Frontiers in Energy Research
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2023
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IF 3.4
Liu Yong,Zhao Fajun,Niu Ruixia,Cao Sheng,Liu Lei,Song Yarui
This study examined an enhanced foam-flooding system incorporating nanoparticles and polymers under geological conditions of a reservoir of the Shu 16 block in the Yushulin oilfield. The system is mainly comprised of an anionic foaming agent (CQS-1) and a nonionic surfactant (FH-1). We screened 17 foams by evaluating their foaming volumes and foam half-lives using a Waring-blender and dynamic foam analysis methods, and nanoparticles were selected after examining each foam’s concentration, the ratio of the main agent to the auxiliary agent, and the dosage of the foam stabilizer. Then, we analyzed the selected system’s microstructure and rheological properties, including the adaptability of the reservoir to its temperature resistance, salt tolerance, and adsorption resistance. As a result, this study supports the field application of CO2 foam flooding.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Hongwei Ren,Yize Liu,Ruoyao Zhang,Tengda Zhao,Jing Han,Zhiyang Zheng,Erhong Duan
The sustainable development of carbon dioxide (CO 2 ) resource requires the realization of green and efficient capture for the fossil fuel CO 2 . However, the high operation costs and biological toxicity have hampered the application. Natural deep eutectic solvents (NADESs) are efficient and green CO 2 absorbent. In this manuscript, kinds of amino acid-based NADESs were prepared successfully to improve the absorption efficiency of CO 2 capture solvent. The chemical structure of NADESs was characterized, and the thermal stability was also measured. The CO 2 capture behavior of amino acid-based NADESs was investigated. With multi-reactive sites, unstable stage and more accessibility of alkyl structure on HBA (alkyl amino acids and aromatic amino acids, especial L -Ary), and less electronegativity on HBD (EG), L -Arg/EG NADESs had lower solvation effect ( β value, 1.286) and reduced viscosity (48.33 mpa.s at 60 ºC). It behaved better absorption capacity . The optimized conditions by single-factor analysis and Response surface methodology were L -Arg/EG at the mole ratio of 1:5, 30 °C and 200 mL/min, and the absorption could reach 0.81 molCO 2 /kgNADESs. Additionally, an insight into the reaction mechanism was investigated. It was found that hydrogen-bond structure played an important role in CO 2 capture. The broken of H-O···H-N formed by amino acids and ethylene glycol promoted the formation of new bonds of -(O=)C···NHR between L -Arg/EG and CO 2 , thus achieved higher CO 2 capture. The investigated proved that the green solvent amino acid-based NADESs could be efficient absorbents for CO 2 capture.
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Journal of Materials Chemistry A
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2023
·Vol. 11
·期 8
·4261-4271
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IF 11.9
Yuxin Xie,Chenghao Yao,Lei Li,Zhan Lin
The light-triggered CO2 catalytic reduction process of high efficiency is highly desirable but challenging. Herein, we present two viologen-based metal–organic frameworks (M-VOF, where M = Co and Ni) as ideal platforms for photocatalytic CO2 reduction. Co-VOF exhibits a high CO evolution rate of 458.66 μmol g−1 h−1 under light irradiation, while Ni-VOF provides a CO evolution rate of 52.33 μmol g−1 h−1 with superior durability. Experimental studies reveal that the viologen-based frameworks play an important role in the transfer and separation of the charge carriers in the catalytic system. This work provides not only a superior Co-VOF catalyst but also promotes in-depth insight into the structure–activity relationships toward the activation and photoreduction of CO2.
