Separations
·
2025
·Vol. 12
·期 2
·42
·
IF 2.7
Huihui Wang,Yuqiong Zhao,He Lian,Qi Wang,Zhihong Shang,Guojie Zhang
The separation of CH4and N2is essential for the effective use of low-concentration coalbed methane (CBM). In this study, a series of nitrogen-doped porous carbons were synthesized using an in situ nitrogen doping method combined with K2CO3activation. The study systematically examined how changes in the physical structure and surface properties of the porous carbons affected their CH4/N2separation performance. The results revealed that in situ nitrogen doping not only effectively adjusts the pore structure and alters the reaction of K2CO3on the carbon matrix, but also introduces nitrogen and oxygen functional groups that significantly enhance the adsorption capabilities of the materials. In particular, sample S3Y6−800 demonstrated the highest methane adsorption capacity of 2.23 mmol/g at 273 K and 1 bar, outperforming most other porous carbons. This exceptional performance is attributed to the introduction of N-5, N-6, C-O, and COOH functional groups, as well as a narrower pore-size distribution (0.5–0.7 nm) and the formation of carbon nanotube structures. The introduction of heteroatoms also provides additional adsorption sites for the porous carbon, thus improving its methane adsorption capacity. Furthermore, dynamic breakthrough experiments confirmed that all samples effectively separated methane and nitrogen. The Toth model accurately described the CH4adsorption behavior on S3Y6−800 at 298 K, suggesting that the adsorption process follows a sub-monolayer coverage mechanism within the microporous regions. This study provides a mild and environmentally friendly preparation method of porous carbons for CH4/N2separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jiaoyun Hou,Xiangming Hu,Yanyun Zhao,Zhiang Shao,Weimin Cheng,Shucang Zhu,Chunyu Song,Fusheng Zhu
Water injection into coal seams is important for dust prevention in mines. However, owing to the hydrophobicity of coal itself, the wetting effect of water injection on coal seams has yet to be enhanced. Herein, based on the hydrophobicity of coal, hydrophilic modification of the coal surface has been proposed via co-deposition of polydopamine (PDA) and polyacrylamide (PAM). Using water contact angle (WCA) test, atomic force microscope (AFM) test, X-ray photoelectron spectroscopy (XPS) characterization, and 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR) measurements, the feasibility of hydrophilicity modification of coal by PDA/PAM has been investigated. The results indicate that when DA concentration is 2 mg/mL, deposition time is 45 min, and DA/PAM feeding molar ratio is 1:1, the wettability of modified coal sample clearly improves. In the water content test and dust-production test using gravity drop hammer, the modified coal exhibits good wettability and low dust production. Also, UV-Vis absorption spectroscopy and WCA results suggest that PDA/PAM coating exhibits good stability. Therefore, the modification method can effectively enhance the wetting effect of injected water on coal seam, providing a novel approach for dust prevention.
