INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Tinghu Wang,Yuzhi Li,Wenjing Zhang,Furang Li,Lei Fan,Jianye Fu,Xinmei Liu,Yuchao Lyu
Acidity of supports always plays a key role in the determination of dispersion and electron density of metal components and then the catalytic behavior of bifunctional catalysts for deoxygenation of biomass-based resources. Herein, Ni/ZSM-5 catalysts with various Si/Al ratios and acidity were synthesized, and the role of acid centers in the deoxygenation of methyl laurate (ML) was discussed. The decreasing Si/Al ratios promote dispersion of Ni due to the anchoring effect of framework Al to nickel species. It also increases the electron density of Ni, which not only benefits the activation of hydrogen but also curbs the cleavage of C–CHO bonds. All of these accelerate ML transformation and preferentially promote the hydrodeoxygenation (HDO) route instead of decarboxylation (DCO2) or decarbonylation ones. The metal centers play a key role in the hydrogenolysis of ML and the hydrogenation of resultant fatty acids, while the acid centers can facilitate these processes. Besides, suitable acidity of the catalyst would increase selectivity to target alkanes and isomerized ones for biojet fuels by enhancing the HDO routes. However, excessive acid centers favor cracking reactions, reducing the selectivity of target products. This work contributes a profound understanding of the role of acid centers in the deoxygenation of ML into biojet fuels and can be extended to other bifunctional deoxygenation catalysts.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yongqiang Zhang,Zhiwei Zhou,Bingchu Mei
The high optical quality Nd 3+ doped asymmetrical (Ca x Sr 1-x ) 5 (PO 4 ) 3 F transparent ceramics were successfully fabricated using the hot-pressing method. The phase composition, in-line optical transmittance, microstructure and fluorescence properties were discussed. The findings revealed that the Ca 2+ and Sr 2+ were dissolved in Sr 5 (PO 4 ) 3 F crystal cell instead of forming a new heterophase structure. The prepared ceramics exhibited an in-line transmittance of 75 % at 1μm and 55 % at 600 nm, demonstrating high transparency rather than translucency. The emission intensity and FWHM of neodymium doped ceramic samples can be significantly enhanced through co-doping with Ca 2+ and Sr 2+ . Furthermore, by adjusting the Ca/Sr ratio, these samples can achieve controllable emission light within the wavelength range between neodymium doped FAP and S-FAP emissions. The fluorescence lifetime was obviously improved compared with Nd: FAP and slightly reduced compared with Nd: S-FAP. Moreover, the fluorescence lifetime trend varies in accordance with the alteration of lattice constant.
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Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 8
·1-12
·
IF 4.3
Chun Weilong,Yang Chenbiao,Wang Xu,Yang Xin,Chen Huiyong
A facile synthesis of hierarchical ZSM-5 with the three-dimensionally ordered mesoporosity (3DOm ZSM-5) was achieved by solid conversion (SC) of SiO 2 colloidal crystals to high-crystalline ZSM-5. The products of 3DZ5_S/C and 3DZ5_S, which were severally transformed from the carbon-padded SiO 2 colloidal crystals and the initial SiO 2 colloidal crystals, exhibited not only a similar ordered structure and acidity but also higher crystallinity and more balanced meso-/micropore combination in comparison with 3DZ5_C obtained by the conventional confined space crystallization approach. All three synthesized 3DZ5 catalysts showed improved methanol-to-propylene performance than the commercially microporous ZSM-5 (CZ5), embodied in five times longer lifetime, higher propylene selectivity and S propylene / S ethylene ratio ( P/E ), and superior coke toleration with lower formation rate of coke ( R coke ). Moreover, the 3DZ5_S catalyst in situ converted from SiO 2 colloidal crystals presented the highest selectivities of propylene (42.51%) and light olefins (74.6%) among all three 3DZ5 catalysts. The high efficiency in synthesis and in situ utilization of SiO 2 colloidal crystals demonstrate the proposed SC strategy to be more efficiently and eco-friendly for the high-yield production of not only 3DOm ZSM-5 but also other types of hierarchical zeolites.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2018
·
IF 3.468
Gongxin Dai,Shurong Wang,Shuqiong Huang,Qun Zou
The catalytic pyrolysis of biomass is a promising technology for producing high-quality fuels and value-added chemicals. However, the development of this technology has been hindered by high coke formation and low target product yield. In this study, chemical liquid deposition (CLD) was adopted to improve the catalytic performance of HZSM-5 in the catalytic pyrolysis of biomass. The changes of the characteristics, including crystallographic structure, porosity and acidity, of the HZSM-5 zeolite after modification were analyzed by XRD, N 2 adsorption-desorption, FTIR and NH 3 -TPD. The results showed that CLD modification reduced the mesopore volume, pore opening size and the number of external acid sites without changing the micropore structure. Py-GC/MS (a pyrolyzer equipped with a gas chromatography-mass spectrometer) and kinetic analysis were used to analyze the catalytic performance of the parent and CLD-modified zeolites. It was found that the production of aromatics increased first and later decreased, reaching optimal levels at a 4% deposition of SiO 2 , while the selectivity of monoaromatics increased continuously. Additionally, CLD modification raised the energy barriers for the char/coke formation reactions and could inhibit its production. The deposition amount of 4% showed the best char/coke inhibitory effects for catalytic pyrolysis of cellulose, while the char/coke formation decreased continuously with the increase of the deposited amount of SiO 2 for catalytic pyrolysis of lignin.
