Science China-Chemistry
·
2026
·
IF 9.8
Zhong Fengyi,Sheng Jianping,He Ye,Du Chenyu,Ma Xiaodan,Moghadam Majid,Sun Yanjuan,Dong Fan
Under mild continuous-flow gas-solid conditions, the direct conversion of gaseous nitric oxide (NO) in flue gas to pure ammonia (NH 3 ) is hindered by the challenges of sustaining continuous proton-electron coupling and transfer. Here, we develop a PtO x -TiO 2 photocatalyst featuring ultrafine PtO x clusters that sustain continuous electron transfer via dynamic PtO x /PtO ( x−δ ) redox cycling. Upon illumination, PtO x continuously captures photogenerated electrons to form PtO ( x−δ ) and injects them into NO antibonding orbitals, while the PtO x -TiO 2 interface simultaneously drives H 2 O dissociation to provide a steady proton flux. This persistent electron-proton coupling orchestrated by PtO x /PtO ( x−δ ) cluster interface promotes exciton dissociation, interfacial charge separation, and stepwise hydrogenation of NO to NH 3 . Under continuous-flow conditions with 200 ppm NO, PtO x -TiO 2 achieves 76.0% NO conversion, 808.25 mmol m −2 h −1 NH 3 yield, and 98.1% selectivity, representing a 9.1-fold enhancement over pristine TiO 2 and representing the current best performance in the gas-solid phase NO reduction for NH 3 synthesis. In situ spectroscopy and density functional theory (DFT) calculations reveal that the exceptional activity mainly stems from the facilitated electron-proton coupled transfer via the unique role of PtO x /PtO ( x−δ ) cluster. This work establishes a practical strategy for sustainable NO abatement with green NH 3 production without separation in gas-solid systems.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Dajian Li,Alfin Kurniawan,Tania Roy,Jin Wang,Cheng lan Liu,Ze Zhen Wang,Rong Zhen Mu,Chun Hui Zhou
The efficient production of allyl alcohol from glycerol is of great importance due to its significance as a valuable intermediate in chemical industries. While catalytic conversion of glycerol to allyl alcohol by solid acid catalysts, carbon deposition (coking) is prone to occur on the catalyst surface, leading to slow down the conversion process and fast deactivation of the catalyst. In this study, we obtained an efficient catalyst for the preparation of allyl alcohol from gas-phase glycerol by controlling the pore structure and surface acidity of the catalyst. The characterization results showed that hydrochloric acid and citric acid removed the silicon and aluminium elements from montmorillonite, and the acidity, pore volume, and surface area ratio of Na-MMT (SBET=34.5 m2 g-1, VT=0.19 cm3 g-1) of the porous montmorillonite(HA1MMT) catalyst were all improved (SBET=97.9 m2 g-1, VT=0.28 cm3 g-1); After adding MoOx and VOx, the selectivity of Mo/V-HA1MMT catalyst for allyl alcohol was improved. The XPS characterization results indicate that the synergistic effect of Mo and V can promote the transfer of electrons during the reaction process of glycerol conversion. Within 480 minutes of catalyzing glycerol dehydration reaction, Mo0.6V0.4(5)-HA1MMT was almost deactivated (Conv.= 19.5%, Sel.allyl alcohol=31.2%) due to carbon deposition. When the catalyst was doped with calcium and magnesium components, a new active phase CaMo4 was discovered on the catalyst, and the acidity of Ca0.5Mg0.5-Cat. (Cat. is Mo0.6V0.4(5)-HA1MMT) decreased to 214.0 μmol g-1. The coking resistance performance of Ca0.5Mg0.5-Cat. was improved, and after 660 minutes of reaction, the catalyst was deactivated (Conv.= 32.1%, Sel.allyl alcohol=30.1%) due to carbon deposition. During the 3rd catalyst regeneration test, Ca0.5Mg0.5-Cat. still maintained high activity (Conv.= 63.3%, Sel.allyl alcohol=35.2%, Sel.acrolein=31.2%). The results of this study indicate that suitable pore structure and acidity are crucial for designing a catalyst with coking resistance properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Li Yuan,Xueqian Wang,Xiang Li,Jianhong Wang,Langlang Wang,Yiran Xiong,Yuhang Xiao,Ping Ning
The performance of FeOOH for the removal of hydrogen sulfide (H 2 S) has been widely investigated. However, the harsh conditions of use and the difficulty of regeneration limit its practical application. In this study, FeOOH was loaded on activated carbon (AC) by a hydrothermal method to obtain a series of XF-AC catalysts for the removal of H 2 S from blast furnace gas (BFG). Among these catalysts, 3F-AC exhibited a high penetrating sulfur capacity of 482.3 mg/g and good regeneration performance. It is noteworthy that the use of AC as the support induced the transformation of α-FeOOH crystals into amorphous FeOOH and affected their morphology, and uniformly dispersed nanoparticles rather than agglomerated acicular crystals appeared on the surface of AC. The presence of amorphous FeOOH modulated the basic sites and surface hydroxyl groups of the catalysts while generating hydroxyl radicals during the reaction, thus improving the adsorption and oxidation of H 2 S. More importantly, the structural properties (surface area and pore volume) of 3F-AC enhanced the storage capacity of elemental sulfur and reduced the formation of by-products. The cyclic catalytic role of Fe 3+ /Fe 2+ played an important role in the oxidation process. This work provides a simple and effective strategy for the design of BFG desulfurization catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jinju Ma,Yupeng Liu,Juan Xu,Youqing Chen,Lanxiang Liu,Hong Zhang
