CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Peipei Zhao,Mingyu Guo,Qingling Liu,Lijun Fan,Jinfeng Han,Caixia Liu,Na Ji,Chunfeng Song,Degang Ma,Zhenguo Li
A series of Mn a Zr b Cr c O x catalysts with different Cr/Mn molar ratios were synthesized via co-precipitation for the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). It was found that a Mn 5 Zr 2 Cr 2.5 O x catalyst with a Mn:Zr:Cr ratio of 5:2:2.5 exhibited excellent low-temperature activity and the best levels of H 2 O resistance at a high weight hourly space velocity (WHSV) of 54,000 ml/(h·g). NO conversion levels were measured as greater than 87% within a temperature range of 150–250 °C, and catalytic performance levels reached 90% even 50 h after reactions occurred in the presence of 15% H 2 O at 230 °C. The characterization results show that strong interactions occurring between Mn, Zr and Cr oxides and higher quantities of Mn 4+ and Lewis acid sites improved the redox properties and facilitated H 2 O resistance. In situ diffuse reflectance infrared Fourier transform spectra ( in situ DRIFTS) show that coordinated NH 3 on Lewis acid sites and bidentate nitrates play important roles in SCR reactions and that such reactions follow both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms. The competitive adsorption of H 2 O and NO may be the main cause of the adverse effects of H 2 O on catalytic performance.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Shilin Zhao,Xingyu Xie,Yiren Liao,Yuchen Wang,Zhiqiang Sun
Arsenic emitted from coal-fired power plants has attracted widespread attention. Metal oxides are promising adsorbents for arsenic removal , but the influence laws and mechanisms of temperature and flue gas components on their arsenic removal performance are unclear. In this work, systematic research on the effects of adsorption temperature and flue gas components on As 2 O 3 removal by Fe 2 O 3 , CaO, and γ-Al 2 O 3 was conducted. The results show that As 2 O 3 removal ability satisfies Fe 2 O 3 > CaO > γ-Al 2 O 3 at 300–900 °C, which is mainly related to their basic site strength. At 500 °C, Fe 2 O 3 has the largest As 2 O 3 removal capacity (adsorption capacity: 158.4 μg/g; removal efficiency: 84.68%). Increasing adsorption temperature is beneficial to the transformation of arsenic to high-valent arsenic (As(V)) on the surface of Fe 2 O 3 , CaO, and γ-Al 2 O 3 . Low-concentration SO 2 will compete with As 2 O 3 for adsorption on the three metal oxides surface, which thereby inhibits their As 2 O 3 removal ability. The presence of NO has an obvious inhibitory effect on the As 2 O 3 removal of Fe 2 O 3 , CaO, and γ-Al 2 O 3 , which is little affected by the change of NO concentration. Fe 2 O 3 is a metal oxide adsorbent with strong arsenic removal potential. Compared with basic simulated flue gas (BSFG) components, the presence of SO 2 , NO, and SO 2 +NO in the simulated flue gas all inhibits the adsorption of As 2 O 3 by Fe 2 O 3 . Finally, future work on arsenic removal from coal-fired flue gas adsorbents is presented. This work has important engineering applications and theoretical research guiding significance for the development of high-performance arsenic removal adsorbents.
研究领域:
环境科学
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能源工程
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2021
·Vol. 31
·期 37
·2101024
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IF 18.808
Zhengxin Zhu,Yahan Meng,Yi Cui,Wei Chen
Rechargeable hydrogen gas batteries are highly desirable for large-scale energy storage because of their long life cycle, high round trip efficiency, fast reaction kinetics, and hydrogen gas profusion. Coupling advanced cathode chemistries with hydrogen gas anode is an emerging and exciting area of research. Here, a novel high-performance aqueous iodine-hydrogen gas (I 2 -H 2 ) battery using iodine as cathode and hydrogen gas as the electrocatalytic anode in environmentally benign aqueous electrolytes is reported. The working chemistry of the battery involves I 2 /I − solid-liquid reactions occurring over the cathode along with H 2 /H 2 O gas-liquid reactions at the anode, achieving a high rate performance of 100 C and long-lasting stability of over 60 000 cycles. Additionally, the static aqueous I 2 -H 2 battery displays a volumetric capacity of 15.5 Ah L −1 along with good self-healing capability towards cell overcharge. The current battery design exhibits robust electrochemical performance irrespective of acidic, neutral, and alkaline electrolyte systems. This study paves the way towards the industrialization of economically effective, high-power density, and long-term I 2 -H 2 batteries for large-scale energy storage applications.
