JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
·
IF 2.8
Boyun Gao,Huijiang Huang,Mooeez Ur Rehman,Bin Ren,Yuruo Liu,Weipeng Fan,Pengfei Li,Lizhi Zhang,Yan Xu,Yujun Zhao
BACKGROUND The synthesis of fatty amines via fatty alcohol amination offers a promising avenue for environmentally friendly production, particularly when compared with the methods employing hydrocyanic acid which often involve significant emissions. RESULT This study explores the synthesis of n-hexylamine through one-step amination of n-hexanol utilizing a series of Ru-doped Ni catalysts supported over γ-Al 2 O 3 , achieving 61% n-hexanol yield, 35% dihylamine yield and 3.5% trihylamine yield at the n-hexanol conversion of 99%. CONCLUSION The characterization results of the catalysts revealed a significant interaction between ruthenium and nickel in the bimetallic catalysts, leading to the enhanced reducibility of Ni species and improved metal dispersion. Moreover, ruthenium species were found to play an important role in the dissociation of NH 3 into NH x (x = 1, 2), thereby significantly improving the dehydrogenation process of n-hexanol at Ni sites. The synergistic effect between the two kinds of metal sites emerges as crucial factor for the boosted alcohols amination process. © 2024 Society of Chemical Industry (SCI).
研究领域:
催化化学
·
环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaolei Song,Kechao Zhang,Ying Song,Zhenxin Duan,Qiang Liu,Yang Liu
Alumina nanofibers with excellent mechanical properties are an ideal candidate as the reinforcements for composites. In this study, alumina nanofibers were fabricated via electrospinning technique combined with the sol–gel method. Alumina precursor sol was prepared using aluminum nitrate and aluminum isopropoxide. The morphology, microstructure, and mechanical properties of the nanofibers prepared using polyvinyl alcohol, polyvinyl butyral, and polyvinyl pyrrolidone as the polymer templates after calcination at 900 °C were investigated and compared. The three fiber samples exhibited continuous structure and the same phase composition of γ -Al 2 O 3 . However, the surface roughness , diameter distributions, densification degrees, crystallization temperatures, grain sizes, tensile strength , and elastic modulus were completely different. Possible mechanisms for these differences were discussed on the basic of the homogeneity of spinning solutions, the decomposition behaviors of polymers, and the quantities and sizes of defects and grains. The findings of this study can help in understanding an often-neglected concept on the important role of polymer categories on the structure and properties of electrospun oxide nanofibers, particularly required with enhanced mechanical properties.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Hong Guo,Fei Shen,Weichang Guo,Dingyuan Zeng,Yuting Yin,Xiaogang Han
All-solid-state batteries with garnet-type solid electrolytes are expected to achieve high safety. However, poor contact between the cathode and the solid-state electrolyte remains a bottleneck in improving electrochemical performance. We propose an interface modification strategy by adopting nano γ-Al 2 O 3 as a co-sintering additive to address the interfacial issue. The Li|Li 6.75 La 3 Zr 1.75 Nb 0.25 O 12 |LiCoO 2 all-solid-state battery exhibits promoted capacities due to intimate interfacial contact between the cathode and the electrolyte after modification. This work provides a low-cost and convenient strategy to overcome the interfacial issue in all-solid-state batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Wenquan Sun,Biao Ma,Yongjun Sun,Huaili Zheng,Genchao Ma
In this work, the degradation of tetracycline (TC) in wastewater was investigated using the γ-Al 2 O 3 – Bi–(Sn/Sb) particle electrodes. Parameters affecting the degradation efficiency and energy consumption of the γ-Al 2 O 3 –Bi–(Sn/Sb) particle electrodes, such as electrical conductivity, initial pH, air flow, current intensity, plate distance, filling ratio, and initial wastewater concentration, were systematically investigated. Results showed that the optimal conditions were 4000 mS·cm - 1 conductivity, pH 6, 15 mL·min - 1 air flow, 0.1 A current intensity, 4 cm plate distance, 0.05 g·mL - 1 filling ratio, and 100 mg·L -1 wastewater concentration. More than 90% and 70% of TC and total organic carbon were degraded, respectively, under the optimal conditions. In addition, the γ-Al 2 O 3 –Bi–(Sn/Sb) particle electrodes had good stability and reproducibility.
