JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Shu-Ting Hu,Yue-Lun Wang,Qing-Gang Wang,Han-Bing Gao,Wen-Jie Gu,Wei-Hua Zhao,Yun-Peng Zhao,Jing-Pei Cao,Lin-Jun Zhu
The introduction of in situ hydrogen donors to obtain a high H/C eff ratio is an effective way to upgrade coal pyrolysis volatiles to light aromatics. In this study, the influence of different in-situ hydrogen suppliers in catalytic reforming of coal pyrolysis vapors was explored. The abilities of active hydrogen donation were greatly corresponded to structures of hydrogen donors. Isopropanol showed the best catalytic performance due to the release of a large amount of active α-H as a result of negative inductive effect of hydroxyl. Whereas tertbutanol showed the poorest catalytic performance owing to the lack of α-H. Meanwhile, the effect of in-situ hydrogen production via steam reforming with different alcohols on light aromatic yields was investigated. The highest BTEXN yield was obtained under in-situ hydrogen production from isopropanol steam reforming. Two circumstances of hydrogen supply were further compared. Relatively higher BTEXN yield was presented in the reaction of methanol steam reforming than that of using methanol solely. However, higher BTEXN yield was contrarily obtained from sole isopropanol as a hydrogen donor despite lower H 2 production was gained compared to the case of isopropanol steam reforming. The fact was probably ascribed that high electron-withdrawing effect of hydroxyl for isopropanol promoted the cleavage of α-C-H bond and favored the transfer of active hydrogen to reactants over acid sites.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Lei Chen,Wenjie Yao,Xu Chen,Gang Yang
The Cu-Ce modified SAPO-34/ZSM-5 (S-Z) composite molecular sieve catalysts were synthesized via a stepwise crystallization process using triethylamine (TEA) and tetraethylammonium hydroxide (TEAOH) as dual templates. This method significantly reduces the crystallization time from 24 hours to 12 hours. The incorporation of metal ions alters the structure and acid strength of the molecular sieves, thereby decreasing the rate of coke formation during the reaction, which in turn extends the catalyst's lifetime. Experimental results demonstrated that the catalyst's lifetime increased progressively with the addition of Ce. In the methanol-to-olefin reaction, the catalytic lifetime of the S-Z/Cu 0.05 -Ce 0.05 samples reached 1440 mins, approximately 480 mins longer than that of the S-Z samples, while maintaining a selectivity for low-carbon olefins at around 89.6%.
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Heliyon
·
2022
·
IF 3.776
Onyinyechi Lydia Ugorji,Ogochukwu Ngozi Chidimma Umeh,Chukwuma Obumneme Agubata,Dickson Adah,Nicholas Chinedu Obitte,Amarauche Chukwu
The formulation of niosomes is influenced by a number of variables, and these variables may eventually affect the formulation’s outcome. One of the elements that can influence the physico-chemical properties of niosomes is the method used in preparation of the formulation. In this study, we established if various methods of preparation have any impact on the prepared vesicles when loaded with 5-fluorouracil. Thereafter, a real-time cell assay (an in vitro cytotoxicity test) against HCT-116 colon cancer cell lines was done on an optimised batch. 5-fluorouracil loaded niosomes were prepared with either Tween 60 or Span 60 by four different methods - namely thin film hydration (TFH), reverse phase evaporation (RPE), evaporation/sonication (EVP/SON), and the ethanol injection method (EIM). In vitro evaluations were done on the formulations, and these included particle size analysis, entrapment efficiency, scanning electron microscopy (SEM), photomicrography, drug release, polydispersity index, and Fourier transform infrared spectroscopy (FTIR). The effects of the preparation method and type of non-ionic surfactants on encapsulation efficiency, particle size, and in vitro drug release of the niosomes at pH 7.4 were evaluated. An in vitro cytotoxicity test (real time cell assay (RTCA)) against HCT-116 cells was carried out using the optimised formulation. Results showed physically stable formulations. The TFH method produced the smallest particle sizes (187 nm and 482 nm), while the EVP/SON method produced the largest particle sizes (4476 nm and 9111 nm). The Tween-based niosomes prepared by TFH or RPE had higher drug entrapment. The FTIR studies of niosomal formulations showed broad peaks at wavenumbers above 3000 cm −1 , indicating strong hydrogen bonds. The RTCA showed 5-fluorouracil-loaded niosomes caused more sustained cell death compared to the pure drug and blank niosomes. The methods of preparation affected the particle size, polydispersity index, entrapment efficiency, and the physical stability of the vesicles. The thin film hydration method was more robust in the entrapped 5-fluorouracil and showed lower particle sizes when compared to all the other methods. RTCA showed sustained cell death in real time.
