Catalysis Science & Technology
·
2024
·Vol. 14
·期 14
·4058-4067
·
IF 4.4
Yang You,Aijie Xu,Yao Lv,Lide Yang,Xuan Tang,Jie Tang,Yanglong Guo,Yao Cui,Wangcheng Zhan,Li Wang,Yun Guo,Sheng Dai
Complete oxidation of propane has drawn great attention in the fields of automotive emission control and volatile organic compound elimination. However, it is challenging to achieve high activity of this reaction due to the stability of propane. We here utilize a facile solvothermal method to construct tri-coordinated Al (AlIII) sites on the as-synthesized ST-Al2O3 support to alter the properties of supported Pt species. It is demonstrated that AlIII sites facilitate the dispersion and electron enrichment of supported Pt sites. Thus, Pt/ST-Al2O3 exhibits a superior activity toward complete propane oxidation, showing a 6.7-fold improvement in the turnover frequency over commercial Pt/Al2O3 catalysts. Meanwhile, Pt/ST-Al2O3 possesses a distinct reaction route originating from its stronger C–H and C–C cleavage capability, while having excellent activity not only in complete propane oxidation but also in the complete oxidation of other alkanes (CH4, C2H6, and n-C4H10). In addition, the AlIII construction strategy is successfully extended to more cases, e.g., Pd/ST-Al2O3 with higher Pd dispersion and electron density. This work provides a promising strategy for the control of the oxide support for advanced design and synthesis of alkane oxidation catalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 18
·13770-13779
·
IF 2.019
Jiang Liyang,Qi Jiqiu,Sui Yanwei,Liu Xiaofeng,He Yezeng,Meng Qingkun,Wei Fuxiang,Sun Zhi,Jin Yunxue
We reported a facile route for the fabrication of Al-doped TiO 2 nanostructure for supercapacitor electrode materials through an in-situ oxidation of Ti–8Al alloy. Ti–8Al alloy was prepared through solidification route. After high-temperature oxidation, rod-like and wall-like Al-doped TiO 2 composites were formed on the surface of Ti–8Al alloy flake. This kind of novel structure consisted of numerous nanorods and nanosheets, exhibiting large open space. When applied for supercapacitor, Al-doped TiO 2 composites electrode materials exhibited excellent electrochemical performance. After oxidation at 650 °C for 100 h, the electrode can deliver the highest capacitance of 4650 μF cm −2 at the current density of 10 μA cm −2 as well as long-term cycling stability of 98.5% of the initial specific areal capacitance after 6000 cycles.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-11
·
IF 5.228
Li Xuewu,Shi Tian,Liu Cong,Zhang Qiaoxin,Huang Xingjiu
Aluminum alloys are vulnerable to penetrating and peeling failures in seawater and preparing a barrier coating to isolate the substrate from corrosive medium is an effective anticorrosion method. Inspired by the lotus leaves effect, a wetting alloy surface with enhanced anticorrosion behavior has been prepared via etch, deposition, and low-surface-energy modification. Results indicate that excellent superamphiphobicity has been achieved after the modification of the constructed hierarchical labyrinth-like microstructures and dendritic nanostructures. The as-prepared surface is also found with good chemical stability and mechanical durability. Furthermore, superior anticorrosion behaviors of the resultant samples in seawater are investigated by electrochemical measurements. Due to trapped air in micro/nanostructures, the newly presented solid-air-liquid contacting interface can help to resist the seawater penetration by greatly reducing the interface interaction between corrosive ions and the superamphiphobic surface. Finally, an optimized two-layer perceptron artificial neural network is set up to model and predict the cause-and-effect relationship between preparation conditions and the anticorrosion parameters. This work provides a great potential to extend the applications of aluminum alloys especially in marine engineering fields.
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PubMed
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APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Da Wang,Congbiao Chen,Jungang Wang,Litao Jia,Bo Hou,Debao Li
High thermal conductive Al 2 O 3 @Al composite synthesized via metallic Al powders corrosion method has been applied as support for preparing Co/Al 2 O 3 @Al catalyst for high exothermic Fischer-Tropsch synthesis. The prepared Al 2 O 3 @Al composite is a hierarchical macro-mesoporous structure and consist of two parts, namely the inner metallic Al and the outer Al 2 O 3 with two kinds of morphologies. Increasing the concentration of the corrosive NaOH or extending the corrosion time could increase the specific surface area of the composite. For the prepared Co/Al 2 O 3 @Al, Co 3 O 4 phase is located on the outer plate-like Al 2 O 3 layer. The Co/Al-0.03-20 possesses higher CO conversion and C 5+ selectivity due to the appropriate cobalt reducibility, dispersion and high thermal conductivity . The thermal conductive coefficient of Co/Al 2 O 3 @Al catalysts is 13–98 times of conventional Co/Al 2 O 3 . Compared to Co/Al 2 O 3 , the Co/Al 2 O 3 @Al shows higher CO conversion and C 5+ selectivity as well as lower CH 4 and CO 2 selectivity, which is attributed to the macro-mesoporous structure and high thermal conductivity. In addition, because of the high thermal conductivity, no heat disperser should be used and a homogeneous temperature gradient maintains within the catalyst bed for Co/Al 2 O 3 @Al.
