ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Guangxu Fu,Huimin Li,Qiuhong Bai,Cong Li,Yehua Shen,Hiroshi Uyama
The fabrication of dual-doped activated carbon with a hierarchical pore structure is an effective way for the preparation of the high performance carbon-based electric double layer capacitor. Herein, nitrogen and sulfur dual-doped activated carbon (NSC) with hierarchical pore structure was obtained by directly carbonizing/activating polymer-based blend monolith. The as-obtained NSC samples exhibit a high specific surface area (1570–2550 cm 2 g −1 ), a developed hierarchically pore structure, and have an appropriate nitrogen and sulfur content. Furthermore, originating from the synergistic effect by pore structure, heteroatom, and proper graphitized crystal structure, the optimized NSC-based electrode exhibits a high specific capacitance of 330.5 F g −1 at a current density of 0.5 A g −1 , superior rate capability of 66% at 20 A g −1 and acceptable cycling stability in the three-electrode system. Meanwhile, the assembled carbon-based symmetric capacitor exhibits an acceptable energy density and a remarkable power density of 11 kW kg −1 with 6 mol L −1 KOH as the aqueous electrolyte. These results demonstrate that the as-resulting NSC could be a competitive candidate for carbon-based electrode materials, and this work would be a valuable exploration that as a facile synthetic strategy to prepared dual-doped activated carbon for electric double layer capacitor.
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ENERGY & FUELS
·
2021
·
IF 3.605
Yuhao Zhang,Feng Chen,Liang Zhao,Jinsen Gao,Chunming Xu,Qingfei Meng,Xiangqi Liu
The extractive distillation process is gradually being used for the desulfurization of fluid catalytic cracking (FCC) naphtha because of its excellent octane number protection performance during desulfurization. The key to this process is the separation of sulfides. However, the composition of FCC naphtha is complicated and easily changes, which seriously affect the separation performance. The operating conditions need to be adjusted frequently with the change in the different properties of feedstocks, which cost time, manpower, and investment. In this study, we introduce a simulation method using the universal quasi-chemical functional group activity coefficient (UNIFAC) model to predict the process of desulfurization. In the simulation, the group binary parameters for the UNIFAC model seriously affect the reliability of the method. Therefore, the lacking parameters of the solvent and sulfides were first regressively calculated by the experimental results of the binary vapor–liquid equilibrium (VLE). All the values of (D–J) by the Herington integral method were under 10, which means that the parameters obtained in this work were well correlated to those of the VLE experiments. Based on this, the prediction simulation method was established and the maximum error of the compositions of the products between simulation and real-oil experiment was only 0.5 wt %. According to the simulation, 98% of sulfides could be extracted under the optimal conditions (113 °C at the extraction column, 178 °C at the solvent recycle column, etc.). The rule of the extraction of sulfides was thiophene sulfur > mercaptan sulfur > thioether sulfur, which is consistent with the VLE study results. The sulfur content of the raffinate oil was decreased to 9.3 mg/kg. It well met the latest gasoline standard and is appropriate for the prediction of the desulfurization of FCC naphtha by the extractive distillation process.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wenyan Shi,Xiaolong Han,Fang Bai,Chao Hua,Xingzhong Cao
The metal–organic framework MOF-505 particles were synthesized and incorporated into the polyethylene glycol (PEG) matrix to prepare mixed matrix membranes. A series of methods were used to characterize the structure and morphology of MOF-505 particles and membranes. The prepared MOF-505 had a well-developed pore structure, a large number of metal sites for selective adsorption of thiophene and good compatibility with polymer matrix. Accordingly, the desulfurization performance of the membrane was improved effectively. The effects of the content of MOF-505, operating temperature and feed sulfur content on membrane performance were investigated by pervaporation experiments. The membrane with 3 wt% MOF-505 showed the optimal desulfurization performance with a permeation flux of 2.66 kg/(m 2 ·h) and an enrichment sulfur factor of 8.15, which were increased by 158% and 25% versus pristine membrane, respectively.
