CATALYSIS TODAY
·
2025
·
IF 5.3
Yupeng Tian,Yujia Liu,Shoutao Ma,Wei Xu,Chenyang Zhao,Bing Sun
This study introduces a heart-like micromixer reactor and Au/TS-1 catalyst to address the dual challenges of safety and efficiency in gas-phase propylene epoxidation using H 2 and O 2 . Conventional methods face inherent explosion risks and rapid catalyst deactivation due to sintering and coking. The microreactor architecture achieves over 99% flame-quenching efficiency via sub-millisecond radical suppression and enhanced heat transfer, enabling safe operation with minimal inert gas dilution (N 2 < 70 vol%). Coupled with alkali-promoted Au/TS-1 catalysts, the system sustains > 90 % propylene oxide (PO) selectivity for 500 h, outperforming static mixers where activity halved within 100 h. This work pioneers a reactor-catalyst co-design strategy, decoupling safety constraints from reaction efficiency, and establishes a scalable platform for sustainable PO synthesis. Besides, the critical gaps in industrial-scale implementation of explosive gas-phase reactions is bridged.
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Chen Li,Can Xie,Gangtian Zhu
High molecular weight carboxylic acids (HMw-CAs), including steroid acids and hopanoic acids, are unique biomarker compounds in petroleum samples. This study introduces a mixed-mode solid phase extraction (SPE) method for the separation of these acids from crude oils. By combining hydrophobic and ion-exchange interactions, the mixed-mode SPE achieved superior recovery for separation of HMw-CAs compared to the conventional ion-exchange sorbent. The optimized SPE was coupled with gas chromatography-mass spectrometry to characterize individual steroid acids in biodegraded oils. As a result, 7 steroid acids with carboxyl groups on C-3 position were identified. Quantitative assessments of steroid acid concentrations across samples with varying biodegradation levels indicate that these acids likely originated during early diagenesis rather than forming through in-reservoir biodegradation of steranes. Notably, the observed resistance of these steroid acids to biodegradation suggests their potential as molecular markers for oil-source correlation in severely biodegraded petroleum systems.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Huaneng Su,Tianen Wu,Huiyuan Liu,Weiqi Zhang,Qian Xu,Jianwei Ren
Liquid water flooding is one of the major challenges in the high current density operation of proton exchange membrane fuel cells (PEMFCs). Optimizing microstructure and properties of gas diffusion layer (GDL), as an essential diffusion medium in PEMFCs, is considered as a promising approach to ensure the long-term stable operation of PEMFCs at high current densities. Herein, we report a simple elevated temperature treatment technique to enhance the hydrothermal durability and water removal capacity of GDLs. Although elevating the heat-treatment temperature from 330 °C (most commonly used) to 430 °C has no obvious impact on the GDLs’ surface hydrophobicity , the GDL treated at 430 °C exhibits excellent hydrothermal stability and water removal capacity due to the increased dispersion of polytetrafluoroethylene (PTFE). In PEMFC, the membrane electrode assembly (MEA) containing the elevated-temperature-treated GDL could maintain high performance at high current densities and high humidity conditions. 200 h steady state test at high current densities and high humidity conditions manifests that the MEA with elevated-temperature-treated GDL is more stable and has better water removal capacity than the MEA with normal-temperature-treated GDL.