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LIQUID CRYSTALS
·
2014
·
IF 2.349
Hongyu Guo,Jinqi Ye,Fafu Yang
Two novel triphenylene liquid crystals with 15-crown-5 unit as side-chain 4a and 4b were designed and synthesised by simple procedures in ideal yields. Their structures were confirmed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (1H NMR), electrospray ionization mass spectrometry (ESI-MS) and elemental analysis. Their liquid-crystalline behaviours before and after complexation with metallic salts were studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. Neat compounds 4a and 4b show mesophase with triphenylene column, while complexes of 4a and 4b with metallic salts exhibit no mesophase but higher melting point.
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CARBOHYDRATE RESEARCH
·
2022
·
IF 2.975
Hongjun Zang,Yimo Feng,Mingchuan Zhang,Kai Wang,Yannan Du,Yaxin Lv,Zixian Qin,Yunfei Xiao
3-Acetamido-5-acetylfuran(3A5AF) is a nitrogen-containing fine chemical and has broad application prospects and high research value. Herein, we report a mild and efficient method for the synthesis of 3A5AF from N-acetyl- d -glucosamine (NAG). The influence of solvent, temperature and additive on the catalytic performance was also studied. The Lewis acids with high catalytic efficiency have been smoothly screened. The highest yield (41.57%) of 3A5AF was obtained in the presence of B 2 O 3 and MgCl 2 ·6H 2 O at 180 °C for 60 min under normal atmospheric conditions. The reaction pathway was explored by LC-MS, 1 H NMR, 13 C NMR and FT-IR spectra. Compared with the microwave method and hydrothermal method , the optimized reaction condition was relatively mild. Moreover, the catalyst MgCl 2 ·6H 2 O is low-cost and environmentally friendly.
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Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Wei Qi,Yuqi Chen,Liangzhi Li,Xin Ju,Hongwei Chen,Lishi Yan
The catalytic conversion of fructose to 5-hydroxymethylfurfural (5-HMF) in ternary deep eutectic solvent (DES)/methyl isobutyl ketone (MIBK) biphasic system at mild temperatures (50~70 ℃) was investigated in this work. The ternary DES consists of choline chloride (ChCl), benzene sulfonic acid (BSA) and ethylene glycol (EG) were physiochemical characterized by FT-IR and 1H NMR. The ternary DES(ChCl-BSA-EG)/MIBK biphasic system (ChCl/BSA/EG=2:1:1) resulted in 82.0% 5-HMF yield and 96.2% corresponding selectivity at 60 °C for 2 h. The kinetic analysis further revealed that the rate constant of fructose dehydration (k1) was much higher than the rate constant of 5-HMF conversion (k2). The calculated ratio of k1/k2 was 16.1. The proposed reaction mechanism suggested that the synergetic effect of the three components of ternary DES facilitates the elimination of water molecules from fructose and the formation of 5-HMF, while the MIBK extraction phase suppress the byproducts of 5-HMF as well. The present work provides a green and sustainable pathway for 5-HMF production with high yield and high selectivity at mild temperatures.
