CHIRALITY
·
2020
·Vol. 32
·期 9
·1178-1185
·
IF 2.171
Bo Tang,Chenyu Sun,Wei Wang,Lina Geng,Liquan Sun,Aiqin Luo
Herein, we describe a new chiral amorphous metal–organic polyhedra used as the stationary phase for high-resolution gas chromatography (GC). The chiral stationary phase was coated onto a capillary column via a dynamic coating process and investigated for a variety of compounds. The experimental results showed that the chiral stationary phase exhibits good selectivity for linear alkanes, linear alcohols, polycyclic aromatic hydrocarbons, isomers, and chiral compounds. In addition, the column has the advantages of high column efficiency and short analysis time. The present work indicated that amorphous metal–organic polyhedra have great potential for application as a new type of stationary phase for GC.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiancheng Liu,Yu Yang,Yunying Xie,Fuchao Jia,Huijuan Niu,Xiaomei Wang,Tong Zhou,Guangchao Yin,Bo Liu
Isopropanol possessed enormous significance across various application fields from industry to healthcare. Detecting isopropanol was essential in leak detection and diagnosis of disease because it can assist diagnose of lung cancer and guarantee safety in industrial environment via discerning potential leaks. In this research, a simple hydrothermal method and subsequent sacrificial template strategy were used to fabricate in-situ growth SnO 2 nanotube arrays (SnO 2 NTs). Next, SnO 2 NTs was decorated with boron nitride quantum dots (BNQDs) in order to enhance the gas-sensing performances of the SnO 2 NTs. The BN/12-SnO 2 NTs exhibited the highest response (s = R a /R g ) of up to 7.9 for 100ppm IPA, which was 2.7 times that of the 12-SnO 2 NTs. The response and recovery times of the SnO 2 NTs-based sensor were around 10 s and 8 s, respectively. The optimal working temperature of BN-SnO 2 NTs was 260 ℃, which was significantly lower than that of the pure SnO 2 NTs sensor (320 ℃). The improved sensing performances were largely attributed to the sensitization effects of BNQDs and the one-dimensional hollow structure of SnO 2 NTs, which brought about the generation of more oxygen-active species on the surface of BN-SnO 2 NTs and a significant decrease in the activation energy of the redox reaction .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangfei He,Chao Peng,Lijuan Yue,Xiuli Han,Han Chen,Chunli Guo,Lichun Xu,Jianli Shao,Meiqing Guo
Due to its high reversible capacity, Fe 7 S 8 has emerged as a promising anode material for sodium-ion batteries (SIBs). However, its application is limited by slow reaction kinetics and significant volume expansion during the charging and discharging process, resulting in poor rate capacity and reduced cycling stability. To address these issues, a novel high-temperature gas-expansion method is proposed to uniformly incorporate Fe 7 S 8 nanoparticles into N and S co-doped porous carbon (Fe 7 S 8 @NSC). It effectively reduces the volume expansion of Fe 7 S 8 and improves its electron/ion conductivity. As a result, when used as an anode material in SIBs, Fe 7 S 8 @NSC demonstrates excellent rate performance, delivering a capacity of 500.0 mAh/g at a current density of 5 A/g. Additionally, it exhibits remarkable stability, maintaining 99.83 % of its capacity after 600 cycles at the same high current density.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mengxiang Fang,Ying Xie,Yan Shao,Xiaoming Xu,Yang Xia,Man Mou,Ximing Hu,Tao Wang,Zihao Liu
The steel industry generates 7–9 % of the world’s anthropogenic carbon emissions. Carbon capture, utilization, and storage (CCUS) technologies for low carbon emissions from the steel industry have attracted research attention. Chemical absorption is the most mature and widely used carbon capture method, and reducing the energy consumption of this technology is currently a research hotspot. This work focused on the development of amine blends suitable for carbon capture in a top gas recycling-oxygen blast furnace (TGR-OBF) for low-carbon steelmaking and further reduction of carbon emissions. The effects of piperazine (PZ) and its derivatives on methyldiethanolamine (MDEA) activation were explored. PZ and 2-(piperazin-1-yl)ethanamine (AEP) most