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高影响因子
PROGRESS IN REACTION KINETICS AND MECHANISM
·
2017
·
IF 0.682
Jiao Jing Zhang,Wen Yi Wang,Guo Jian Wang,Cheng Kai,Hua Song,Lu Wang
A model natural gas consisting of hydrogen sulfide, nitrogen and oxygen mixture was used to simulate materials to test the performance of an amine-modified MCM-41 adsorbent prepared by the impregnation method. The adsorbent was characterised by X-ray diffraction analysis, Brunauer–Emmett–Teller analysis, Fourier-transform infrared spectroscopy, transmission electron microscopy and scanning electron microscopy. The results showed that more molecules are able to penetrate the pores following modification, resulting in rapid structural collapse, thus lowering the diffraction intensity. Although the capacity of amine-modified MCM-41 decreased the physical adsorption, chemisorption increased significantly. (3-Aminopropyl)trimethoxysilane/MCM-41 was found to exhibit a good performance for H2S desulfurisation. At 45 °C the breakthrough time was 186 min, the saturated sulfur capacity was 134.38 mg g−1 and the degree of desulfurisation was 54.19%. The adsorption isotherm and kinetics were investigated and the relevant parameters were obtained. The results showed that the adsorption isotherm could be well fitted by the Langmuir model and the maximum adsorption capacities increased with increase of temperature. The adsorption kinetics could be represented by the Bangham model, which suggested that chemical reaction seemed significant in the rate-controlling adsorption step. The adsorption process was spontaneous and exothermic.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Yingying Shi,Meiling Qi
This work presents the investigation of two aliphatic polycarbonate diols (CAPC and HAPC) as the stationary phases for capillary gas chromatography (GC). The CAPC and HAPC capillary columns showed moderate polarity and high column efficiency of 3704 – 4545 plates/m measured by n-octanol and naphthalene at 120 °C. It was found that despite their similar chemical compositions, CAPC and HAPC differ largely in their selectivity towards the isomers of alkanes, methylpyridines and xylenes. As demonstrated, the CAPC column exhibits advantageous comprehensive performance over the HAPC column and the commercial PEG column. Particularly, the CAPC column exhibits higher resolving performance towards the isomers indicated above and the Grob mixture than the HAPC column. Also, it shows distinct advantages over the PEG column in separating the Grob mixture, the isomers of diethylbenzenes and cymenes, and practical analysis of chemical products and the essential oil from the leaves of Rhododendron dauricum L. Additionally, the CAPC column has excellent repeatability and reproducibility on analyte retention times with the relative standard deviation (RSD) values in the range of 0.05% – 0.08% for run-to-run, 0.12% – 0.19% for day-to-day and 2.6% – 4.9% for column-to-column, respectively. Its applications to purity test of chemical products and GC–MS analysis of the essential oil demonstrate its promising future for practical GC analyses.
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·7924-7931
·
IF 2.936
Yanling Wang,Yongfei Li,Qian Wang,Qiang Li,Yue Zhang,Lin Yuan
The wettability of a rock’s surface is a vital factor for gas flow and fracturing fluid backflow. As a result of this, novel and effective gas wetting alteration agents are required. In this work, a gas-wetting alteration agent, N,N-bis(perfluorooctyl)imine acetate sodium, was synthesized and characterized by different methods. The wettability of a rock’s surface was evaluated by contact angle and imbibition measurements, the Owens two-liquid method and glass capillary tube rise testing. The results showed that after treatment with 0.5 wt% N,N-bis(perfluorooctyl)imine acetate sodium the contact angles of water and n-hexadecane on the surface of the rock increased from 36° and 0° to 140° and 119°, respectively. The surface free energy rapidly reduced from primeval 72 mN m−1 to 3.4 mN m−1 after treatment with 0.3 wt% N,N-bis(perfluorooctyl)imine acetate sodium. These values agreed with the imbibition measurements and the results of the glass capillary tube rise testing. Moreover, analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of the rock surface significantly increased. The above results fully proved that the wettability of the rock surface is altered from its original water-wetting or oil-wetting to gas-wetting. Furthermore, thermal analysis demonstrated that the gas-wetting alteration agent has good thermal stability, which indicates its great potential to be used as a gas-wetting alteration agent for unconventional gas reservoirs under high temperature conditions.
