Molecular Catalysis
·
2024
·
IF 3.9
Zhijiao Huang,Yong Liu,Lungang Chen,Xinghua Zhang,Jianguo Liu,Chenguang Wang,Qi Zhang,Longlong Ma
2,5-dimethylfuran (DMF), a promising biomass-derived fuel, is synthesized via the hydrodeoxygenation of 5-hydroxymethylfurfural (HMF). This study focuses on the inherent activity of a 5Pt5Fe/C catalyst for HMF hydrodeoxygenation to DMF. The catalyst exhibited exceptional performance, achieving a remarkable DMF yield of 99.6 %. It displayed specific selectivity for C = O bond hydrogenation and C O bond cleavage in diverse substrates, producing high yield of 2-methylfuran from furfural and furfury alcohol, and high yield of toluene from benzaldehyde, benzyl alcohol. In-depth characterizations unveiled valuable insights into the 5Pt5Fe/C catalyst's properties, emphasizing a harmonious balance between metal and acid sites due to the interactive synergy between Pt and Fe species, enhancing hydrodeoxygenation activity. Additionally, the catalyst demonstrated satisfactory stability, maintaining a commendable DMF yield over five reaction cycles despite observed changes.
研究领域:
化学工程
·
催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xing Gao,Suyang Tian,Yunyun Jin,Xiaoyue Wan,Chunmei Zhou,Rizhi Chen,Yihu Dai,Yanhui Yang
Highly selective liquid-phase hydrogenation of furfural was efficiently catalyzed by PtFe alloy nanoparticles supported on CeO2. An initial reaction rate at ∼1500 h–1, a near 100% selectivity toward furfuryl alcohol (FA), and a satisfactory recycling stability were achieved on Pt3Fe/CeO2 catalyst. Based on the well-established knowledge of the modification effects of Fe additives on the geometric and electronic properties of Pt sites, this work further demonstrated that the bimetallic PtFe sites could promote H2-activated dissociation for accelerating the hydrogenation reaction in comparison with the monometallic Pt/CeO2 catalyst. The results of isotopic and kinetic experiments to study the solvent effects elucidated that the reaction pathway of catalytic transfer hydrogenation with isopropanol as the hydrogen donor could be ruled out. The results also suggested that isopropanol-involved hydrogen exchange processes with hydrogen and FA could easily occur during the reactions. Furthermore, the furfural hydrogenation could be significantly affected by the solvent intermolecular hydrogen bonding interactions.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shixue Liu,Zhuo Jiao,Chengcai Li,Tong Xu,Guojin Liu,Hailin Zhu,Yuhai Guo,Xueliang Jiang,Jiuming Li,Xiang Yin
Combining membrane separation with advanced oxidation technology can make the membrane self-cleaning, extending its service life. However, the preparation of composite membranes with excellent catalytic ability, self-cleaning performance, and stability remains a key research direction. In this study, a PTFE composite membrane with peroxymonosulfate activation self-cleaning ability was successfully prepared by in-situ growth of CoOOH and ZIF-67 on the surface of a l -DOPA/PEI modified PTFE membrane. The as-prepared membrane is superhydrophilic and has significant superoleophobic surfaces underwater, the separation efficiency of the as-prepared membrane for multiple oil-water emulsions exceeded 98.4 %. Meanwhile, the effective degradation of several organic dyes under visible light was simulated, with still high degradation efficiency (>99 %) after 10 cycles. Overall, this study puts forward a approach towards self-cleaning membranes based on PTFE material; the resulting composite membrane's high separation efficiency, stability under repeated use conditions as well as its self-cleaning ability position it as an attractive candidate for long-term wastewater purification applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lu Zhang,Di Yang,Zhigao Ma,Zijian Deng,Zhou Li,Dietmar Drummer,Bingyan Jiang
Polymeric micro features tend to deform and break under the demolding force during injection molding process, which becomes a bottleneck problem limiting its precision manufacturing. To reduce the polymer-mold interfacial adhesion, nickel-polytetrafluoroethylene (Ni-PTFE) nanocomposite molds with low surface adhesion and high wear resistance were manufactured via pulse current electroforming. The electrodeposited Ni-PTFE nanocomposite showed a good hydrophobic property and low friction coefficient (between 0.1 and 0.3) than pure nickel (0.78). Compared with direct current, pulse current electrodeposition was beneficial to reduce the crystallite size and internal stress, thus improving the wear resistance and reducing the cracking defects. The hardness of pulse current electrodeposited Ni-PTFE reached 442.3 HV, which was 51.7 % higher than that of pure nickel. Compared to nickel mold, Ni-PTFE nanocomposite mold significantly improved the dimensional accuracy of molded microfluidic chips. This study systematically investigates the Ni-PTFE nanocomposite electroforming process under both direct and pulse currents, which provides a new approach for the manufacturing of high-performance precision injection mold insert.