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Dehao Kong,Weirong Zhou,Jiayin Han,Yubing Gao,Yuan Gao,Liupeng Zhao,Peng Sun,Geyu Lu
Crystal facet engineering strategy is an effective way to regulate the exposed facets, which affect the ability of the surface to adsorb and react with gas molecules, ultimately enhancing the gas-sensing properties. In this work, Co 3 O 4 mesoporous nanosheets with dominant exposed {1 1 1} facets (Co 3 O 4 -60) or {1 1 2} facets (Co 3 O 4 -100) were synthesized by simply adjusting the condensation-reflux temperature. The sensing results toward toluene show that Co 3 O 4 -60 exhibited superior performance. According to the crystal structure analysis and work function calculations, the (1 1 1) facet composed of Co 2+ would adsorb more oxygen molecules, which have been proved by experimental characterization, facilitating the sensing efficiency. The results of X-ray photoelectron spectroscopy indicated that Co 3 O 4 -60 possesses a higher Co 2+ content and chemisorbed oxygen ratio (52.9%). Furthermore, Co 3 O 4 -60 has a high electrical conductivity and a minor apparent activation energy for toluene (38.75 kJ/mol). The gas sensor based on Co 3 O 4 -60 exhibited a response of 20.6 for 100 ppm toluene with rapid recovery and a detection limit of 1 ppm. Besides, other properties such as selectivity, repeatability, and humidity resistance were evaluated. This work evidences that crystal facet engineering is a practical approach to improving the gas-sensing properties of pure-phase Co 3 O 4 .
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APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Guodong Sun,Yanan Cao,Deqing Li,Mingzhen Hu,Xinhu Liang,Zhe Wang,Zengjian Cai,Fengyi Shen,Bozhen Chen,Kebin Zhou
Electrochemical reduction of CO 2 to multi-carbon products is very attractive yet particularly challenging due to the low efficiency of C-C coupling over currently used electrocatalysts. In this work, we report a dual-atom catalyst (Cu 2 /NC) capable of selectively promoting electro-reduction of CO 2 to C 2 H 4 . The Faradaic efficiency of CO 2 -to-C 2 H 4 over the Cu 2 /NC is up to ∼34.9% with a current density of 33.6 mA·cm −2 . By contrast, its Cu single-atom counterpart only generates CO without forming C 2 H 4 . The density functional theory (DFT) calculations reveal that the Cu-Cu sites largely promote the adsorption of *CO and reduce the energy barrier of C-C coupling between the adsorbed *CO relative to that of the single Cu sites, which accounts for the high C 2 H 4 selectivity of the Cu 2 /NC.
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Advanced Science
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2023
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IF 15.1
Bo Gao,Changqing Tian,Linfeng Guo,Jinchen Zhou,Zixian Wang,Chengfan Fu,Hongmei Ran,Wei Chen,Qiang Huang,Daofu Wu,Xiaosheng Tang,Zhongtao Luo
In order to deal with the global energy crisis and environmental problems, reducing carbon dioxide through artificial photosynthesis has become a hot topic. Lead halide perovskite is attracted people's attention because of its excellent photoelectric properties, but the toxicity and long-term instability prompt people to search for new photocatalysts. Herein, a series of <111> inorganic double perovskites Cs 4 Mn 1-x Cu x Sb 2 Cl 12 microcrystals (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) are synthesized and characterized. Among them, Cs 4 Mn 0.7 Cu 0.3 Sb 2 Cl 12 microcrystals have the best photocatalytic performance, and the yields of CO and CH 4 are 503.86 and 68.35 µmol g −1 , respectively, after 3 h irradiation, which are the highest among pure phase perovskites reported so far. In addition, in situ Fourier transform infrared (FT-IR) spectroscopy and electron spin resonance (ESR) spectroscopy are used to explore the mechanism of the photocatalytic reaction. The results highlight the potential of this class of materials for photocatalytic reduction reactions.
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高影响因子
ChemNanoMat
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2023
·Vol. 10
·期 3
·e202300479
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IF 3.8
Zijian Wang,Mengdie Li,Mingjiao Xiao,Yanze Wei,Ranbo Yu,Zumin Wang
Graphical Tiny NiP nanoparticles dispersed was used as an inexpensive, stable, and active cocatalysts on ultrathin Nb 2 O 5 nanosheets to replace the noble metal Pt. Owing to the extended light harvesting, enhanced carrier separation, and improved surface reaction, the NiP/Nb 2 O 5 exhibits even higher activity and selectivity towards CO 2 photocatalytic reduction. And the roles and function mechanisms of the cocatalyst were studied. Photocatalytic CO 2 reduction holds great promise to solve energy shortage and global warming. Nb 2 O 5 has demonstrated superiority in CO 2 activation and selectivity regulation, but suffers from poor light absorption ability and fast carrier recombination. To tackle these problems, we designed and synthesized ultrathin Nb 2 O 5 nanosheets which were decorated with tiny NiP nanoparticles as cocatalyst. In this way, light absorption range broadened, carrier migration distance reduced, charge transfer resistance decreased, and surface reaction kinetics promoted. Consequently, the as-prepared NiP/Nb 2 O 5 showed notably enhanced activity (148.7 μmol ⋅ g −1 ) and selectivity (82.1 %) towards CO, as well as remarkable stability. This work paves the way for cheap and earth abundant alternatives as cocatalysts and deepens the understanding of their functions in CO 2 photoreduction.
