature rise by 16.4% and delayed the time required to reach SSPCM melting-temperature by 35.1 min. These results demonstrate a coordinated balance among phase-transition regulation, latent-heat storage, heat-transfer enhancement, shape stability, and long-term reliability for low-temperature building thermal management.
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Coatings
·
2026
·Vol. 16
·期 3
·327
·
IF 3.4
Ronghui Mao,Shuang Huang,Yilan Dou,Xinyi Mo,Tianquan Liang
HighlightsWhat are the main findings?•The dense double reaction layer of anorthite–spinel exhibits a positive effect on inhibiting the infiltration of calcium–magnesium–aluminum-silicate.•The thickness of the reaction layer increases with reaction time, while the growth rate rapidly decreases.•More Gd2O3doping enhances the outward diffusion of Gd3+and promotes the crystallization of the CMAS and apatite phases.•The inward infiltration of CMAS and outward diffusion of Al3+and Gd3+along the grain boundaries of the anorthite and/or spinel phases thicken the reaction layers.What are the implications of the main findings?•They clarify the reaction mechanism between Al2O3-based ceramics and CMAS in a high-temperature environment.•Doping with rare-earth Gd2O3can serve as an effective strategy for enhancing the CMAS corrosion resistance of Al2O3-based ceramics.•This study provides valuable reference guidance for the compositional design and research development of CMAS corrosion-resistant materials.The exploration of new materials with stable molten calcium–magnesium–aluminum-silicate (CMAS) resistance at elevated temperatures is of great significance to the development of advanced aero-engines. In the present study, Al2O3−xGd2O3(x = 5, 10, 20, 30 mol.%) ceramic samples were prepared by the high-temperature solid-state synthesis method. The thermochemical reaction behavior, reaction products, and growth kinetics of the reaction layer for the ceramics with molten CMAS at 1300 °C were investigated. The results reveal that the primary reaction products between Al2O3−xGd2O3ceramics and molten CMAS are anorthite (CaAl2Si2O8), gehlenite (Ca2Al(AlSi)O7), spinel (MgAl2O4), and Gd-apatite (Ca2Gd8(SiO4)6O2). In the initial reaction stage, a dense double-layer reaction layer composed of anorthite and spinel is formed at the ceramic/CMAS interface, while its growth rate decreases with increasing reaction time. Increasing the Gd2O3doping content inhibits the growth of the reaction layer and enhances the CMAS penetration resistance of Al2O3−xGd2O3ceramics. The mechanism is discussed systematically.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Ding Liu,Zhenkun Su,Bo Han,Kaisheng Xia,Chenggang Zhou,Qiang Gao
Cobalt–aluminum oxide clusters-embedded γ-Al 2 O 3 nanosheets (CAO@AO) were facilely fabricated and developed for peroxymonosulfate (PMS) activation. Interestingly, the Al–OH-rich amphiphilic surface of CAO@AO endowed the catalyst with unique interfacial pH-buffering property, which stabilized the reaction media at nearly neural level and thus prevented the cobalt sites from leaching. Moreover, the presence of Al–OH groups around the Co−Al oxide clusters facilitated the activation of PMS and the redox cycle of Co 2+ /Co 3+ , which resulted in a boosted catalytic activity. Consequently, the CAO@AO exhibited zero leaching of cobalt and high efficacy for PMS activation, enabling complete and ultrafast removal of metronidazole with a significantly higher turnover frequency (TOF, 1.83 min −1 ) than that of Co 3 O 4 (0.004 min −1 ). It was also demonstrated that introducing suitable foreign metal into CAO@AO could further enhance the catalytic activity (e.g., TOF of Mn(40%)-CAO@AO: 5.80 min −1 ). Furthermore, Mn(40%)-CAO@AO-decorated granular support was synthesized that dominated a continuous-flow degradation in column reaction system.
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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 .
