JOURNAL OF FOOD PROCESSING AND PRESERVATION
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2022
·Vol. 46
·期 5
·e16582
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IF 2.609
Hua Yang,Xuexue Chen,Xiaomin Li,Dianhui Wu,Guolin Cai,Jian Lu
The effects of ascorbic acid (VC), reduced glutathione (GSH), sulfur dioxide (SO 2 ), chitosan, and ethylenediaminetetraacetic acid disodium (EDTA-2Na) on the color parameters of Dangshan pear wine during storage were investigated. The different addition amounts of VC and EDTA-2Na increased the browning degree of pear wine, and chitosan had a weak inhibitory effect on the browning of pear wine. The addition of 0.01%, 0.05%, and 0.10% GSH reduced the browning degree of pear wine by 8.80%, 13.82%, and 5.02%, respectively; 0.05% GSH decreased the color saturation and increased the brightness during the storage of pear wine. Adding 0.05% and 0.10% SO 2 reduced the browning degree of pear wine by 14.73% and 21.05%, respectively, the inhibitory effect for browning was significant, 0.10% SO 2 reduced the brightness of pear wine during storage. This result showed that GSH and SO 2 were the most effective candidate inhibitors for Dangshan pear wine browning. Novelty impact statement The addition of 0.05% GSH reduced the browning degree of pear wine by 13.82%. Adding 0.10% SO2 reduced the browning degree of pear wine by 21.05%. GSH and SO2 were the most effective inhibitors for Dangshan pear wine browning.
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ACS Omega
·
2022
·
IF 4.132
Huan Zhou,Wenwen Lin,Chao Chen,Chuang Liu,Jianghua Wu,Jianghao Wang,Jie Fu
As an essential chemical feedstock, aromatics can be obtained from biomass by catalytic fast pyrolysis (CFP) technology, in which diffusion limitation is still a problem. In this study, several ZSM-5 zeolites with intercrystal stacking macropores were synthesized by adding organosilanes (OSAs) with different alkyl chain groups. Due to the structure-directing effect of the OSA, the prepared ZSM-5 zeolites possess a larger external surface area and pore volume than Blank-Z5. Moreover, the pore size is related to the extent of anchoring of the OSA and silicon–aluminum species in the zeolite precursor. Pyridine Fourier transform infrared (Py-FTIR) and NH3-temperature-programmed desorption (TPD) analyses show that the obtained ZSM-5 zeolites have a higher Brønsted acidity and total number of acid sites. In addition, excessive addition of OSA is not conducive to the growth of ZSM-5 zeolites. The catalytic performance of the synthesized ZSM-5 zeolites was evaluated by Py-GC/MS. The larger external surface area and pore volume improve the accessibility of the acid sites and thus promote the conversion of biomass into aromatics.
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PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Chenyao Bi,Zhuangzhuang Zhang,Daizong Han,Chengan Wang,Jianbo Zhang,Ming Sun,Qingqing Hao,Huiyong Chen,Xiaoxun Ma
Quality improvement of pyrolysis tar with yield increasing of high value-added components is highly desired for coal utilization. Herein, Ga-impregnated mesoporous ZSM-5 (Ga/MZ5) directed by organosilane surfactant of [3-(trimethoxysilyl) propyl] octadecyldimethylammonium chloride (TPOAC) is used as a catalyst for the catalytic upgrading of coal pyrolysis volatiles. Effective regulation by reduction and reduction/reoxidation promotes a secondary dispersion of gallium species from external surface deposition to micropore permeation. The comprehensive evaluation of catalytic upgrading performance indicates that the designedly regulated gallium species (mainly Ga + , GaH 2 + and GaO + ), feasible balance of Brønsted and Lewis active sites and mesopore diffusion superiority effectively contribute the yield increasing of both light-fraction ( M LF / M Tar ) and target products of BTEXN (benzene, toluene, ethylbenzene, xylene and naphthalene). The optimal catalyst of Ga/MZ5_R/O exhibited the highest value of M LF / M Tar (88 %) and highest yield of BTEXN (31.84 mg.g −1 ), which are 173 and 589 % higher than non-catalytic single pyrolysis and 133 and 280 % higher than those over the conventional Ga-impregnated ZSM-5 (Ga/Z5). Moreover, the possible reaction networks towards high value-added products of BTEXN based on the positive conversion of polycyclic aromatic hydrocarbons (PAHs), phenols, and other oxygen-containing compounds (abbreviated as PPO) is further proposed.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Mengqin Li,Mei-jin Lin,Yuezhong Meng,Dongyang Chen