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RSC Advances
·
2017
·Vol. 7
·期 75
·47539-47546
·
IF 3.108
Song Zhang,Chao Xu,Guoqing Zhai,Mingliang Zhao,Mo Xian,Yuxiang Jia,Zongjiang Yu,Fusheng Liu,Fangfang Jian,Weizhi Sun
A new type of bimetallic palladium and aluminum incorporated mobile crystalline materials (Pd–Al-MCM-41) as bifunctional catalysts has been hydrothermally synthesized. Characterization shows that these molecular materials exhibit an ordered mesoporous structure, high surface area and a good dispersion of palladium in the frame. The catalytic activity of the Pd–Al-MCM-41 for the dimerization–hydrogenation reaction system of β-pinene in one pot has been systematically studied. Pd0.5–Al30-MCM-41 (SiO2/Al2O3 = 30, 0.5 wt% palladium content) was found to be the best catalyst which gave a dimer yield of up to 64.7%. It is worth noting that palladium shows a good synergic catalytic effect with aluminum in the dimerization reaction and enhances the dimerization yield. Furthermore, the bifunctional catalyst displayed a good activity over 4 runs.
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RSC Advances
·
2014
·Vol. 4
·期 76
·40352-40358
·
IF 3.708
Xing Li,Yong-De Yan,Mi-Lin Zhang,Yun Xue,Hao Tang,De-Bin Ji,Zhi-Jian Zhang
The electrochemical reduction of Nd(III) was investigated on an inert W and a liquid Al electrode in molten NaCl–KCl eutectic salt. On both W and liquid Al electrodes, the reduction of Nd(III) ions to Nd(0) metal occurred in a single reaction step, which avoids the corrosion reaction: 2Nd(III) + Nd → 3Nd(II). Therefore, corrosion of Nd metal in this molten chloride media is not expected. The co-reduction behavior of Nd(III) and Al(III) ions was studied on a W electrode in NaCl–KCl–AlCl3–NdCl3 melts. Five kinds of Al–Nd intermetallic compound were detected via cyclic voltammetry and open circuit chronopotentiometry. Intermittent galvanostatic electrolysis was employed on liquid Al electrodes to extract Nd in the form of Al–Nd alloys in NaCl–KCl–NdCl3 melts. Nd, AlNd3, Al2Nd, and AlNd phases were identified by X-ray diffraction (XRD). With the increase of electrolytic time, the content of Nd-rich Al–Nd intermetallic compounds in the Al–Nd alloy increased. The morphology and micro-zone chemical analysis of the deposits were characterized by a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), and the Al11Nd3 phase was confirmed by EDS analysis.
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OPTICAL MATERIALS
·
2012
·
IF 2.023
Chundong Li,Jinpeng Lv,Zhiqiang Liang,Shulong Yao
The blue band optical absorption and green luminescence of ZnO phosphors doping with aluminum are systematic studied. The Al content is varied from 0.01 at.% to 1 at.%. SEM images illustrated that Al doping can effectively suppress the ZnO grain growth. XRD results clearly manifest that the Al solubility limit in ZnO is around 0.1 at.%. It is also found that the E 1 (LO) vibration mode in the Raman spectra exhibits a good correlation with the blue band optical absorption and green photoluminescence. The results revealed that both V O 0 and V O + can give rise to the E 1 (LO) vibration mode. We conclude that the V O and O i defects are the dominant reason of the green photoluminescence in ZnO phosphors, in oxygen-deficient and oxygen-rich conditions, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Tongtong Han,Yuanlong Xiao,Minman Tong,Hongliang Huang,Dahuan Liu,Luyan Wang,Chongli Zhong
A series of CNT@MIL-68(Al) composites with different carbon nanotubes (CNTs) loadings have been synthesized and characterized by SEM, TEM, PXRD, FT-IR, TGA, and N 2 adsorption. As evidenced from SEM and TEM images, the incorporation of CNTs can result in better dispersity of MIL-68(Al) in composites and smaller particle size than pure MIL-68(Al). Adding appropriate amounts of CNTs increases both the BET surface areas and the total volume of small micorpores (<16 Å), leading to largely improved performance of adsorptive removal of phenol from aqueous solution. In the industrial concentration range of phenol, the adsorption capacity of 0.75% CNT@MIL-68(Al) was improved up to 188.7% compared with the pristine MIL-68(Al), possibly due to the increase of small micropores introduced by the incorporation of CNTs. Regeneration experiments demonstrated that the composites are stable with good regenerability for at least five cycles. This work shows that the composites formed by the combination of CNTs and MOFs may find promising applications in liquid phase adsorption.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Benjamin Tawiah,Christopher Narh,Min Li,Liping Zhang,Shaohai Fu