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高影响因子
PETROLEUM CHEMISTRY
·
2021
·Vol. 61
·期 11
·1305-1318
·
IF 1.029
Zhu Wenxi,Zheng Xiuhua
Abstract Colloidal Gas Aphron (CGA) drilling fluid is one of the most promising
techniques in underbalanced drilling with excellent plugging and reservoir
protection functions. Due to the limitation of poor thermal stability of
commercial foaming agents used in oilfields, the research on high-temperature
resistant CGA drilling fluid is still a challenge. In this study, a
biodegradable glycine foaming agent AGS-12 was synthesized via a one-step
method. The surface activity, foaming performance (25–150°C) of AGS-12 and the
high temperature performance of AGS-12 based CGA drilling fluid (120–150°C) were
studied. All the results provide a basis for the potential application of AGS-12
as an eco-friendly foaming agent in high-temperature CGA drilling fluids: 1) The
product AGS-12 with 87% conversion rate was synthesized successfully by one-step
method, which can be verified by FT-IR. TGA analysis suggested that AGS-12 had
good thermal stability within 315°C. Moreover, AGS-12 is easily biodegradable
and fully meets the first level discharge standard of petrochemical industry
pollutants. 2) AGS-12 can reduce the surface tension of solvent water from 72.38
to 28.44 mN/m. Analysis of fundamental surface activity parameters illustrates
the higher surface activity of AGS-12, compared with a variety of amino acid
surfactants. 3) Waring-Blender test showed that foams generated by 3% AGS-12
always have higher half-life, foam quality and lower drainage speed than the
foaming agents available on market within 150°C. 4) At 120/140/150°C, aphrons
with diameter of 10–150 µm have been successfully generated in CGA drilling
fluid by using AGS-12 as foaming agent. Rheological and filtration tests
suggested that AGS-12 based CGA drilling fluid is a high-performance drilling
fluid with strong shear thinning behavior, high viscosity, and low filtration
invasion.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 9
·4321-4329
·
IF 2.961
Zhang Jin-Zhong,Wu Shuai,Shen Fengxia,Song Wenkang,Hua Yaxin,Wu Zhenyu,Zhang Xiao-Gang,Shi Jin
A novel gas diffusion electrode (GDE) electrolyzer has been constructed to convert CO 2 into CO, with chlorine (Cl 2 ) and sodium carbonate (Na 2 CO 3 ) produced as the by-products. Using this method, the product value yielded from CO 2 electrolysis can be increased substantially. In contrast to the conventional GDE electrolyzer, we use a cation-exchange membrane as the diaphragm to separate the cathode from the anode compartment, and use NaCl aqueous solution as the anolyte. During the electrolysis process, CO 2 is reduced to CO on the cathode, with CO 3 2− generated accompanied with CO formation. On the anode, Cl − is oxidized to Cl 2 . Na + in the anode chamber transfers through the cation-exchange membrane, and migrates into the catholyte. Thus, Na 2 CO 3 can be obtained owing to the co-existing of Na + and CO 3 2− in the catholyte. Using this method, CO 3 2− penetrating through the anion-membrane can be avoided. This problem has been considered as the crucial obstacle that impedes the practical utilization of the conventional GDE electrolyzer. Our designed GDE electrolyzer has a promising application perspective in the phosgene chemical industry.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziyu Qin,Xiaoxiao Song,Junyong Wang,Xiang Li,Congyi Wu,Xiaoxia Wang,Xueqiong Yin,Dawen Zeng
For the important applications of gas identification related to specific diseases in healthcare, flexible gas sensors have attracted more attention. Among them, two-dimensional transition metal dichalcogenides (2D TMDs) have been known as good promising flexible gas-sensitive materials. While how to tightly attach 2D materials on flexible substrates is still challenging. Here, we propose an enhanced room-temperature flexible paper-substrate sensors based on 2D tungsten disulfide (WS 2 ) with S defects, which are facilely synthesized by chemical exfoliation and vacuum filtration method. Structure characterization shows that most of the as-prepared 2D WS 2 are within 3 layers. Spectroscopic characterization proves the existence of S defects on the surface of 2D WS 2 produced by chemical exfoliation. The room-temperature (25 °C) NH 3 gas sensitivity results show that the response intensity of 2D WS 2 with rich S defects is nearly three times higher than the highly crystalline 2D WS 2 . The results of the flexible gas sensitivity indicate the fast response and high stability of our devices in breathing detection and bending experiments. Furthermore, the devices can effectively distinguish bending stress changes and gas-sensitive response signals at the same time, realizing multifunctional sensing detection. Our work will be a reference for fabricating flexible sensors based on 2D materials.