研究领域:
矿业工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2019
·Vol. 30
·期 9
·1789-1800
·
IF 1.335
Zhang Guojie,Hou Peng,Sun Yinghui,Xu Ying,Cheng Haizhu,Zhang Yongfa
Different activated carbons and manganese-modified activated carbons were prepared as deoxidizers for the low-concentration coalbed methane deoxidation. The results show that the deoxidation performance of the different activated carbons is affected by raw materials for preparation of deoxidizers. One type of activated carbon exhibited the best performance of oxygen removal, due to the relatively low ash content and better adsorption performance. Experimental results show that the manganese-modified deoxidizers exhibit an excellent deoxidation efficiency at low temperature. At 200 ºC, one kind of manganese-modified activated carbons decreased the oxygen content to less than 1 vol%, which could maintain about 600 min. This indicated that the addition of manganese greatly improved the reactivity of oxygen with activated carbon. Characterization results demonstrated that the physical structure and species types of oxygen of activated carbons, and manganese have important effects on the activity of deoxidizers in different temperature ranges.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 5
·2210-2218
·
IF 2.7
Zhaoshun Zhan,Qixing Shi,Lei Wang,Jinfeng Shen,Tianyou Bao,Lixin Li,Fanna Meng
To improve the safety and broaden the application scope of polyurethane in coal mines, a dual-functional DOPO/MA/Mel@NC (DMM@NC) composite with flame retardancy and antistatic properties was designed and synthesized via in situ polymerization followed by introduction into polyurethane with a loading amount of 25 wt%, which considerably enabled flame retardancy, antistatic properties, thermal stability, and combustion performance of the polyurethane. By investigating the chemical composition and microscopic morphology of gaseous pyrolysis products and condensed-phase residues of DMM@NC it was found that the residues contain phosphorus-containing compounds, which promote the carbonification and are beneficial to improve the flame retardancy of polyurethane through a condensed-phase flame-retardant mechanism. Consequently, the dual-functional DMM@NC composite with distinguished flame retardancy and antistatic properties is beneficial to improve the safety of polyurethane in coal mines thus expanding its application range.
研究领域:
材料科学
·
安全工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Yunlong Chen,Jinliang Li,Liman Liu,Yi Li
Coal seam mining generates significant dust, posing serious threats to the safety of mining and the well-being of miners. This study suggests a delayed cross-linking approach to convert the dust suppressant into a gel within the coal seam, introduces a controllable slow-release ionic cross-linking dust suppressant, investigates its seepage behavior, and evaluates its dust suppression effectiveness in a coal seam. The experimental results show that the dust suppressant exhibits low viscosity and high fluidity during injection into the coal seam, facilitating effective infiltration into the seam. By managing the release rate of Ca2+ in the slow-release system, the gelation time of the dust suppressant within the coal seam can be controlled efficiently. While reducing the viscosity, increasing injection pressure promotes material seepage in the coal seam. The optimized injection pressure for the dust suppressant is 7 MPa, and its seepage behavior in the coal seam postinjection resembles that of water. The dust suppressant cross-links and reacts to form a macromolecular mesh structure in tiny internal pores and on the coal seam surface, enhancing the water retention and toughness of the coal seam. These combined mechanisms effectively reduce dust production during coal seam mining, achieving a source reduction of dust production.
研究领域:
采矿工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Zhijie Zhou,Yanting Gao,Wei Xia,Wenbo Shi,Yizhou Liu,Fang Zheng,Zhiguo Zhang,Qiwei Yang,Qilong Ren,Zongbi Bao
