CARBOHYDRATE POLYMERS
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2014
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IF 3.916
Guozhi Fan,Chongjing Liao,Tao Fang,Shanshan Luo,Guangsen Song
The acetylation of cellulose using sulfonated Amberlyst 15 as a new and reusable catalyst was investigated. Optimization of the acetylation process was carried out by variation in the amount of added catalyst, acetic acid, and acetic anhydride as well as the reaction conditions, which includes reaction time and reaction medium. Cellulose acetate, with a degree of substitution (DS) value of 2.38 and yield of 54.1%, was obtained under the optimized conditions and characterized using Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis–derivative thermogravimetry (TGA–DTG), and differential scanning calorimetry (DSC). The sulfonated polymer catalyst could be easily recovered by centrifugation after acetylation. Both the fresh and recovered catalysts were characterized by means of FTIR, TGA–DTG, DSC, and scanning electron microscopy (SEM), and the recovered catalyst could be successfully reused without further treatment. It was found that Amberlyst 15 possessed excellent catalytic stability, no significant changes in the DS values, and consistent yields of cellulose acetate observed over four reaction cycles.
研究领域:
化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
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2018
·Vol. 3
·期 2
·390-395
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IF 0
Siquan Xu,Chunyu Yin,Donghui Pan,Feng Hu,Yuanfeng Wu,Yanan Miao,Lijing Gao,Guomin Xiao
In this study, a series of Fe3+ modified Amberlyst-15 resins (Fe/AR) were prepared and used as environmentally friendly bifunctional catalysts for the conversion of glucose to 5-hydroxymethylfurfural (HMF). The physicochemical properties of the Fe/AR catalysts were characterized by XRD, SEM-EDX, XPS, TG-DTA and FTIR spectroscopy techniques. It was found that the 10%-Fe/AR catalyst has the ability to synergistically catalyze the isomerization of glucose and the dehydration of fructose in a “one-pot” reaction, and allows an impressive 68% HMF yield to be achieved in the H2O/THF biphasic system. Moreover, the 10%-Fe/AR catalyst still retained the desired catalytic activity after four consecutive cycles.
研究领域:
化学工程
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催化化学
✓ 已验证
DOI
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yilun Dong,Kang Xue,Zexing He,Chongjun Li,Ruijie Gao,Zhen-Feng Huang,Chengxiang Shi,Xiangwen Zhang,Lun Pan,Ji-Jun Zou
The efficient and cost-effective implementation of ammonia borane (AB) hydrolysis dehydrogenation for hydrogen storage is crucial. This study investigated the role of solid acid Amberlyst-15 (A-15) for hydrogen evolution from AB hydrolysis. Notably, AB hydrogen evolution rate can reach 194.15 ml·min −1 at 30 °C, with a low apparent activation energy of 8.20 kJ·mol −1 . After five cycles of reuse, the reaction involving A-15 could keep a conversion rate of about 93%. The AB hydrolysis follows quasi first-order kinetics with respect to the AB concentration and quasi zero-order kinetics with respect to the A-15 mass. According to the characterization results of XRD, ATR-FTIR, and in-situ MS, the boric acid was the dominant hydrolyzate, while water as a hydrogen donor in this reaction. Furthermore, based on the reasoning that hydrogen bonds between A-15 and AB (aq) promotes the diffusion of AB, release of H 2 and the cleavage of O—H bond of H 2 O, a possible mechanism was proposed.
研究领域:
化学工程
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材料科学
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能源储存
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2018
·
IF 3.024
Lincai Peng,Xueying Gao,Xin Yu,Hui Li,Junhua Zhang,Liang He
An integrated multistep catalytic process in a one-pot cascade model to realize conversion is preferred in terms of process economics and energy efficiency. Here, we present the noble-metal-free but highly effective catalytic transfer hydrogenation and acid-catalyzed conversion of biomass-derived furfural for direct production of biofuel alkyl levulinate using alcohols as the hydrogen donor and reaction medium. With optimization of the process variables, a high yield of alkyl levulinate at up to 85.3% could be captured under mild conditions in isopropanol medium with the combination of Zr-MCM-41 and Amberlyst-15 catalysts. The reaction proceeds via the catalytic transfer hydrogenation of furfural to furfuryl alcohol over Zr-MCM-41, which is then converted to alkyl levulinate by an Amberlyst-15 acid catalyst. The spent hybrid catalysts could be effectively recovered from the resulting reaction mixture and reused 5 times with little deactivation after plain regeneration treatment.
