Gas Science and Engineering
·
2024
·
IF 0
Fuhua Wang,Zhihao Zhang,Weidong Zhang,Haitao Zhu,Luyi Wang,Li Liao
In the development of unconsolidated sandstone gas reservoirs, water and sand production pose challenges, reducing gas deliverability and causing reservoir damage. This paper presents a novel ternary water control and gas recovery technology using hydrophobic modification. The technology focuses on reversing capillary forces at the far-well edge of the reservoir to prevent water intrusion and creating a hydrophobic gravel layer around the wellbore to enhance water resistance. Additionally, the slotted liner cavities are treated to improve erosion resistance and maintain smooth gas flow , effectively controlling water and sand. The approach aims to minimize water and particle migration, thereby improving gas phase permeability. Researchers assessed the technology's effectiveness using a sand-gravel-slotted liner model and examined how sand wettability , gravel size, and liner slot width affect water resistance. Results show that the technology significantly reduces water phase permeability and gas sand content, increases water breakthrough pressure, and maintains the original permeability of the gas reservoir. When the formation sand contact angle θ sand > 156°, the particle size ratio D 50 / d 50 = 6.5, and the slit width is 0.30 mm, the water-resisting ability is the best. The research results can provide corresponding theoretical construction parameters for the field engineering of high-water cut-off loose sandstone gas reservoirs.
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AICHE JOURNAL
·
2024
·Vol. 70
·期 7
·e18443
·
IF 3.5
Kang Wang,Yao Jiang,Mingming Xu,Dongdong Zheng,Shaojun Jia,Peng Cui
Separation of CH 4 from natural gas is an essential but extremely challenging process in the petrochemical industry. Here, we tailored a MOF-based adsorbent with partitioned aliphatic pore spaces through the simultaneous incorporation of the aliphatic sites and the symmetrically matched partition agent. The resulting adsorbent demonstrates exceptional adsorption capacity for C 3 H 8 and C 2 H 6 compared to CH 4 , along with remarkably competitive adsorption selectivities for C 3 H 8 /CH 4 and C 2 H 6 /CH 4 . Breakthrough experiments further support the excellent dynamic separation efficiency of the adsorbent for the purification of CH 4 from natural gas. Moreover, detailed density functional theory calculations and molecular simulations elucidate the synergistic interactions between the aliphatic sites and the partitioned pore spaces within the adsorbent, which promote the stronger binding affinities for C 3 H 8 and C 2 H 6 over CH 4 .
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ziyi Shui,Fenglian Zhang,Hongling Yang,Mengfei Zhao,Zeyu Zhao,Ganggang Li,Zheng Wei,Guoxia Jiang,Zhongshen Zhang,Zhengping Hao
Exploring electronic metal-support interaction (EMSI) in heterogeneous catalysis is significant for developing efficient supported metal catalysts. Herein, single-atom Pt 1 /CeO 2 catalysts possessing diverse local structures and coordination environments are convincingly fabricated via ALD technique for the water-gas shift reaction (WGSR). The PtCe-2 catalyst obtained after two ALD cycles is primarily composed of Pt 1 coordinated to five oxygen atoms (Pt 5c ), while the PtCe-6 catalyst is dominated by Pt 3c configuration. The PtCe-2 catalyst exhibits an H 2 production rate ≈2.4 times higher than that of PtCe-6 at 250 °C. The combined experimental and theoretical studies demonstrate that the atomic location-induced strong EMSI weakens the adsorption strength of CO on Pt 5c , subsequently lowering the energy barrier for the crucial intermediate step of CO conversion. This study elucidates the effect of EMSI in the WGSR, and provides new insights for the rational design of efficient single-atom catalysts.