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FUEL
·
2021
·
IF 6.609
Yuhao Zhang,Mengmeng Liu,Liang Zhao,Suxin Liu,Jinsen Gao,Chunming Xu,Mingzhi Ma,Qingfei Meng
Contradiction between the desulfurization and loss of octane number (ON) for fluid catalytic cracking (FCC) naphtha is the long-term problem of clean gasoline production. Moreover, ON loss is substantially aggravated during deep hydrodesulfurization because of the global limited supply of sulfur for gasoline. This paper introduced a novel process for ultra-clean gasoline production that solves the above problem by using a unique separation approach. The components were separated by the coupling of distillation and solvent extraction, which the separation efficiency depends on the relationship between solvent and feedstock components. However, the compositions of FCC naphtha are complicated and always changing due to different processing technologies. Therefore, changes in the material composition must be considered during production. In this study, ternary liquid–liquid equilibrium (LLE) was explored to investigate the interaction of olefin , sulfide, and sulfolane solvent. A universal quasi-chemical functional group activity coefficient (UNIFAC) group contribution model was selected to predict the product composition when the FCC naphtha was treated by this process. The lack and necessity of group interaction parameters for the prediction were obtained through the regressive calculation of LLE results. A simulation method was established by Aspen Plus, and the reliability was well illustrated. Finally, the high olefin content of FCC naphtha critical components was analyzed by this simulation method. The sulfur and olefin levels of the product were 9.0 mg/kg and 18.6 wt%, respectively. The operation conditions simulated using the proposed technique met the requirements for the latest commercial gasoline worldwide.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Liming Zhao,Jian Zhang,Pei Cao,Lixing Kang,Qian Gong,Jiaojiao Wang,Yongyi Zhang,Qingwen Li
The water transport in hydrogel has been proven to be critical for water evaporation, water treatment and moisture-wicking. However, confined with the regulation of pore structure , challenges remain in constructing fast water transport channels especially in harsh water environment. Herein, we demonstrate a simple strategy for fabrication of fast water transport carbon nanotube/poly (vinyl alcohol) (CNT/PVA) hydrogels via efficiently interior infiltration and decoration of CNT cellular structures with PVA. The CNT/PVA double-network structures favor the generation of hierarchical micro/nanochannels and strong capillary forces , leading to water transport throughout the hydrogel up to ~15.8 g g −1 s −1 , recorded highest among reported hydrogels. The as-formed elastic hybrid hydrogels present a reversible absorbing/shrinking behavior, an excellent capacity in water absorption (216 g g −1 ), and high adaptability in salty water, acid and alkaline solutions as well as boiling water. Moreover, a multifunctional sport headband has been designed based on fast water transport and conductive framework, which can perform fantabulous moisture-wicking and health monitor. This work proposes a new route for developing fast water transport hydrogels towards versatile flexible electronic devices and multifunctional sport management systems.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Peng Zhang,Yueyang Xu,Konglu Guo,Yan Yin,Jilong Wang,Yongping Zeng
Adsorption desulfurization represents an alternative technology for the effective removal of thiophenic compounds from fuels. Metal−organic frameworks have been the ideal candidates for the adsorptive desulfurization of fuel due to the high surface areas. Pristine UiO-66 is thought to be appropriate for the removal of small thiophenic compounds. This work developed a new type of hierarchical-pore (micro and mesopores) UiO-66 with a higher specific surface area and porosity for the removal of larger adsorbates using MOF-5 as the template. To enhance adsorption desulfurization performance, the Ag + -exchanged hierarchical-pore UiO-66 (HP-UiO-66-SO 3 Ag) with π-complexation was synthesized by the ion-exchange method. The HP-UiO-66-SO 3 Ag samples were characterized by FTIR, XRD, SEM, TEM, and N 2 adsorption–desorption isotherms. Compared with the original UiO-66, the HP-UiO-66-SO 3 Ag has a higher specific surface area, pore volume, and pore size. The static adsorption experiments showed that HP-UiO-66-SO 3 Ag had a high adsorption capacity for thiophene and benzothiophene . Moreover, the HP-UiO-66-SO 3 Ag sample still exhibits high adsorptive performance in the presence of toluene. The regeneration results show that about 90% of the initial adsorption capacity of HP-UiO-66-SO 3 Ag can be regenerated after four cycles.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Piaoyang Li,Danmei Rao,Yimei Wang,Xiaorong Hu