研究领域:
能源科学
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材料科学
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电化学
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DOI
高影响因子
Energy & Environmental Materials
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2021
·Vol. 5
·期 1
·327-336
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IF 15.122
Huajun Zhao,Jun Wang,Huaiyu Shao,Kang Xu,Yonghong Deng
Gas generation induced by parasitic reactions in lithium-metal batteries (LMB) has been regarded as one of the fundamental barriers to the reversibility of this battery chemistry, which occurs via the complex interplays among electrolytes, cathode, anode, and the decomposition species that travel across the cell. In this work, a novel in situ differential electrochemical mass spectrometry is constructed to differentiate the speciation and source of each gas product generated either during cycling or during storage in the presence of cathode chemistries of varying structure and nickel contents. It unambiguously excludes the trace moisture in electrolyte as the major source of hydrogen and convincingly identifies the layer-structured NCM cathode material as the source of instability that releases active oxygen from the lattice at high voltages when NCM experiences H2 → H3 phase transition, which in turn reacts with carbonate solvents, producing both CO 2 and proton at the cathode side. Such proton in solvated state travels across the cell and becomes the main source for hydrogen generated at the anode side. Mechanisms are proposed to account for these irreversible reactions, and two electrolyte additives based on phosphate structure are adopted to mitigate the gas generation based on the understanding of the above decomposition chemistries.
研究领域:
电化学
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储能
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电池技术
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材料科学
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分析化学
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DOI
高影响因子
Nanoscale
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2016
·Vol. 8
·期 16
·8696-8703
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IF 7.76
Fangxu Ji,Xianpei Ren,Xiaoyao Zheng,Yucheng Liu,Liuqing Pang,Jiaxing Jiang,Shengzhong (Frank) Liu
By taking advantages of both grinding and sonication, an effective exfoliation process is developed to prepare two-dimensional (2D) molybdenum oxide (MoO3) nanosheets. The approach avoids high-boiling-point solvents that would leave a residue and cause aggregation. Gas sensors fabricated using the 2D-MoO3 nanosheets provide a significantly enhanced chemical sensor performance. Compared with the sensors using bulk MoO3, the response of the 2D-MoO3 sensor increases from 7 to 33; the sensor response time is reduced from 27 to 21 seconds, and the recovery time is shortened from 26 to 10 seconds. We attribute the superior performance to the 2D-structure with a much increased surface area and reactive sites.
研究领域:
材料科学
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化学传感器
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Shang Gao,Chenyu Wang,Xinmeng Li,Ruihua Yuan,Qin Zhang,Juan Zhao,Hongwei Chu
Amorphous CoSnO 3 was synthesized by heating CoSn(OH) 6 at 300 ℃. Characterization results indicate that the metal-hydroxyl bond in CoSn(OH) 6 is converted into metal-oxygen bond in CoSnO 3 . The synthesized CoSnO 3 is completely amorphous and consisted of nanocubes with an average size of about 70 nm. Gas sensing results show that the amorphous CoSnO 3 exhibits an immense response of 202.2 to the triethylamine (TEA) vapor with a concentration of 100 ppm at the temperature of 100 ℃. The experimental results also confirmed the superior gas selectivity and long-term stability of the amorphous CoSnO 3 . The enhanced gas detection properties were attributed to the abundant oxygen vacancy defects, large specific surface area and advanced porosity induced by the amorphous structure of CoSnO 3 . The presented synthesis strategy could facilitate the advancement of metal oxide semiconductor (MOS) gas sensors hereafter.