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PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Binbin Chen,Hong Tian,Zhen Zhou,Yanni Xuan,Zhijie Wang,Siying Liu
A combined pretreatment of straw was carried out using acid washing and torrefaction methods. Metal-modified HZSM-5 core–shell molecular sieves were prepared by loading Zn (2, 4, and 6 wt%) and Ni (6, 8, and 10 wt%) on HZSM-5 molecular sieves and introducing MCM-41 core–shell structure. PY-GC/MS and a tubular furnace were employed to study the effects of pretreatment conditions and catalysts on the product composition distribution during wheat straw catalytic pyrolysis. XRD, SEM, BET, TPD and ICP were used to characterize the catalyst performance. It was found that the combined acid washing and torrefaction pretreatment reduced the oxygenated compounds in the bio-oil from straw catalytic pyrolysis and increased the bio-oil yield to 29.37 %. The incorporation of modified catalysts promoted the deoxygenation, zwitterionization and aromatization reactions during the straw-catalyzed pyrolysis. The monometallic loading of 4%Zn/HZ and 8%Ni/HZ catalyzed acid washing and torrefaction straw pyrolysis resulted in 54.2 % and 57.06 % yields of MAHs and 42.86 % and 38.58 % yields of BTX in bio-oil, respectively.Compared with the monometallic loading, 4%Zn8%Ni/HZ further optimized the bio-oil compositional distribution, with a MAHs yield of 64.76 %, a BTX yield of 54.69 %, and a deoxygenation performance of 81.34%.MCM-41-coated HZSM-5 produces a large mesoporous structure with channels with sufficient transport capacity, accelerating the cleavage of various types of oxygen-containing compounds in the bio-oil into smaller molecules for better conversion into aromatics. The 4%Zn8%Ni/H@M catalyst achieved a MAHs yield of 72.68 % and BTX yield of 63.43 % in the bio-oil during pyrolysis of acid-washed and torrefied wheat straw, with oxygen removal efficiency reaching 85.37 %. Therefore, the combination of feedstock pretreatment and metal-modified core–shell HZSM-5 molecular sieve could synergistically optimize both compositional distribution and production yield of bio-oil derived from biomass pyrolysis.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Huidong Zheng,Xiheng Luo,Guanghua Yin,Jingjing Chen,Suying Zhao
The saturated vapor pressures of furfural (FUR), 2-acetylfuran (2AF), and 5-methylfurfural (5MF) and the isobaric vapor–liquid equilibrium (VLE) data for three binary systems (FUR + 2AF, FUR + 5MF, and 2AF + 5MF) at 3.60 and 5.18 kPa were experimentally measured in a Rose–Williams still. The saturated vapor pressures were correlated by the Antoine equation; the binary VLE data were correlated by the nonrandom two-liquid, Wilson, and universal quasichemical models. The VLE of the ternary system of FUR + 2AF + 5MF was predicted by the obtained binary interaction parameters for each model, and the predictions fit well with the experimental data.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 33
·期 1
·125-130
·
IF 1.04
Ting Zhou,Hao Yu,Mingqiang Liu,Ying-Wei Yang
Carboxylated pillar[5]arene (CP5) macrocycles were modified onto the surface of reduced graphene oxide (RGO) via covalent bonds to form new pillarene-functionalized RGO nanosheets, i.e. , RGO-CP5. The obtained RGO-CP5 nanosheets capable of molecular recognition exhibited much better water-dispersibility and enhanced fluorescence-quenching property as compared with native RGO. This new sensing platform holds great potentials in the sensing and detection of analytes, such as organic dye molecules and pesticides, in aqueous solutions.