研究领域:
制造工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Chengwen Yu,Lecheng Liang,Zhangyan Mu,Shaoqi Yin,Yuwen Liu,Shengli Chen
In the pursuit of high-performance proton exchange membrane fuel cells (PEMFCs), obtaining durable Pt-based intermetallic catalysts with small particle sizes for oxygen reduction reaction (ORR) stands as a crucial yet challenging topic. Herein, we propose an idea of catalyst design utilizing Fe-phenanthroline (Phen) complex as precursor to integrate metal-nitrogen-carbon (M-N-C) with the strong anchoring effect into carbon shells, synthesizing highly ordered and small-sized (3.59 nm) PtFe intermetallic catalyst coated with iron-nitrogen-carbon (FeNC) shells (L1 0 -PtFe@FeNC). The strong Fe-Phen interaction ensures the uniform dispersion of Fe species on Pt seeds so as to form protective shells suppressing the agglomeration and dissolution of PtFe nanoparticles (NPs) under the high-temperature annealing or harsh operational conditions. It exhibits excellent mass activity (MA) that is about five-fold increase compared to the commercial Pt/C, as well as the significantly improved MA retention after 30,000 potential cycles (68.2% vs. 45.3%). Nitrogen-doped carbon (NC) shells and pure carbon (C) shells are used as comparison to demonstrate the advantages of FeNC shells. Durability test results show that NC and C shells obviously degrade after potential cycles, while well-preserved FeNC shells guarantee catalyst stability. Theoretical calculations reveal that the strong binding between FeNC shells and the Pt surface enhances the stability of both the nanoparticles and the FeNC shells.
研究领域:
催化
·
纳米材料
·
电化学
·
燃料电池
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Shanshan Li,Chuanping Gao,Chunjian Duan,Shengmao Zhang,Pingyu Zhang,Zhijun Zhang
Oil-based superlubricity introduces a novel approach to energy conservation. Facing two main obstacles at present, i.e., higher viscosity of lubricating oil and special tribopairs, a novel solid-liquid combined system is built in this work, which is mainly based on excellent tribological property of oil-soluble dialkyl-dithiophosphoric-modified Cu nanoparticles (DDP-Cu NPs) and superior self-lubricating capability of polymeric tribopairs. In this system, polyetheretherketone (PEEK) is coupled with polytetrafluoroethylene (PTFE) to form a similar/dissimilar tribopair; and neat PAO40 (a real serving lubricating oil with high viscosity in poly-alpha olefin oil family), or PAO40 containing oil-soluble DDP-Cu NPs (PAO40 + Cu), is used as a lubricant during the sliding test. The results show that only dissimilar tribopair, i.e., PEEK-PTFE, can achieve oil-based superlubricity under the selected sliding conditions, which can be attributed to the synergistic effect between PEEK-PTFE tribopair and PAO40/PAO40 + 0.25 Cu. Furthermore, due to lower cohesive energy density (CED), PTFE is more likely to be transferred onto PEEK together with some tribochemical reactions, finally generating a high-performance tribofilm rich in carboxylated PTFE. In addition, it is concluded that, when lubricated with PAO40, the above synergistic effect is a key to achieve superlubricity; and for PAO40 + 0.25 Cu, the carboxylated PTFE and the exposed Cu core will create chelate effect, which can not only further enhance this synergistic effect, but also improve the wear-resistance of the system reaching near-zero wear. This work not only provides a novel idea for designing oil-based superlubricity system, but broadens the type of tribopair materials achieving oil-based superlubricity to some extent.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2025
·
IF 2.8
Huihui Jin,Nannan Jiang,Yujia Chen,Zhijie Feng,Haoying Cheng,Lunhui Guan
