JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 25
·期 3
·719-726
·
IF 1.624
Hu Xuebing,Yu Yun,Ren Shuang,Lin Na,Wang Yongqing,Zhou Jianer
To achieve superior separation performance in the phenol aqueous solutions treatment, a novel graphene oxide/Al 2 O 3 composite membrane was prepared by a spin coating process. The microstructure measurement shows that the composite membrane has a multilayer structure and graphene oxide has been tightly coated on the surface of the Al 2 O 3 membrane interlayer homogeneously. During the treatment of phenol aqueous solutions, the permeation flux and phenol rejection of the composite membrane were investigated. The results show the permeation flux of the membrane is about 1.153 L m −2 h −1 bar −1 and the phenol rejection of the membrane increases to 99.9% when the phenol concentration is 0.01 g L −1 . The high phenol rejection of the composite membrane is mainly attributed to the physical sieving, the solution–diffusion effect and the hydrophobic nature of graphene oxide. All these results indicate the GO/Al 2 O 3 composite membrane is a suitable material for the removal of phenol from aqueous solutions in environmental pollution management.
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
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Xiaowei Zhou,Chao Gao,Hao Luo,Zhiwei Liu,Haixu Liu,Haifeng Gao,Qing Zhou,Wenbo Li,Xiaoyun Teng,Wei Yu
In this paper, we reported a modified preparation process for Cu 2 ZnSn(S,Se) 4 (CZTSSe) films. For this process, Al 2 O 3 capping layers were deposited on precursor films before selenization. It was found the capping layer can prevent the formation of separate Cu x Se phase on top of the film and facilitate a homogeneous growth of the crystalline grains during selenization. Detailed characterizations revealed the reason: the Al 2 O 3 capping layers can inhibit the incorporation of Se into the film in low-temperature region (below 350 °C). So the reaction between Se and Cu, which is thermodynamically preferential in this temperature region, can be prevented. As the disappearance of Cu x Se, the traditional top-to-down crystallization mode was substituted by a homogeneous crystallization mode. Therefore, CZTSSe films with homogeneous crystallization properties were achieved. By using the capping layers, the efficiencies of the solar cells were improved. In particular, the open-circuit voltage (V OC ) of the solar cell increased by ~18% by using the capping layers.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1753-1761
·
IF 2.6
Zhao Wenpu,Ji Yuecheng,Pang Yifan,Li Xiaolei,Ji Huiming
Al 2 O 3 -SiO 2 aerogel (ASA) was prepared by convenient ambient pressure drying using inexpensive AlCl 3 ·H 2 O as precursor, and silicon was deposited during the aging of aluminum gel. To explore the influence of Chloride ion on the property of ASA, ion exchange technology was used to remove the Chloride ion in the aluminum sol. ASA exhibits a low thermal conductivity of 0.029 W m −1 K −1 at room temperature, and the specific surface area of Cl-free ASA after heat-treated at 1200 °C is 95.2 m 2 /g, which is higher than that of the chlorine-containing aerogel (11.4 m 2 /g), showing enhanced thermal stability of ASA. Analysis of XRD and XPS indicate that the removal of chloride ions makes it more difficult for ASA to establish Al–O–Si groups during the aging process, so the γ-Al 2 O 3 and cristobalite phase do not transform to mullite phase at 1200 °C. Due to the better thermal stability of ASA, it has great potential for high-temperature applications in the fields of insulation, thermal protection materials, and building external wall thermal insulation.
