Greenhouse Gases-Science and Technology
·
2024
·
IF 2.7
Yu Bin Wang,Jie Rui Yu,Xiao Xian Zhang,Hao Chen,Han Bang Ruan,Guo Hua Yang
Ammonia carbon capture is characterized by low corrosion, resistance to oxidation and degradation, and low energy consumption for regeneration. However, it also presents challenges such as a slow absorption rate and notable ammonia escape. Current ammonia decarbonization research primarily focuses on the flue gas from power plants, which differs in composition from ship exhaust gas. To address this, we constructed a small carbon absorption test bench and used a mixture of CO 2 and N 2 as the ship exhaust gas. Ammonia solution and alcohol served as absorbents and additives, respectively, to explore the effects of the additive hydroxyl number, the concentrations of the additive and ammonia solution, and the reaction temperature on carbon loading, absorption rate, and ammonia escape. Results indicated that n-propanol was most effective in inhibiting ammonia escape, and a low concentration of ammonia solution was more suitable for absorbing CO 2 . Specifically, when the concentration of ammonia was 4% and the concentration of n-propanol was 0.2 mol/L, the cumulative ammonia escape was reduced by 34% compared to the scenario without additives. Additionally, the carbon loading and average absorption rate reached 0.49 mol CO 2 /mol NH 3 and 2.33 × 10 −3 mol·kg −1 ·min −1 , respectively, representing increases of 34.2 and 60.7%. However, as the reaction temperature increased, the effectiveness of n-propanol in enhancing ammonia absorption diminished. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.
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
Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Zifei Yan,Grace Dai Zhen Lee,Jian Deng,Guangsheng Luo
The synthesis of terminal epoxides, which are vital components in pharmaceuticals and resins, often involves dehydrochlorination of β-chlorohydrins. Although intrinsic kinetics indicate that the dehydrochlorination reaction in the presence of sodium hydroxide could be very rapid, the practical implementation could always be hindered by long reaction time and low conversion rate. Extended contact between the product and the alkaline solution can lead to hydrolysis of the epoxy group, thus necessitating the process intensification to realize higher production efficiency and selectivity. Here, by characterizing thermodynamic equilibrium data and in-situ recording of the reaction that proceeded in a constant interphase reactor, the heterogeneous dehydrochlorination is demonstrated to occur primarily in the organic phase, and the overall reaction rate depends on the equilibrium concentration of sodium alkoxides. This finding, which is fundamentally different from the traditional view that chlorohydrin is first dissolved in the aqueous phase and then reacts with NaOH, leads us to use inert alcohols to assist in the extraction of NaOH. Based on this method, the reaction time can be reduced over 80 % both in batch and continuous reactors. Besides, the method is demonstrated to be effective in the dehydrochlorination of five different long-chain β-chlorohydrins.
研究领域:
化学工程
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
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IF 2.6
Feihu Li,Mengyuan Li,Jin Guo,Xiwei Hu,Jiaming Zhu,Qunsheng Li,Hongkang Zhao
N-Propanol (NPA) and n-propyl acetate (NPAC) can form an azeotrope under normal pressure, so their separation cannot be carried out by conventional distillation. Therefore, 1-butyl-3-methylimidazole acetate ([BMIM][OAC]) and ethylene glycol (EG) were selected as entrainers for extractive distillation of the two substances. Isobaric vapor–liquid equilibrium data were obtained by experiments of NPA + NPAC, NPA + NPAC + [BMIM][OAC], and NPA + NPAC + EG at normal pressure; the experimental results showed that the separation effect of [BMIM][OAC] is significantly better than that of EG. Finally, the data were fitted and correlated with the NRTL model. The ARD (average relative deviation) of NPA + NPAC, NPA + NPAC + [BMIM][OAC], and NPA + NPAC + EG is less than 5%, indicating that the NRTL model has good applicability to the vapor–liquid system.