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2011
·Vol. 29
·期 8
·732-736
·
IF 1.086
Caixia YU,Qu YANG,Lei SHA,Yingliang LIU
An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu 3+ . Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction (XRD), N 2 adsorption-desorption isotherms and transmission electron microscopy (TEM). The as-synthesized γ-aluminas had narrow pore-size distribution (5–7 nm), large surface area (246 m 2 /g) and high thermal stability (750–1000 °C). The luminous property of materials was characterized by Photoluminescence (PL) spectra. The γ-Al 2 O 3 :Eu 3+ materials had efficient luminescence, and the emission strength was related to the content of Eu 3+ .
研究领域:
材料科学
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纳米技术
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发光材料
·
溶胶-凝胶化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Yanzhao Gao,Xianglei Meng,Shiqi Huang,Hui Wu,Liantao Jiang,Yu Zhou,Yuting Song,Yanyan Diao
Gamma alumina is widely utilized for preparing the supported noble metal catalysts for the hydrogenation reaction. It is an effective strategy to improve the catalytic performance of catalysts via modifying gamma alumina with alkaline earth metal to regulate its surface acidity and electronic properties. Herein, Pd catalysts supported by Al 2 O 3 and Mg-modified Al 2 O 3 are synthesized via the wet impregnation method, and the effects of MgO doping on the structure, composition, and surface acidity of Pd/γ-Al 2 O 3 catalysts are investigated via X-ray diffraction patterns (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Temperature programmed desorption (TPD). The results show that Pd/MgO-Al 2 O 3 –2 (γ-Al 2 O 3 modified with 2 wt% Mg) has more metallic state palladium and weak acid sites and exhibits the best catalytic performance for the hydrogenation of perfluoro-4-methyl-2-pentene (D1). Density functional theory (DFT) calculations on Pd/Al 2 O 3 and Pd/MgO-Al 2 O 3 –2 catalysts are also performed to further explore the mechanism of D1 hydrogenation. The studies for Gibbs free energy of the potential reaction steps and intermediates reveal a complex process to generate the target product C 6 F 12 H 2 , and the rate-determining-step is the addition of the first hydrogen on the second carbon of perfluoro-4-methyl-2-pentene molecule.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuan Gao,Zhihui Li,Shuxing Zhang,Dongsheng Zhang,Xinqiang Zhao,Baoquan Zhang,Yanji Wang
Developing cost-effective and inherently safe methods for accelerating the sustainable production of value-added chemicals from biomass presents a promising solution to the current energy crisis. This study introduces heterogeneous copper species anchored on a γ-Al 2 O 3 catalyst (Cu/γ-Al 2 O 3 ) with high dispersibility and small Cu particle size, synthesized via a straightforward incipient-wetness impregnation method. This method facilitates the selective anaerobic dehydrogenation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) in the absence of any oxidant or hydrogen acceptor. An HMF conversion of 69.8 % and a DFF yield of 44.9 % were attained at 130 °C over a 12-h period. Extensive characterizations were conducted to elucidate the correlation between the catalyst’s structure and its dehydrogenation activity. The findings indicated that strong L-acid sites, elevated Cu dispersions, small Cu particle size and an increased number of Cu + active sites were conducive to enhanced dehydrogenation reactivity. The Cu/γ-Al 2 O 3 catalyst demonstrated superior catalytic efficiency and stability. A possible reaction mechanism is suggested, integrating DFT calculations with experimental observations. This research offers valuable insights into the selective conversion of HMF to DFF and encourages further exploration into the dehydrogenation of biomass alcohols into high-value chemicals under oxidant-free conditions.