A polymer-encapsulated colorful Al pigment (PCAP) for fabric coatings was successfully prepared by a combined sol–gel spray drying assisted in situ polymerization method, and the near-infrared (NIR) reflectance and ultraviolet protection factor (UPF) of the coated fabrics were investigated. TG-DSC, SEM, and antisolvent test results proved that the reactive dyes were chemically attached to KH-550 modified Al pigment via a covalent bond. The PCAP was stable in strong alkaline (pH 12) or acidic (pH 1) conditions. The NIR reflectance and ultraviolet protection factor (UPF) of PCAP coated cotton fabrics were 80.05% and 290.76, respectively, when the mass ratio of monomer to colorful Al pigment was 1:10 with the coating thickness of 50 μm. PCAP coated fabrics showed excellent color strength, and good washing and rubbing fastness with a relatively good handle.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Huimin Ruan,Changmeng Guo,Hongwei Yu,Jiangnan Shen,Congjie Gao,Arcadio Sotto,Bart Van der Bruggen
This study reports the fabrication of mixed matrix membranes (MMMs) using immersion precipitation phase inversion for promising application in desalination of dye solutions. Aromatic poly(m-phenylene isophthalamide) is used as the polymer material, and the metal–organic framework MIL-53(Al) is added to develop integrally skinned asymmetric membranes. Successful dispersion of MIL-53(Al) particles into the membrane-separating layer is confirmed by scanning electron microscopy. The optimum performance of the membranes is obtained at 0.5 wt % MIL-53(Al) concentration. In particular, the M-0.5 membrane is planned for use in separating dye/salt aqueous mixtures. It is observed that the M-0.5 membrane has a rejection for NaCl and Na2SO4 below 11% and 37%, respectively, in mixed salt/dye solutions. Additionally, the M-0.5 membrane is found to have a rejection rate of 83.9%, 98.3%, and 99.8% for nitroso-R salt, xylenol orange, and ponceau S, respectively, in mixed Na2SO4/dye solutions. The rejection rate for Na2SO4 is lower than that of some commercial nanofiltration membranes (NF90, NF270, and DK). The membrane is promising for dye desalination in industrial-scale applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ling Zhang,Long Chen,Yaobin Li,Yuexin Peng,Fang Chen,Liang Wang,Changbin Zhang,Xiangju Meng,Hong He,Feng-Shou Xiao
For human health and environmental protection, removal of formaldehyde (HCHO) has become a hot topic, and completely catalytic oxidation at room temperature has been identified as one of the efficient routes for solving this problem. Recently, it has been reported that zeolite-supported Pt catalysts are active for HCHO oxidation at low temperatures, but they are still unable to completely oxidize HCHO at room temperature. To enhance the activity, it has been suggested to increase the Pt dispersion and acidic density in the zeolite-supported Pt catalysts. We therefore chose Al-rich Beta as a zeolite support because abundant aluminum species in the zeolite framework are advantageous for increasing acidic density through ion-exchange of protons and for improving Pt metal dispersion through the metal-zeolite interaction by increasing the negative charge of the zeolite framework with positively charged metal ions. As we expected, the Al-rich Beta zeolite supported platinum catalyst is very active, giving complete oxidation of HCHO at room temperature. To the best of our knowledge, this is the first time the complete oxidation of HCHO at room temperature over a zeolite-supported noble metal catalyst has been realized. In addition to its extraordinary activity, this catalyst is also very stable and selective. The strategy of designing zeolite-supported noble metal catalysts might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants.
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MATERIALS LETTERS
·
2017
·
IF 2.572
Zhibo Wei,Deyi Jiang,Jie Chen,Xiaogang Guo
In this study, we reported a new method to fabricate superhydrophobic Al films by combination of HCl/H 2 O 2 etching and electrophoretic deposition process. Through this two-step method, multi-scale hierarchical structures were successfully introduced on the surface. After hydrophobization, the resultant surface showed an excellent superhydrophobicity with a water contact angle of 169.6° and a sliding angle of ca. 1°. Furthermore, the surface exhibited excellent mechanical durability and could withstand abrasion tests under 8 kPa for 60 cm without losing superhydrophobicity. It also maintained superhydrophobicity when exposed to air or water for a long-term period. This work provides a cost efficient method to prepare mechanically robust and stable superhydrophobic Al alloy surface.
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