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高影响因子
Materials
·
2025
·Vol. 18
·期 15
·3436
·
IF 3.2
Nuo Xu,Rentuoya Sa,Yuqing He,Jun Guo,Yiheng Chen,Nana Wang,Yuchuan Feng,Suxia Ma
Circulating fluidized bed fly ash (CFBFA) stockpiles release alkaline dust, high-pH leachate, and secondary CO 2 /SO 2 —an environmental burden that exceeds 240 Mt yr −1 in China alone. Yet, barely 25% is recycled, because the high f-CaO/SO 3 contents destabilize conventional cementitious products. Here, we presents a pressurized flue gas heat curing (FHC) route to bridge this scientific deficit, converting up to 85 wt% CFBFA into structural lightweight gravel. The gypsum dosage was optimized, and a 1:16 (gypsum/CFBFA) ratio delivered the best compromise between early ettringite nucleation and CO 2 -uptake capacity, yielding the highest overall quality. The optimal mix reaches 9.13 MPa 28-day crushing strength, 4.27% in situ CO 2 uptake, 1.75 g cm −3 bulk density, and 3.59% water absorption. Multi-technique analyses (SEM, XRD, FTIR, TG-DTG, and MIP) show that FHC rapidly consumes expansive phases, suppresses undesirable granular-ettringite formation, and produces a dense calcite/needle-AFt skeleton. The FHC-treated CFBFA composite gravel demonstrates 30.43% higher crushing strength than JTG/TF20-2015 standards, accompanied by a water absorption rate 28.2% lower than recent studies. Its superior strength and durability highlight its potential as a low-carbon lightweight aggregate for structural engineering. A life-cycle inventory gives a cradle-to-gate energy demand of 1128 MJ t −1 and a process GWP of 226 kg CO 2 -eq t −1 . Consequently, higher point-source emissions paired with immediate mineral sequestration translate into a low overall climate footprint and eliminate the need for CFBFA landfilling.
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DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xiao Zhang,Xueying Zhang,Cai Liang,Feng Shen,Boxiong Shen
Water poisoning remains a significant challenge for Mn-based catalysts in the purification of low-temperature industrial flue gas. In this study, a water-resistant catalyst, Cu-doped MnO x dispersed on a flower-like hollow sphere carrier (Cu 0.1 Mn 1 -Al 2 O 3 (NF)), was developed. The introduction of 5 % water vapor into simulated flue gas reduced the o-xylene oxidation efficiency of the unmodified MnO x /γ-Al 2 O 3 catalyst by 20 %, whereas Cu 0.1 Mn 1 -Al 2 O 3 (NF) exhibited only a 5 % reduction, and it shows a water resistance surpasses those of most of the reported MnO x catalysts. Upon water vapor withdrawal, Cu 0.1 Mn 1 -Al 2 O 3 (NF) showed a 2 % irreversible efficiency loss, compared to 9 % for MnO x /γ-Al 2 O 3 . Mechanistic studies highlight the role of the flower-like morphology in reducing hydrogen-bonded H 2 O and the primary contribution of Cu + doping in suppressing –OH generation on metal sites, likely due to weakened H 2 O dissociation at Mn-Ov-Cu oxygen vacancies. Additionally, Cu 0.1 Mn 1 -Al 2 O 3 (NF) has improved water desorption capability evidenced by 8 °C lower endothermic temperature for H 2 O volatilization than that of MnO x /γ-Al 2 O 3 . Furthermore, a H 2 O-involved Mars-van Krevelen (MvK) mechanism was proposed to explain the ∼ 2 % irreversible efficiency reduction for Cu 0.1 Mn 1 -Al 2 O 3 (NF) in wet gas − attributed to H 2 O dissociation at oxygen vacancies hindered lattice oxygen replenishment. Based on this mechanism, an air-purging regeneration protocol was developed to enhance the catalyst’s operational stability under wet flue gas conditions.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 30
·305501
·
IF 3.874
Guifang Luo,Lili Xie,Meng He,Rawat Jaisutti,Zhigang Zhu
A flexible fabric gas sensor for the detection of sub-ppm-level NH3 is reported in this paper. The reduced graphene oxide (rGO)-polyaniline (PANI) nanocomposite was successfully coated on cotton thread via an in situ polymerization technique. The morphology, microstructure and composition were analyzed by field-emission scanning electron microscope, x-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy. Furthermore, we have studied the responses of the rGO-PANI nanocomposite-based flexible sensors for the detection of NH3 varying from 1–100 ppm, operated at 22 °C. At the optimized concentration of rGO, the response of these sensors increased by 4–5 times in comparison with the pristine rGO and PANI. These flexible sensors exhibited fast response, remarkable long-term stability, good selectivity and a low detection limit. The sensing mechanism for the high sensing performance has been thoroughly discussed and it is mainly due to the distinctive 1D fiber structure, the formation of a p-p heterojunction between the rGO nanosheets and PANI. The rGO-PANI composite-based fabric sensor with low power consumption is a potential flexible electronic device for the detection of NH3.
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高影响因子
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