Catalysis Science & Technology
·
2024
·
IF 4.4
Peng Wang,Shaowen Hou,Pengxiang Tu,Bing Xue,Weixin Guan,Dong Wang,Danfeng Zhou,Yajun He,Xinhui Chen,Yixing Wang,Kegong Fang,Xiaonian Li,Jun Ni
As a sustainable, environmentally friendly, and economically viable way to produce 1,3-butadiene, the ethanol-to-butadiene (ETB) process has received increasing attention recently. This ETB process normally requires catalysts with suitable acidity and basicity, namely an acid–base balance. However, the origin of acid–base balance has not yet been elucidated. Herein, we demonstrate that by finely coordinating the interaction of ZnO and ZrO2, a butadiene productivity of 0.33 gBD gcat−1 h−1 at low WHSV and 1.39 gBD gcat−1 h−1 at high WHSV can be achieved. In contrast, pure ZnO prefers ethanol dehydrogenation to acetaldehyde and pure ZrO2 favors ethanol dehydration to ethylene and diethyl ether. Through a variety of characterization techniques, we found that the interaction of ZnO and ZrO2 alters the acidity and basicity of catalysts, resulting in volcanic shapes of ethanol conversion, butadiene selectivity, and butadiene yield in the ETB process. These findings provide in-depth insights into the understanding of the ETB process and may also apply to other reaction systems using ZnO–ZrO2 as catalytically active components.
研究领域:
化学工程
·
催化
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
RUBBER CHEMISTRY AND TECHNOLOGY
·
2016
·Vol. 89
·期 4
·700-711
·
IF 0.878
Hong Kan,Ni Xufeng,Shen Zhiquan
Organic supporter poly(styrene-co-divinylbenzene) (PS-DVB) was synthesized, and gas-phase polymerization of 1,3-butadiene was performed with PS-DVB–supported Nd(vers) 3 /Al 2 Et 3 Cl 3 /Al(i-Bu) 3 catalysts. Millimeter-sized granules of high cis -1,4 content (>98%) polybutadiene with an M n of 5.3–5.5 × 10 5 were obtained. Dispersants used in gas-phase polymerization of 1,3-butadiene have a significant influence on apparent activities of catalysts and appearance of products. The morphology of polybutadiene granules was also investigated by scanning electron microscopy.
研究领域:
高分子化学
·
催化化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2016
·
IF 3.586
Qinzhuo Zhou,Anqi Wang,Lu Dai,Suyun Jie,Bo-Geng Li
A series of hydroxyl functionalized polybutadienes has been prepared by combining the oxidolysis and reduction of cis -polybutadiene rubber (BR). For the first time, multi-hydroxyl polybutadiene (MHPB) with α,ω- and intrachain hydroxyl groups was synthesized through the simultaneous reduction of –CHO and epoxy groups in epoxidized aldehyde group terminated polybutadiene (EATPB) by sodium dihydro-bis-(2-methoxyethoxy) aluminate (Red-Al). The corresponding hydroxyl functionalized polyethylenes , including hydroxyl-terminated polyethylene (HTPE), multi-hydroxyl polyethylene (MHPE) and hydroxyl-terminated polyethylene with ethyl branches (FHTPE), were readily obtained via the hydrogenation of C=C double bonds in the functionalized polybutadienes with TSH/TPA regents. The microstructures of all the products were confirmed by 1 H NMR, 13 C NMR and FT-IR, and their thermal properties were determined by TGA and DSC . It has been indicated that the linear HTPE and MHPE possessed high initial thermal degradation temperature, high degree of crystallinity , and high melting temperature due to their stereoregular microstructure. However, the FHTPE obtained through the hydrogenation of HTPB from free radical polymerization had much lower degree of crystallinity and melting temperature due to the presence of more ethyl branches.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Li Xu,Suyun Jie,Zhiyang Bu,Bo-Geng Li
As a telechelic polymer, the primary amine-terminated cis -polybutadiene (AmTPB) has a wide application prospect due to its active hydrogens in both end groups and high cis 1,4-chain structure. In this work, the AmTPB with high cis -1,4 content (>96%) was prepared for the first time by taking cis -polybutadiene as a starting material. Firstly, the aldehyde-terminated polybutadiene (ATPB) in a molecular weight range of 600–8000 g/mol was successfully synthesized by oxidative degradation of epoxidized polybutadiene prepared by reaction-controlled phase-transfer catalysis. After a simple post-processing, the AmTPB was prepared via two steps, i.e. the efficient synthesis of oxime-terminated polybutadiene (OTPB) from ATPB and the subsequent selective reduction of OTPB. The results showed that the high cis 1,4-chain structure of polybutadiene did not change in all the reactions.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2016
·Vol. 37
·期 4
·1016-1021
·
IF 1.114
Jieting Geng,Xin Wang,Jing Hua