Porous polythiophene materials were successfully synthesized by external-crosslinker method and applied as sorbents in solid-phase extraction. A method for the determination of tetracycline antibiotics (tetracycline/ oxytetracycline/doxycycline) in fish and chicken manure was proposed by combining solid phase extraction-ultraviolet visible spectrophotometer (SPE-UV) and solid phase extraction-high performance liquid chromatography (SPE-HPLC). The effects of material dosage, extraction time, washing time, eluent type and dosage, and the reusability of polythiophene sorbent on extraction rate were investigated. With the use of SPE-HPLC method, satisfied linearity for three tetracyclines antibiotics was obtained in the range of 0.004–1 mg/L. The detection limits (LODs) were ranged from 0.0012 to 0.0027 mg/L and the relative standard deviations (RSDs) were 3.5–7.3% (n = 5). The recoveries in actual fish samples and chicken manure samples were 91.1–114.1% and 69.5–93.2%, respectively. No tetracycline antibiotics were detected in fish samples and no doxycycline was detected in chicken manure samples. However, oxytetracycline and tetracycline were detected in two chicken manure samples with the contents of 5.12, 6.58 mg/kg and 6.08, 7.72 mg/kg, respectively. This method was simple, sensitive and suitable for the determination of tetracyclines in practical samples.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jiyang Xie,Haoqing Jiang,Shuailong Guo
Palladium adsorbent is used in the ultradeep desulfurization process of benzene to prepare refined benzene, which is an important commercial chemical raw material in the petrochemical industry. However, with the increasing cost of palladium adsorbent, the wide application of palladium adsorbent in the benzene refining process is greatly limited. Here, we rationally designed PtNi/MgAlO adsorbent using the 3D nanomicroflower structure of MgAlO as the support and PtNi bimetallic nanoparticles as the active component. Various characterization techniques including BET, XRD, SEM, TEM, TPR, XPS, and N2-TPD were used to investigate the correlation between the adsorption performance and the microstructure of the adsorbent. The results show that the PtNi/MgAlO adsorbent exhibited an excellent adsorption sulfur capacity of 1.74 mg/g. Also, nearly 100% thiophene elimination was observed for 382 h, better than the commercial Pd/Al2O3 adsorbent. It shows great potential application in the ultradeep desulfurization of benzene.
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ACS Catalysis
·
2021
·
IF 13.084
Muhong Li,Shanyong Chen,Qike Jiang,Qingliang Chen,Xuan Wang,Yong Yan,Jian Liu,Changchang Lv,Weiping Ding,Xuefeng Guo
The production of functionalized anilines by chemoselective hydrogenation of nitroarenes occupies an important position in the chemical industries. Recently, cobalt and nitrogen codoped carbon (Co–N–C) catalysts have been reported to show outstanding catalytic performance in this process, whereas the nature of their active sites is still at the center of intense debate. In this paper, based on the well-controlled experiments on four types of typical Co–N–C materials derived from different methodologies, several unusual generalities in the hydrogenation of nitroarenes are clearly revealed, including protic-solvent dependence, antipoisoning, acid resistance, and reversible deactivation. Further investigations indicate that the single-atom species Co–Nx are the main active sites of the Co–N–C catalysts in this chemoselective hydrogenation process. The present work sheds light on the mechanism study on the metal–N–C catalysts and further contributes to the rational design of the high-performance single-atom catalysts.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Huixiang Wang,Mingxing Tang,Fenglei Shi,Ruimin Ding,Liancheng Wang,Jianbo Wu,Xuekuan Li,Zhong Liu,Baoliang Lv