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haiping Zhou,Gang Wang,Liping Wang,Zhenhua Zhang,Huiliang Hou,Qifan Zhong,Jin Xiao
Industrial alumina was used as raw material in the high-temperature calcination process, and AlF 3 was introduced to promote mass transfer in the gas phase. The calcination environment, such as sealing, calcination temperature, and holding time, was analyzed to enhance the effect of AlF 3 to promote the crystal growth of alumina. Here, round-like flake α-Al 2 O 3 with an average particle size (D50) of about 18–38 μm were obtained at low dosages (0.1–0.4 wt%) of AlF 3 . The morphology and particle size of α-Al 2 O 3 were further adjusted by introducing different types of micron-scaled nuclei as template inducers. Round-like flake and spherical-like large single crystals α-Al 2 O 3 with an average particle size greater than 35 μm were obtained, respectively, with 65 wt% of 15 μm flake and 10 μm bulk α-Al 2 O 3 nuclei added. In addition, the regulation mechanism of AlF 3 and nuclei on alumina crystal growth was also discussed. Finally, a theoretical basis and technical support for preparing high-performance, low-cost, and high thermal conductivity alumina fillers was provided.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Kai Shi,Xia An,Yali Du,Zhaoyang Fan,Xu Wu,Xianmei Xie
A series of nickel catalysts supported on Al 2 O 3 that modified with Ce-, Zr-, and Mg-promoter were prepared via a sol-gel method and a subsequent impregnation method for the ethanol steam reforming reaction (ESR). The effect of promoters on the carbon deposition was focused. Compared with Ni/Al 2 O 3 catalyst, the introduction of different promoters decreased the selectivity for CH 2 CH 2 to different extent, especially, Ce-, Mg- containing catalysts completely suppressed the production of CH 2 CH 2 for 30 h tested at 500 °C. And the medium and strong acid sites were confirmed as the major sites for CH 2 CH 2 production. Encapsulation carbon derived from ethylene takes the primary responsibility for carbon deposition, and the formation of metal carbide is the other reason for causing carbon deposition. Among the tested catalysts, Ni/Mg–Al 2 O 3 exhibited a better performance for anti-carbon, which was attributed to the blockage of medium and strong acid sites as well as the high Ni crystallinity .
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FUEL
·
2022
·
IF 8.035
Miao Zuo,Xinyu Wang,Wenlong Jia,Yanzhong Zhu,Xianhai Zeng,Lu Lin
As one of the essential building blocks for bio-chemicals and bio-fuels, the 5-Hydroxymethylfurfural (HMF) production is still challenging in a green and cheap way. This work developed a bio-derived aqueous-natural deep eutectic solvent (A-NADES) to synthesize HMF using α-Al 2 O 3 or Al(OH) 3 as robust catalysts, obtaining high yields of 67.1% and 63.6% HMF from glucose under mild reaction reactions, respectively. Different kinds of starches and starchy food waste also exhibited high conversion efficiency in the A-NADES system. The mechanistic study indicated that the in-situ formed Al (III) site of α-Al 2 O 3 during the reaction was critical for converting glucose-based carbohydrates. A-NADES could be effectively reused six times with a more convenient direct reuse method without significant activity loss. This study suggested a novel A-NADES reaction media in the synergistic reaction with robust aluminum-based catalysts for HMF synthesis, and proposed a novel process of food waste utilization in green solvents.
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FUEL
·
2022
·
IF 8.035
Zengtong Deng,Syed Shatir A. Syed-Hassan,Yuanjing Chen,Long Jiang,Jun Xu,Song Hu,Sheng Su,Yi Wang,Jun Xiang
Bio-oil can be converted to chemicals, carbon material, or syngas by various thermochemical processes which are always preceded with the pyrolysis step. In bio-oil pyrolysis, coke formation is almost inevitable, causing difficulties for further processing. In this study, bio-oil was mixed with Ni/Al 2 O 3 before it was fed for pyrolysis. Interesting results were observed whereby the effect of Ni/Al 2 O 3 mixing on coke formation shifted from promoting to inhibiting with increasing pyrolysis temperature. When the temperature was higher than 700 °C, contrary to the cases without mixing, the apparent decreases in coke yield were observed (e.g., the coke yield decreased by 10% at 800 °C). Comparative studies on bio-oil and its lignin-derived oligomer fraction indicated that the catalytic cracking of small molecules could enhance the formation of hydrogen radicals, which promoted thermal decomposition of lignin-derived oligomers, thus inhibiting coke formation via polymerization.
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