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产品关联
DOI
高影响因子
Food Chemistry-X
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2024
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IF 6.5
Leyin Cui,Xin Wang,Changxu He,Zhengquan Liu,Jin Liang
The effect of puffing treatment on the volatile components of green tea has been studied. A total of 155 volatile compounds were identified by using HS-SPME and SPE extraction methods, combined with gas chromatography–mass spectrometry (GC–MS). The total concentration of volatile compounds in puffed green tea increased by 2.25 times compared to that in before puffing. 12 key volatile compounds in green tea were identified before and after puffing using a combination of multivariate statistical analysis, GC-O, AEDA dilution analysis, and relative odor activity value (rOAV). The puffing process generates the Maillard reaction, where sugars react with amino acids to produce Maillard reaction products (such as pyrazine, pyrrole, furan, and their derivatives), giving them a unique baking aroma. The proportion of these compounds in the total volatile matter increased. The research results provided guidance and a theoretical basis for improving the aroma processing of green tea.
研究领域:
食品科学
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茶学
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分析化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2023
·Vol. 11
·期 29
·15811-15820
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IF 11.9
Qiaoqiao Zou,Bin Liu,Yong Zhang
The accurate identification of trace gases has become an important subject in the field of environmental monitoring due to the ppb-level permissible upper limit of indoor harmful gases. However, there are two challenges in trace gas detection, namely, the signal caused by the gas sensor is weak due to the extremely low concentration of trace gas, and the response signal of the target gas may be interfered by other gases owing to the crossing-sensitivity of materials. Herein, a carbon-based field effect transistor (FET) gas sensor array based on multi-sensing gates is presented. Based on the intrinsic amplifying effect of the field effect transistor, the proposed carbon-based FET-type gas sensor unit can detect the weak signal generated by 80 ppb gas at room temperature. Through the construction of the carbon-based FET gas sensor array structure with multi-sensing gates, the correlations between multiple parameters and gas species and concentrations are established, so as to realize the purpose of identifying the single unknown gas with an accuracy of 97.51%. This work provides a new strategy to develop micro gas sensor chips for accurate detection of trace gases at room temperature.
研究领域:
材料科学
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环境科学
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电子工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Ru Zhou,Ping Guo,Zhengkun Tian
Water intrusion in gas reservoirs with strong aquifer drives and pronounced heterogeneity presents significant challenges for production efficiency and cost control, as conventional rate management and drainage strategies often fail to address preferential water flow paths and trapped gas issues. Existing water shut-off technologies are constrained by poor agent transportability, imprecise placement, and neglect of the gas–water interface equilibrium. This study presents an advanced chemical water shut-off strategy that constructs large-area, crosslinked polymer water-blocking barriers directly at the gas–water interface within porous media through interfacial spreading-polymerization. The approach employs specific surfactants to enhance the spreading of an oil-phase monomer solution, thereby enabling broad interfacial coverage, while simultaneous in situ interfacial polymerization generates robust, crosslinked polymer networks. Specifically, the plugging system comprises two components: an oil solution and an aqueous solution. The oil solution contains cyclohexane, 0.1 wt% trimesoyl chloride (TMC), and the spreading agent octylphenol polyoxyethylene-4 (OP-4), which imparts strong spreading capacity to facilitate broad distribution of the TMC monomer. The aqueous solution comprises water, 2 wt% m-phenylenediamine (MPD), and sodium hydroxide. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman, and scanning electron microscopy (SEM) analyses confirm that the barrier is a highly cross-linked three-dimensional polyamide network with a highly dense internal structure and a thickness exceeding 300 µm, capable of effectively blocking pores, throats, and most natural fractures. Core flooding experiments further demonstrate that the barrier has substantial water-blocking performance, especially in low-permeability porous media.
