INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Zhenxing Cai,Haiyan Chang
This paper proposes a novel falling film crystallizer equipped with sieve baffles. Unlike traditional smooth cylindrical tubes, its crystallization unit is replaced with rectangular tubes containing perforated metal plates. This new design prevents crystals from detaching from the tube walls and enhances mass transfer during the crystallization process. A mathematical model for heat and mass transfer in the crystallization unit, along with a corresponding numerical solution, was developed, considering the baffle structure and the amount of crystal formation on the plates. A series of experiments were conducted under different feed and coolant conditions to validate the proposed model, showing good agreement between predicted and experimental results. Additionally, the effects of operation time, coolant inlet temperature, coolant mass flow rate, and the number of baffles on the economic benefits of an industrial-scale crystallizer were investigated.
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BIOMASS & BIOENERGY
·
2026
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IF 7
Ge-liang Xie,Yu Luo,Kai-cheng Xia,Sheng-ren Li,Lujiang Xu,Zhen Fang
Aromatic amines, particularly aniline derivatives, serve as pivotal intermediates in the manufacture of dyes, pharmaceuticals, and polymers. However, their conventional synthesis remains heavily reliant on fossil feedstocks and frequently employs toxic reagents. The valorization of lignin presents a promising, renewable pathway to these valuable compounds, yet the reactivity of lignin-derived phenols varies markedly depending on their functional group substituents. Herein, a pronounced "promotion-inhibition dichotomy" is reported. Alkyl substituents substantially enhance reactivity-achieving a 44.3 mol% yield of aromatic amines from 4-propylphenol, representing a 34.7% increase over phenol. Conversely, methoxy groups exert a strong inhibitory effect in limiting the yield of aromatic amines from 4-propylguaiacol to only 11.0 mol%. Furthermore, Mo-Ga/HZSM-5 catalyst employed under NH 3 -H 2 atmosphere effectively doubled the yield of aromatic amines to 25.9 mol%. A sequential hydrodeoxygenation-amination strategy is further devised, boosting the yield to 34.1 mol%. Notably, by integrating this two-step strategy with a lignin-first biorefining approach, a 16.6 mol% of aromatic amines (based on lignin) could be achieved from birch. This study elucidates key reactivity principles in lignin valorization and demonstrates an integrated strategy that advances the sustainable production of aromatic amines from renewable biomass.
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Analytical Methods
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2026
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IF 3
Xingyun Zhao,Jiangyan Jin,Peng Wang,Yonghao Chai,Kairui Zhu,Liyun Zhang,Ruifang Wang,Ke Li,Rongfang Wu
Specifically, the oxidation of imine linked TAPT-TA-COF@SiO2 was prepared using 2,4,6-tris (4-aminophenyl-1,3,5-thiazine (TAPT) and 1,4-benzenedicarboxaldehyde (TA) as monomers through one pot cascade polymerization reaction on the surface of silica spheres, was carried out with high yield and specificity. Notably, its BET specific surface area and the pore size distribution of the spheres retained mesoporous similarly to the original porous silica microspheres obtained in this work. Chromatographic performance and multiple retention mechanisms were investigated, demonstrating efficient separation of neutral polar solutes and nonpolar compounds in reverse-phase chromatography mode than that achieved with the unmodified COF. Moreover, an improved separation method was established for representative saccharides and complex oligosaccharide samples confirmed that the post-modification amide TAPT-TA-COF@SiO2 based core-shell stationary phases were hydrophilic than imine-linked TAPT-TA-COF@SiO2 materials. These findings provide new opportunities for advancing the understanding of COF as HILIC stationary phases for separations, contributing to the application of COF in separation science.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 28
·12821-12832
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IF 7.6
Chen Yuhan,Xie Haiyang,Wu Yubo,Luo Jiangxue,Zhan Tianren,Zhang Yanjuan,Huang Zuqiang,Hu Huayu,Gan Tao