To expand the properties of epoxy coatings for emerging technologies, herein, a pillar[5]arene-based epoxy compound (PAEP) containing unique pillar-shaped three dimensional macrocyclic structure was prepared and cured with conventional 4,4′-diaminodiphenylmethane (DDM). Interestingly, the PAEP exhibited a strong host-guest complexation with 1,4-dibromobutane (DBrBu), a potential organic antibacterial agent, with a complex constant of 215.7 ± 11.02 M −1 . Furthermore, the PAEP/DDM resin possessed enhanced mechanical and thermal properties, probably due to the increase of chain-entanglement brought about by the cyclic structure. Also, the PAEP/DDM resin exhibited excellent intrinsic flame retardant properties, including significantly reduced peak heat release rate (153.5 W·g −1 ) and high limit oxygen index (LOI) (34.7%), and a V-0 rating in the UL-94 test. Moreover, the PAEP/DDM resin exhibited a remarkably low dielectric constant of 2.25 at 10 6 Hz for telecommunication applications, which is much lower than the current epoxy resins with nanoporous inorganic modifiers. Therefore, the incorporation of pillar[5]arene is a fruitful pathway to expand the properties of epoxy resins and provides a new platform for decoration for various applications.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Jia Hongyan,Lv Qing,Xia Qineng,Hu Wanpeng,Wang Yanqin
Efficient conversion of biomass-derived 5-hydroxymethylfurfural (HMF) to renewable fuels such as 2,5-dimethylfuran (DMF) and 2,5-dimethyltetrahydrofuran (DMTHF) is of significance for sustainable energy supply. For efficient catalyst design, it is important to understand the catalytic behavior and clarify the influence of physico-chemical properties of catalyst on reaction performance. Herein, to study the structure-activity relationships of monometallic Cu catalysts for HMF hydrogenolysis, a series of Cu/SiO2 catalysts with different physico-chemical properties were prepared and compared for their catalytic performance in HMF hydrogenolysis. It was found that Cu/SiO2-HT-8.5 catalyst prepared by hydrothermal method showed excellent activity in HMF hydrohydrolysis reaction. Under the optimal reaction condition, the total yield of liquid fuels reaches 91.6% with 57.1% yield of DMF and 34.5% yield of DMTHF in THF solvent. Characterizations such as XRD, H2-TPR, N2-adsorption/desorption, TEM and XPS revealed that the Cu particles in the Cu/SiO2-HT-8.5 catalyst have uniform size and high dispersion. The Cu species and the SiO2 support have relatively weak interaction and are easy to be reduced to Cu0, which makes it show excellent activity in the hydrogenolysis of HMF.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Pengrui Zhang,Ciming Wang,Zixuan Xue,Lianjing Mao,Jinhe Sun,Fei Shao,Mixiang Qi,Yan Jing,Yongzhong Jia
Controlled fusion energy is considered to be one kind of sustainable energy source with clean and green properties. The fusion process requires a large number of lithium isotopes, but the naturally stable lithium isotopes 6 Li and 7 Li cannot be directly applied to the fusion process and must be further enriched. In this paper, a system for the separation of lithium isotopes by extraction was investigated, which mainly consists of bromobenzene-15-crown-5 and ionic liquids. The effects of ionic liquids, lithium salts, crown ether concentration, and temperature on the separation performance of lithium isotopes were explored. It was found that 6 Li was enriched in the organic phase and the single-stage separation factor reached 1.032. It was proved by the temperature experiment that the exchange of lithium isotopes was a spontaneous and exothermic process. The complexation ratio of crown ether and lithium ions was 1:1. The optimized complexation model and the interaction of crown ether and lithium ions were calculated by DFT and Multiwfn. Lithium ions were weakly bonded to the crown ether and strongly bonded to the water molecule as demonstrated by the non-bonded interactions and Mayer bond order of Li-O. Meanwhile, the mechanism of lithium isotope separation with crown ether was clarified by mutual verification of experiment and theoretical calculations.