The development of advanced adsorbents for methane (CH4) and nitrogen (N2) separation is critical for the efficient utilization of coal-bed methane (CBM), which is a key alternative energy resource. Herein, we report a bimetallic copper–indium-based metal–organic framework (MOF), CuIn(3-ain)4, featuring high-density nitrogen and oxygen sites distributed along its pore surface. These negatively charged atom sites, derived from CuN4 and InO8 clusters, form multiple hydrogen-bonding interactions with CH4, significantly enhancing its adsorption affinity. CuIn(3-ain)4 demonstrates a high CH4 uptake of 1.56 mmol g–1 and excellent CH4/N2 selectivity under ambient conditions, outperforming many reported materials. Dynamic breakthrough experiments confirm that over 90% purity methane can be obtained in a single adsorption–desorption cycle. Grand Canonical Monte Carlo (GCMC) simulations and density functional theory (DFT) calculations reveal that the nitrogen and oxygen sites play a crucial role in selectively recognizing CH4 over N2, leading to a superior separation efficiency. Moreover, the material exhibits excellent cyclic stability and scalability, making CuIn(3-ain)4 a promising candidate for practical CH4/N2 separation in CBM purification. This study provides valuable insights into the design of MOFs for challenging gas separations, emphasizing the role of polar sites in facilitating selective adsorption.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2021
·
IF 9.709
Juan Yang,Pengyu Chen,Jun Dai,Yumei Chen,Liqing Rong,Dazhao Wang
Sunlight-driven photocatalysis is regarded as a promising strategy for direct conversion of methane in low concentration coal mine methane (LC-CMM) to value-added methanol, yet remains a grand challenge to efficiently activate and convert methane. Herein, WO 3−x nanosheets with gradient concentration of oxygen vacancy were synthesized and firstly served as full-spectrum responsive catalysts for transformation of LC-CMM to methanol at ambient conditions. Defect-rich WO 3−x -N2.0 shows a methanol yield of 1475 μmol·g −1 , roughly 4.5 times higher than WO 3 -A2.0 under simulated solar light irradiation. The selectivity of CH 3 OH on the optimal WO 3−x -N2.0 is up to 76%. More importantly, WO 3−x -N2.0 exhibits a methanol yield of 396 μmol·g −1 with the selectivity of 82% even under near infrared light irradiation while almost no CH 3 OH is detected over WO 3 -A2.0. Based on the results of energy-band structure, photoelectrochemical characterization, PLs and EPR tests, the significantly enhanced photocatalytic performance over WO 3−x -N2.0 is ascribed to the synergistic effect caused by the formation of oxygen vacancies, including extending light absorption into NIR region, improving separation of photoinduced electron-hole pairs and boosting production of hydroxyl radicals (key active species that drive CH 3 OH production). This work will offer a sustainable pathway to broaden the utilization of LC-CMM via efficient coupling of solar energy.
研究领域:
化学工程
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hua Shang,Honghao Bai,Xiaomin Li,Jinping Li,Jiangfeng Yang
Coalbed methane (CBM) emissions account for a large part of methane (CH 4 ) emission in the fossil energy area, and vacuum pressure swing adsorption (VPSA) is an effective method to recover low-concentration CBM. However, CBM supply can fluctuate in quality or quantity because of the constantly changing geological conditions, thus permanent large-scale factory mode is economically inappropriate. In this work, a highly integrated mobile skid-mounted prototype VPSA system was designed and installed, and site trials of low-concentration CH 4 capture were, for the first time, carried out in a coal mine site of Huayang New Material Technology Group Co. Ltd in China. Site trials including breakthrough tests and VPSA experiments were conducted in a fluctuating range of CH 4 (16–30%). The effects of flow rate, adsorption pressure, and feed concentration on the separation process were revealed using a breakthrough process, and their effects on the dynamic parameters were also analyzed. After purification, the CH 4 content in product gas was increased from 16–30% to 43.3–70.7% which all meet the requirements of 4T grade city gas in China, and maximum CH 4 productivity of 43.6 × 10 −3 m 3 /(kg·h) can be achieved. More importantly, multicycle breakthrough tests demonstrated that superhydrophobic zeolite TUTJ-1 is more resistant to the effects of water and has more potential for capturing CH 4 under humid conditions than activated carbon.
