Catalysts
·
2017
·Vol. 7
·期 10
·311
·
IF 3.082
Xing Li,Haiyang Zhang,Baochang Man,Lijuan Hou,Chuanming Zhang,Hui Dai,Mingyuan Zhu,Bin Dai,Yanzhao Dong,Jinli Zhang
The Ru-based catalysts, including Ru/AC (activated carbon), TPAP (tetrapropylammonium perruthenate)/AC, TPAP/AC-HNO3, and TPAP/AC-HCl, were prepared and assessed for the direct synthesis of vinyl chloride monomer. The results indicate that the TPAP/AC-HCl catalyst exhibits the best performance with the conversion falling from 97% to 91% in 48 hours’ reaction under the conditions of 180 °C, a GHSV(C2H2) of 180 h−1, and the feed ratioVHCl/VC2H2of 1.15. The substitution of RuCl3precursor with high valent TPAP species leads to more ruthenium oxides active species in the catalysts; the acidification treatment of carrier in TPAP/AC catalyst can produce an enhanced interaction between the active species and the modified functional groups on the carrier, and it is beneficial to inhibit the carbon deposition and sintering of ruthenium species in the reaction process, greatly increase the adsorption ability of reactants, and further increase the amount of dominating active species in the catalysts, thus improving the catalytic performance. This also provides a promising strategy to explore high efficient and economic mercury-free catalysts for the hydrochlorination of acetylene.Keywords:tetrapropylammonium perruthenate;acetylene hydrochlorination;Ru catalysts
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Qiao Ding,Ning Li,Bo Wu,Qing Cheng,Qi Zhao,Tong Liu,Rui Wang,Deyu Li
In this study, SO 2 was used to chemically modify the commonly used leveling agent polydimethyldiallylammonium (PD) in through-hole electroplating, resulting in a more effective leveling agent, PDS, which improved the throwing power (TP), leading to through-hole circuit boards with better metal coverage in difficult-to-reach areas. Furthermore, theoretical and experimental studies were conducted to understand how the −SO 2 structure influences the leveling ability of the leveling agent. The study demonstrates that the −SO 2 -modified additive significantly enhances the copper plating process, resulting in thicker and more uniform deposits in through-holes, which are critical for ensuring high-quality circuit boards.Additionally, this study elucidates the mechanism of action of the leveling agent on the copper surface, providing theoretical support for the development of copper plating leveling agents. The leveling ability differences between the leveling agents PD and PDS were investigated using Cyclic Voltammetry, constant current method, and Electrochemical Impedance Spectroscopy. Additionally, the optimal concentrations of the additives were determined. Quantum chemical calculations were employed to analyze the electrostatic potential, HOMO/LUMO orbitals, and differential charge density on the Cu (111) surface for both leveling agents. These theoretical analyses provided insights into the reasons behind the differing leveling abilities of the two agents.
研究领域:
材料科学
·
电化学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Peng Zhang,Fan Yang,Xuedong Zhu,Weizhong Zheng
In this work, a kind of ZSM-5 zeolite with one-dimensional fins growing along the [010] direction has been successfully synthesized utilizing both tetrapropylammonium hydroxide (TPAOH) and tetramethylammonium hydroxide (TMAOH) as co-templates. With the aid of molecular dynamic simulations and a series of experimental evidences, the formation mechanism of the one-dimensional feature is determined to arise from the synergic effects between TPA + and TMA + . Two TPA + and three TMA + would co-exist in a unit MFI cell at a certain crystallization period depending on the composition of zeolite and precursor, and this configuration ensures a minimum stabilization energy required for the growth along [010] direction. Investigations manifest these needle-like fins with diameters of ca. 60 nm could function as pseudo nano crystals and introduce additional pores ranging from 10 to 90 nm, which effectively promotes the diffusion capability and substantially improves the catalytic performance in propane aromatization.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 8
·272
·
IF 3
Juan Du,Xiang Wan,Caixiong Song,Kangsheng Wu,Wenbing Yang,Beiye Liu,Qi Yang,Jingjing Fang,Ayesha Razzaq
Crystal twinning, a common growth phenomenon, can substantially affect material performance in fields such as semiconductors, nonlinear optics, and drug development, yet its elimination during crystallization is challenging. This study presents a method for the controlled synthesis of ZSM-5 zeolite as either single crystals or twinned crystals using kaolin as the primary raw material. The method leverages the etching effect of ammonium fluoride (NH4F) on the aluminosilicate structure derived from pre-treated kaolin. By adjusting the concentrations of NH4F and the structure-directing agent tetrapropylammonium bromide (TPABr), pure ZSM-5 single crystals and twinned crystals were selectively synthesized. Conventionally, NH4F is employed to introduce defects into zeolite structures. In contrast, this work demonstrates its utility in controlling crystal habit. The synthesis utilizes kaolin, an abundant and low-cost aluminosilicate mineral, to provide the entire aluminum source and a portion of the silicon source, offering an economical alternative to expensive precursors like aluminum isopropoxide. The resulting single and twinned crystals exhibited high crystallinity, demonstrating the viability of using natural minerals to produce high-quality zeolites. The physical and chemical properties of the kaolin-derived ZSM-5 were characterized and compared to those of ZSM-5 synthesized from conventional chemical reagents. A growth mechanism for the formation of single and twinned crystals is also proposed.