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ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Peng Zhu,Weizi Zhang,Qinfang Li,Haian Xia
Photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is an environmental friendly way to convert platform molecules into high-value chemicals. Here, Au/ZnO catalysts with different oxygen vacancies were fabricated by the deposition precipitation method and were used for the photocatalytic oxidation of HMF to FDCA under visible light irradiation. All of the Au/ZnO catalysts showed excellent photocatalytic oxidation selectivity to FDCA greater than 90% under mild conditions. The Au/ZnODP-H catalyst treated by H2 afforded the highest HMF conversion and the selectivities of FDCA up to 96.9%. The localized surface plasmon resonance effect of Au nanoparticles, oxygen vacancy, and the existence of the Schottky barrier enhance the separation and transfer efficiency of photogenerated electron–hole pairs of the catalyst, so as to enhance its photocatalytic activity. The active species trapping experiment and electron spin resonance analysis showed that •O2– and h+ were the active species responsible for the oxidation reaction. The recycle experiment also proved that the catalyst has good stability. This work provides a new strategy for the design of photocatalysts for converting biomass into high-value chemicals.
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高影响因子
FUEL
·
2022
·
IF 8.035
Xiaopo Niu,Rong Zhao,Yunxi Han,Xiangwen Zhang,Qingfa Wang
Deep hydrogenation of polycyclic aromatic hydrocarbons is a feasible strategy to acquire high-performance aviation fuels, in which the key is to design highly active hydrogenation catalysts. Herein, hollow ZSM-5 (HZ) and silicalite-1 (HS) zeolites with hierarchical porous architectures were manufactured through a post-alkali treatment strategy, and further supported Pt to fabricate Pt/HZ-WI, Pt/HZ-SEA and Pt/HS-SEA catalysts employing wet impregnation (WI) and strong electrostatic adsorption (SEA) methods. The SEA catalysts presented higher metal dispersion, more election-deficient Pt δ+ species and stronger spillover hydrogen ability, thus resulting in better intrinsic hydrogenation properties in the deep hydrogenation reaction of phenanthrene than the WI ones. Moreover, Pt/HZ-SEA catalyst showed the supreme catalytic activity and the lowest activation energy of 52.11 kJ·mol −1 due to more hydrogenation active sites generated by the highly dispersed Pt clusters and the accelerated diffusion of reactants via the hierarchical porous architectures. Almost 100% selectivity to the deep hydrogenation products was achieved at rather low temperature of 220 °C. The Pt/HZ-SEA also displayed outstanding activity for hydrogenation of naphthalene, acenaphthylene and fluorene and excellent sulfur resistance. Furthermore, the acidic sites in HZ zeolite were favorable to boost the formation of electron-deficient Pt δ+ species having stronger deep hydrogenation ability and intensify the additional hydrogenation route through the spillover hydrogen. Finally, the DFT calculation results further verified that the Pt δ+ substances could heighten the adsorption of polyaromatics, thereby improving the deep hydrogenation activity.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jian Tian,Chuanhu Wang,Junwei Wu,Daohua Sun,Qingbiao Li
Pt works particularly well as a nanoparticle catalyst in the elimination of atmospheric pollutants, but its application is severely hampered by agglomeration and even poisoning in the presence of moisture. Hereby, a novel catalyst Pt@O-ZSM-5@OTS was synthesized to protect Pt, namely 0.5 wt% Pt was integrated into hollow ZSM-5 and subsequently coated hydrophobic octadecyltrichlorosilane (OTS) akin to the waterproof carapace. With the aid of various characterization techniques, the hybrid catalyst induced multiple marked features, such as dual-shell structure, hydrophobic microenvironment, and encapsulated active sites. Under excessively humid conditions (10 vol% H 2 O), the optimized Pt@O-ZSM-5@OTS2 exhibited a stable benzene conversion efficiency of 100 % for 120 h and outperformed the catalysts reported so far. Even reducing the reaction temperature to 170 °C, the conversion of benzene also reached 85 %, far exceeding the performance of untreated Pt@O-ZSM-5 (∼50 %). The outstanding stability stems from the hollow structure and OTS shell, which not only provide Pt with a protective shield against active site coverage, but also enhance competitive adsorption to benzene. Furthermore, DFT simulations unveil that the hydrophobic OTS shell enhances water resistance, consequently facilitates the oxidative degradation of contaminants at the active site. This work sheds light on novel strategies for the preservation of Pt by hydrophobic zeolite structures, as well as a deeper understanding of the elimination of aqueous VOCs.
