Energy & Environmental Science
·
2013
·Vol. 6
·期 3
·994-1007
·
IF 11.653
Qi Song,Feng Wang,Jiaying Cai,Yehong Wang,Junjie Zhang,Weiqiang Yu,Jie Xu
Valorization of native birch wood lignin into monomeric phenols over nickel-based catalysts has been studied. High chemoselectivity to aromatic products was achieved by using Ni-based catalysts and common alcohols as solvents. The results show that lignin can be selectively cleaved into propylguaiacol and propylsyringol with total selectivity >90% at a lignin conversion of about 50%. Alcohols, such as methanol, ethanol and ethylene glycol, are suitable solvents for lignin conversion. Analyses with MALDI-TOF and NMR show that birch lignin is first fragmented into smaller lignin species consisting of several benzene rings with a molecular weight of m/z ca. 1100 to ca. 1600 via alcoholysis reaction. The second step involves the hydrogenolysis of the fragments into phenols. The presence of gaseous H2 has no effect on lignin conversion, indicating that alcohols provide active hydrogen species, which is further confirmed by isotopic tracing experiments. Catalysts are recycled by magnetic separation and can be reused four times without losing activity. The mechanistic insights from this work could be helpful in understanding native lignin conversion and the formation of monomeric phenolics via reductive depolymerization.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 5
·1-6
·
IF 1.615
Hu Kai,Yuan Ye,Yan Peiyao,Zhou Changlin,Lei Jingxin
It is a challenge to simultaneously retain high performance and green synthesis process of polyurethane (PU). Here, a PU was synthesized completely using ethanol as solvent based on the chain extender, hexanediamine (HMD), with higher reactivity towards isocyanate groups than ethanol. Chemical components in PU prepared by a green process (GPU) were characterized by Fourier Transform Infrared Spectroscopy (FTIR). Molecular weight and its distribution of GPU were characterized by Gel Permeation Chromatography (GPC). Mechanical properties and thermal-mechanical properties of GPU were characterized by Electronic Tensile Testing Machine and Dynamic Thermomechanical Analysis (DMA) separately. The glass transition temperature (Tg) and thermal stability of GPU were characterized by Differential Scanning Calorimeter (DSC) and Thermogravimetric Analysis (TGA). Results showed that this GPU presented superior mechanical properties of 61.4 MPa and low saturated water absorption of 6.6% compared with conventional solvent-based PU and waterborne PU whose synthesis process contained some toxic organic solvent.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Shuohan Yang,Yonghou Xiao,Wuyue Zhang,Yu Qiao,Qidong Zhao,Ning Zhang,Gaohong He
Cuprous ion-based zeolites have been proven as promising carbon monoxide (CO) adsorbents by virtue of their excellent adsorption and regeneration properties due to π complexation. However, existing preparation methods still suffer from the problems of a cumbersome process and low loading amounts of cuprous ions. Herein, we proposed a one-step synthesis strategy of using ethanol as a solvent to provide a reducing protective environment, which enabled the facile and controllable preparation of highly dispersed CuCl over 5A zeolites. Using CuCl as a copper source, to ensure the integrity of the 5A zeolite structure, CuCl species were directly loaded onto the 5A support in one step. Ethanol solution could effectively protect Cu(I) from being oxidized by oxygen in air and improve the stability of cuprous ions in Cu(I)/5A adsorbents. The results demonstrated that the Cu(I)/5A prepared by this method exhibited a superior CO adsorption performance to the pristine 5A zeolite. The adsorption capacity of CO over Cu(I)/5A attained 3.44 mmol·g–1 at 298 K and atmospheric pressure, which was evidently superior to those of CuY (2.7 mmol·g–1) and CuSAPO34 (1.84 mmol·g–1) reported in the literature, while the adsorption capacity of H2 was only 0.069 mmol·g–1 under the same condition. According to the ideal solution adsorption theoretical model, CO was preferentially adsorbed and the IAST selectivity of CO in the CO/H2 binary mixture over Cu(I)/5A was about 273.4. This study provides a novel and effective way to synthesize high-efficiency CO adsorbents.
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
ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Jinxu Xi,Daqian Ding,Yi Shao,Xiaohui Liu,Guanzhong Lu,Yanqin Wang
The efficient usage of lignocellulosic biomass is of great significance for large-scale low-cost biomass conversion to biofuels and other useful chemicals. Here, an interesting catalytic process was reported related to converting cellulose into ethylene glycol (EG) and ethylene glycol monoether (EGME) in methanol over a Ru/NbOPO4 catalyst, with the cleavage of a C–C bond by NbOPO4 and further hydrogenation by supported Ru particles. The influence of reaction temperature, hydrogen pressure, and reaction time was systematically investigated and showed that a 54.5% total yield of EG and EGME could be obtained at 220 °C in 3 M Pa H2, which was an exciting result. Meanwhile, the effect of solvent was also studied in detail. It was shown that methanol played an important role in the production of EG and EGME, especially in the cleavage of the C–C bond. Methanol could protect the C═O bond in glucose produced from cellulose through acetalization, thus prevent its hydrogenation, and led to the production of EG and EGME. Furthermore, the influence of dopants (W, Sn, Ni, Cu) was further investigated, and it was found that only the Ru–Ni/NbOPO4 catalyst was more effective through limiting the further hydrogenolysis of products (EG and EGME) to CO and alkanes, and as high as 64% total yield of EG+EGME was achieved. Moreover, the Ru–Ni/NbOPO4 catalyst showed good reusability, which can be reused at least four times with a little loss in EG and EGME yield.