significantly activated MDEA. The best absorption and regeneration performance was achieved with aqueous amine solutions at the MDEA:PZ and MDEA:AEP ratios of 5:3 and 1:1, respectively. Blast furnace gas is rich in CO, and we verified that CO does not significantly affect the overall performance of the aqueous amine solution. The maximum absorption rate of the developed MAA absorbent was similar to that of 30 wt% monoethanolamine (MEA), and at 20 % and 35 % CO 2 , the cyclic capacities were 1.57 and 1.47 times greater than that of 30 wt% MEA, while the maximum regeneration rates were 2.13 and 1.92 times greater than those of 30 wt% MEA, respectively. A bench-scale CO 2 capture experiment performed at a flow rate of 4 Nm 3 /h verified the scale-up application potential of the absorbent. The regeneration energy of MAA under the optimal operating conditions was 2.86 GJ/ton CO 2 , which was 28.5 % lower than that of 30 wt% MEA. Moreover, MAA displayed a lower latent heat and lower reaction heat. The developed MAA absorbent has great adaptability and low regeneration energy and is expected to be applied in the steel industry to effectively reduce blast furnace carbon emissions.
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Metals
·
2020
·Vol. 10
·期 3
·356
·
IF 2.117
Yongjie Liu,Yue Wang,Zhixiong You,Xuewei Lv
The steel micro-alloyed with ferrovanadium nitride has extremely superior properties that make it widely utilized in structural components, construction and aircraft. The conventional methods for synthesizing ferrovanadium nitride include nitridation of pure ferrovanadium alloy or carbothermal nitridation of metallic oxides, using nitrogen or ammonia gas as nitrogen sources. In this study, ferrovanadium nitride (FeV45N) was prepared by direct reduction and nitridation of the corresponding metal oxides with ammonia as the reductant and nitrogen source. This method avoids the introduction of other impurity elements, except the negligible trace elements accompanied with the raw materials. The thermodynamics of the reduction and nitridation process were initially analyzed. During the subsequent ammonia reduction process, the FeV45N powders were successfully obtained at 1273 K for 6 h. The obtained powders were pressed into cylindrical briquettes by hot pressing (HP) at 1473 K for 1 h in vacuum. In the investigation, the X-ray diffraction and morphological analysis of the products was also carried out, and the reaction mechanisms were discussed in detail. The nitrogen content of the final product can reach 11.85 wt. %, and the residual oxygen content can be reduced to 0.25 wt. %. By sintering, the density of the alloy can reach 5.92 g/cm3.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Lijia Zhao,Shupeng Sun,Su Zhang,Xiaogan Li
Using uniform carbon nanospheres as sacrificial templates, gold nanoparticle-modified ZnO@ In 2 O 3 hollow nanospheres with controlled dimensions and porous architectures were successfully synthesized through water bath, hydrothermal and chemical reduction methods. Gas sensing evaluation revealed that the Au-decorated ZnO@ In 2 O 3 hollow nanostructures exhibited a dramatically amplified response up to 14.8 when exposed to 10 ppm formaldehyde analyte at room temperature. Furthermore, multifaceted performance benefits of Au-decorated ZnO@ In 2 O 3 over single-phase ZnO, Au-ZnO, ZnO@ In 2 O 3 heterojunction-based composites were observed, including excellent selectivity towards formaldehyde even in complex gas mixtures; tremendous sensitivity enhancement stemming from synergies between efficient gas diffusion through hollow heterojunction nanospheres and accelerated surface reactions at catalytically-active Au sites; and rapid, fully-reversible response/recovery time of 32 s and 42 s, respectively. In-depth investigations were conducted into the fundamental sensing mechanisms enabling formaldehyde detection using AC impedance spectroscopy, in situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), and density functional theory (DFT) computational modeling analyses.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Lei Wang,Deren Fang,Yisen Wang,Hui Tian,Jie Liu,Wanzhong Ren