研究领域:
分析化学
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纳米材料科学
·
传感器技术
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环境监测
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分子识别
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POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2025
·
IF 6.8
Siyu Chen,Yiwen Zhang,Shuang Liu,Juan Ma,Huiling Wang,Wei Chang,Hengfeng Li,Xiaochun Ding,Xuejun Pan,Xuewu Duan
DNA methylation is a key epigenetic regulator of gene expression, yet its role in pigment and ascorbic acid (AsA) metabolism in Rosa roxburghii remains unclear. This study examined the effects of 5-azacytidine (5-azaC), a DNA methyltransferase inhibitor, on postharvest fruit quality after cold storage. 5-azaC treatment reduced decay, delayed the onset of color change, preserved overall fruit brightness, maintained firmness, and suppressed respiration during cold storage. It inhibited chlorophyll a degradation and enhanced zeaxanthin, lutein, α-carotene, phytoene, and violaxanthin levels. 5-azaC enhanced AsA content, accompanied by increased activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), ascorbate oxidase (AO), and ascorbate peroxidase (APX). Integrated RNA-seq and WGBS analysis showed that 5-azaC induced carotenoid biosynthesis genes ( RrBCH, RrVDE, RrNSY, RrDXS and RrZE P), with RrVDE hypomethylated. RrMDHAR, RrDHAR, RrAO1, RrGR, RrGALUR, RrGalDH and RrIMPL2 were upregulated by 5-azaC, with reduced DNA methylation levels observed in RrAO1, RrGalDH and RrIMPL2 . Transcription factors RrAP2, RrMYB21, RrMYB44 and RrPosF21-like were induced by 5-azaC, with RrMYB21 hypomethylated. DNA demethylases ( RrROS1 and RrROS1-like ) were upregulated, while methyltransferases ( RrCMT-like, RrMET, RrMDR2 and RrDMR2-like ) were downregulated. Silencing RrAP2, RrMYB21, RrMYB44, RrPosF21-like and RrROS1-like reduced AsA content and downregulated AsA metabolism-related genes in R. roxburghii fruit . These findings provide preliminary evidence that 5-azaC may regulate pigment and AsA metabolism via epigenetic mechanisms during cold storage.
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FLUID PHASE EQUILIBRIA
·
2026
·
IF 2.7
Shuo Wang,Jingjing Zhou,Jingjian Li,Yanmin Song,Bowen Zhang,Dandan Han,Junbo Gong
As a key intermediate in the synthesis of anticancer agents, 5′-O-Dimethoxytrityl-N-benzoyl-deoxycytidine (Bz-Dmt-dC) usually presents as a solvate and its purity plays a critical role in the production process. To obtain high purity products quickly and efficiently via crystallization, the solubility data of the compound must first be determined. Therefore, under the premise of ensuring no phase transitions during the measurement process, the solubility of solvates formed by Bz-Dmt-dC in three binary solvent systems (acetonitrile + water, acetone + water, and THF + water) were experimentally determined over the temperature range of 278.15 to 313.15 K at atmospheric pressure using the gravimetric method. The experimental results showed that, for a given solvent type and composition, the solubility of Bz-Dmt-dC increased with increasing temperature. The solubility data of Bz-Dmt-dC were correlated using the modified Apelblat, λ h, and NRTL equations. Among these, the modified Apelblat model provided the best fitting result, as indicated by the lowest average relative deviation (ARD) values of 0.7%.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2021
·
IF 5.541
Xiaohua Li,Jinlong Yan,Shanshan Shao,Shengnan Ge,Zhichao Lv,Yixi Cai
A method of template removal by direct non-thermal plasma (DNTP) system for the synthesis of HZSM-5/MCM-41 meso-micropore composite catalyst was proposed for the production of aromatic hydrocarbons by catalytic pyrolysis of rape straw. It was revealed most of the template on the catalyst was removed by oxidizing substances such as ozone produced by DNTP. During DNTP treatment, the removal effect of the template was greatly affected by the oxygen flow rate . Also, the catalyst structure was bombarded by high-energy electrons obtained by DNTP treatment, and the physicochemical property of the synthetic composite catalysts was treated quite different from that obtained by calcination method. Under the treatment condition of 22 kV-2 L/min, the BET surface area was boosted significantly by 29.91% and the amount of acid sites was boosted by 37.71%, the yield of MAHs reached 10.57 wt%. Generally, not only the template can be effectively removed by DNTP treatment, but also the physicochemical property of meso-micropore composite catalyst can be improved, and thus promoted the catalytic performance for monocyclic aromatic hydrocarbons. Therefore, DNTP is an effective technology for removing template and the catalytic performance can be efficiently improved.