研究领域:
化学工程
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Honglei Zhang,Fengyu Tian,Lingyun Xu,Ruichao Peng,Yingjie Li,Jie Deng
Biodiesel, a mixture of fatty acids alkyl esters (FAAE), has recently received great concern as an excellent alternative to the petro-based diesel fuel. However, the production of biodiesel at commercial scale is obstructed by both cost of feedstock and the homogeneous catalyst system. To overcome these challenges, Amberlyst-15/Poly (vinyl alcohol) membrane (A-15/PVA) with catalytic and water-adsorbing dual functions have been prepared by a simple phase inversion method. The as-prepared A-15/PVA exhibited excellent catalytic activity and reusability in both batch and continuous esterification of acidified oil from waste cooking oil (WCO) with methanol for biodiesel production. The produced biodiesel exhibited high qualified properties and stability and can be directly applied in current diesel engines without modifying the engines. The exhaust of the biodiesel and biodiesel-blend could decrease the smoke opacity, carbon monoxide, hydrocarbon, while increase the nitrogen oxide emissions. The A-15/PVA demonstrated great potential in industrial production of biodiesel with high qualities from WCO.
研究领域:
化学工程
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2018
·
IF 3.463
Jing Liu,Yuena Ge,Yueqin Song,Ming Du,Xiaolong Zhou,Jin'An Wang
This work reports a new technical approach for the production of aviation gasoline through the catalytic dimerization of iso-butene on sodium exchanged Amberlyst-15 resins (20–40 mesh) in the absence of selectivity-enhancing components at T = 50 °C, P = 2 MPa and LHSV of 2 h −1 . The dimers selectivity could be significantly improved by effectively controlling the acid capacity of resins via Na + exchange. When the acid capacity of the catalyst was controlled to <2.45 mmol/g, the 2,4,4-trimethylpentenecontent in C8 olefins reached ~100%. It was also confirmed that the sodium exchanged resins have longer lifetime than Amberlyst-15 resins.
研究领域:
催化化学
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石油化学工程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Tianqing Zhou,Chaojian Zhang,Lungang Chen,Yue Yao,Shuxiang Lu,Xiaoyuan Liao
The direct synthesis of 2,5-furandicarboxylic acid (FDCA) from readily renewable fructose, would provide a cost approach without separation of 5-hydroxymethylfurfural (HMF). The method would realize efficient and continuous production, reduced by-products, without cumbersome HMF separation process, and reduced production costs. In this work, we succeeded in converting fructose directly into FDCA over combined Amberlyst-15 and Pd/Al 2 O 3 in fixed bed reactor. We firstly time, compared One-bed two-catalysts (OBTC), and two-bed two-catalysts (TBTC) system. For the individual merits of the Amberlyst-15 and Pd/Al 2 O 3 , the catalytic performance of the combined beds is significantly improved compared with individual one. The high yields of FDCA (48 %) and fructose conversion (100 %) were obtained, respectively. Our one-step continuously method makes the FDCA production much more economical, energy-saved.
研究领域:
化学工程
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可再生资源利用
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Weidong Lu,Zihao Xu,Meiyuan Li,Youheng Ma,Zijun Xiao
Deacidification is a critical step in alkali catalyzed transestrification of acidic oil for biodiesel production. In this work, optimization of the process variables and insights into the mechanisms of deep eutectic solvent (DES) assistance of deacidification of acidic oil catalyzed by Amberlyst 15 were investigated. Specifically, response surface methodology (RSM) and Box-Behnken Design (BBD) were employed to optimize the three process variables, namely temperature, catalysis loading, and molar ratio of methanol to oleic acid . Furthermore, the catalysts before and after used with and without DES assistance were characterized by FTIR and XRD in order to elucidate the chemical mechanisms involved in the process. Results showed that maximum deacidification rate (DR) of 98.02% was achieved in the deacidification process assisted by DES at the optimal process conditions (temperature 72.02ºC, catalyst loading 5.05 wt%, and methanol to oleic acid molar ratio 33.02), compared to 89.68% of the control (without DES assistance). Data analysis and verification results further confirmed the suitability of BBD and RSM methods in optimizing the process. More interestingly, dramatic higher catalytic activity (DR of 76.33% vs 64.16%) of Amberlyst 15 with DES assistance compared to that of the control after 4 cycles was observed. Finally, FTIR spectra confirmed that less water absorbed onto the surface of Amberlyst 15 with DES assistance was the major reason for higher DR and better catalyst reusability in comparison with the control.