For fluid catalytic cracking naphtha, there exists a complex co-existing gas–liquid-solid three-phase system in the catalyst bed under deep hydrodesulfurization (HDS) conditions representative of industrial practice. The system is extremely crucial and could influence and even determine the finished HDS reaction result. The paper reports that owing to the diffusion at the gas/liquid interface of the above system, thiophene rather than slow-reacting benzothiophene and its alkylated derivatives remains in the final product, which is against with common-sense knowledge about the relative reactivity of sulfur compounds. Two designed experiments which investigate impacts of solvents and sulfur-containing compounds under different temperatures further corroborate the above conclusion. Meanwhile, they reveal that elimination of the diffusion through making gas/liquid two phases into one gas or liquid phase effectively improves the efficiency of desulfurization even under the same reaction conditions. It could be concluded that for the deep HDS reaction, diffusion at the gas/liquid interface is the rate-determining step of whole reaction, which is also proved by the resulting data under conditions (production of Euro-5 gasoline).
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FUEL
·
2019
·
IF 5.128
Zhen-Feng Sun,Shuai Jia,Qing Yuan,Chang-Yu Sun,Guang-Jin Chen
As a new kind of clean and high-energy resource, natural gas hydrate possesses promising prospects in exploitation and utilization. The characteristic of gas production in clay-rich sediments need to be further clarified for developing hydrates more safely and efficiently. To study the dissociation behaviors of methane hydrates in clayey sediments, a novel pressure retention system was applied to create both confined and unconfined environments using a one-dimensional visual hydrate simulator. Two types of methane hydrate deposits were simulated, of which were characterized by excess gas and excess water, respectively. Direct depressurization results showed that in confined environment, the increase of clay content in sediments will result in the decrease of gas phase permeability and gas production rate, but have negligible effect on the final gas recovery ratio. In unconfined environment, the infiltration of overlying seawater will result in the migration of fine-grained particles and extremely low gas recovery ratio. Moreover, the build-up of vertical pressure gradient was observed due to the occurrence of sediment compaction during depressurization process in clayey sediments. It is of significance to improve the effective permeability of the reservior and suppress water seepage for exploiting hydrate safely and efficiently.
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ENERGY & FUELS
·
2022
·
IF 4.654
Changhong Yu,Cheng Yue,Baojiang Sun,Xin Yang,Jiakai Ji,Zilong Meng,Litao Chen
Hydrate can easily form and cause plugging in offshore oil and gas pipelines. As the managing strategy moves from full avoidance to dynamic control, antiagglomerants (AAs) could be an economical and efficient option for hydrate management. Searching for new efficient hydrate AAs is always needed. In this work, the antiagglomerating performances of 57 commercial chemicals, including cationic surfactants, zwitterionic surfactants, nonionic surfactants, and polymers, to methane hydrate in an oil–gas–water system were evaluated by using a rocking-cell apparatus. The slider-moving trajectories were recorded during hydrate formation. The performances of AAs were evaluated based on the slider-moving profiles at various hydrate fractions. It was found that cocamidopropyl dimethylamine, a nonionic surfactant that is labeled as an A class AA, could fully avoid hydrate plugging when the hydrate fraction was under 18.76%. The slider-moving trajectory in the full range of the cell indicated that the hydrate was well-dispersed in the liquid phase. Besides, 23 chemicals mainly from cationic and zwitterionic surfactants, which are labeled as B class AAs, could partially avoid hydrate plugging at various hydrate fractions (10.96–19.92%). The slider could move in a partial range of the cell, indicating that the hydrate may agglomerate and accumulate at the end of the cell. The rest of the chemicals were labeled as class C AAs, with which the slider was fully stuck. The working mechanism is discussed for an insightful understanding on the antiagglomerating performances of the screened AAs. Chemicals with a combined presence of an amide group and an amine group exhibit great potential for hydrate antiagglomeration, while the hydrogen-bonding ability of the hydrophilic amine headgroup may be adversely affected by the incorporation of anions.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 7