The oxidative desulfurization (ODS) of fuel oils is of great significance for environmental protection, and the development of efficient ODS heterogeneous catalysts is highly desired. Herein, we have designed and synthesized a novel material of amorphous Cr2WO6-modified WO3 (a-Cr2WO6/WO3) nanowires (3–6 nm) with a large specific surface area of 289.5 m2·g–1 and rich Lewis acid sites. The formation of such a unique nanowire is attributed to the adsorption of Cr3+ cations on non-(001) planes of WO3. In the ODS process, the a-Cr2WO6/WO3 nanowires can efficiently oxidize benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) to their corresponding sulfones in a quasi-microemulsion reaction system and possess the highest activity (Ea = 55.4 kJ/mol) for DBT: 99.0% of 15,000 ppm DBT with 2600 ppm S can be removed (70 °C, H2O2 as the oxidant). The improvement in ODS activity from most of WO3 catalysts is owing to the sufficient active sites and enhanced adsorption of DBT on the basis of structural features of a-Cr2WO6/WO3 nanowires. Combined with free radical capture experiments, a possible ODS mechanism of W(O2) peroxotungstate route based on surface −OH groups is reasonably proposed. Moreover, the a-Cr2WO6/WO3 nanowires have good stability and can be synthesized on a large scale, suggesting its potential applications as an efficient heterogeneous catalyst.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
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IF 2.369
Luxia Yin,Bo Zhang,Jinbing Zhou,Jiacheng Xu,Wanghui Gong,Jianguang Gao,Wensheng Ning,Zekai Zhang,Wei Hua Yu
Ag2O/SiO2–TiO2-n aerogel composites with different molar ratios of Si/Ti, prepared by a sol–gel method followed by the ambient pressure drying technique, were used for the adsorptive removal of thiophenic compounds from model fuels, along with Ag2O/SiO2-50. The physicochemical properties of aerogel composites were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) spectroscopy, Brunauer–Emmett–Teller (BET) method, Fourier transform infrared (FT-IR) spectroscopy, NH3 temperature-programmed desorption (TPD), and pyridine (Py) FT-IR spectroscopy. The results indicated that doping Ti into Ag2O/SiO2-50 led to a slight decrease in the specific surface area, an obvious increase in the actual content of Ag, and the appearance of weak Lewis acid centers on the surface. The data for equilibrium adsorption of thiophene over Ag2O/SiO2-50 and Ag2O/SiO2–TiO2-50 were well fitted to the Langmuir and Freundlich isotherm equations. The kinetic experimental data of Ag2O/SiO2–TiO2-50 was well fitted by a pseudo-second-order model. For two adsorbents, negative values of ΔG indicated that the adsorption processes were spontaneous. The adsorption process on Ag2O/SiO2–TiO2-50 was more favorable at higher temperatures, which was contrary to that on Ag2O/SiO2-50. The incorporation of Ti into Ag2O/SiO2-50 can improve the adsorptive desulfurization performance owing to the increase in the actual content of Ag species (π-complexation centers), and thiophenic compounds can be adsorbed via Lewis acid–base interaction and S–Ti binding besides π-complexation. Among Ag2O/SiO2–TiO2-n, Ag2O/SiO2–TiO2-50 performed the best.
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AICHE JOURNAL
·
2021
·Vol. 67
·期 5
·e17153
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IF 3.993
Yuhao Zhang,Liang Zhao,Feng Chen,Yongtao Wang,Jinsen Gao,Liyuan Cao,Hui Wang,Chunming Xu
The fluid catalytic cracking (FCC) naphtha critical component-oriented separation process is an efficient method to produce ultra-low-sulfur (<10 μg/g) gasoline with minimal loss of octane number (<1 RON). However, the product quality is highly dependent on the structure of the components of FCC naphtha. Aromatics and thiophene sulfides without a methyl side chain favor the separation of olefin. The major impulse of olefin separation is the solvent-induced dipole of aromatics or thiophene sulfides, leading to a “Plane-to-Plane” combination between the solvent and aromatics or thiophene sulfides, accompanied by a steric hindrance due to their side chains. This condition resulted in 2–3 times greater θ of benzene and thiophene compared with that of toluene and 3-methylthiophene. In addition, an improved non-random two-liquid model was proposed based on the above results, and a simulation method for FCC naphtha solvent extraction process was established. The calculation results accorded well with industry data.
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