High vinyl polybutadiene-graft-(hydroxyl-terminated butadiene–acrylonitrile copolymer) (HVPBR-g-HTBN) was successfully synthesized through the copolymerization of butadiene and HTBN using a molybdenum (Mo)-based catalyst. The results indicated that the grafting coefficient of the product was <1 and the nitrogen content of the product was higher than that of linear HVPBR, demonstrating the grafting during the copolymerization by the Mo-based catalyst. Upon grafting, the intrinsic viscosity of the product's solution was lower, while the molecular weight was higher than that of linear HVPBR. Moreover, the apparent viscosities of concentrated solutions of grafted products were lower than the linear counterpart, despite their higher molecular weight.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 2
·2100702
·
IF 4.367
Yiming Wang,Zhen Yu,Ajit Dattatray Phule,Yongxian Zhao,Shibao Wen,Zhen Xiu Zhang
Herein, a developed microcellular foam from polybutadiene rubber (BR) and styrene butadiene rubber (SBR), which is prepared by prevulcanization, supercritical foaming, and secondary vulcanization processes is reported. It has excellent abrasion resistance and with low density. The foaming process is successfully achieved with the assistance of eco-friendly supercritical nitrogen (sc-N 2 ). The microstructural analysis of BR/SBR foams indicates that the cell structure of BR/SBR foams has an obvious effect with the increased prevulcanization time. The thickness of solid skin on the foam surface is observed using scanning electron microscope, which revealed that the prevulcanization time is also a direct factor influencing the thickness of solid skin, where the fundamental cause is explained from two aspects, i.e., gas escape and rubber vulcanization. The prevulcanization time to meet the abrasion resistance characteristics has determined based on the cell structure and abrasion solid skin thickness of BR/SBR foams at different time zone of prevulcanizations. As a result, BR/SBR foams prepared by this process have a low relative volume loss (62.6–117.1 mm 3 ) and a desirable density (0.50–0.71 g cm −3 ) at a prevulcanization time of 15–17 min.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 2
·46934
·
IF 1.901
Lu Dai,Xixi Wang,Zhiyang Bu,Bo-Geng Li,Suyun Jie
Carboxyl-terminated polybutadiene (CTPB) is a widely used telechelic liquid rubber, which is mainly prepared by anionic or free-radical polymerization of 1,3-butadiene. It is known that the microstructure of liquid polybutadiene rubber largely affects its processability and mechanical properties. However, it is hard to control its microstructure in the free radical or anionic polymerization. In this study, a series of CTPB with high cis -1,4 content has been prepared for the first time via the oxidolysis and selective oxidation of cis -polybutadiene rubber (BR). Hydrogenation of their CC double bonds with p -toluenesulfonyl hydrazide/tri- n -propylamine (TSH/TPA) reagents afforded carboxyl-terminated polyethylenes (CTPE). For comparison, commercial CTPB (FCTPB), prepared by free-radical polymerization of 1,3-butadiene, was also hydrogenated and gave FCTPE with more ethyl branches. Linear CTPE (L-CTPE) was synthesized by ring-opening metathesis polymerization of 1,5-cyclooctadiene in the presence of maleic acid and subsequent hydrogenation. The microstructure of the polymers was established by FT-IR, 1 H NMR, 13 C NMR, and GPC and their thermal properties were determined by DSC and TGA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46934.
研究领域:
高分子化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2015
·
IF 2.173
Shuai Lv,Suyun Jie,Bo-Geng Li
A series of bis{[2-(4,5-diphenylimidazolyl)phenylimino]phenolate}cobalt(II) complexes ( C1 – C4 ) has been synthesized and characterized. Single-crystal X-ray analysis demonstrated that the cobalt center was coordinated by two [NNO – ] ligands and adopted a slightly distorted octahedronal geometry. The type of cocatalyst had a remarkable influence on the catalytic properties and ethylaluminum sesquichloride (EASC) was proved to be more efficient for the polymerization of 1,3-butadiene to produce higher conversion of butadiene and cis -1,4 content of polybutadienes . On activation with EASC, all the cobalt complexes displayed high catalytic activity for the polymerization of 1,3-butadiene. The microstructure determined by FT-IR and NMR spectra demonstrated that high cis -1,4 contents in the resulting polymers were obtained. The conversion of butadiene , microstructure, molecular weight and molecular weight distribution of polybutadienes were influenced by the reaction parameters and ligand structure .