Enhancing catalytic activity, durability and reducing costs are major challenges in commercialization of proton exchange membrane fuel cells (PEMFCs). Non-precious metal catalysts face durability challenges when applied to PEMFCs, while platinum (Pt)-based catalysts are hampered by their high costs and weak interactions with carbon supports, limiting their application in PEMFCs. Combining Pt-based catalysts with iron-nitrogen-carbon (FeNC) supports can improve the oxygen reduction reaction (ORR) performance. However, traditional preparation methods for FeNC supports, such as liquid-phase and hydrothermal synthesis, are cumbersome and have low yield. Here, we introduce a simple ball-milling method to synthesize FeNC with high yield that achieves a high-surface-area and uniform dispersion of Fe atoms. The FeNC support anchors PtFe nanoparticles at FeNₓ sites. This enhances support-alloy interactions and suppresses particle aggregation. The obtained catalyst denoted as PtFe/B-FeNC exhibits an exceptional mass activity of 2.57 A mgPt-1 at 0.9 V, representing a 12.2-fold increase compared to the commercial Pt/C. There is only 30 mV degradation for the catalyst after 120k cycles, indicating outstanding stability. This research paves the way for the green synthesis of PtFe/B-FeNC with high yield, facilitating the development of commercial materials for other electrochemical devices.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 8
·1121
·
IF 4.9
Weihua Cao,Xiao Yang,Zhenjie Song,Jia Geng,Changxin Liu,Ning Zhang,Xiaowen Qi
With the aim of developing a wear-resistant ultraviolet (UV)-cured self-lubricating coating, this study investigated the impact of matrix components and lubricants on UV-cured interpenetrating polymer network-polyurethane acrylate (IPN-PUA) self-lubricating coatings. Four coatings with different monomer combinations were prepared, using isophorone diisocyanate (IPDI) or tolylene-2,4-diisocyanate (TDI) in combination with hydroxypropyl acrylate (HPA) or 2-hydroxyethyl acrylate (HEA). These coatings were denoted as IPDI-HPA, IPDI-HEA, TDI-HPA, and TDI-HEA, respectively. The surface morphologies, compositions, friction and wear properties, as well as the comprehensive performances were investigated. The results indicated that IPDI-HPA had the lowest surface roughness and that TDI-HEA had the smallest wear rate, while TDI-HPA showed the best overall performance (roughness of 1.485 μm, coefficient of friction (COF) of 0.746, and wear rate of 10.64 × 10−14m3/N·m). With TDI-HPA as the matrix, graphite and polytetrafluoroethylene (PTFE) particles of different sizes were added as lubricants. The T-P-25F (TDI-HPA coating with 25 μm sized PTFE) coating had self-lubricating capabilities, as was manifested by a friction coefficient of 0.395, which was 47% lower than that of the pure TDI-HPA coating, and it simultaneously showed outstanding wear-resistance performance. The wear rate of the T-P-25F coating was 3.97 × 10−14m3/N·m, 62.7% lower than that of the pure TDI-HPA coating. This research provides valuable guidance for optimizing the performance of such coatings and yields a self-lubricating coating with excellent wear resistance.
研究领域:
材料科学
·
表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Sha Yu,Guodong Kang,Zhihao Zhu,Meiqing Zhou,Haijun Yu,Yiming Cao
Nafion-PTFE hollow fiber composite membranes were fabricated and applied in vacuum membrane distillation (VMD) process to improve the anti-fouling and anti-wetting performance in the presence of oil and surfactant . The composite membrane exhibited an underwater super-oilphobic property according to the contact angle test. The VMD performance when treating saline feed containing 3.5 wt% NaCl and 1000 ppm mineral oil for the composite membrane behaved a stable flux for 40 h. In construct, an immediate and sharply-declined flux was observed for the pristine PTFE , indicating the significant improvement in the anti-fouling property. Meanwhile, the composite membrane also alleviated the wetting phenomena caused by the surfactant comparing with the pristine PTFE membrane, and the Nafion-PTFE composite membrane behaves a stable flux and high salt rejection higher than 99.99% for 60 h treating saline feed containing O/W emulsions. The pressure depression effect of the Nafion layer on the mass transfer was analyzed. It was found that the depression could be reduced with the increasing of the feed temperature and the enhancement of the corresponding effective pore diameter of the Nafion layer, that the pressure depression factor decreased from 0.23 to 0.04 with the feed temperature increasing from 60 °C to 75 °C.