研究领域:
材料科学
·
晶体学
·
无机化学
·
纳米技术
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Qingbo Xu,Xinyu Wang,Peng Wang,Yanyan Zhang,Zongqian Wang
There are two major problems associated with the use of antibacterial cotton fabric. The durability of the fabric is poor, and the inherent properties of the fabric deteriorate following the execution of the finishing processes. These limit the application of antibacterial fabric. We first treated the cotton fabric with acryloyl chloride (AC) molecules to make the surface of the fabric rich in carbon‑carbon double (C=C) bonds. Following this, the [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (DMES) monomer was polymerized with the C C bonds on the fabric following the “grafting through” method. As a result, the cotton fabric was successfully grafted with the poly[2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (PDMES), exploiting covalent bonds . The finished fabric exhibited excellent antibacterial effects. The bacterial reduction (BR) rates of the finished fabric against E. coli and S. aureus were greater than 99.0 %. Even after 50 washing cycles, the BR rates of the finished fabric against E. coli and S. aureus were greater than 96.0 %. In addition, the use of the “self-created” mist polymerization technology ensured that the inherent properties of the finished fabric were retained to a large extent. Therefore, the antibacterial cotton fabric prepared following this method can be potentially used for the fabrication of industrial and household textiles.
研究领域:
纺织科学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Peirong Liu,Yingrui Xiao,Zhou Yang,Shouwu Yu,Xianguang Meng
Lead-free double perovskite has become a candidate material for green optoelectronic applications due to its low toxicity and human-friendly characteristics. Double perovskite has a huge application prospect in the field of optical detectors, especially X-ray detection in recent years. By introducing propylammonium (PA), we have grown a larger size 2D double perovskite (PA) 4 AgBiBr 8 single crystal . While inheriting the high stability of the 2D material , it also exhibits good X-ray response. The constructed planar Au/(PA) 4 AgBiBr 8 /Au X-ray detector displays a sensitivity of 6.89 μC Gy −1 cm −2 under 40 V bias voltage and 40 keV X-ray radiation.
研究领域:
材料科学
·
光电技术
·
辐射检测
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 12
·5229-5233
·
IF 4.177
Chen-Yu Mao,Wei-Qiang Liao,Zhong-Xia Wang,Peng-Fei Li,Xing-Hui Lv,Heng-Yun Ye,Yi Zhang
A novel zigzag chain organic–inorganic hybrid compound of the general formula R2MI5, [n-C3H7NH3]2[SbI5] (1), was successfully synthesized, in which the n-propylammonium cations were located in the free cavities between the one-dimensional zigzag chains. Systematic characterization was performed to investigate the phase transition of 1. A pair of sharp peaks at 211.8 K (heating) and 203.7 K (cooling) with a hysteresis 8.1 K were observed in the differential scanning calorimetry (DSC) curve, indicating the first-order phase transition behavior of 1. The temperature dependence dielectric measurement demonstrated a step-like change at around 211.8 K, which makes 1 a potential switchable dielectric material. Frequency dependence measurement revealed that the frequency exerts a weak influence on the dielectric permittivity. Further structural analysis shows that both anionic and cationic moieties contribute to the phase transition, accompanied by weak hydrogen bond interactions between cations and the [SbI5]n2− chains.