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CHIRALITY
·
2024
·Vol. 36
·期 8
·e23699
·
IF 2.8
Caiyu Zhang,Yang Liu,Lan He,Wei Li
Pidotimod is a chiral drug that possesses two chiral centers, resulting in three isomeric impurities (analytes, A). This study employs electrospray ionization ion trap mass spectrometry (ESI-MS) through collision-induced dissociation (CID) to investigate the chiral recognition of pidotimod and its three isomers to eliminate chromatographic separation. Three approaches were explored: (1) Protonated molecules in CID exhibited discriminative potential for diastereomers, with the ability to distinguish between S,S and R,R configurations, albeit with an R chiral value of ~1.8. However, differentiation between R,S and S,R configurations was not achievable. (2) Alkali adductions (lithium and sodium) only discerned diastereomers. The R chiral values of the diastereomers obtained from alkali adduct ions were significantly lower than those obtained from protonated ions. (3) Therefore, a third approach was used to address the challenge of distinguishing between R,S and S,R configurations, including the introduction of chiral references (ref) and transition metals (M II ) to form metal-bound complexes [M II (A)(ref)-H] + . Additionally, we synthesized a novel ligand, 4-(N-tert-butoxycarbonyl [Boc]-L-prolinamido)phenol (denoted as ligand A), by modifying N-t-Boc-L-Pro with 2-aminophenol, which, in combination with Cu II and Ni II , enabled simultaneous differentiation of all four isomers. Cu II complexes exhibited significant chiral selectivity between R,S and S,R configurations. Density functional theory calculations were performed to further elucidate the stereodynamic behavior and stoichiometry of these ions in the gas phase. These calculations revealed the interaction energy and coordination sites of the precursor ions in the gas phase, correlating well with MS/MS experiment results. Additionally, the logarithm of the Cu II complexes' characteristic fragment ion abundance ratio demonstrated a strong linear relationship with enantiomeric excess ( ee ). This study presents a novel strategy for chiral drug quality control that eliminates chromatographic separation.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Zheng Yang,Zhang Lin,Wang Xiaocong,Guo Fenghui,Xing Yi,Li Guoliang,Yue Tao
The substantial amount of mercury emissions from coal-fired flue gas causes severe environmental contamination. With the Minamata Convention now officially in force, it is critical to strengthen mercury pollution control. Existing activated carbon injection technologies suffer from poor desulfurization performance and risk secondary-release risks. Therefore, considering the potential industrial application of adsorbents, we selected cost-effective and readily available activated coke (AC) as the carrier in this study. Four metal selenides—copper, iron, manganese, and tin—were loaded onto the AC to overcome the application problems of existing technologies. After 120 min of adsorption, the CuSe/AC exhibited the highest efficiency in removing Hg 0 , surpassing 80% according to the experimental findings. In addition, the optimal adsorption temperature window was 30–120 °C, the maximum adsorption rate was 2.9 × 10 −2 mg·g −1 ·h −1 , and the effectiveness of CuSe/AC in capturing Hg 0 only dropped by 5.2% in the sulfur-containing atmosphere. The physicochemical characterization results indicated that the AC surface had a uniform loading of CuSe with a nanosheet structure resembling polygon and that the Cu-to-Se atomic ratio was close to 1:1. Finally, two possible Hg 0 reaction pathways on CuSe/AC were proposed. Moreover, it was elucidated that the highly selective binding of Hg 0 with ligand-unsaturated Se − was the key factor in achieving high adsorption efficiency and sulfur resistance in the selenium-functionalized AC adsorbent. This finding offers substantial theoretical support for the industrial application of this adsorbent. Graphical Abstract
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
Shikun Tong,Yuemeng Ren,Yanxin Jin,Kele Yan