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高影响因子
GENE
·
2022
·
IF 3.913
Xiaohong Chen,Yueya Zhang,Haifeng Yan,Meiyun Niu,Yuping Xiong,Xinhua Zhang,Yuan Li,Jaime A. Teixeira da Silva,Guohua Ma
The commercial value of Santalum album L. lies in its aromatic heartwood and essential oil. Sesquiterpenes are the main components of sandal essential oil, and these are synthesized through the plant’s mevalonate (MVA) and methylerythritol phosphate (MEP) pathways. In this study, the first key rate-limiting enzyme, 1-deoxy- d -xylulose-5-phosphate synthase (SaDXS), was investigated to provide a theoretical molecular basis for the sandalwood MEP sesquiterpene biosynthetic pathway. The biofunctions of SaDXS were also analyzed. SaDXS promoters were successfully cloned from a seven-year-old S. album tree. SaDXS1A/1B promoter activity was verified by a β-glucuronidase (GUS) assay and by analyzing cis -acting elements of the promoters, which carried light- and methyl jasmonate (MeJA)-responsive signals. In an experiment involving yellow S. album seedlings, exposure to light upregulated SaDXS1A/1B expression and increased chlorophyll and carotenoid contents when overexpressed in Arabidopsis thaliana . Analysis of the expression of SaDXS1A/1B and SaSSy , key genes of santalol biosynthesis, revealed SaDXS1A expression in all tissues whereas SaDXS1B was expressed in tissues that contained photosynthetic pigments, such as stems, leaves and flowers. Sandal seedlings exogenously treated with two hormones, MeJA and ethylene, revealed similar expression patterns for SaDXS1A/1B and SaSSy . Sandal seedlings were treated with an inhibitor of DXS, clomazone, but showed no significant changes in the contents of α-santalene, β-santalene and α-santalol between treatment and control groups. These results suggest that SaDXS1A/1B play a role in the synthesis of sandalwood sesquiterpenes, providing carbon for downstream secondary metabolites. SaDXS1A/1B also play a role in the biosynthesis of chlorophyll, carotenoids, and primary metabolites.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Ning Shi,Yuju Zhu,Bangzhi Qin,Tianlang Zhu,Hongsheng Huang,Ying Liu
The production of 5-hydroxymethylfurfural (HMF) from cellulose is a crucial step in the production of high-value chemicals and fuels from renewable cellulosic biomass. In this study, the influences of the H2O/organic solvent ratio, the type of organic solvents, the addition of NaCl, and the type and concentration of catalysts on the catalytic conversion of cellulose into HMF in biphasic systems were comprehensively studied, and the highest HMF yield of 45.7% was obtained from cellulose in the H2O–tetrahydrofuran (THF) biphasic system with Al2(SO4)3 as the catalyst. Further investigation reveals that the excellent performance of the H2O–THF–Al2(SO4)3 reaction system was ascribed to the high Vorg/Vaque (60/1), high C[Al2(SO4)3]aque (0.38 g/mL), and low C[Al2(SO4)3]org (10–4 g/mL) of the reaction system. Moreover, the byproduct formed during the conversion of cellulose in the H2O–THF–Al2(SO4)3 reaction system was characterized by liquid chromatography–mass spectrometry (LC–MS) and LC–MS2 to detect considerable initial polymers. One plausible mechanism of glucose conversion in the H2O–THF biphasic system was proposed based on the detected compounds.
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 2
·1003-1015
·
IF 2.081
Chen Anna,Zhang Jin,Zhou Yi,Tang Haiqin
In this study, the MOF-5/BiOBr photocatalyst with microsphere structure was synthesized by hydrothermal method for the first time. The crystal structure, morphology, photoelectric performance and photocatalytic activity of the samples were characterized by XRD, SEM, TEM, XPS and electrochemistry. The results show that the synthesized MOF-5/BiOBr photocatalyst exhibits better photocatalytic performance than pure MOF-5 and BiOBr under simulated sunlight. The efficiency of Rhodamine B (RhB) removal based MOF-5/BiOBr composite (MOF-5 with mass ratio of MOF-5/BiOBr = 20 wt% of) reached 99.7%. The possible photocatalytic mechanism is discussed through the capture experiment of active species. The enhanced photocatalytic performance of the MOF-5/BiOBr composite may be related to the interaction between BiOBr and MOF-5 and the type II charge transfer path. The catalyst has simple preparation process, low cost, high activity under natural light, and high efficiency, and is expected to play a role in the treatment of environmental wastewater. This work provides a new insight for designing MOF-5 based photocatalyst.
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