研究领域:
高分子化学
·
配位化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Qingxu Zhang,Huilong Xu,Yihu Song,Qiang Zheng
Hydroxyl-terminated polybutadiene (HTPB) liquid is used to mediate the dispersity of fumed silica in cis -polybutadiene rubber (BR) to prepare nanocomposites. The introduction of HTPB promotes the dispersion of both hydrophilic and hydrophobic silicas (A200 and R974), which improves the reinforcement efficiency, delays the onset strain amplitude of nonlinear softening and enlarges the high-order harmonics in the nonlinearity region. Influence of HTPB on the linear and nonlinear rheological responses are well accounted for by data superposition on the basis of the rheological responses of the matrix. It is evidenced for the first time that the rheological nonlinearity may be enhanced in the case of improved filler dispersity. This is understandable taking the intrinsic nonlinearity of the matrix and the strain amplification effect induced by filler into consideration.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Qinzhuo Zhou,Suyun Jie,Bo-Geng Li
Hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content (>95.0%) has been prepared via a two-step method by taking commercial butadiene rubber (BR9000) as a starting material, including the one-pot synthesis of aldehyde-group-terminated polybutadiene (ATPB) in high efficiency and the subsequent reduction reaction. The double bonds distributed in linear polybutadiene were first epoxidized and then cleaved at the exact epoxidized sites. The epoxidation reaction by 3-chloroperbenzoic acid and chain-cleavage reaction by periodic acid are controllable, highly efficient, selective, and quantitative. Along with an epoxy percent increase, the molecular weight of ATPB prepared via a one-pot method decreased with a relatively narrow polydispersity index. The aldehyde groups in the chain ends were reduced by NaBH4 to produce HTPB, in which the high cis-1,4 content of BR was retained.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 4
·277
·
IF 3.8
Fei Yuan,Xudong Li,Jianying Dou,Baojia Zhang,Xueling Song,Lin Li,Junjie Liu,Yanyan Li,Yigao Jiang,Hui Wang
Seed emulsion polymerization was an effective modification method to improve not only the properties of polymers but also the compatibility between different polymers by designing special core-shell structures. In this study, poly (butadiene-styrene-vinyl pyridine) (VPR)/poly (acrylonitrile-butadiene) (NBR) core–shell nanoparticles (VPR/NBR) were prepared by seed emulsion polymerization using VPR as seed emulsion and butadiene and acrylonitrile as monomers. Subsequently, HVPR/HNBR was obtained by direct hydrogenation of the core–shell nanoparticles in latex using Wilkinson’s catalyst under high temperature and H2pressure. It is noteworthy that the unsaturated C=C double bonds in the core (VPR) and shell (NBR) of HVPR/HNBR nanoparticles were reduced simultaneously during the hydrogenation process without obvious sequence. The particle size and size distribution of the particles remained consistent before and after hydrogenation, indicating that the synthesized core-shell nanoparticles have excellent stability. This study provides a new perspective on the chemical modification of NBR and promises an environmentally friendly “green” process for the industrial hydrogenation of unsaturated elastomers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2018
·Vol. 22
·期 4
·222-229
·
IF 3.081
Gao Meixiang,Jiang Haoxi,Zhang Minhua
Series of ZrO 2 supported on the different kinds of SiO 2 carriers were applied in the reaction of 1, 3-butadiene formation from ethanol and acetaldehyde. ZrO 2 /Nano-SiO 2 performed the best performance with the 1, 3-butadiene selectivity 91.43% and the total conversation 52.39%. Prepared catalysts were characterized by N 2 adsorption–desorption, TEM, XRD, temperature-programmed desorption of NH 3 and CO 2 , FTIR spectroscopy of adsorbed pyridine and CO 2 , Raman XPS. The results show that the weak Lewis acid and basic sites are appropriate for BD formation. Furthermore, more and balance acid-basic sites are rather important for the reaction of ethanol and acetaldehyde conversion to BD.
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
危险品化学品经营许可证（带存储）