·9733-9747
·
IF 4.672
Yingwei Xiong,Jinglan Wang,Min Jin,Xiaohong Wang
Summary Fe 2 O 3 is recognized as a promising oxygen carrier, but the susceptibility to sintering over the redox cycles limits its application. Although depositing Fe 2 O 3 on CeO 2 can simultaneously improve the activity and durability, the formation of CeFeO 3 will decrease the oxygen capacity and thus the efficiency of chemical looping water-gas shift reaction. Doping foreign elements can effectively mitigate the reaction between Fe 2 O 3 and CeO 2 and improve redox reactivity. This work employs Gd 3+ and Sm 3+ as doping elements and investigates the doping effect on hydrogen generation of Fe 2 O 3 /CeO 2 in water-gas shift with chemical looping. The characterizations demonstrate that both Gd and Sm are incorporated into the lattice of CeO 2 and increase the oxygen defect concentration, which boosts the redox reactivities. In addition, the interaction between the dopants and CeO 2 promotes the reduction depth by suppressing the solid reaction between Fe 2 O 3 and CeO 2 and improves the reoxidation reaction between reduced oxygen carriers with steam. As a result, Fe 2 O 3 /Ce 0.8 Sm 0.1 Gd 0.1 O 1.9 shows a high hydrogen yield (8.73 mmol.g −1 ) and hydrogen production rate (582.2 μmol.g −1 .min −1 ), which is 1.67 times higher than that of Fe 2 O 3 /CeO 2 . The performance remains stable over 40 cycles. The introduction of foreign cations may provide an effective method and significantly impact the oxygen carrier design.
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AICHE JOURNAL
·
2019
·Vol. 66
·期 2
·e16805
·
IF 3.463
Yanyan Liu,Jun Yue,Chao Xu,Shuainan Zhao,Chaoqun Yao,Guangwen Chen
Gas–liquid–liquid three-phase slug flow was generated in a glass microreactor with rectangular microchannel, where aqueous slugs were distinguished by relative positions to air bubbles and organic droplets. Oxygen from bubbles reacted with resazurin in slugs, leading to prominent color changes, which was used to quantify mass transfer performance. The development of slug length indicated a film flow through the corner between bubbles and the channel wall, where the aqueous phase was saturated with oxygen transferred from bubble body. This film flow results in the highest equivalent oxygen concentration within the slug led by a bubble and followed by a droplet. The three-phase slug flow subregime with alternate bubble and droplet was found to benefit the overall mass transfer performance most. These results provide insights into a precise manipulation of gas–liquid–liquid slug flow in microreactors and the relevant mass transfer behavior thereof.
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WOOD SCIENCE AND TECHNOLOGY
·
2013
·Vol. 48
·期 1
·195-206
·
IF 1.884
Wang Ting,Si Hongyan,Li Bin
Poplar wood flour, a low-cost and abundantly available material, was modified by grafting β - cyclodextrin in the presence of citric acid, aiming to expand the application of wood flour. The product was characterized by Fourier transform infrared spectroscopy and the technique of the phenolphthalein probe. By the technique of inverse gas chromatography and the method of Hamieh, the values of surface free energy and nonpolar part of the free energy were obtained. The results demonstrate that the dispersive component of the surface free energy of the products will increase with temperature increases, and the product presents a Lewis basic character with K
b / K
a = 3.67. Based on the structure of the product, the basicity comes from two parts. One is the rich electronic environment of the β - CD inner cavity, and the other is the formation of ester bonds through crosslinking between β - CD and wood flour by CA.
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危险品化学品经营许可证（带存储）