Developing highly efficient Fe-based single-atom catalysts (SACs) for the selective oxidation of C–H bonds to produce value-added aromatic ketones under mild conditions is still challenging. Herein, the construction of amphiphilic Fe SACs with electron-deficient Fe–S 2 O 2 structure supported on porous S-doped lignin-derived carbon (Fe 1 /SLC) was achieved using a ball milling combined with an impregnation method. Due to the synergistic interaction between electron-deficient Fe–S 2 O 2 sites and ethylbenzene (EB)–water microinterfacial effects, Fe 1 /SLC markedly enhanced the catalytic activity and acetophenone (AP) selectivity for the selective oxidation of EB to AP under 60 ° C for 12 h, obtaining an AP selectivity of 99.1% at 99.0% EB conversion and a high turnover frequency (TOF) of 2422.3 mmol EB g Fe –1 h –1 , which were much higher than those of the control catalyts (Fe 1 /LC and Fe NPs /SLC), surpassing most reported catalysts in similar reaction system. The electron-deficient Fe–S 2 O 2 sites were conducive to the cleavage of TBHP to generate 1 O 2 , • O 2 – , and • OH radicals, wherein • O 2 – was dominant, while 1 O 2 and • OH performed a secondary role. Meanwhile, the density functional theory calculations revealed that the amphiphilic property of Fe 1 /SLC induced by the C–SO x –C structure heightened the catalytic activity and AP selectivity, which originated from the unique interfacial hydrogen-bonding interactions and adsorption energy gradients. Furthermore, Fe 1 /SLC showed excellent recyclability, long-term storage stability, and satisfactory universality. This work provides a promising strategy to simultaneously improve the catalytic activity and aromatic ketones selectivity of the selective oxidation of C–H bonds.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122374
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IF 7.5
Feng Chen,Xiang Xia,Wei Chen,Wei Liu,Xinxin Liao,Lei Xiong,Yanqiao Jin
Refining lignin and its derivatives into biofuels and fine chemicals via catalytic transfer hydrogenation (CTH) has gained significant attention for its potential in utilizing renewable resources and reducing fossil fuel dependence. Herein, a series of bimetallic Cu-Co catalysts with varying metal ratios are synthesized via a facile hydrothermal method and successfully applied in the efficient CTH of the α-O−4 model compound benzyl phenyl ether (BPE) and corncob lignin. Cu 0.5 Co 1 @CN has the best performance among catalysts with different CuCo ratios due to the formation of the CuCo 2 O 4 phase which provides more acid sites and hydrogen adsorption/desorption sites. Under the reaction conditions of 190 °C in isopropanol, the Cu 0.5 Co 1 @CN catalyst achieves the complete conversion of BPE to cyclohexanol and toluene, and demonstrates excellent CTH performance towards other α-O−4 and β-O−4 model compounds. This catalyst simultaneously enables the demethoxylation and hydrogenation of phenolic compounds like guaiacol. Furthermore, Cu 0.5 Co 1 @CN efficiently converts corncob lignin, producing a high proportion of phenolic compounds in the resulting liquid (88.26%), while preventing the aromatic hydrocarbons from being hydrogenated. Overall, this work provides a novel and effective strategy for transforming lignin into high-value products.
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JOURNAL OF POROUS MATERIALS
·
2025
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IF 3.2
Ding Yunlong,Wang Jiayin,Zhang Yanting,Pu Yongzhi,Hou Nan,Li Ning,Song Jinrui,Liang Yaning,Li Xiaofeng
This study aimed to synthesize a novel mesoporous template agent, KHBA, using 3-glycidoxypropyltrimethoxysilane (KH-560) and butylamine as raw materials, and to explore its application in the synthesis of ZSM-5 zeolites with nanocrystal aggregates. The physical and chemical properties of the synthesized ZSM-5 zeolites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG), and low-temperature N 2 adsorption–desorption The results showed that the introduction of KHBA effectively inhibited excessive crystal growth and promoted the formation of nanocrystal aggregates with a mesoporous structure. In the synthesis system with a KHBA-to-Al 2 O 3 molar ratio ranging from 1.6 to 4.8, the external surface area and mesoporous volume of the samples increased with increasing KHBA content. The sample synthesized with a KHBA-to-Al 2 O 3 molar ratio of 4.8 exhibited the highest external surface area (250.43 m 2 /g) and mesoporous volume (0.24 cm 3 /g). In the catalytic performance test for C8 aromatic hydrocarbon isomerization, the catalyst prepared with a KHBA-to-Al 2 O 3 molar ratio of 4.8 demonstrated the best performance, with isomerization activity of 23.79%, ethylbenzene conversion of 88.94%, and xylene loss of 3.42%. These findings highlight the potential of KHBA as an effective template agent for the synthesis of high-performance ZSM-5 zeolites in catalytic applications.