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CHEMICAL PAPERS
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2023
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IF 2.2
Liu Wenqiang,Li Jiangxin,Xie Yuheng,Wang Yajuan,Zhang Juan
Dimethyl carbonate (DMC) is widely used and nontoxic and can replace more dangerous materials such as dimethyl sulfate or methyl chloride. Spherical particle catalysts (PILs-XSS) were synthesized by suspension polymerization, which was characterized by SEM–EDS, FT-IR, TG, and BET-BJH. The characterization results showed that PILs-XSS had a specific core structure, a certain pore size (14.3 nm), and surface area size (71.5m 2 /g) and remained stable at 293.4 °C. The catalyst performance was evaluated by a one-pot synthesis of dimethyl carbonate. The process conditions were optimized in detail. The optimal reaction conditions were as follows: the dosage of PILs-XSS was 2.5 wt %, the CO 2 pressure was 1.5 MPa, the reaction temperature was 100 °C, the reaction time was 4 h, the molar ratio of methanol to propylene oxide (PO) was 3: 1, and the dosage of cocatalyst Na 2 CO 3 was 3 wt %. Under the optimum conditions, the conversion of PO was up to 98.8% and the yield of DMC reached 53.7%. In addition, the combined catalyst PILs-Na 2 CO 3 was easily recovered by filtration in the reaction system. After five times of repeated use, the activity and the shape of the catalyst were almost unchanged, which meant that the catalyst had amazing mechanical strength. This study found that the transesterification catalyst Na 2 CO 3 not only had good transesterification efficiency but also promoted the reaction of CO 2 . Graphical abstract
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Journal of Environmental Sciences
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2023
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IF 6.9
Xiaoyun Chen,Guohua Jing,Bihong Lv,Zuoming Zhou
The non -aqueous solid-liquid biphasic solvent of 2-amino-2-methyl-1-propanol (AMP)/piperazine (PZ)/dipropylene glycol dimethyl ether (DME) features a high CO 2 absorption loading, favorable phase separation behavior and high regeneration efficiency. Different with the liquid-liquid phase change solvent, the reaction kinetics of CO 2 capture into solid-liquid biphasic solvent was rarely studied. In the present work, the reaction kinetics of CO 2 absorption into AMP/PZ/DME solid-liquid biphasic solvent was investigated into the double stirred kettle reactor. The absorption reaction followed a pseudo-first-order kinetic model according to the zwitterion mechanism. The overall reaction rate constant ( k ov ) and the enhancement factor ( E ) of CO 2 absorption both increased with increasing temperature. The total mass transfer resistance of the absorbent decreased with increasing temperature and increased with increasing absorption loading, so the higher reaction temperature was conducive to the absorption, and the liquid phase mass transfer resistance was the main factor affecting the absorption rate.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yan-Fei Mu,Jin-Shuang Zhao,Li-Yuan Wu,Ke-Ying Tao,Zhao-Lei Liu,Fu-Quan Bai,Di-Chang Zhong,Min Zhang,Tong-Bu Lu
Strong photoresponse, efficient charge separation, and high surface activity are three important requirements for an ideal photocatalyst, while few photocatalysts can fully meet these requirements. Herein, we report such a photocatalyst based on lead-free halide perovskite hollow nanospheres (H-Cs 3 Sb 2 Br 9 ) by a facile antisolvent-assisted method. The hollow structure of H-Cs 3 Sb 2 Br 9 improves the light-harvesting performance; The formation of surface shallow trap states contributes to promoting the excited-carrier separation; The ligand-free termination surface of H-Cs 3 Sb 2 Br 9 facilitates the exposure of Br vacancies and active sites, thus strengthens the CO 2 adsorption and accelerates surface reactivity dynamics. As a result, with a dinuclear Co(II) complex as the co-catalyst, H-Cs 3 Sb 2 Br 9 exhibits a record-high photocatalytic activity for CO 2 reduction, with a CO yield of 15,010.4 ± 550.4 μmol g −1 after 8 h of illumination under simulated solar light (100 mW cm −2 ). This research presents a new way to develop cost-effective photocatalysts for CO 2 reduction.