研究领域:
材料科学
·
纳米技术
·
热工工程
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2016
·Vol. 109
·期 9
·
IF 3.142
Yao Manwen,Peng Yong,Xiao Ruihua,Li Qiuxia,Yao Xi
SrTiO 3 /nano Al 2 O 3 inorganic nanocomposites were prepared by using a conventional sol-gel spin coating process. For comparison, SrTiO 3 films doped by equivalent amount of sol-Al 2 O 3 have also been investigated. Aluminum deposited by using vacuum evaporation was used as the top electrode. The nanocomposites exhibited a significantly enhanced dielectric strength of 506.9 MV/m, which was increased by 97.4% as compared with the SrTiO 3 films doped with sol-Al 2 O 3 . The leakage current maintained of the same order of microampere until the ultimate breakdown of the nanocomposites. The excellent electrical performances are ascribed to the anodic oxidation reaction in origin, which can repair the internal and/or surface defects of the films.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES
·
2016
·Vol. 19
·期 2
·358-365
·
IF 0.738
Yanfang Liu,Guixia Li,Zhili Zhang,Xiang Gao,Jianrui Niu,Junna Zhao,Zaixing Li
γ-Al 2 O 3 supported Manganese and Ferric oxide (Mn-Fe/Al 2 O 3 ) were synthesized and used as catalyst for ozonation of bisphenol A (BPA) in aqueous solution. It was conducted in a semi-batch reactor under different operational conditions, i.e., varying initial pH, ozone flow rate, initial BPA concentration and catalyst dosage. The results indicated that the presence of Mn-Fe/Al 2 O 3 lead to a great enhancement in ozonation of BPA. Using 5 g/L Mn-Fe/Al 2 O 3 evaluated BPA (50 mg/L) removal efficiency up to 84.1% under particular reaction conditions, while that of the single ozonation process was 48.5%. The influence of tert-butanol demonstrated that initiation of hydroxyl radicals was involved and plays an important role in catalytic ozonation. The decrement of solution pH in catalytic ozonation was much higher than that in ozone alone, indicating much small molecule acids produced in catalytic ozonation process. The repeated use the Mn-Fe/Al 2 O 3 proved that it had a good reusability and stability.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ruitong Chi,Zhuowei Zhou,Zhixiao Zhang,Haiping Zhao,Yu Dong,Yafeng Wang,Yusen He,Yanming Wang,Xiaorong Zhang
In this study, a novel closed spherical-shell-shaped toughening phase morphology is purposely constructed within Al 2 O 3 ceramics. The continuous Al 2 O 3 matrix is segregated by the TiC x O y N z spherical shells, with both the interior and exterior of each shell maintaining the Al 2 O 3 phase. Such spherical shells with the thickness of approximately 150 nm are comprised of submicron-sized TiC x O y N z grains in stack. Accordingly, such hierarchical microstructure gives rise to a multidimensional crack propagation mode in which cracks repeatedly expand along the external and internal interfaces of TiC x O y N z spherical shell and Al 2 O 3 ceramic matrix on a microscaled level, as well as across TiC x O y N z grain interfaces within the shell layer on a submicron scale. This synergistic action significantly increases crack propagation resistance through continuous energy dissipation at multiple length scales. Consequently, the Al 2 O 3 -TiC x O y N z composite ceramic achieves a remarkable fracture toughness of 6.47 ± 0.21 MPa m 1/2 . This work provides a novel strategy for designing high-performance Al 2 O 3 ceramics through engineered toughening phase morphology.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengchuan Li,Tongsheng Zhang,Rensheng Li
The thermodynamic data of rare earth-containing systems are crucial for the development and application of permanent magnets, optoelectronic materials, high-temperature superconducting materials, and catalysts. In this study, the equilibrium phase compositions of the CaO-Ce 2 O 3 -SiO 2 -(5∼25 wt%) Al 2 O 3 system at 1873 K were investigated through high-temperature equilibrium experiments. The equilibrium phase compositions at 1873 K were determined using SEM, XRD, and EPMA, leading to the construction of isothermal sections. For the CaO-Ce 2 O 3 -SiO 2 -5 wt% Al 2 O 3 system, the isothermal cross-section diagram revealed a liquid phase region, four distinct two-phase equilibria, and two different three-phase equilibria. As the Al 2 O 3 content increased to 25 wt%, the isothermal cross-section diagram showed a liquid phase region, five different two-phase equilibria, and three distinct three-phase equilibria. The experimental results provide valuable insights for further research on the practical applications of cerium-containing rare earths in various fields.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Cheng Wang,Fengsheng Zhan,Shan Wang,Yi Wei,Jianbing Ji
Methane pyrolysis is a promising sustainable technology for CO 2 -free hydrogen production. However, the development of stable methods for methane pyrolysis to produce hydrogen at lower temperatures has presented significant challenges. This study presents a reaction system that combines molten carbonate with Ni/Al 2 O 3 catalyst and investigates methane pyrolysis using this system in a bubble-cap reactor. Remarkably, this system exhibited a low activation energy of 145.8 kJ per mole, enabling the achievement of a methane conversion of 92.5 % at 580 °C by employing a double-layer bubble cap tray configuration. Furthermore, the system showcases sustained activity for a duration of up to 72 h.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Jundao Wu,Zeai Huang,Zhen He,Rustem Zairov,Xiaoting He,Yue Huang,Mengyao Fu,Chengdong Yuan,Oleg G. Sinyashin,Ying Zhou