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ARCHIVES OF MICROBIOLOGY
·
2026
·Vol. 208
·期 5
·235
·
IF 3.4
Zhou Yong,Wu Lei,Rubo Lv,Szpyrka Ewa,Podbielska Magdalena,Amirian Veghar,Russel Mohammad
This study investigated the aerobic biodegradation potential of two novel indigenous bacterial strains, Pseudomonas aeruginosa DUT-Pa and Rhodococcus erythropolis DUT-Re, utilizing benzene, toluene, ethylbenzene, and o-xylene (BTEX) as the sole carbon source. The optimal metabolic activity for both strains was identified at neutral pH (7.0) and mesophilic conditions (30 °C), establishing a critical baseline for enhancing bioremediation protocols. Biochemical oxygen demand (BOD) analysis revealed a direct correlation between the substrate concentration (up to 400 mg/L) and microbial respiratory activity. Dissolved oxygen (DO) depletion from 7.77 mg/L (pre-experiment) to 2.97 mg/L (DUT-Pa) and 2.15 mg/L (DUT-Re) further confirmed the oxygen-dependent degradation. In the gas phase, the highest degradation rate was recorded for benzene, with 98.43, 97.34, and 98.91% by DUT-Pa, DUT-Re, and mixed bacteria, respectively. Meanwhile, the liquid phase demonstrated superior toluene degradation efficiency by DUT-Pa, DUT-Re, and mixed bacteria with 91.99, 83.54, and 93.27% respectively. Bacterial combinations enhanced BTEX degradation, achieving the shortest half-lives and the highest degradation rate constants. Meanwhile, the SOD (325 U/mL) level and MDA (1.5 to 2.59 nmol/g) increased in the mixed system. This study demonstrates that an additive effect of DUT-Pa and DUT-Re combination promotes efficient, complete degradation of BTEX and offers a scalable, eco-friendly solution based on strain-specific cooperative microbial dynamics. Graphical
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Zhihui Liu,Siyuan Sun,Fan Yang,Hongchen Liu,Yang Sun,Na Ta,Ge Zhang,Sai Che,Yongfeng Li
Transition metal-based (Fe, Co, Cu, etc.) single-atom catalysts (SAC) have been widely used in the direct oxidation of ethylbenzene and benzene. However, their catalytic performance is limited by the low metal loading. Compared with traditional SAC, dual site single-atom catalysts (DSAC) show the advantages of abundant active sites, high metal loading, and excellent catalytic performance. Herein, a novel Fe/Cu N C DSAC was prepared by facile one-pot pyrolysis of formaldehyde, dicyandiamide, and metal salts. Dicyandiamide acted as the carbon source with advantage of high nitrogen content, which promoted the formation of metal centers and increased the metal loading. Meanwhile, the synergistic effect between Fe and Cu active centers was revealed to adjust the coordination environment, thus improving the catalytic activity of oxygen activation. The synthesized Fe/Cu N C DSAC demonstrated superior catalytic performance in ethylbenzene oxidation reaction with O 2 as a green oxidant under mild reaction conditions, with a 99 % conversion of acetophenone and no significant degradation of activity after 10 circles. In addition, NaCl was added into the synthesis as a template to adjust the pore structure, and the modified Fe/Cu N C DSAC showed excellent performance in benzene oxidation reaction with high product conversion. In conclusion, this work paves the way for the construction of efficient, green, and cost-effective catalysts for the direct oxidation of ethylbenzene and benzene.