研究领域:
材料科学
·
固体化学
·
介电材料
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 22
·7930
·
IF 3.748
Ze-Kun Zhang,Shi-Peng Ding,Ze Ye,Ding-Li Xia,Jun-Ting Xu
In this work, the advanced all solid-state block copolymer electrolytes (SBCPEs) for lithium-ion batteries with double conductive phases, poly(ethylene oxide)-b-poly(trimethyl-N-((2-(dimethylamino)ethyl methacrylate)-7-propyl)-ammonium bis(trifluoromethanesulfonyl) imide) (PEO-b-PDM-dTFSI)/LiTFSI, were fabricated, in which the charged PDM-dTFSI block contained double quaternary ammonium cations and the PEO block was doped with LiTFSI. The disordered (DIS) and ordered lamellae (LAM) phase structures were achieved by adjusting the composition of the block copolymer and the doping ratior. In addition, the presence of the hard PDM-dTFSI block and the formation of the LAM phase structure resulted in a good mechanical strength of the solid PEO-b-PDM-dTFSI/LiTFSI electrolyte, and it could maintain a high level of 104Pa at 100 °C, which was around 10,000 times stronger than that of the PEO/LiTFSI electrolyte. Based on the good mechanical and electrochemical properties, the PEO-b-PDM-dTFSI/LiTFSI SBCPE exhibited excellent long-term galvanostatic cycle performance, indicating the strong ability to suppress lithium dendrites.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Linjie Guan,Meiyu Liu,Honghai Liu,Li Zhang,Yiming Zhang,Yucai Qin,Binbin He,Yi Mei,Yun Zu
The regulation of the engineering regionally spatial framework aluminum (Al F ) distribution in MFI channels has been considered as an effective way for the production of light olefins by targeted fluid catalytic cracking (TCO) technology. In this work, ZSM-5 zeolites with controlled Al F distributions are facilely synthesized by tuning the combinations of pentaerythritol (PET), tetrapropylammonium (TPA) and Na cations. The Al F atoms in the prepared HZ5-[PET + Na] and HZ5-[TPA] samples are enriched in the straight channels and intersection channels, respectively, which are favorable to the n-butane monomolecular reaction pathway, promoting the propylene production. Whereas the Al F atoms in the HZ5-[TPA + Na] sample are simultaneously distributed in both the straight and intersection channels, the n-butane molecules preferentially take place monomolecular reaction in the straight channels to generate carbonium ions (e.g., C 2 H 5 + , C 3 H 7 + and C 4 H 9 + ). Subsequently, all of them enter into the intersection channels to induce the occurrence of bimolecular reaction. Such a process is conducive to the formation of ethylene. These insights can help to clarify the catalytic behavior of regional framework acid sites in ZSM-5 channels and then provide an effective approach to design efficient TCO catalysts.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Feng Guo,Yunen Liu,Kai Jiao,Rui Yang,Mingxiao Hou,Xing Zhang
Currently, the only treatment for moderate and severe aortic valve calcification disease is valve replacement. The clinical use of bioprosthetic heart valves (BHVs) is limited because of device failure caused by structural degeneration, such as the calcification of BHV leaflets. In the present study, poly(ethylene glycol) diacrylate (PEGDA) was incorporated with zwitterion (2-[methacryloyloxy]ethyl)dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA) forming a balanced charged network, which was further used to modify decellularized heart valves (DHV) and improve anticalcification properties. Valvular prostheses were designed and manufactured to comply with the requirements of ISO-5840 for valve fluid dynamics (i.e., effective orifice area = 1.9 cm2, regurgitant fraction = 1.5% for Φ25 mm surgical valve at heart stroke of 80 mL). Weight loss of artificial heart valves (PEGDA-SBMA-DHV) was less than 5.5% after enzymatic hydrolysis for 12 h. No obvious calcification was observed in artificial heart valves that were modified with PEGDA-SBMA, whereas calcification was found in decellularized heart valves and the PEGDA-modified group. Furthermore, histological staining results indicated that artificial heart valves (PEGDA-SBMA-DHV) with a balanced charged network elicited negligible inflammation. Thus, balanced charged networks of PEGDA-SBMA with cationic and anionic groups can prevent the transportation of Ca2+ ions and enzyme molecules, conferring efficient anticalcification properties to artificial heart valves.
研究领域:
生物医学工程
·
材料科学
·
心血管医学
✓ 已验证
产品关联
DOI
PubMed
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