研究领域:
化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
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2021
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IF 3.605
Xiangbo Song,Yuhe Liao,Yuting Zhu,Pengyao Sun,Lungang Chen,Longlong Ma,Hongwei Yang,Chenguang Wang
Highly effective production of 5-hydroxymethylfurfural (HMF) from biobased sugar is one of the vital steps for the synthesis of a fuel precursor. In this work, a slow-release effect of proton from a heterogeneous catalyst induced by 1-butyl-3-methylimidazole chloride ([Bmim]Cl) ionic liquids was found and employed to effectively convert biobased fructose to HMF. Under mild conditions of 100 °C and 60 min, a promising HMF yield of 94.6% with a fructose conversion of 99.1% could be achieved in a tetrahydrofuran solvent over the synergy of Amberlyst-15 with [Bmim]Cl, owing to the slow-release effect. Based on extensive control experiments and characterizations, a mechanism of slow release of proton induced by [Bmim]Cl was proposed to better understand the catalytic performance, mainly involving that proton in the −SO3H group of Amberlyst-15 was gradually replaced by the [Bmim]+ of the [Bmim]Cl additive. Additionally, the effect of various parameters (e.g., different ionic liquids and solvents, the loading of the ionic liquid and catalyst, and reaction temperature and time) was systematically investigated. Meanwhile, the stability of Amberlyst-15 and [Bmim]Cl was tested; both could be reused four times. This work provides a novel and highly effective strategy for conversion of biomass-based feedstock toward fuel precursors.
研究领域:
化学工程
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生物质转化
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催化科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Miao Zuo,Kai Le,Yunchao Feng,Caixia Xiong,Zheng Li,Xianhai Zeng,Xing Tang,Yong Sun,Lu Lin
In this study, we put forward an effective two-step method of producing biofuel 5-ethoxymethylfurfural (5-EMF) from carbohydrates with DES mixture. With the catalysis of Amberlyst-15, 77.3% and 65.2% yield of 5-EMF were obtained respectively from the fructose and inulin in mild conditions. In addition, CrCl 3 modified Amberlyst-15 showed excellent catalytic performance in the aldoses dehydration, 46.7% and 50.2% of 5-EMF yield could be obtained from glucose and sucrose in the two-step reactions. Moreover, all catalysts used in this study could be effectively reused for several times.
研究领域:
生物化学
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2012
·
IF 2.947
Hui-xue Ren,Han-jie Ying,Ping-kai Ouyang,Ping Xu,Jing Liu
Efficient and pollution-free catalysts play an essential role in the ultimate biodegradation of products in the synthesis of biodegradable and recyclable poly( l -lactic acid) (PLLA). Therefore, macroporous resin was utilized as the solid acid for the first time, on which lactate that could be absorbed in vivo was composited to catalyze the synthesis of PLLA. It was discovered that macroporous resin Amberlyst-15 showed good catalytic activity in oligomerization and polymerization, and lactate showed different catalytic efficiencies due to the differences in ionic radius and ionic charge. Compared to the traditional catalysts of SnCl 2 ·2H 2 O/TSA, the composite catalyst can improve the quality, yield and optical purity of its product, which can also be recycled without any residual in products. PLLA with molar mass of about 110,000 g mol −1 was synthesized at the yield of 93%. The product exhibits pure color (white), and its optical purity and crystallinity are 98% and 55%, respectively. A possible catalytic mechanism was proposed. The resulting PLLA products were characterized by GPC, 1 H NMR, DSC, and polarimeter.
研究领域:
材料科学
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生物工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
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2023
·
IF 4
Wu Jinsheng,Yang Ruinan,Zhao Shiqiang,Chen Wei,Chen Zhiyong,Chang Chun,Wu Haoran
The development of mild strategies to transform of fructose to prepare high-purity 5-hydroxymethylfurfural (HMF) is of great significance for biomass valorization, and the design of an efficient catalytic approach is crucial. Herein, a mild catalytic strategy was developed to achieve the preparation of high-purity HMF from fructose over Amberlyst-15 catalyst in a water-methyl isobutyl ketone (MIBK) biphasic system under atmospheric pressure and lower temperature (90 °C). The catalytic system was optimized and analyzed by response surface methodology and kinetics study. Results indicated that a 46.6% yield of HMF could be obtained under optimal conditions: 80 wt% Amberlyst-15 catalyst, the mass ratio of MIBK to H 2 O 10, and the reaction time of 7 h. Furthermore, a simple and efficient purification strategy of HMF was established. High purity (99.0%) and recovery rate (65.5%) of HMF were obtained. This work provides an efficient catalytic strategy to produce high-purity HMF from fructose under atmospheric pressure and lower temperature.
研究领域:
生物化学
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催化化学
✓ 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）