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Meijun Wan,Yunchao Zheng,Xuemei Dai,Honglin Yang,Jingqiu Zhou,Jing Ou,Yaxin Yang,Meifang Liao,Zhining Xia,Lujun Wang
Covalent organic framework (COF) as a kind of crystalline porous material possesses intriguing advantages, including low density, large surface area, permanent porosity, and excellent chemical stability. This novel material has shown great potential in the development of chromatographic stationary-phase materials. In this work, a room-temperature solvothermal method was utilized to yield a uniformly spherical COF-modified silica named Sil-COF. Then, the thiol-ene click chemistry was further used to modify thiolated β-cyclodextrin on the spherical Sil-COF composite for chiral separation called Sil-COF-CD. A series of characterization methods were performed to identify the successful construction of COF-modified stationary-phase materials. Then, three types of nonpolar substances realized baseline separation on the Sil-COF column. In addition, 2-phenylpropionic acid and 1-phenyl-1-propanol were selected as model enantiomers to identify the chiral recognition capability of the Sil-COF-CD column. Sil-COF and commercial β-CD columns were compared to further confirm the superiority of the prepared chiral column. In addition, both COF-modified columns possessed good repeatability. The results open a new avenue to apply spherical chiral COF for the preparation of the HPLC stationary phase.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 9
·24470-24478
·
IF 5.19
Ma Ge,Xiao Han,Wei Xinming,Xiao Anshan,Sun Xiaoying,Gao Xiang
Oil leakage from water coolers in refinery circulating water occurs from time to time, which affects the long-term and stable operation of refinery units. So far, workers in the refineries still adopt manual check methods, opening water coolers one by one and checking the water’s smell and color to find out the spilled water coolers. In this study, a more rapid method of source appointment of oil spill in the circulating water by combining chemical fingerprinting with model recognition was developed. Firstly, chemical fingerprints including benzene/naphthalene series, and light hydrocarbon (C 3 -C 5 ) in oil samples from all water coolers in the refinery fluid catalytic cracking (FCC) unit were analyzed by gas chromatography-mass spectrometry (GC/MS). Gasoline, diesel, and poor oil could be distinguished in terms of benzene and naphthalene distribution. The three similar types of gasolines could be distinguished by the volatile hydrocarbons especially C 3 -C 4 . The classification model for the spill of gasoline, diesel, and poor oil in circulating water was constructed by the partial least squares discriminant analysis algorithm with a 100% correct classification rate at the concentration more than 10 ppm. The gasoline spills in the circulating backwater of the refinery were successfully recognized by the classification model. This method enables the rapid prediction of oil spill type in refinery circulating water, and a similar method by installing online instrument and software potentially can be used for monitoring the circulating water in real time.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Pan Cheng,Cancan Ji,Wei Hu,Peng Huang,Qihao Guo,Ming Xia,Qin Cheng,Jia Xu,Ke Liu,Dong Wang
Construction of ion-exchange chromatography membrane with appropriate pore size and high-density ligands is essential to improve its working efficiency and service life for the separation and purification of biomacromolecules such as RNA . Herein, surface aminated ethylene vinyl alcohol copolymer (EVOH) ion-exchange chromatography nanofibrous membrane (PEI-NFM) with 0.7 µm pore size was fabricated by sea-island spinning and in situ crosslinking (EVOH nanofibers reacted with glutaraldehyde (GA) and polyethyleneimine (PEI) in dispersion). Morphological and chemical characterization of PEI-NFM indicated that GA and PEI crosslinked on the surface of nanofibers uniformly. Benefiting from the 3D network scaffold structure stacked by nanofibers and high-density amine groups, PEI-NFM exhibits high saturated capacity toward RNA (191.16 mg/g), and still possesses more than 93% of its initial adsorption capacity after ten times cyclic adsorption-elution. Moreover, PEI-NFM packed syringe-driven filter shows high water flux of 10.38 L/h at 0.1 MPa and a high dynamic adsorption performance toward RNA (144.07 mg/g at 1 mm/min). Besides, PEI-NFM exhibits high-recognition binding property toward RNA mixed with other biomacromolecules by adjusting pH of mixed solution to make other biomacromolecules positively charged. This work provides a facile strategy for the preparation of high performance and long service life ion-exchange chromatography membrane.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yuemiao Lai,Zhengtian Pu,Peng Liu,Fangliang Li,Jie Zeng,Xueming Yang,Qing Guo
The low-temperature C–H bond activation of alkanes remains a big challenge in alkane dehydrogenation. In this work, ethylbenzene (EB) oxidative dehydrogenation has been investigated on rutile(R)-TiO2(110) under both ultrahigh vacuum (UHV) and ambient conditions. Under UHV conditions, styrene is produced with nearly 100% selectivity in a stepwise manner, in which the first C–H bond dissociation of EB occurs at <285 K with the help of surface O22– species, followed by the second C–H bond dissociation at about 400 K. However, styrene, acetophenone, and 2,3-diphenylbutane products are produced from EB oxidative dehydrogenation under ambient conditions, suggesting that α-H dissociation is the initial step of EB oxidative dehydrogenation. This may be also possible for EB oxidative dehydrogenation on R-TiO2(110) under UHV conditions. The different pathways of EB oxidative dehydrogenation under UHV and ambient conditions may originate from different intermediates and O2 concentrations. This work provides new insight into the fundamental understandings of the low-temperature C–H bond activation of alkyl chains of aromatic hydrocarbons, which may promote the development of new catalysts for efficient styrene production from EB oxidative dehydrogenation under mild conditions.
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