研究领域:
化学工程
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Fan Yang,Qinqin Zhang,Hua Xin,Tianzhao Wu,Zhigang Zhang
Separating the mixture of the target product n-propyl acetate (NPAC) and the unreacted reactant n-propanol (NPA) is necessary during the production of NPAC. NPA and NPAC cannot be separated by simple distillation because the two could form an azeotrope under atmospheric pressure. Liquid–liquid extraction is an energy-saving and environment-friendly method for separating azeotropic mixtures. Ionic liquids (ILs) are promising alternatives to conventional extractants for separating azeotropes due to the advantages of designability and negligible vapor pressure. In this study, the liquid–liquid equilibrium (LLE) data for the ternary systems of NPAC + NPA + 1-butyl-3-methylimidazolium dihydrogen phosphate ([BMIM][H2PO4]) or 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) or 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) were determined at 303.15 K and 101.3 kPa. The accuracy of the experimental LLE data was checked by the Bachman, Hand, and Othmer–Tobias equations. The selectivity and partition coefficient were calculated to evaluate the extraction capability of the selected extractants. The experimental LLE data were correlated with the nonrandom two-liquid model, and the binary interaction parameters were regressed. Finally, the separation mechanism of the three ILs was explored through σ-profile analysis.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Huijuan Li,Shunguo Qiu,Li Chen,Taotao Fan,Xiong Peng,Zongcheng Yan
A deep eutectic solvent (DES)-based aqueous biphasic system (ABS) denotes a clean and highly biocompatible separation and purification technology, but the explanations of the phase formation mechanism and phase behavior of a DES-based ABS are incomplete. To improve the study of the formation mechanism of a DES-based ABS, a new ABS composed of n-propanol (NPA) and DES with betaine as the hydrogen-bond acceptor (HBA) and polyol as the hydrogen-bond donor (HBD) was formed. The phase formation mechanism of this new ABS and the stability of the DES in the ABS were studied. Betaine and three polyols are hydrophilic (log KOW < 0), whereas NPA is relatively hydrophobic (log KOW > 0). Two phases were formed, because the two components of DES were incompatible with the NPA. The molar ratio of the HBA and HBD in the two phases differed, but in the bottom phase of this ABS, the stoichiometric ratio of HBA and HBD was the same as their initial ratio. Under certain conditions, this novel ABS was considered a ternary-like system. The combination of a series of factors, such as HBD hydrophilicity, molar volume, molecular weight, and initial molar ratio of HBA and HBD, affected the final stoichiometric ratio of HBA and HBD in the top phase.
研究领域:
化学工程
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Chang Long,Kaiwei Wan,Yu Chen,Lei Li,Yuheng Jiang,Caoyu Yang,Qianbao Wu,Guoling Wu,Peng Xu,Jiong Li,Xinghua Shi,Zhiyong Tang,Chunhua Cui
As fuel and an important chemical feedstock, n-propanol is highly desired in electrochemical CO2/CO reduction on Cu catalysts. However, the precise regulation of the Cu localized structure is still challenging and poorly understood, thus hindering the selective n-propanol electrosynthesis. Herein, by decorating Au nanoparticles (NPs) on CuO nanosheets (NSs), we present a counterintuitive transformation of CuO into undercoordinated Cu sites locally around Au NPs during CO reduction. In situ spectroscopic techniques reveal the Au-steered formation of abundant undercoordinated Cu sites during the removal of oxygen on CuO. First-principles accuracy molecular dynamic simulation demonstrates that the localized Cu atoms around Au tend to rearrange into disordered layer rather than a Cu (111) close-packed plane observed on bare CuO NSs. These Au-steered undercoordinated Cu sites facilitate CO binding, enabling selective electroreduction of CO into n-propanol with a high Faradaic efficiency of 48% in a flow cell. This work provides new insight into the regulation of the oxide-derived catalysts reconstruction with a secondary metal component.
研究领域:
材料科学
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电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Mingxia Yang,Senqing Fan,Jiaojiao Chen,Yu Chen,Chuang Li,Jiaxin Meng,Haijie Qing,Yangchao Liu,Zeyi Xiao
An electrocatalytic membrane structured reactor (EMSR) fabricated by loading MnO 2 catalyst in Ti membrane pores for oxidation of n-propanol coupled with hydrogen evolution. During the process of n-propanol oxidation coupled with hydrogen evolution by MnO 2 @Ti EMSR via flow-through mode, the conversion rate of n-propanol was increased by 44%, the selectivity of propionic acid was increased by 33%, and the Faraday efficiency was increased by 59%, compared with those of MnO 2 /Ti membrane with MnO 2 immobilized on the membrane surface. Enhanced contact and mass transfer are two contributors for the catalytic performance improvement by MnO 2 @Ti EMSR via flow-through mode. Besides, the cell voltage during n-propanol oxidation coupled with hydrogen production is decreased by 305 mV with energy consumption reduced by 0.73 kWh Nm H2 -3 , compared with those of hydrogen evolution by water splitting with oxygen evolution reaction. The achievements of this work provide a promising strategy for coproduction of propionic acid and hydrogen.