Fresh-cut products are extremely perishable due to the processing operations, and the atmosphere environment, especially CO 2 , O 2 and H 2 O, could profoundly affect their shelf life. Herein, an insect “lac blanket”-mimetic and facile strategy was proposed for fresh-cut vegetables preservation, employing porous shellac hydrogel microparticles as gas “switches” in chitosan film to regulate CO 2 , O 2 and H 2 O vapor permeability. Thus, the shellac hydrogel/chitosan hybrid film presented the controllable and wide range of gas permeability, compared with the chitosan film. The shellac-COOH nanoscale vesicles aggregated to form shellac hydrogel network via hydrophobic binding. The shellac hydrogel microparticles played a certain lubricating effect on the hybrid film casting solution. The hydrogen bond network between shellac hydrogel and chitosan contributed to the excellent mechanical properties of the hybrid film. The hybrid film also exhibited remarkable water-resistant, antifogging properties, optical transparency and degradability. The hybrid packaging films prepared through this strategy could adjust the internal gas (CO 2 , O 2 , H 2 O and ethylene) contents within the packages, and further exhibited admirable preservation performance on three fresh-cut vegetables with different respiratory metabolisms. This gas permeation-controlled strategy has great potential in fresh food preservation and various other applications that need a modified atmosphere.
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PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Mengqi Xu,Jun Li,Yanlan Bi,Jie Song,Chenyu Fu
A GC-MS method was investigated for simultaneous determination of TBHQ and its transformation products (TBBQ, MAHQ) in fats and oils. Three substances were determined with good linearity of 0.15–100.00 μg/mL (R 2 > 0.9982); low LODs (0.05, 0.17, and 0.10 μg/mL) and the LOQs (0.15, 0.52, and 0.30 μg/mL). The recoveries of the three substances ranged from 93.28 % to 104.64 %. The method is sensitive and reproducible and meets the requirements of the methodology. The initial addition of TBHQ can be assessed with a recovery of > 90 % based on three substances, and the recovery could be closer to the initial addition of TBHQ if more transformation productions of TBHQ were identified with further in-depth study in the future. Compared to reported HPLC methods, the method realizes accurate quantitative detection of TBHQ and its transformation products, which can address the discrepancies between upstream and downstream enterprises in the food industry regarding the amount of TBHQ addition. This method allows downstream companies to precisely control the addition level in order to meet the requirements (maximum of 200 mg/kg based on oil content) regulated by National Standards as well as provide theoretical support for the scientific understanding and application of TBHQ in food industry.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Zi-An Chen,Bingyu Zhao,Junhao Xin,Yaodong Liu
A novel mixing strategy for optimizing the structures and gas separation properties of carbon molecular sieve membranes (CMSMs) through the precise segment-level mixing of polyimide- co -siloxane (PSI) blends is proposed. PSI copolymers with different contents of siloxane were synthesized and blended, denoted as PSI-0, PSI-1, PSI-2, and PSI-3 based on the molar ratio of DABA:siloxane, 10:0, 9:1, 8:2, and 7:3, respectively. This study focuses on unraveling the intricate interplay between repeating segment distribution and resulting carbonization structures, with a specific emphasis on the gas separation performances of CMSMs. Of particular interest is the PSI-0:PSI-3 (1:2) blend, which, despite containing an identical siloxane amount to neat PSI-2, yields a CMSM with comparable hydrogen permeability and significantly enhanced selectivity (232 % H 2 /CH 4 and 184 % H 2 /N 2 selectivity). These findings underscore the critical role of segment distribution in achieving superior gas separation performances, presenting a promising avenue for the precise engineering of polymer precursor structures to optimize CMSM properties.
