Energy Science & Engineering
·
2017
·Vol. 5
·期 4
·208-216
·
IF 2.172
Yuan Zhao,Haizhou Lin,Shurong Wang
A novel green reaction system of CO 2 –water–isopropanol has been developed for the production of furfural (FF) from xylose. Initially, a simple CO 2 –water system was investigated, and the results showed that the formation of FF from xylose was greatly enhanced. CO 2 at high pressure could increase the acidity of the reaction system, and thus the FF yield was improved. By raising the reaction temperature, the conversion of xylose was remarkably accelerated in the CO 2 –water–isopropanol system, leading to an acceptable conversion rate (94.41%) and FF yield (55.81%). Addition of an appropriate amount of NaCl further increased the yield to 69.20%. Other carbohydrates (arabinose and xylan) were also tested in the same reaction system and modest results were obtained.
研究领域:
生物化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Xi-yun YANG,Hai-qiang HUANG,Sheng-hai YANG
Anodic dissolution behavior of zirconium in Bu n 4 NBr-contaning isopropanol solution was investigated using cyclic voltammetry, linear sweep voltammetry and chronoamperometry, complemented with a scanning electron microscope (SEM). The voltammograms did not exhibit active dissolution until the breakdown of passive layer induced by aggressive bromide anions. SEM images confirmed the existence of pits on zirconium surface. The depth and breadth of pits were intensified with increasing potential. The pitting potential shifted negatively as either temperature or Bu n 4 NBr concentration was increased, while it increased with increasing scan rate. The corrosion current density increased with increasing temperature. The apparent activation energy of anodic dissolution of zirconium was 21.88 kJ/mol. The chronoamperometry revealed that increasing Bu n 4 NBr concentration shortened the incubation time for passivity breakdown and accelerated the pit nucleation and growth. The experimental results were helpful to obtain the optimum conditions for electrosynthesis of zirconium isopropoxide.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Wenjing An,Weiping Yang,Liqing Shi,Kejiang Qian,Huichao Suo,Peipei Ma,Tingzhao Xin,Jinhao Liu,Shuangxi Liu,Lan-Lan Lou,Kai Yu
Catalytic conversion of levulinic acid (LA) to γ-valerolactone (GVL) is one of the key reactions of biomass utilization, but the relatively high reaction temperature and H2 pressure always introduce safety and energy consumption issues. In this work, a photocatalytic transfer hydrogenation method was applied to achieve the hydroconversion reaction from LA to GVL under green and mild conditions using non-noble metal Bi2S3 materials as the catalyst. Up to 74.8% GVL yield and 76.3% selectivity can be achieved after 36 h of irradiation using the spherical Bi2S3 as the catalyst and isopropanol as the hydrogen source, which is significantly higher than any reported results on non-noble metal photocatalysts. The structural characterization and density functional theory calculation results indicated that the appropriate band position and lower adsorption energy toward LA rendered the spherical Bi2S3 catalyst highly reactive. Based on the results of electron paramagnetic resonance and density functional theory calculations, a reasonable photocatalytic transfer hydrogenation reaction pathway of LA to GVL was proposed. Bi2S3-photocatalyzed dehydrogenation of isopropanol generates H radicals, which react with LA adsorbed on the surface of Bi2S3 to form GVL through a hydrogenation-esterification process. The presence of Bi2S3 greatly promotes the adsorption of LA and reduces the energy barrier for LA hydrogenation.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Hongxu Tao,Haiqian Lian,Jingxian Hua,Shengui Ju,Yichang Pan
The MOF membrane has shown great promise for the gases or organic solvent mixtures separation. However, the implementation of MOF membranes remains challenged by defect formation during membrane fabrication. Herein, we reveal that the activation solvent plays a critical role in governing the degree of defect and separation performance in secondary-growth-derived ZIF-8 membranes. The isopropanol activation process exerts excellent membrane structure protection through a synergistic dual mechanism to limit the generation of ZIF-8 membrane defects during drying: (a) The isopropanol inhibits the ZIF-8 seed layer recrystallization and maintains its porous architecture to mitigate interfacial stress during drying through its elastic deformation. (b) The low surface tension of isopropanol minimizes the capillary force during solvent removal to reduce the risk of structural damage. While methanol activation and n-propanol activation have no such structure control. The optimized isopropanol-activated membrane achieves a C 3 H 6 /C 3 H 8 selectivity of 141 to show a 4.8-fold and a 4.4-fold compared to n-propanol- and methanol-activated membranes at room temperature and 1 bar. This study highlights low-surface-tension as an effective strategy for defect suppression in MOF membranes, advancing their potential for industrial hydrocarbon separations.