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
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Shangjun Lin,Wentao Liu,Xuehe Hou,Zhenyun Peng,Zhencheng Chen,Fangrong Hu
As an organic substance, n -propanol gas has been paid attention to in environmental monitoring and exhalation of lung cancer patient. In this paper a rapid detection method for n -propanol gas is developed based on molecularly imprinted polymers (MIP) and terahertz (THz) metasurface sensors. We first prepared a MIP suitable for detecting the n -propanol gas. And then the n -propanol MIP was modified to the THz metasurface sensor for detecting the n -propanol gas. Since the MIP adsorbed with n -propanol changes the dielectric environment of the sensor, the resonance frequency of the sensor also change. So we based on the n -propanol concentration was analyzed according to the change in resonance frequency. The experimental results showed that the sensor can effectively detect the n -propanol concentration in the range of 50–500 ppm (parts per million). In addition, we also verified the specificity and repeatability of the sensor. This work provides a new idea and method for the sensitive and specific detection of n -propanol gas.
研究领域:
环境科学
·
医学诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 71
·57482-57489
·
IF 3.84
Qianchun Zhang,Feifei Meng,Lin Zha,Xingyi Wang,Guoyi Zhang
In this paper, we developed a cataluminescence-based sensor using SrCO3/graphene for sensitive and selective detection of n-propanol. The composite was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and gas adsorption. The sensor was coupled with a miniature vaporizing device to detect n-propanol in liquid samples. The experimental results revealed that the SrCO3/graphene sensor exhibited a sensitivity for n-propanol 5.8 times higher than that of pure SrCO3, indicating that the sensitivity of the SrCO3/graphene sensor was increased by adding graphene to SrCO3. The linear range of the sensor was 0.2 to 32 mg L−1 (r = 0.9987) with a limit of detection of 0.08 mg L−1. The sensor showed a rapid response of 2 s and a recovery time of 20 s, respectively. The sensor was used to analyze samples spiked with known concentrations of n-propanol. The concentrations of n-propanol in all samples were well quantified with satisfactory recoveries, indicating that the SrCO3/graphene sensor is a promising candidate for fast, sensitive, selective detection of n-propanol. We also discuss the possible mechanism based on the reaction products.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Weiyi Bu,Yan Zhang,Qixuan Qin,Yuliang Li,Zhijie Zhou,Changhua Hu,Xiaohong Chuai,Tianshuang Wang,Peng Sun,Geyu Lu
In our work, CdS nanocrystals were simply prepared via coprecipitation method and subsequent annealing process (300, 400, 500 °C). X-ray powder diffraction (XRD) and the transmission electron microscope (TEM) etc. methods were used to analyze structure morphologies of the samples. The unannealed CdS nanocrystal is cubic, its phase evolution depends on annealing temperature. At 300 °C, its cubic phase was remained. Annealing at 400 °C makes small amount of hexagonal phase produced and cubic/hexagonal homojunctions were formed. Thorough phase transition to hexagonal phase was completed at 500 °C. The sensing properties based on the synthesized CdS nanocrystals with different phase structures were measured. The CdS-400 based sensor had the highest sensitivity to n-propanol, which was 41 at the optimum temperature of 225 °C. The response time was less than 1 s and the best selectivity was also obtained. The greatly enhanced gas sensing performance may be attributed to cubic/hexagonal CdS homojunction.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liyong Du,Guoli Yang,Yi Liu
The research on the synthesis of three-dimensional (3D) porous structures has garnered significant interest among scholars. In this study, ZnSnO 3 /ZnO heterostructures are prepared using butterfly wings as biotemplates, resulting in the formation of a hierarchical porous network structure characterized by regular ridges and pillars. Subsequently, we construct a resistive gas sensor utilizing these ZnSnO 3 /ZnO heterostructures, which exhibits not only a relatively high responses (14.7) but also rapid response and recovery speed (1 s/6 s) when exposed to 100 ppm n-propanol at 220 °C. Furthermore, the sensor demonstrates a low limit of detection (LOD) of 432 ppb, strong repeatability, good long-term stability (80 days), and excellent anti-humidity properties (S 84 % /S 33 % ≈ 0.84). The enhanced gas sensing performance is primarily attributed to the formation of ZnSnO 3 /ZnO n-n heterostructures, the increase in oxygen vacancies, and the presence of ordered open porous structures. Consequently, ZnSnO 3 /ZnO heterostructures show significant potential for the detection of n-propanol gas in practical applications. This work also presents a promising strategy for the development of homogeneous/heterogeneous materials with a 3D open porous structure, which can be applied in surface-related fields.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
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