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Huahui Liang,Mingwei Cai,Fuhui Liang,Shiyang Zhang,Yonggang Min
Carbon molecular sieve membranes (CMSMs) face a fundamental permeability-selectivity trade-off, as defined by the Robeson upper bound. Here, we engineer CMSMs via copolymerization of hydroxy-functionalized polyimide (6FDA-6FAP) with polydimethylsiloxane (PDMS). Incorporating flexible siloxane chains promotes denser chain aggregation and provides additional gas transport channels. During pyrolysis, the decomposition of siloxane segments generates additional micropores, thereby enhancing gas permeability. Simultaneously, PDMS-induced silicon inter-layer crosslinking promotes tighter packing of carbon strands, which reduces inter-layer spacing and consequently improves gas selectivity. Systematic comparison of hydroxyl (-OH) and amine (-NH 2 ) functional groups reveals that –OH groups in PDMS form extensive hydrogen-bonding networks with 6FAP, inducing crosslinking that enhances precursor chain packing. The optimized PCMS-OH membrane achieves H 2 and CO 2 permeability of 10,568 and 1,768 Barrer, with H 2 /CH 4 and CO 2 /CH 4 selectivity of 320 and 53, respectively, which far exceed the latest Robeson upper bound. Moreover, silicon-induced crosslinking reduces aging kinetics, retaining 57 % higher H 2 permeability after 60 days. This work demonstrates a precursor engineering strategy to break the trade-off barrier for sustainable hydrogen purification and carbon dioxide capture.
研究领域:
材料科学
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膜分离技术
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高分子化学
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能源化工
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环境工程
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产品关联
DOI
高影响因子
ACS Sensors
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2025
·
IF 9.1
Peng Wang,Ming Li,Zhiyuan Zhu,Chengli Tang
With the advancement of smart detection technologies, gas sensors have gained increasingly widespread applications in environmental monitoring, industrial safety, medical diagnostics, and intelligent agriculture. The response curve of a single gas sensor is conventionally used to calculate sensor performance evaluation parameters of response/recovery time and response value. The selectivity of a single sensor is currently evaluated by a selectivity coefficient based on the response value, which faces difficulty in distinguishing gases with different concentrations. In this study, a new metric of fill factor (FF) derived from response curve morphology features was introduced to offer a novel solution for single-sensor selectivity analysis. Three variants of the novel metrics, FFres (response phase fill factor), FFrec (recovery phase fill factor), and FF (total fill factor), can be calculated from the response curve. As a proof-of-concept, the FFs of WS2, WS2@PANI, and Au/PANI/WS2 sensors at different concentrations of ammonia, acetone, methanol, ethanol, and water vapor were calculated and used for gas selectivity analysis. Results demonstrated distinct FF ranges for ammonia and other gases, validating FF as a potential selectivity indicator. This approach provides a multidimensional analysis framework for enhanced single-sensor discrimination by constructing a parameter space incorporating curve morphology features.
研究领域:
传感器技术
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环境监测
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工业安全
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智能农业
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生物医学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2019
·Vol. 7
·期 2
·73
·
IF 1.963
Gui Fu,Ziqi Zhao,Chuanbo Hao,Qiang Wu
In order to effectively prevent coal mine accidents, we selected the most serious type of accident in coal mines—gas explosions—as the research object. Based on the accident causation model (24Model), we propose an action path and analysis steps of accidents caused by different employees in the organization. A gas explosion coal mine accident was analyzed using the 24Model and the proposed action path, and 12 unsafe actions, 3 unsafe states, 4 habitual behaviors, 10 safety management systems, and 10 safety cultures were obtained. Case analysis results show that by using the 24Model and path analysis the proposed effect can help employees to clearly identify the cause of the accident, to better understand the logical relationship with the causes of the accident, improve the effectiveness of training, and effectively prevent similar accidents. The 24Model and the proposed path can be used to comprehensively analyze the reasons for and help to effectively prevent coal mine gas explosion accidents.
研究领域:
矿山安全
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事故预防
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安全工程
·
风险管理
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DOI
高影响因子
危险品化学品经营许可证（带存储）