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高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 44
·期 1
·237-246
·
IF 4.097
Ying Liu,Lining Sun,Jinliang Liu,Yu-Xin Peng,Xiaoqian Ge,Liyi Shi,Wei Huang
A novel mesoporous nanosphere functionalized with 3-(aminopropyl)triethoxysilane (APTES) and 2-(5-bromothiophen)imidazo[4,5-f][1,10]phenanthroline (5-Br-Tip) was synthesized (denoted as Tip-MSS). With the coordinating function of the 5-Br-Tip to lanthanide (Ln) ions, for the first time, LnL3(5-Br-Tip) complexes were linked to the mesoporous nanospheres. The derived materials, named Ln-Tip-MSS (Ln = Eu, Tb, Sm, Nd, Yb), were characterized by Fourier-transform infrared (FT-IR) spectroscopy, TEM, XRD (wide-angle and small-angle), N2 adsorption/desorption analysis, and fluorescence spectroscopy. Upon excitation in the ligand absorption, the Ln-Tip-MSS nanomaterials show characteristic visible (Eu, Tb, Sm) and NIR (Sm, Nd, Yb) luminescence (multicolor emission covered from 450 nm to 1400 nm spectral region). Of importance is that, with low cytotoxicity and good biocompatibility given by the methyl thiazolyl tetrazolium (MTT) assay, the Eu-Tip-MSS was successfully applied to cell imaging in vitro based on the Eu3+ luminescence (under 405 nm excitation).
研究领域:
纳米医学
·
生物成像
·
材料科学
·
分子探针
·
化学生物学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Hongyu Ding,Yujie Yang,Zhihao Geng,Tan Hu,Shaofan Ge,Ying Tang,Xiyan Wang
The development of high-performance microwave absorbing materials for extreme environments remains a significant challenge. In this work, the microwave absorption properties of a FeCoNiCrMn high-entropy alloy (HEA) were successfully modulated through an MgO doping strategy. A series of FeCoNiCrMn-based composites with MgO doping concentrations of 0, 1, 3, and 5 wt.% were fabricated, followed by annealing at 600 °C for 60 min in a nitrogen atmosphere. Electromagnetic characterization revealed that the doping level plays a critical role in determining the absorption performance. The composite with 3 wt.% MgO exhibited the optimal performance, achieving a minimum reflection loss ( RLₘᵢₙ ) of -55.02 dB and an effective absorption bandwidth ( EAB max ) of 4.4 GHz, while the sample with 1 wt.% MgO also demonstrated excellent absorption properties. Furthermore, the annealing temperature was confirmed to be another critical parameter, as the absorption properties of samples annealed at 500, 550, 650, and 700 ℃ exhibited markedly weaker absorption performance than those annealed at 600 °C. The optimal performance arises from the coupled effect of MgO doping and annealing at 600 °C. This processing window optimizes interfacial polarization and the defect/strain state of the HEA matrix, thereby achieving a favorable balance between impedance matching and attenuation. Beyond presenting a promising HEA-based absorber, this work elucidates the critical synergy between doping and thermal processing in tailoring electromagnetic properties. The understanding of this interplay ultimately provides new insights for designing high-performance microwave-absorbing materials.
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高影响因子
Food Bioscience
·
2026
·
IF 6.2
Wenhui Fu,Xuemeng Ji,Dongze Qin,Lingda Zhao,Huan Lv,Yaozhong Hu,Ruican Wang,Wentao Gu,Dongfei Tan,Shuo Wang
Chemotherapy-induced intestinal mucositis is a common and clinically important adverse effect. However, its underlying mechanisms remain poorly understood and effective interventions are limited. This study investigated the protective effects of a cell-free L. rhamnosus -fermented cereal fraction against 5-fluorouracil (5-FU) induced CIIM in a murine model. L. rhamnosus fermentation markedly enhanced the functional value of the cereal matrix by enriching soluble fermentation-derived bioactives, including TCA-soluble peptide content, total phenolic and flavonoid content, and lactic acid. Prophylactic administration of the fermented cereal fraction attenuated 5-FU-induced mucosal injury, enhanced intestinal antioxidant capacity, improved mucosal architecture and barrier-related indices, and suppressed epithelial apoptosis. Exploratory quantitative proteomic analysis identified candidate proteins whose abundance was altered following 5-FU treatment, including proteins associated with antioxidant defense, apoptosis, cytoskeletal organization, and epithelial barrier-related processes. In contrast, fermented cereal intervention restored the expression of key endogenous antioxidant and barrier-associated proteins. Notably, the final pH-matched lactic acid control indicated that low final pH and the direct presence of lactic acid were insufficient to account for the protective effects of the fermented cereal fraction, suggesting that multiple fermentation derived components contributed to the observed bioactivity. Collectively, these findings indicate that L. rhamnosus -fermented cereal mitigates CIIM through fermentation-enhanced exogenous antioxidant delivery, support of endogenous antioxidant defenses, and attenuation of mucosal and barrier-related alterations. This study supports the potential of cereal fermentation-derived bioactives as functional dietary ingredients for managing CIIM.
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高影响因子
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