研究领域:
化学工程
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可再生资源与环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunhan Bai,Xiaoshu Ding,Ying Sun,Yucong Song,Yanji Wang
The reverse water gas shift (RWGS) reaction is one kind of the catalytic conversion of CO 2 to reduce an enormous amount of CO 2 . However, the RWGS reaction has the safety hazards associated with the use of hydrogen and thermodynamic limitation. Therefore, this work proposes a new safe and efficient reaction route (CO 2 -MCH) to get CO from CO 2 and methylcyclohexane (MCH). Thermodynamic calculations showed that the equilibrium CO 2 conversion at 350 °C increased from 17.8 % of the RWGS reaction to 53.5 % of the CO 2 -MCH reaction. In the CO 2 -MCH reaction, the relationship of the catalytic performance with the metal dispersion, the Pt particle size and the acidity of Pt-based catalysts on the different supports was investigated, respectively. The results showed that the Pt/γ-Al 2 O 3 catalyst with high dispersion of Pt particles, small particle size and medium acidity had good activity and selectivity. The relationships among Pt loading and Pt particle size on the Pt/γ-Al 2 O 3 catalyst and the catalytic performance were evaluated. The Pt particle size gradually increased with the metal loading. A positive correlation was observed between Pt particle size and CO 2 conversion; a volcano-type relationship was observed between CO selectivity and Pt particle size. In the CO 2 -MCH reaction at 350 °C, 0.1 MPa, LHSV = 6 h −1 , the CO 2 conversion was 24.7 %, the CO selectivity reached 95.2 %, and the Pt/γ-Al 2 O 3 catalyst within 40 h showed good stability. Moreover, the mechanism of the CO 2 -MCH catalytic reaction over the Pt/γ-Al 2 O 3 catalyst was speculated.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhiyuan Yu,Chengyu Guo,Xinmei Pang,Yuge Shen,Mingtang Gao,Shenyuan Zhao,Yujun Wang,Guangsheng Luo
A coprecipitation method was developed for the synthesis of fibrous γ-alumina using serial membrane dispersion microreactors with a circulating continuous phase and high concentrations of NaAlO2 and Al2(SO4)3 as reactants. Owing to the ultra-high mixing intensity and reduction of supersaturation due to the large circular phase ratio, a large pore volume and specific surface area and an extremely narrow pore diameter distribution were realized using the high-concentration and high-viscosity precipitation system. The influence of the phase ratio, dispersion order of reactants, Al2(SO4)3 residence time, and the precipitation reaction pH and time were investigated, and the nanofiber formation mechanism was explored employing theoretical calculations. By controlling the Al2(SO4)3 residence time of 3 s, phase ratio of 16, and pH of 8.0, γ-Al2O3 nanofibers with a pore volume of 1.36 cm3/g, a specific surface area of 376 m2/g, and a length/diameter ratio in the range of 30–54 were obtained without any organic reagents. This study provides an economical and readily scalable method for the synthesis of fibrous γ-Al2O3 with excellent pore properties and a large specific surface area, which can potentially be applied as an excellent catalyst support for diesel and bio-oil hydrogenation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 69
·期 3
·e17895
·
IF 4.167
Xuyu Wang,Fu Yang,Jianjian Yi,Jiejing Kong,Juanjuan Gong,Aihua Yuan,Zebao Rui,Hongbing Ji
Rational engineering of noble metal/transition metal bimetallic catalysts is considered as an effective way to constructing synergistic effect between adsorbed oxygen and hydroxyl for enhanced catalytic formaldehyde oxidation. Herein, we developed a Pt–Ni bimetallic catalysts loading on γ-Al 2 O 3 support for room-temperature formaldehyde oxidation. Catalytic experiment results showed that the conversion rate was >97% with a >100 h stability. Several noble metals (Pd, Au, and Ag) were compared to identify the activity effect in formaldehyde oxidation. The activity and stability test in different atmospheres and in situ infrared test suggested that the PtNi/γ-Al 2 O 3 has the best activity and stability. At a meantime, the results also demonstrated that Pt sites motivate more surface adsorbed oxygen through activating ambient oxygen molecules, while the neighboring Ni atoms contribute to adsorbed hydroxyl, thereby offering sustainable activity. The high efficiency and stability of PtNi/γ-Al 2 O 3 catalysts for formaldehyde oxidation could be a promising candidate for air purification.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Daoan Sun,Chunying Li,Yuan Li,Yongmei Du,Chuyi Zhang,Jiangwei Li,Jian Lu