研究领域:
化学工程
·
生物质能转化
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Feng Tan,Hao Cui,Dongdong He,Yue Hao,Wenhui Ma,Yunkung Zhao,Yibo Liu,Chengxiong Wang,Feng Liu,Jian Liu,Kezhu Jiang
The polyol solvent thermal reduction method holds great promise for synthesizing Pt-based alloy nanoparticles with commercial viability. However, there is a lack of understanding regarding how various alcohols impact the size, shape, and electrocatalytic properties of particles. To bridge this knowledge gap, we systematically investigated the mechanisms behind the effects of four common alcohols on product characteristics using the polyol solvent thermal method. Our efforts led to the successful synthesis of small, uniformly distributed nanoparticles. Notably, the PtCo/C-BA catalyst, synthesized using benzyl alcohol, exhibited exceptional electrocatalytic activity for the oxygen reduction reaction (ORR). It achieved a remarkable current density of 0.437 A mg −1 and demonstrated minimal mass activity decay after 20,000 cycles. The X-ray Photoelectron Spectroscopy characterization reveals that the PtCo/C-BA catalyst exhibits a higher proportion of metallic-like valence states for Pt and Co, which favors the ORR process. This work not only deepens our understanding of the synthesis strategy but also establishes a foundation for designing high-performance ORR catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jin Wang,Xiaoting Hong,Gangming Fang,Xuegang Zhang
The increasing production of industrial waste salt has become a growing concern. These waste salts are usually filled or deposited without treatment, causing serious environmental pollution and a waste of salt resources. The ideal solution to this problem is to recycle the waste salts after the removal of organic pollutants. In this study, organic solvent washing and heating are chosen to deeply remove the organic pollutants from actual pesticide waste salts. The experimental results showed that the optimum removal efficiency of organic pollutants in waste salts achieves as high as 99.82% under the conditions of 3:5 mass-to-volume ratio of waste salts-to-ethanol (EA), heating temperature of 400 °C (60 min). In addition, the removal mechanism and migration pathways of organic pollutants in the washing and heating were proposed. Salts washing with EA could remove most of the organic pollutants and subsequent heating treatment could completely purify the waste salts without the emission of the harmful gaseous compounds. As the best eluent, EA can not only effectively remove organic pollutants, but also be readily recycled. At the same time, the EA washing and heating process could avoid the pollution of organic waste liquid and noxious tail gas. Therefore, the EA washing process has the advantages of green, high efficiency, safety and energy saving. The EA washing and heating effectively avoids the problem of environmental pollution caused by harmful gases generated by heating and promotes the purification process and reuse of industrial waste salts.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2016
·Vol. 4
·期 3
·1600862
·
IF 3.365
Cunlong Yu,Cunming Yu,Liying Cui,Zhiyang Song,Xinyu Zhao,Ying Ma,Lei Jiang
Nowadays, oily wastewater and spilled oil have caused great threats on both ecosystem and human life. To address these severe problems, considerable efforts have been possessed on developing novel oil/water separation materials. The porous oil-absorbent materials, especially the porous polydimethylsiloxane (PDMS) with excellent properties of easy fabrication and inherent hydrophobicity, have attracted tremendous attentions from worldwide. The conventional methods using salt or sugar as sacrificial template and water as solvent have been widely adopted to fabricate the porous PDMS sponge. Due to the inherent hydrophobicity of PDMS, the solvent of water hardly penetrates into the inside of PDMS, which results in the difficult and incomplete remove of the hard template. In this contribution, the 3D interconnected porous PDMS sponge is facilely prepared by utilizing a modified technique with the citric acid monohydrate as hard template and ethanol as solvent. The proposed approach is capable of removing the hard template efficiently and thoroughly, which demonstrates promising utilizations in practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Botian Hao,Donghai Xu,Yu Wang,Yuanyuan Wang,Krzysztof Kapusta,Yang Guo
In this study, non-noble metal Ni, Cu, Co loading on activated carbon (AC) were applied to the hydrothermal liquefaction (HTL) process of municipal sludge with ethanol solvent to evaluate the effects on biocrude. Three AC-supported non-noble metal catalysts were prepared: Ni/AC, Ni-Co/AC and Ni-Cu/AC. Ni-Co/AC and Ni-Cu/AC catalysts increased the HHV of biocrudes, and significantly reduced the sulfur content in biocrudes from 4.3 wt% to 0.8 wt% and 0.7 wt% compared with non-catalytic HTL. Ethanol solvent significantly improved biocrude yields, and esters accounted for about 50% of the total biocrudes due to esterification reaction. The presence of Ni-Co/AC along with ethanol promoted the conversion of high boiling point compounds to low boiling point compounds.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Mei Dong,Wenjing Shi,Jian Chen,Danni Zhao,Mengmeng Yang,Wenxin Yang,Wei Deng,Wensheng Li,Weiping Luo