The catalytic methane(CH 4 ) and hydrogen sulfide(H 2 S) reforming (H 2 SMR) represents a promising approach for producing high-value sulfur-carbon compounds and hydrogen without generating the greenhouse gas of CO 2 . Despite its significant potential, the mechanistic understanding of interactions between CH 4 and H 2 S remains contentious, posing substantial challenges for catalyst development. In this study, we employed a Mo/Al 2 O 3 catalyst to elucidate synergistic conversion pathways between CH 4 and H 2 S during H 2 SMR. At 1173 K with a reaction duration of 0.5 h, conversion rates of CH 4 and H 2 S reached 63.7 % and 59.2 %, respectively, accompanied by H 2 and CS 2 production rates of 688.8 μmol g −1 min −1 and 444.3 μmol g −1 min −1 , respectively. Notably, the catalyst exhibited stable performance over 5 h without significant deactivation, in contrast to pure methane cracking reactions where CH 4 conversion rapidly declined from 43.6 % to 14.3 %. Through in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with alternating CH 4 /H 2 S exposure experiments, we successfully tracked the synergistic conversion pathway on the Mo/Al 2 O 3 catalyst. These investigations revealed that the formation of CH 3 S intermediates serves as a critical step facilitating CS 2 generation. This mechanistic insight not only advances fundamental understanding of H 2 SMR reaction pathways but also provides a rational foundation for designing optimized catalysts with enhanced stability and extended operational lifetimes. The identification of this intermediate-driven mechanism addresses previous controversies regarding CH 4 -H 2 S interactions and offers strategic guidance for developing efficient sulfur-resistant catalytic systems.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Tao Xu,Meihui Jiang,Xuhui Mao,Falak Sher,Tianlin Ren,Kun Xin,Irshad Hussain,Helin Hua,Xu Wang
This study investigated the important role of hydroxyl groups for the preparation of γ-Al 2 O 3 sphere supported metal catalysts. γ-Al 2 O 3 spheres were calcinated at varied temperatures for the analysis of surface hydroxyl group, and they were subsequently loaded with iron to evaluate the metal dispersion and the performance for catalytic ozonation. The results showed that the critical site for metal anchoring was hydroxyl group, thus a higher hydroxyl group content favored the metal dispersion on γ-Al 2 O 3 spheres; meanwhile, the iron-loaded catalysts prepared by the γ-Al 2 O 3 support calcinated at 300 °C achieved the highest catalytic efficiency for p -nitrophenol degradation (74.6 %). The favorable performance of the catalyst was attributed to the excellent dispersion of iron oxide particles, and the abundant oxygen vacancy sites that facilitated the formation of ozone-activating sites, Fe-centered hydroxyl groups ([Fe-OH]). This study provides an important theoretical guidance for the design and application of ozone catalysts.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Qiangqiang Wu,Hanke Li,Guangxing Yang,Yonghai Cao,Hongjuan Wang,Feng Peng,Hao Yu
A variety of adsorbed intermediates have been extensively assigned during CO 2 hydrogenation on Pt/γ-Al 2 O 3 . However, the surface sites where the surface species reside have not been well resolved, which are extremely important to depict the reaction pathways of CO 2 hydrogenation. In the current work, surface species adsorbed on three regions were distinguished by in situ diffuse-reflectance infrared Fourier transform spectroscopy, i.e., contiguous Pt region of Pt nanoparticle, interfacial Pt int -O-Al int region between Pt nanoparticle and γ-Al 2 O 3 , and surface region of γ-Al 2 O 3 away from Pt nanoparticle. The dynamics of adsorbed H species, carbonyl species, bicarbonates, formate species, and adsorbed CO 2 , were identified at different sites, proving that the reaction occurs at the Pt/γ-Al 2 O 3 interface. We found that only the C-containing species at the Pt perimeter are directly active intermediates for the reaction. Such spatial analysis bridges the gap between the hydrogen activation and CO 2 activation, providing a deep understanding of CO 2 hydrogenation. In addition, the interface structure with oxygen vacancy is important for CO 2 activation, driving the reaction through carboxylate (*HOCO) pathway to form CO at the interface rather than formate (*HCOO) pathway and then be hydrogenated at the Pt surface.
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
CATALYSIS TODAY
·
2022
·
IF 6.562
Xiaotong Meng,Yuchao Lyu,Junhao Liu,Wenshuo Ma,Yupeng Tian,Jianye Fu,Xinmei Liu
Spent catalysts from the hydrofining process are hazardous wastes, while their appropriate utilization can also bring enormous environmental and economic benefits. Herein, a chemical resurrection method was developed to resurrect and recycle the industrial spent NiMo/Al 2 O 3 hydrofining catalyst. The spent catalysts are calcined to remove the carbon deposit followed by the treatment with citric acid (CA) and ethylene glycol (EG). The results show that the calcination can also accelerate the aggregation and inerting of the active phase. However, the redispersion and reactivation of the inactive phases over the spent catalysts are realized through formation of metal complex with the citric acid, which weaken the interaction between Mo species and support. It increases reducibility of the Mo species and then improve the sulfurization degree of the resurrected catalyst. Besides, the average length of MoS 2 is reduced while the stacking number is increased. The ethylene glycol further regulates the reducibility of Ni and Mo species to promote the formation of NiMoS phase with high activity instead of Ni 3 S 2 . Consequently, the average length of the MoS 2 is reduced while the average stacking number of MoS 2 and content of the NiMoS phase are increased over the resurrected catalyst compared with the spent catalyst. It recovers the hydrodesulfurization activity of the resurrected catalyst to a level higher than that over the spent and industrially regenerated catalyst.
研究领域:
化学工程
·
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）