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MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Debin Zeng,Longtao Wang,Ruian Du,Zhen Wu,Xiting Wang,Chunguang Kuai,Yuzheng Guo,Changlin Yu
CO 2 photoreduction under mild conditions remains challenging, attributing to sluggish kinetics of complex coupling process of multi-electrons-protons and inefficient electron-hole pairs utilization. Herein, with Zn 3 V 2 O 8 as a phase transformation material, we construct an effective Zn 2 V 2 O 7 /Zn 3 V 2 O 8 /ZnO (OVZn) Z-scheme system by partial decomposition of Zn 3 V 2 O 8 into Zn 2 V 2 O 7 and ZnO. Time-resolved fluorescence decay (TRFD) spectra investigation shows that the photogenerated electrons of Zn 2 V 2 O 7 and ZnO recombine with the holes of Zn 3 V 2 O 8 , retaining more reductive electron of Zn 3 V 2 O 8 for CO 2 reduction. Moreover, in-situ Fourier-transform infrared spectroscopy suggests that the heterostructure can lower the energy barrier of CO desorption by changing bridge-bonded CO to linear-bonded CO and optimizing the energy barrier of CO production. Moreover, Cu, Ag and Au loading on OVZn greatly enhance light harvesting and promote photoelectric conversion, producing much photogenerated electron-hole pairs for CO 2 reduction. OVZn and metal loaded OVZn have better photocatalytic performance, showing application superiority on CO 2 photoreduction.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Qian Yi,Chunan Zhao,Cunbin Lv,Guanghao Wan,Miaomiao Meng,Lanyi Sun
The enhancement of gas–liquid mass transfer in the CO 2 absorption process by Low Transition Temperature Mixtures (LTTMs) based nanofluids was investigated. The effects of loading and size of TiO 2 nanoparticles on the CO 2 absorption rate were studied experimentally. The absorption rate was found to be improved significantly after adding nanoparticles. The maximum enhancement factor of 1.35 was observed when using nanoparticles with a particle size of 10 nm and a concentration of 0.6 kg/m 3 . The maximum absorption enhancement factor and mass transfer coefficient were observed when the loading of nanoparticles increased, hence there was an optimal concentration of TiO 2 nanoparticles in the CO 2 absorption process. For the size of nanoparticles, the CO 2 absorption rate was higher when the diameter of nanoparticles decreased. Furthermore, a three-dimensional unsteady mathematical model of gas–liquid mass transfer, which was based on the mechanisms of grazing effect and hydrodynamic effect in the gas–liquid boundary layer, was developed to describe the CO 2 absorption enhancement. The model predictions were well consistent with the experimental results, with a maximum deviation of less than 5%, which proved the reliability of the model. Finally, Molecular dynamics simulations were conducted on the absorbent-CO 2 system. The results showed that the addition of TiO 2 nanoparticles led to a reduction in the simulation box size at the same simulation time, but it did not significantly alter the interaction between LTTMs and CO 2 . Therefore, it can be inferred that TiO 2 nanoparticles enhance CO 2 absorption capacity by modifying the mass transfer rate. Through the aforementioned study, this paper explores the experimental and mechanistic aspects of nanoparticle-enhanced absorption of CO2 in LTTMs systems. The research demonstrates the feasibility of nanoparticle-enhanced absorption of CO2 in LTTMs solvents, providing insights into studying nanoparticle-enhanced gas–liquid mass transfer and offering a new research approach for CO2 capture.
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