Solidified natural gas has obtained much attention in gas storage applications. However, the slow rate of hydrate formation and the requirement for agitation reactor restrict the technology development. In this work, we study the hydrate formation within activated carbon static reactor coupled with amino acids. The effect of four amino acids, three activated carbon particles and three water-to-AC ratio on hydrate formation was systemically investigated. The tryptophan has the best-promoting performance as promoter on hydrate formation. The conversion ratio and the maximum growth rate is 0.78 ± 0.04 and 23.78 ± 1.38 V·V−1·min−1, respectively. The large activated carbon particles and high water-to-AC ratio provide abundant granular lattice and free water to promote hydrate formation. Compared with the pure L-tryptophan solution system, the maximum growth rate of hydrate increased by 8.9 and 17.3% in middle activated particles size and large size coupled with L-tryptophan. The maximum growth rate of hydrate in the activated carbon static bed coupled with L-tryptophan is 24.2 ± 0.1, 27.9 ± 0.11, and 30.1 ± 0.12 V·V−1·min−1 at water-to-AC ratio of 0.3, 0.5, and 1, respectively. The combination of large-size activated carbon particles, high water-to-AC ratio and the L-tryptophan are very useful scheme designs. This research offers guidelines for process optimization in future large-scale methane storage applications by hydrate.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lin Ai,Hui Ding,Yutong Jiao,Zeling Zhou,Xiao-Feng Wu,Peidong Li,Shengjun Huang
In the field of heterogeneous catalysis, the selective hydrogenation of α,β-unsaturated aldehyde to α,β-unsaturated alcohol is a prominent focus in the synthesis of fine chemicals. Herein, we present a straightforward protocol for constructing hierarchical zeolite supported catalysts for the gas-phase selective hydrogenation of α-methylacrolein to methallyl alcohol. Compared to the original microporous zeolite, the incorporation of mesoporous channels within the hierarchical zeolite gives rise to ample space to embed Ag nanoparticles, thereby delivering a positive effect on enhancing accessibility to metal active sites and leading to increased reactivity. Moreover, unlike the typical transition metals (Pt, Ni, Cu and Co), the unique surface properties of metal Ag inherently plays a crucial role in the formation of a desirable adsorption configuration. The resulting vertical orientation (on-top η1-σ(O) mode) causes the carbonyl group to interact with the Ag active sites via the terminal oxygen atom, while the C=C bond tilts away from the metal surface. Specifically, the selectivity to the targeting methallyl alcohol reaches ~75% over the hierarchical ZSM-5 and Silicalite-1 supported Ag catalysts under optimal reaction conditions. This discovery highlights the significance of pore architecture and adsorption configuration on the catalytic performance, and aims to deepen understanding for the rational design of heterogeneous catalysts in the gas-phase selective hydrogenation of α,β-unsaturated aldehydes.
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Wang Jintang,Xu Jiaqi,Bai Yujing,Xu Hao,Liao Bo,He Guolei,Li Yiyao,Li Wenbiao
Natural gas hydrate is a promising unconventional natural gas source due to its high energy density and huge global reserves. During exploitation, the drilling fluid may invade the hydrate formation and induce hydrate decomposition, causing reservoir damage. Herein, a novel reservoir protectant made by bio-degradable temporary plugging material (BDTPM) was developed in the form of polymer-ceramic composite microcapsules. As an additive to the drilling fluid, the BDTPM can minimize drilling fluid intrusion by plugging the reservoir during drilling and afterwards maximize permeability recovery by degrading the material. The particle size distribution was in the range of 1–130 μm. The optimal mass ratio between modified ceramic particles, ethyl cellulose and epoxy resin was found to be 4:2:1. The plugging rate was 100% when ethyl cellulose and epoxy resin were mixed to coat the ceramic particles to form BDTPM, and the plugging performance was the best. At a temperature close to the typical hydrate reservoir environment (5 °C), 0.02 wt% low-temperature complex enzyme can degrade BDTPM, and the permeability recovery rate is 64.66%. The efficient reservoir protectant developed in this work could play an important role in the successful drilling of natural gas hydrate reservoirs.
