INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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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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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Dexin Sun,Yulong Zhao,Yanjing Cao,Mengqi Liu,Yuxiang Zhang,Liang Zhao,Yuhao Zhang,Jinsen Gao,Chunming Xu,Tianzhen Hao,Jialing Chen,Dewei Ji
In order to efficiently obtain the optimum hybrid extraction solvents for mercaptan removal from liquefied petroleum gas, the method of combining molecular dynamics simulation preselection and extraction experiment was carried out. The results show that the selected hybrid solvents all exhibit a better extraction desulfurization performance, and of which, the isopropanol hybrid (IPA) solvent exhibited the best removal efficiency. With the aid of density functional theory calculations, the interaction mechanism was studied and the results show that the weak hydrogen bond plays a crucial role in the n-propylmercaptan (PM) removal process. The strength of the hydrogen bond is attributed to the structure of solvents, such as functional groups as the acceptor of the hydrogen bond and the species, number, and length of side chains attached to functional groups. Based on the above mentioned analysis, IPA exhibits a stronger hydrogen bond interaction with PM, which significantly enhances the extraction capacity and prolongs the service life of the solvent.
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高影响因子
ENERGY
·
2019
·
IF 5.537
Lin Long,Weixing Zhou,Yunfeng Qiu,Zhenzhong Lan
Endothermic hydrocarbon fuel of active thermal protection has great potential in cooling system. The bottlenecks for the practical application are the unsatisfied heat sink and severe coking issue. Here, NiO nanoparticle/nanosheet hybrid thin layers were successfully wrapped on the commercial HZSM-5 (denoted as ZSM-5@Ni M ), and showing significant modulation ability for the acidity properties of HZSM-5 to boost supercritical cracking of n-decane. The as-prepared catalysts make the NiO and HZSM-5 show synergistic effect which dramatically lowers the overall acidity of composite, thus changes the cracking path of n-decane, and results in effective anti-coking properties. ZSM-5@Ni M decelerated many additional free radicals and generated more gases products by monomolecular beta cleavage reaction. Gases products also show positively correlating with the heat sink. The catalysts improve the heat sink of n-decane from 3.77 MJ/kg at 728 °C to 4.59 MJ/kg at 780 °C. Present work demonstrates that the introduction of nanostructured metal oxides into HZSM-5 will synergistically adjust the acidity of composite, leading to the manipulation of catalytic cracking path and extent, gas products, heat sink, coking behavior of supercritical n-decane, finally providing deep insights for the design and fabrication of catalysts for hydrocarbon fuel cracking.
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高影响因子
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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高影响因子
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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高影响因子
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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高影响因子
PHYSICA SCRIPTA
·
2022
·Vol. 98
·期 1
·015012
·
IF 3.081
Juncheng Zhou,Xinyue Huang,Wenlin Feng
A Michelson interferometric carbon monoxide (CO) fiber-optic sensor based on Co/Ni-MOF-74 is proposed and fabricated. The bimetallic-ion-coordination MOFs material Co/Ni-MOF-74 was prepared by solvothermal method. Through XRD and XPS characterizations, the results show that Co/Ni-MOF-74 and Ni-MOF-74 have the same crystal structure. Co/Ni-MOF-74 has a good adsorption effect on CO, and it is integrated into the optical fiber sensing structure for CO detection. In the CO concentration range of 0–35 ppm, the sensitivity and linearity are 0.022 35 dB/ppm and 0.999 36, respectively. The detection limit of the sensor is about 1.990 46 ppm. The presented fiber-optic sensor has excellent selectivity, resistance to temperature interference and good time stability, and it is expected to be applied to the detection of trace CO.
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高影响因子
FUEL
·
2022
·
IF 8.035
Yi-Ming Gu,Ya-Hui Wang,Sheng-Sheng Zhao,Hong-Jun Fan,Xiao-Wei Liu,Zhiping Lai,Shu-Dong Wang
Carbon capture from flue gases is one of the crucial routines for reducing current CO 2 emissions and mitigating the greenhouse effect. Metal-organic frameworks (MOFs) have received a lot of interest as efficient solid adsorbents for CO 2 /N 2 separation in flue gas treatment. However, many MOF materials are susceptible to the presence of water vapor, which has a significant impact on their adsorption efficacy and moisture stability. Here in this work, we reported two pillar-layered Zn-MOFs with N -donors, i.e., Zn 2 (TRZ) 2 (Fuma) and Zn 2 (TRZ) 2 (BDC), which demonstrated high CO 2 uptakes (3.92 and 1.52 mmol/g) and CO 2 /N 2 (132 and 20.5) adsorption selectivities at 298 K and 101 kPa, among the best comprehensive results reported by far. After seven days of exposure to a 100 % RH environment, it was found that, the Zn-N pillar contributes to the robust structure of MOFs . Furthermore, in-depth theoretical calculations indicated the guest-framework interactions, and dynamic sorption tests confirmed high working capacities (2.78 and 1.14 mmol/g), sufficient water stability and remarkable cycling performance of the studied MOFs under humid ambient conditions. We believe this work provides a routine to prepare robust and promising candidates to address the challenge in carbon capture under humid conditions.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jinmei He,Chen Yang,Xin Yang,Lulu Liu,Jiehui Li,Qian Liu,Lei Peng,Xiangrong Liu,Mengnan Qu