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 COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Huaizhi Liu,Liao Xu,Weixu Liu,Bo Zhou,Yinyan Zhu,Lihua Zhu,Xiaoqing Jiang
Here, we report a facile salt-assisted direct liquid-phase exfoliation method for mass production of MoS 2 nanosheets . We choose organic solvent isopropanol (IPA) as exfoliation media and potassium ferrocyanide, potassium sodium tartrate, or sodium tartrate as salt, the assistant. The selected salts show universal and efficient assistant effect for the exfoliation of MoS 2 in IPA. Especially, potassium ferrocyanide (K 4 Fe(CN) 6 ) can enhance the exfoliation efficiency up to 73 times and a dispersion of MoS 2 nanosheets with concentration as high as 0.240 mg mL −1 can be easily obtained in IPA-K 4 Fe(CN) 6 system. Transmission electron microscopy, atomic force microscopy (AFM), and Raman spectroscopy show that bulk MoS 2 has been successfully exfoliated into mono- to few-layer MoS 2 nanosheets . AFM analysis indicates that nearly 60% flakes are monolayer in MoS 2 dispersion.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Chong Yang,Zhijing Cai,Hong Chen,Yepeng Xiao,Hui Wang,Yiqiang Deng,Lihua Cheng
In the reported study, experimental liquid–liquid equilibrium (LLE) data for extracting isopropanol from cyclohexane utilizing 1,4-butanediol, 1,2-propanediol, dimethyl sulfoxide, and N,N-dimethylformamide as solvents were obtained at 303.2 K and atmospheric pressure. The separation factors derived from experimentally measured LLE data were computed to determine the extracting capability of the different solvents, and Othmer–Tobias, Hand, and Bachman equations were used to estimate the reliability and consistency of the LLE data. In addition, the nonrandom two-liquid (NRTL) thermodynamic model in Aspen Plus software was used to regress the LLE data, providing optimized binary interaction parameters. The regression results agreed well with the experimentally determined LLE values, indicating that the NRTL method was suitable to correlate the LLE data for the four ternary systems.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yaqi Qu,Mengying He,Hualiang An,Xinqiang Zhao,Yanji Wang
Selective hydrogenation of dimethyl toluene-2,4-dicarbamate (TDC) to methyl cyclohexyl-2,4-dicarbamate (HTDC) is an essential intermediate step in the new green route for synthesizing methylcyclohexyl-2,4-diisocyanate (HTDI). Herein, we investigated the synthesis of HTDC from TDC by a solvent-free, mild and safe catalytic transfer hydrogenation (CTH) process using isopropanol as H-donor. Firstly, a bimetallic catalyst In 2 O 3 @RhPt with a high metal dispersion was prepared by one-pot method. The characterization results demonstrated that Rh and Pt atoms formed alloy structure and their interaction led to an electron-rich Pt and an electron-deficient Rh. What’s more, Pt could also stabilize the surface of In 2 O 3 . Then the Rh/Pt ratio was optimized and In 2 O 3 @Rh 49 Pt 51 catalyst was found to show the best catalytic performance: about 99% of TDC conversion and 100% of HTDC selectivity at 80 ℃ and ambient pressure. It was proved by the designed experiments that isopropanol dehydrogenation was the dominant step and the active hydrogen species existed in the form of radicals in the CTH process of TDC to HTDC. Additionally, the synergistic effect in the RhPt alloy boosted the catalytic performance. Finally, the CTH reaction pathway and mechanism was elucidated based on the experimental and DFT calculation results.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Tao Xie,Jing-Pei Cao,Chen Zhu,Xiao-Yan Zhao,Ming Zhao,Yun-Peng Zhao,Xian-Yong Wei
Selectively cleaving the C O bonds in lignin to produce aromatic products are challenging problems. Currently, catalytic hydrogenolysis of C O bonds in lignin requires harsh conditions. Herein, selectively cleaving C O bond of benzyl phenyl ether (BPE) was studied over Pd/AC, Ru/AC and Ni/AC. Among these catalysts, Pd/AC efficiently cleaved C O bond in BPE under super mild conditions (25 °C, 2 h and 0.1 MPa H 2 ). The products were toluene and phenol without hydrogenation of the aromatic ring . The main competitive step of hydrogenolysis and hydrogenation is sensitive to reaction temperature over Pd catalyst. A mild temperature is preferred for hydrogenolysis, since the H species nearby the oxygen atom are more strongly adsorbed than nearby the benzene rings . With the different H-donor solvents, the highest conversion of BPE was obtained in isopropanol. Based on the experiments, the reactions occurred via cleavage of the C aliphatic -O bond in BPE and the synergetic effects between the H from absorbed H 2 on the surface of the Pd and the intermediates radicals of benzyl and phenoxy should be the key points to such an optimum result.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2018
·
IF 3.485
Baoguo Ma,Ting Zhang,Hongbo Tan,Xiaohai Liu,Junpeng Mei,Huahui Qi,Wenbin Jiang,Fubing Zou