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Soft Robotics
·
2024
·
IF 6.4
Yang Qu,Yiming Zhang,Boyuan Huang,Cheng Chen,Huacen Wang,Sicong Liu,Hongqiang Wang
Currently, pneumatic soft actuators are widely used due to their impressive adaptability, but they still face challenges for more extensive practical applications. One of the primary issues is the bulky and noisy air compressors required to generate air pressure. To circumvent this critical problem, this work proposes a new type of air pressure source, based on the vapor pressure at the gas–liquid equilibrium to replace conventional air pumps. Compared with the previous phase transition method, this approach gains advantages such as generating gas even at low temperatures (instead of boiling point), more controllable gas output, and higher force density (since both ammonia and water contribute to the gas pressure). This work built mathematical models to explain the mechanism of converting energy to output action force from electrical energy and found the aqua ammonia system is one of the optimal choices. Multiple prototypes were created to demonstrate the capability of this method, including a pouch actuator that pushed a load 20,555 times heavier than its dead weight. Finally, based on the soft actuator, an untethered crawling robot was implemented with onboard batteries, showing the potentially extensive applications of this methodology.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jianwang He,Hu Meng,Xiaoxin Wang,Yan Xu,Liang Feng
Hexafluoroethane (CF 3 CF 3 ) is a significant greenhouse gas and a potential threat to the environment as emissions increase. However, there is no simple and effective method to detect CF 3 CF 3 yet. Hence, we first attempted to use metal oxide semiconductor (MOS) gas sensors for CF 3 CF 3 detection. Pristine SnO 2 and S-doped SnO 2 (1–3, representing different S contents) nanoparticles were synthesized. S elements successfully doped into the crystal structure of SnO 2 . The optimized sensor (S-SnO 2 -2) shows excellent CF 3 CF 3 sensing performance at 200 °C. The response value of the S-SnO 2 -2 sensor to 25 ppm CF 3 CF 3 at 200 °C is 13.44, which is significantly higher than the pristine SnO 2 response value of 4.45. The S-SnO 2 -2 sensor also exhibits a short response and recovery time (10 s and 148 s), reliable linear response, excellent selectivity, low limit of detection (0.5 ppm), satisfactory reparability, and good long-term stability. The sensing process of CF 3 CF 3 has been investigated by means of gas chromatography-mass spectrometry (GC-MS). The excellent sensing performance of CF 3 CF 3 in the S-SnO 2 -2 sensor can be attributed to the abundant active oxygen, excellent electron capture capability, and fast charge transfer of S-SnO 2 -2, which also benefits from its smaller grain size. This work is the first to report CF 3 CF 3 sensing using MOS gas sensors and has developed a feasible way for CF 3 CF 3 detection.
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Processes
·
2024
·Vol. 12
·期 9
·1798
·
IF 2.8
Yuanqing Wang,Wenyao Ma
A system combining gas-phase oxidation and liquid-phase collision absorption for removing NO from marine diesel engine exhaust was proposed. This method was the first to utilize different physical states of the same mixed solution to achieve both pre-oxidation and impingement reduction absorption of exhaust gases. During the pre-oxidation stage, a mixture of (NH4)2S2O8and urea solution was atomized into a spray using an ultrasonic nebulizer to increase the contact area between the oxidant and the exhaust gas, thereby efficiently pre-oxidizing the exhaust gas in the gas phase. In the liquid-phase absorption stage, the (NH4)2S2O8and urea solution was used in an impingement absorption process, which not only enhanced gas–liquid mass transfer efficiency but also effectively inhibited the formation of nitrates. Experimental results showed that, without increasing the amount of absorbent used, the maximum NO removal efficiency of this method reached 97% (temperature, 343 K; (NH4)2S2O8concentration, 0.1 mol/L; urea concentration, 1.5 mol/L; NO concentration, 1000 ppm; pH, 7; impinging stream velocity, 15 m/s), compared to 72% using the conventional liquid-phase oxidation absorption method. Additionally, this method required only the addition of a nebulizer and two opposing nozzles to the existing desulfurization tower to achieve simultaneous removal of sulfur and nitrogen oxides from the exhaust gas, with low retrofitting costs making it favorable for practical engineering applications.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Chen Yong-Jun,Xu Yi-Ming,Ye Xiao-Liang,Luo Zhi-Peng,Zhu Shi-Peng,Li Ke-Feng,Lu Jiang-Feng,Wang Guan-E,Xu Gang
To significantly enhance reaction efficiency of porous heterojunctions in various applications, precise engineering of customization heterostructures through energy-level modulation is indispensable. Herein, the preparation of a core-shell porous heterojunction, UiO-66@TDCOF, is reported. Taking advantage of adjustable structure of metal-organic frameworks (MOFs), the energy-level of UiO-66 core is tailored to precisely align with that of porphyrin-based covalent organic framework (denoted as TDCOF) shell. As a results, the heterojunction transitions flexibly from a type-I to a type-II configuration, which remarkably enhances the efficiency of charge separation under light irradiation, resulting in exceptional performances in chemiresistive gas sensing. Notably, the sensitivity of (NH 2 ) 1.24 -UiO-66@TDCOF towards NO 2 is at a high level among all reported heterojunctions under visible-light condition, surpassing the majority of previously reported MOF and COF materials. This research not only presents a strategy for the design of heterojunctions but also gives an approach to material design tailored for chemical applications.
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