Slow gas consumption process has been considered as one of the main limiting factors to enhance the activity of oxygen reduction reaction (ORR). The superwettable materials can overcome the limitation of underliquid gas transport in electrocatalysis, however, most of the preparation process are complex and high cost. Herein, an electrocatalyst for ORR is synthesized by loading ZIF-67 on carbon black, then the hydrophobicity is bestowed on the catalyst and controlled by adjusting the amount of 1H,1H,2H,2H-perfluorodecyltriethoxysilane, aimed to preparing the carbon-based electrocatalyst with hydrophobic surface (Cal-CoZIF-XE2B/PFDS). Continuous and abundant cavitations on the catalyst surface ensure the rapid diffusion of oxygen to the three phase contact area of the reaction system. Compared with the unmodified catalyst, the hydrophobic catalyst has larger diffusion-limited current density (from 4.4 mA/cm 2 of the original catalyst to 5.2 mA/cm 2 of the modified catalyst) and higher half-wave potential (from 0.81 V of the original catalyst to 0.83 V of the modified catalyst). Furthermore, the as-prepared electrocatalysts which obtained with low cost and simple method, presenting durability and stability against alkaline and acidic electrolyte solutions and providing a general and reliable strategy for the study of ORR catalyst.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Peng Wu,Jiaqiang Sun,Mohamed Abbas,Pengfei Wang,Yilong Chen,Jiangang Chen
Hydrophobic SiO 2 -supported Fe-Ni bimetallic catalysts were synthesized by facile hydrothermal method, followed by grind-mixing process. The as-synthesized nanoparticles were appointed as robust catalysts in the methanation process to improve the calorific value of the natural gas. Notably, the functionalization of SiO 2 surface with a hydrophobic layer was performed using a fluorinated alkyl group, as a critical step to prohibit the water-gas shift (WGS) reaction and consequently produce low amount of CO 2 content during the methanation process. The obtained catalytic results demonstrated that Fe 1.5 Ni 1.5 catalyst exhibited an excellent CO conversion of 95.2% at 320 °C with a natural gas calorific value of 56.4 MJ Nm −3 , which is much higher than the previously reported results when traditional Ni-based catalysts used. Moreover, the modified hydrophobic catalyst exhibited a lower CO 2 selectivity compared with unmodified one. This study provides a new and promising insight for the design and development of high-calorie SNG product.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xingyu Xiao,Liangliang Liu,Junhao Ma,Yuan Ren,Xiaowei Cheng,Yongheng Zhu,Dongyuan Zhao,Ahmed A. Elzatahry,Abdulaziz Alghamdi,Yonghui Deng
Owing to their distinct chemical and physical properties, mesoporous metal oxide semiconductors have shown great application potential in catalysis, electrochemistry, energy conversion, and energy storage. In this study, mesoporous crystalline SnO2 materials have been synthesized through an evaporation-induced co-assembly (EICA) method using poly(ethylene oxide)-b-polystyrene diblock copolymers as the template, tin chlorides as the tin sources, and tetrahydrofuran as the solvent. By controlling conditions of the co-assembly process and employing a carbon-supported thermal treatment strategy, highly ordered mesoporous SnO2 materials with a hexagonal mesostructure (space group P63/mmc) and crystalline pore walls can be obtained. The mesoporous SnO2 is employed for fabricating gas sensor nanodevices which exhibit an excellent sensing performance toward H2S with high sensitivity (170, 50 ppm) and superior stability, owing to its high surface area (98 m2/g), well-connected mesopores of ca. 18.0 nm, and high density of active sites in the crystalline pore walls. The chemical mechanism study reveals that both SO2 and SnS2 are generated during the gas sensing process on the SnO2-based sensors.
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高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Qingping Xin,Kaiqiang Xie,Qingqing Liang,Xu Li,Yinan Zeng,Yuhang Zhao,Lei Zhang,Shaofei Wang,Hong Li,Yuzhong Zhang
In membrane contactors, maintaining a high SO 2 absorption flux and an excellent wetting resistance are crucial for hazardous gas removal. In this study, we adopted an electrospinning strategy to fabricate highly robust superhydrophobic dual-layer Elec-PVDF/SiO 2 composite membrane contactors used for flue gas desulfurization. The composite membrane contactor consisted of a durable and ultrathin three-dimensional (3D) superhydrophobic surface and a porous supporting layer, where the formulation was optimized by regulating the PVDF concentration, solvent ratio and SiO 2 particles content in electrospinning solution. The scanning electronic microscopy (SEM), EDS-mapping, water contact angle (WCA) and surface roughness of as-prepared Elec-PVDF/SiO 2 composite membrane contactors were conducted to explore the physical and chemical structure. The SiO 2 nanoparticles were uniformly loaded in Elec-PVDF/SiO 2 composite membrane contactor, and constructed micro-nano dual-coarse lotus-leaf-like morphology, which noticeably elevated surface roughness ( R a ). The SiO 2 nanoparticles also functioned as hydrophobic modifiers, which boosted the WAC up to 155°. The SO 2 absorption fluxes and SO 2 removal efficiencies were investigated. In particular, the membrane contactor doped with 20 wt% SiO 2 nanoparticles significantly elevated the stability of desulfurization performance. Besides, the membrane mass transfer coefficient ( K m ) and corresponding membrane mass transfer resistance ( H / K m ) were explored.
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