In this study, the solubilities of phthalic acid (PA) and o-toluic acid (o-TA) in methanol, ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, sec-butanol, and tert-butanol were measured by the laser dynamic method at atmospheric pressure (101.3 kPa) in the range of 292.25–353.35 K. The experimental results show that the solubilities of PA and o-TA in eight alcohols are positively correlated with temperature. In the four solvents methanol, ethanol, n-propanol, and n-butanol, the solubilities of PA and o-TA decrease with the increase of the number of carbon atoms in the main chain, and the order of solubility of PA and o-TA in butanol isomers from high to low is tert-butanol, sec-butanol, n-butanol, and iso-butanol. The solubility ratio of o-TA and PA in iso-butanol is the largest, indicating that iso-butanol could best separate the two. The experimental data were correlated by using the Apelblat model, the Buchowski–Ksiazczak λh model, and the modified no n-random two liquid activity coefficient model. The calculated solubilities were in good fit with the measured results. The Akaike information criterion was used to evaluate the selected model. The thermodynamic properties were calculated, and the main contributor of standard molar Gibbs energy of PA and o-TA in eight alcohols is enthalpy, about 54.66 to 68.34%.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 15
·3301-3308
·
IF 3.286
Ren Shu Huan,Liu Shi Gang,Ling Yu,Shi Yan,Li Nian Bing,Luo Hong Qun
We present a facile method for the preparation of red-emitting and water-soluble silver nanoclusters (Ag NCs) using dihydrolipoic acid and sodium borohydride as the template and reducing agent. Ethanol solvent is demonstrated to endow Ag NCs with dramatically enhanced fluorescence; therefore, the Ag NCs are synthesized in ethanol/water solution (e/w-Ag NCs) instead of aqueous solution. Specific trivalent chromium (Cr 3+ ) recognition capability of the e/w-Ag NCs can thus be obtained on the basis of its fluorescence quenching. The mechanisms for fluorescence enhancement and quenching of the e/w-Ag NCs triggered by ethanol and Cr 3+ , respectively, are investigated in detail. Next, a fluorescence method for detection of Cr 3+ is established and its analytical performance is evaluated: the detection limit for Cr 3+ is 0.71 μM and the linear range is from 2 to 40 μM. The fluorescent probe exhibits sufficient sensitivity and good selectivity toward Cr 3+ , illustrating that it has great promise for practical application in Cr 3+ detection.
研究领域:
分析化学
·
纳米材料科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Mai Han,Yujie Zhen,Fangyu Zhang,Anle Zhang,Jiajun Wei,Wei Wang,Zhiwei Zhang,Wenxue Lu,Tao Li,Qingsong Li
The development and research of biomass fuels have been paid more and more attention. The production of methacrylic acid is accompanied by a large amount of water and environmental pollution. Therefore, the separation of methacrylic acid from aqueous solution is of great significance for industrial production and environmental protection. The liquid–liquid equilibrium (LLE) for ternary systems of water + methacrylic acid + alcohol solvents at 303.2 K and 101.3 kPa was investigated. Thermodynamic models (NRTL and UNIQUAC) were used to correlate and regress the experimental data. The root-mean-square deviation (RMSD %) was used to evaluate the deviation between the experimental value and the calculated value, which were 1 and 1, respectively, indicating that the extractants selected in the experiment could well separate methacrylic acid from the aqueous solution, and 1-octanol exhibits better extraction performance. The correlation of LLE data is proven by MATLAB. In addition, the binary interactive parameters of the model regression are verified by MATLAB.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Xiangping Li,Jianguang Zhang,Bin Liu,Juping Liu,Chuanbin Wang,Guanyi Chen
Non-noble metal(s)-based mesoporous catalysts are one of the promising catalysts for aqueous phase hydrodeoxygenation of lignin-derived phenols to produce hydrocarbons. In this paper, Ni/Al-SBA-15 was prepared through incipient wetness impregnation method and the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was studied. The effect of incipient wetness impregnant on the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was investigated. The materials were characterized by XRD, N 2 -sorption, TEM, FTIR, Py-FTIR, XRF and ICP-MS. In comparison with the traditional incipient wetness impregnation using water as solvent, the activity of Ni/Al-SBA-15 was significantly improved by using ethanol as solvent during the process of incipient wetness impregnation. For Ni/Al-SBA-15, the quantity of total acid was decreased after loading nickel species which was mainly due to the decrease of Lewis acid sites. The strength of Lewis acid in Ni/Al-SBA-15 prepare with ethanol as impregant was enhanced. The yields of propyl cyclohexane and propylbenzene from aqueous phase hydrodeoxygeation of eugenol over Ni/Al-SBA-15-E were increased. The super catalytic behavior of Ni/Al-SBA-15-E was attributed to the synergistic effect between the stronger Lewis acid sites and the intact framework structure of Ni/Al-SBA-15-E.
研究领域:
催化化学
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可再生能源
·
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）