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RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2025
·Vol. 39
·期 10
·e10003
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IF 1.7
Xiaopeng Peng,Jianglong Du,Long Chen,Keqi Ye,Jiacheng Ye,Yinghua Yan,Chuan-Fan Ding
Rationale Dimethylbipyridine (DMDP) serves as a versatile industrial intermediate, with methyl substitutions at distinct positions tailored for varied applications, including the synthesis of DNA reagents and proton receptors. However, the pronounced structural and chemical similarities among its isomers underscore the critical need for an effective method to achieve their quantification and precise identification. Methods This study developed a straightforward, swift, and effective approach for the identification and quantification of two dimethylbipyridine positional isomers, namely, 6,6′-dimethyl-2,2′-bipyridine and 4,4′-dimethyl-2,2′-bipyridine based on the analysis of ion mobility spectrometry (IMS) of their cyclodextrin complex ion in gas phase. Moreover, their spatial conformations and cross sections were simulated by theoretical calculations. Results The complex associated with γ-CD exhibited superior separation, achieving an Rp-p of 0.823. And the theoretical computational simulation results are in good alignment with the experimental results, with a computed error value of less than 12.02%. Additionally, the relative quantification of the two DMDP isomers in a mixed solution was examined, yielding very well linear correlation coefficients ( R 2 > 0.99). Conclusion This study presents a highly promising method for the identification and quantification of two positional isomers of dimethylbipyridine (DMDP). Compared to conventional analytical methods such as HPLC, this approach offers advantages of simplicity, speed, and the elimination of chemical derivatization. It provides a novel perspective for the identification of DMDP isomers in chemical research and industrial applications.
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PubMed
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dong Wang,Huizhang Zhao,Haibo Yu,Yanan Chen,Xiao Ma,Eryang Shang,Hong Chen,Xingyu Kang,Jiawei Zhang,Rong Tan,Hairui Fang
Constructing heterostructures is an effective strategy to improve the performance of semiconductor metal oxide . The heterostructure exhibits strong interaction between tightly packed interfaces, showing better performance than a single structure. Therefore, indium sulfide (In 2 S 3 )/tungsten oxide (WO 3 ) composites were synthesized with heterojunction by a simple hydrothermal method to enhance the gas sensing performance of WO 3 . The WO 3 and In 2 S 3 exist in the form of nanoparticles . Then the gas sensing test of the material was carried out, by exploring the performance of WO 3 based on doping different amounts of In 2 S 3 , the response of WO 3 based on 3 wt% In 2 S 3 to 10 parts per million (ppm) nitrogen dioxide (NO 2 ) is 170.1 at the optimum operating temperature of 170 °C. Compared with pure WO 3 , the response is enhanced by seven times. Besides, the detection limit of the sample is low. The minimum detection concentration of NO 2 can reach 20 parts per billion (ppb). The reason for the improved performance can be attributed to the wider electron depletion layer or hole accumulation layer formed by the heterojunction for electron transfer . Finally, a convenient wearable NO 2 Real-time Detection System is designed to detect different concentrations of NO 2 in the factory, which provides an effective alarm mean for the excessive emission of industrial waste gas in the factory environment.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Suqi Liu,Xiaowei Wu,Shihao Chen,Cong Liu,Wanqi Zhang,Mingyi Yang,Jiyu Cheng,Guoquan Lu,Zhenhe Wang,Wei Chen,Yuge Guan,Linjiang Pang,Xinghua Lu
Linalool, a terpenoid alcohol with bacteriostatic properties, was detected in sweetpotato suffering from black spot disease. In this research, a composite material based on HKUST-1/MWCNT-gel@MIP was employed to detect the linalool content in these infected sweetpotatoes. The micro-morphology and crystal structure of the composite were characterized using scanning electron microscopy (SEM), fourier transform infrared (FTIR), and x-ray diffraction (XRD). Experimental results demonstrated that the quartz crystal microbalance (QCM) gas sensor of HKUST-1/MWCNT-gel@MIP composite exhibited high sensitivity (0.873 Hz/ppm), a low detection limit (0.237 ppm), a small standard deviation (0.83 %), good reproducibility, and outstanding selectivity. The QCM gas sensor data from actual samples showed a strong correlation with gas chromatography-mass spectrometry (GC–MS) results (r = −0.976, p < 0.01), demonstrating its exceptional ability to identify linalool. Thus, it can be used for early detection of sweetpotato black spot disease.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Cailing Gan,Kaikai Shen,Jiahe Nan,Kaixiang Xu,Lichao Yu,Xiaojun Shen,Jipeng Guan