This paper aims to investigate the effect of triisopropanolamine (TIPA) on compressive strength and hydration of cement-fly ash paste. The samples with various dosages of TIPA were prepared with 30% fly ash (FA) and 70% cement (water/binder ratio by weight = 0.38), and cured under the standard condition. The compressive strength, pore structure, hydration process, and hydration products were investigated. The results show that TIPA can obviously increase the compressive strength of cement-FA system at the age of 7 d and 60 d, and the reasons are involved in pore structure and hydration of cement-FA system. Pore structure was characterized with mercury intrusion porosimetry, and the results show that TIPA can reduce total porosity but increase the amount of pore with size more than 50 nm, implying the air-entraining effect with negative effect on compressive strength. The result suggests that TIPA and defoaming agent should be used together to minimize the negative effect in real concrete. Furthermore, analysis of hydration products shows that TIPA can accelerate the hydration of both cement and FA, and this can also be illustrated from solid-state nuclear magnetic resonance. It is noticed that TIPA can hasten the conversion of AFt to AFm, which can be indicated from hydration heat. Additionally, the acceleration of pozzolanic reaction of FA is because TIPA can accelerate the dissolution of aluminate, silicate, and ferric into liquid paste which was demonstrated from morphology characterization and the change of ions in pore solution. Such results would be expected to provide experience for the use of alkanolamine in promoting the performance of cement-based materials.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·
IF 2.322
Bingfeng Chen,Fengbo Li,Zhijun Huang,Guoqing Yuan
Furfural is directly converted to levulinate esters (isopropyl levulinate and furan-2-ylmethyl-levulinate) as potential biofuel feedstocks , through a combined catalytic strategy. Nb 2 O 5 -ZrO 2 mixed oxide microspheres are used as bifunctional catalysts for hydrogen-transfer hydrogenation and acid-catalyzed alcoholysis in isopropanol. Bifunctional catalysts improve sustainability of furfural conversion through process intensification. Hydrogen transfer hydrogenation from isopropanol avoids dangerous hydrogen gas , and abates process and environmental costs. Isopropyl levulinate and furan-2-ylmethyl-levulinate are the main products that can be applied as blending components in biodiesel or hydrocarbon fuels.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Shuai Kong,Liuhuimei Cheng,Junying Yan,Huiqing Liu,Ruirui Li,Baoying Wang,Yaoming Wang,Tongwen Xu
Metal alkoxides are widely applied in organic synthesis because of their solubility and volatility. However, conventional synthetic methods suffer from safety risks, harsh conditions, and low efficiency. This study reported the first evidence of isopropanol dissociation in a bipolar membrane and developed a green electrosynthesis route for lithium isopropoxide by taking advantage of isopropanol dissociation in bipolar membranes. We find that the threshold dissociation voltage of isopropanol was 53.4 V, which is significantly higher than that of water and C 1 /C 2 alcohols because of its low dielectric constant. To overcome high solution resistance, various electrolytes have been screened, with tetraethylammonium chloride resulting in an 88 % reduction in stack resistance. Under the optimized current of 6 mA·cm −2 with the BP-A configuration, lithium isopropoxide was synthesized with an energy consumption of 213 kWh·kg −1 and a current efficiency of 67 %. The product was characterized via FTIR and solid-state 7 L i NMR, confirming the successful formation of lithium isopropoxide. The technoeconomic analysis demonstrated that the bipolar membrane electrodialysis (BMED) process offers a cost-effective and energy-efficient alternative to traditional methods, with a production cost of $51.35/kg, which is significantly lower than that of the traditional synthesis route. This study expands the application of BMED in C 3 alcohols and offers theoretical and technical foundations for scalable and green production of metal alkoxides via alcohol dissociation.
研究领域:
有机合成
·
电化学
·
绿色化学
·
膜技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Longjun Guo,Wei Liu,Chunqing Wang
Nanoscale Ag-decorated CuO/SnO2 heterojunctions with coralloid hollow porous structure (ACSO HPs) were successfully synthesized though a hydrothermal route with electroless Ag plating followed by the calcination and acid-washing. Detailed microstructural characterizations confirmed that the hollow porous structure comprised CuO/SnO2 and Ag/SnO2 nanoheterojunctions, and the SnO2 surface was decorated primarily with nano-Ag, which was the outer layer of the structure. The ACSO HPs sensor displayed a higher response to isopropanol compared to toluene, acetone, benzene, ethanol, and methanol than other samples. For 100 ppm isopropanol, the ACSO sensor exhibited a faster response time (6 s) and a higher recovery time (34 s) than undecorated Ag samples. The improved sensing performance of ACSO samples was ascribed to the synergistic effect of the CuO/SnO2 nanoheterojunctions with the dramatic sensitization of the decorated nano-Ag, as well as the HPs.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）