JP-10 as a representative polycyoalkane has high energy density and volumetric hydrogen storage capacity, which makes it very suitable for hydrogen production onboard by catalytic reforming. Monometallic Ni and bimetallic Ni-M (M = Fe, Co, and Cu) catalysts supported on γ-Al 2 O 3 were prepared by incipient-wetness co-impregnation method. Effects of the second metal M on the catalytic performance of Ni/γ-Al 2 O 3 for hydrogen production by steam reforming of JP-10 were investigated in a coated microchannel reactor. The catalysts were characterized by N 2 adsorption–desorption, XRD, XPS, TEM, NH 3 -TPD, TG, H 2 -TPR, and Raman techniques. The results showed that the catalytic performance of Ni-M/γ-Al 2 O 3 deeply depended on the second metal M, in which Ni-Fe/γ-Al 2 O 3 was the best in terms of JP-10 conversion (82.9 %), H 2 selectivity (63.9 %), and coke amount (0.091 g coke/g cat. · h) under reaction conditions of 750 °C, 1.0 bar, steam to carbon of 2.4, weigh hourly space velocity of 472 h −1 . The doping of Fe formed highly dispersed Ni 3 Fe alloy crystallite for NFeA catalyst, and the average particle size is about 12.2 nm. Fe facilitated surface migration of Ni 0 species resulting in higher surface concentrations of Ni 0 species, thus enhanced the catalytic activity. In addition, Fe moderated the interaction between the support and nickel oxide particles, and promoted the reducing property of calcined catalysts overall, which ensured excellent resistance to sintering and high activity. The amount of weak and medium acid in the reduced NA catalyst were increased due to the presence of Fe, which improved activity and simultaneously avoided severe carbon formation. After reaction, NFeA catalyst produced much whisker graphite carbon, while the spent NA catalyst mainly generated amorphous carbon. NFeA catalyst maintained good stability over time on stream of 50 h, and severe carbon deposition, rather than the sintering of the active components, was the main cause of the catalyst deactivation. This work may provide important guidance for catalyst design applied to steam reforming of polycyoalkanes.
研究领域:
催化化学
·
能源材料科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-14
·
IF 2.4
Wang Xiangke,Meng Xuan,Shi Li,Liu Naiwang,Wang Jiyu
In the tert-butyl removal reaction, solid acid catalysts have emerged as a preferred alternative to liquid acid catalysts due to their environmentally friendly advantages. Various zeolites, such as ZSM-5, MCM-41, USY, and H beta, as well as mesoporous materials, such as γ-Al 2 O 3 and active clay were employed for the first time to prepare m-cresol through the tert-butyl removal reaction of 4,6-di-tert-butyl-m-cresol (4,6-DBMC). γ-Al 2 O 3 and active clay catalysts were found to have excellent catalytic performance in this reaction. The thermodynamic properties of the tert-butyl removal reaction of 4,6-DBMC were studied. Under different temperature and solvent conditions, the product distribution was investigated. A proposed reaction pathway and mechanism were proposed. And through cyclic experiments, the stability of γ-Al 2 O 3 and active clay catalysts was investigated separately. After six cycles, the m-cresol yield for active clay catalyst was still maintained at about 90%. The causes of deactivation of the two catalysts were analyzed. After regeneration, both catalysts exhibited good regeneration performance. This study offers a basis for the selection of solid acid catalysts for the tert-butyl groups removal of 4,6-DBMC. Graphical abstract
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）