In this study, the Janus nanosheets (JNSs) as compatibilizers have been applied in the immiscible polyamide 6/acrylonitrile-butadiene-styrene copolymer (PA6/ABS) blends. In the JNSs, polystyrene (PS) chains and epoxy groups were grafted on the opposite sides successfully where the epoxy functional groups can react with terminal carboxyl/amino groups of PA6 with ring-opening condensation reactions during melt blending. The obtained JNSs with grafting PS and PA6 chains on each side of silica nanosheets can gradually migrate toward and be anchored at the phase interface with amphiphilicity and the pickering effect. The JNSs exhibited higher interfacial selectivity and compatibilization efficiency. At 2.0 wt% JNSs loading, the ABS dispersed phase transformed from spherical to irregular ellipsoidal shapes, likely due to the rigid characteristics of JNSs altering phase interface curvature and consequently modifying the blend's phase morphology. The gas barrier properties of the blending films can be significantly enhanced from 3.10 × 10 −15 cm 3 cm·cm −2 s −1 Pa −1 to 1.70 × 10 −15 cm 3 cm·cm −2 s −1 Pa −1 with 2.0 wt% JNSs due to the irregular dispersed phase structure and the presence of silica nanosheets at the interface. This study investigates interfacial structure and mechanical properties with JNSs compatibilizers, providing new insights for interface compatibilization strategies and construction of functional composites.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Xiaoyun Wang,Keyi Wang,Xing Lv,Jiangwei Chen,Qingguo Li,Rizhi Chen,Huiqin Zhang,Yangming Cheng,Ting He,Zhaoliang Cui
The extracorporeal carbon dioxide removal (ECCO 2 R) system is a life-support technique that has been shown to facilitate a protective ventilation strategy. When the lung disease cannot remove carbon dioxide (CO 2 ) in time, resulting in CO 2 retention, ECCO 2 R is used to remove the excess CO 2 . As the key component of the artificial lung, the gas transport performance of the membrane determines the CO 2 removal capacity of the membrane lung, which should present high CO 2 selectivity to increase the efficient CO 2 removal rate. In this study, a biomimetic metalloenzyme, ZIF-8-NH 2 , was prepared to mimic the function of carbonic anhydrase (CA). The pore in ZIF-8-NH 2 was constructed to act as gas channel, in order to enhance the CO 2 /O 2 selectivity. ZIF-8-NH 2 /Pebax, which has functions similar to those of CA and gas channel (AQP1), was coated on the surface of poly(4-methyl-1-pentene) (PMP) membranes to fabricate the composite membrane. The results confirmed that the CO 2 /O 2 selectivity of the ZIF-8-NH 2 /Pebax composite membrane was 7.4, which was 7.5 times higher than that of the pristine PMP membrane (1.0). The protein adsorption and thrombin time were 35.5 % lower and 34.4 % higher than those of PMP hollow fiber membrane (44.9 μg/cm 2 and 27.6 s), respectively. These results demonstrated that the prepared composite membrane possessed good blood compatibility. Additionally, an in-vitro blood circulation device was established to comparatively evaluate the hemocompatibility and CO 2 removal efficiency of PMP and the composite membrane modules under dynamic blood flow. Meanwhile, the corresponding results exhibited that the modified coating has good biosafety, implying that the mentioned materials can be safely applied in clinical trials.
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高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Xiaohui Xue,Tuanwei Xu,Bozhi Hu,Wenke Zhang,Jianzhong Liu
In this study, the agglomeration behavior, gaseous combustion products flow velocity and characteristics of condensed combustion products (CCPs) from a HTPB-based solid propellant were systematically investigated under low-pressure and low-temperature conditions. Furthermore, the underlying mechanisms of these environmental effects were discussed. High-speed microscopic imaging was employed to observe and quantify the agglomeration behavior near the burning surface. Meanwhile, the gaseous combustion product stream velocity in this region was analyzed using both kinetic modeling and theoretical calculations. Experimental results show that when pressure decreases from 1 atm to 0.5 atm, the agglomerate occurrence frequency drops by 90.2 %, the average particle size increases by 14.4 %, and the gaseous product velocity rises by 52.1 %. When reducing the ambient temperature from 20 °C to −40 °C leads to an 18.1 % decrease in agglomerate frequency and a 6.5 % reduction in average particle size, while its effect on gaseous velocity remains inconclusive. Characterization of CCPs reveals that both low pressure and low temperature significantly alter the particle size distribution and reduce the combustion efficiency of solid propellants. Within the experimental conditions of this study (0.3 atm to 1 atm, −40 °C to 20 °C), the impact of pressure changes is greater than that of temperature.
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