研究领域:
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Kun Wang,Feng Wang,Yu Hai Guo,Hong Yan Tang,Hua Peng Zhang
The polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared through a cold pressing method including paste extruding, stretching and sintering in this study. Membrane vacuum regeneration technology (MVR) was developed as a novel regeneration technology for regeneration of the absorbent. The membrane structures of the PTFE hollow fiber membranes were investigated. The mixture of N-methyldiethanolamine and piperazine was selected as the absorbent. The PTFE hollow fiber membranes were used for regeneration through vacuum membrane regeneration technology. The CO2 regeneration flux and regeneration ratio increased with the increase of the regeneration temperature and the CO2 loading. The regeneration pressure was negative to the regeneration flux and regeneration ratio. When the flow rate of the rich solution increased, the regeneration ratio decreased and CO2 regeneration flux increased significantly.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2025
·
IF 0
Xu Qian,Zheng Zhihong,Zhang Jingyun,Luo Jinjing,Chen Jianwen,Lai Zheng
A series of manganese-iron-based (MnFeOx) polytetrafluoroethylene (PTFE) catalytic filter materials were prepared by combining acid pretreatment and ultrasound-assisted coupling method to achieve simultaneous treatment of nitrogen oxides and dust. Surface acid pretreatment of the filter materials can improve PTFE’s surface roughness and provide more attachment sites for catalyst loading. The ultrasound-assisted coupling technology significantly improves the loading capacity of the catalyst and the bonding strength with the filter material. Compared to previous catalytic filter materials, the preparation of the optimal catalytic filter material in this study had achieved gratifying catalytic performance (NO conversion of 95% at 200 ℃) and could reach 99.95% filtration performance. In addition, the catalytic filter material also exhibited outstanding catalyst stability and mechanical properties of filter material, which made the catalytic filter material suitable for complicated working conditions. The functional integrated filter material has great significance for the collaborative treatment of multiple pollutants and could significantly benefit future development of air pollution control.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jinxue Cheng,Qinglin Huang,Yan Huang,Wei Luo,Quan Hu,Changfa Xiao
Novel poly(tetrafluoroethylene) (PTFE) membranes with regular geometric pore structure were fabricated via near-field electrospinning (NFES) method. Firstly, computer aided design (CAD) was utilized to design membrane's pore geometry (triangle, diamond, square, hexagon and their different size). Secondly, the PTFE spinning solution consisted of PTFE emulsion and carrier (PVA aqueous solution) was electrospun into nascent PTFE/PVA membrane, which had regular geometric pore structure. Finally, the nascent membrane suffered sintering process, and the NFES PTFE membrane was obtained. Effects of PTFE/PVA mass ratio, sintering temperature and annealing condition, pore geometry on the membrane morphology, structure and properties were investigated, respectively. Results found that the square membrane showed good combination of membrane performances and properties, when PTFE/PVA mass ratio was 6:1 and sintered at 380 °C followed by cooling in muffle furnace. Owing to the excellent hydrophobicity , the obtained PTFE membranes exhibited excellent oil/water separation performance in terms of high oil flux (707 L m -2 h -1 ) without extra pressure, and high separation efficiency (rejection up to 99.6%). Owing to the regular and accurate pore structure, the PTFE membrane was utilized in the particle sequential separation. The mixed silica (SiO 2 ) particles with a series of diameter (1, 5, 10, 20 μm) were sequential separated by PTFE membranes with different pore geometry, and the rejection reached up to 82.0%.
研究领域:
材料科学
·
环境工程
✓ 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）