研究领域:
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zaizheng Jiang,Zhiliang Tu,Zhihe Xin,Guodong Zhang,Fei Wang,Yongtao Zhang
Low-concentration coalbed methane (LCCBM) is an abundant unconventional natural gas resource, but the utilization efficiency of methane (CH4) is very low. Sodium dodecyl sulfate (SDS) enhances hydration for CH4 recovery but generates foams during hydrate dissociation, limiting continuous production. To address this issue, the –SO3– group was fixed on the polystyrene nanopolymers (named –SO3–@PSNS) for enhancing hydration to recover CH4 from 21.59 mol % CH4/78.41 mol % N2 in this work. The optimal CH4 recovery effect was obtained when SDS concentration was 4 mmol/L and –SO3–@PSNS concentration was 8 mmol/L. Due to the foams generated by the addition of SDS during the hydrate decomposition, THF in the system decreased from 1 mol % to 0.37 mol % after the reaction but only decreased to 0.96 mol % when –SO3–@PSNS was added. –SO3–@PSNS has important prospects for the application of hydrate-based CH4 recovery from LCCBM.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Yong Jiao,Liyang Wang,Liqin Zhang,Wenting An,Wei Wang,Wei Zhou,Moses O. Tadé,Zongping Shao,Jianping Bai,Si-Dian Li
This paper studies the electrochemical feasibility of the direct conversion of low-concentration, oxygen-bearing coal-bed methane (CBM, 30 vol % CH4) to electricity via solid oxide fuel cells (SOFCs). A fuel cell with the LiLaNi–Al2O3/Cu catalyst layer was developed, and a maximum power output of ∼1068 mW cm–2 was achieved at 850 °C using 30 vol % CBM fuel, which is only modestly lower than that from a cell based on hydrogen fuel. The stability test showed that the cell operation was quite stable during the 120-h test period, which is ∼40-fold longer than that of the cell without catalyst layer. The partial oxidation of methane (POM) occurring in the anode may play an important role when using 30 vol % CBM fuel, which not only supplies highly active gaseous fuels (H2 and CO) but also suppresses the carbon deposition on the anode. By modifying the anode with a LiLaNi–Al2O3/Cu catalyst layer, the POM of 30 vol % CBM was further promoted and the carbon deposition over the anode was mitigated more efficiently. Therefore, the strategy of direct conversion of low-concentration, oxygen-bearing CBM via the SOFCs with an anode catalyst layer may pave an alternative way to utilize this abundant resource efficiently and cleanly.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhiwei Zhao,Yuan Li,Yanjie Wang,Yating Wang,Yuhao Tang,Mengyue Lu,Xu Yang,Xiaoqing Wang,Feifei Zhang,Jinping Li,Jiangfeng Yang
The enrichment of low-concentration coal-bed methane is beneficial to solving the world’s energy concerns. However, most adsorbents used for CH 4 /N 2 separation from coal-bed methane are hydrophilic and ineffective under humid conditions. In this study, a hydrophobic nickel-based metal–organic framework (TUTQ-1Ni) was developed for efficient CH 4 /N 2 separation under humid conditions. Adsorption results show that, at 298 K and 1 bar, TUTQ-1Ni exhibits the highest CH 4 /N 2 selectivity (11.0) among the reported hydrophobic CH 4 -selective metal–organic frameworks. The results of theoretical calculations reveal that multiple O/S sites provide strong adsorption affinity for CH 4 over N 2 . Further, breakthrough experiments confirm the suitability of the material for CH 4 /N 2 separation, with the separation performance being maintained at even a high relative humidity of 100 %. The pressure swing adsorption simulation results indicate that TUTQ-1Ni is a potential candidate material for the selective capture of methane from coal-bed methane.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 9
·e17281
·
IF 3.993
Ze Dong,Bei Li,Hua Shang,Peixin Zhang,Shixia Chen,Jiangfeng Yang,Zheling Zeng,Jun Wang,Shuguang Deng
The adsorptive separation of CH 4 from low-grade coal-bed gas can be performed at decentralized and remote coal mines, and it uses more energy- and is cost-efficient than the traditional cryogenic distillation process. Herein, we present a facile method to prepare ultramicroporous carbon granules with a narrow pore-size distribution at 0.5–0.6 nm. To our knowledge, such centered and uniform pore-size distribution in carbon granules has never been reported. The carbon granules can be directly utilized in adsorption columns without a granulation or pelletization process. The granular oil-tea-shell-derived porous carbon (GOC-2) exhibited a record-high CH 4 uptake of 1.82 mmol/g and CH 4 /N 2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH 4 /N 2 separation performances were confirmed from the results of dynamic breakthrough experiments and pressure swing adsorption simulations. This work provides a novel strategy for developing ultramicroporous carbon granules and guides the future design of efficient CH 4 /N 2 separation adsorbents.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）