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Toxics
·
2024
·Vol. 12
·期 6
·380
·
IF 3.9
Hui Yang,Xue Zhang,Yadong Zhu,Bo Zhang,Junfeng Fan,Hongfei Zhao,Bolin Zhang
Acrylamide (AA) and 5-hydroxymethylfurfural (HMF), which are potentially carcinogenic to humans, are often produced during the hot processing of foods. This study first used a molecular docking model to simulate the binding behavior of four lactic acid bacteria peptidoglycans (PGNs) to AA/HMF, and the binding rate of LAB-based PGNs to AA/HMF was evaluated in vitro. In silico results show that interaction energy is the driving force responsible for the adsorption of LAB-derived PGNs to AA/HMF. In vitro results showed that the PGN ofB. lactisB1-04 bound the most AA (28.7%) and HMF (48.0%), followed byL. acidophilusNCFM,B. breveCICC 6079, andL. plantarumCICC 22135. Moreover, an AA/HMF-bound layer on the cell surface ofB. lactisB1-04 was observed via AFM and SEM due to adsorption. XPS analysis indicated the removal rate of AA/HMF by selected strains was positively correlated with the proportion of C-O, C=O, and N-H groups of PGNs. The atoms O1, O2, O3, O4, N1, N2, N3, H1, and H2 are involved in the adsorption of LAB-based PGNs to AA/HMF. Thus, the PGNs derived from these fourLactobacillusstrains can be regarded as natural adsorbents for the binding of AA/HMF.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2025
·Vol. 26
·期 8
·3648
·
IF 4.9
Pize Xiao,Wei Mao,Zhiming Wu,Huimin Gao,Chutong Ling,Jinghong Zhou
A sustainable and efficient approach for converting carbohydrates into 5-hydroxymethylfurfural (HMF) via heterogeneous catalysis is crucial for effectively utilizing biomass. In this study, we synthesized a series of CrX-polyphenol-formaldehyde resin (PTF) catalysts, which are composites of Cr-doped phenolic-resin-based hydrothermal carbon, using a chelation-assisted multicomponent co-assembly strategy. The performance of the synthesized catalysts was assessed through various analytical techniques, including scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, pyrolysis–Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller analysis. Cr incorporation into the catalysts enhanced the total and Lewis acidities. Notably, the optimized catalyst, designated as Cr0.6-PTF, achieved an effective glucose conversion into HMF, yielding a maximum of 69.5% at 180 °C for 180 min in a saturated NaCl solution (NaClaq)/dimethyl sulfoxide (2: 18) solvent system. Furthermore, Cr0.6-PTF maintained excellent catalytic activity and a stable chemical structure after nine cyclic reactions, resulting in a 63.8% HMF yield from glucose. This study revealed an innovative approach for utilizing metal-doped phenolic resin hydrothermal carbon to transform glucose into platform chemicals.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Huiyu Liu,Chengyu Li,Rui Shan,Jun Zhang,Haoran Yuan,Yong Chen
The growing accumulation of waste polyethylene terephthalate (PET) has raised great concern about its effective upcycling. Catalytic fast pyrolysis is a promising method for selectively upcycling of waste PET into aromatics. However, the high temperature and poor mass transfer performance remain considerably challenging. In this research, a diffusion-enhanced hollow ZSM-5 catalyst with Ru modification was designed for low-temperature valorization of waste PET into aromatics. Ru species significantly enhanced the primary depolymerization of long-chain polymers by generating abundant Lewis acid sites, which markedly increased the aromatics content. Additionally, the mesopore-rich structure formed after Ru-modification improved diffusion capacity of products effectively. The existing of active Ru 0 species was beneficial to the hydro-upgrading of oxygen-containing intermediates, therefore monocyclic aromatic hydrocarbons (MAHs) content and hydrogen atom utilization increased to a great extent. More gratifyingly, the pyrolysis temperature for preparing aromatics from waste PET was obviously lowered, probably due to the synergistic effect of diffusion-enhanced structure and Ru modification. Ru/ZH exhibited higher aromatics yield of 46.4 wt% with selectivity of 95.3 % at 500 °C, resulting in a significant mass yield increase of 93.1 % compared to unmodified hollow ZSM-5 (24.0 wt%). Finally, the plausible pathway for PET-to-aromatics via catalytic fast pyrolysis over Ru/ZH was proposed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jieqiong Wang,Fei Li,Zhengwei Xu,Mingsong Zang,Shengda Liu,Tianhe Li,Jiayun Xu,Hongcheng Sun,Shuangjiang Yu,Junqiu Liu
Bacterial infection is one of the most serious physiological conditions threatening human health. There is an increasing demand for selective antibacterial therapy through noninvasive approaches recently years. Herein, a novel strategy for fabrication of positively charged, monolayered nanosheets (P5PD) bearing perylene diimide derivative (DAPDI) was reported through covalent self-assembly with laterally-brominated pillar[5]arene (LBP5). Mannose derivative (Man-HQA) was further immobilized to P5PD nanosheets (named as mP5PD) through host–guest complexation with LBP5 for improving biocompatibility and recognition with microbes. It was found that the mP5PD nanosheets could be converted to radical anions in the presence of E. coli in terms of their excellent reductive surroundings, which showed excellent photothermal conversion efficiency under the 0.5 W/cm 2 of 808 nm laser irradiation. Moreover, the selective photothermal antibacterial activity could be realized by the different ability of amplifying radical anions for facultative anaerobic E. coli and aerobic B. subtilis . Importantly, the mP5PD nanosheets exhibited excellent biocompatibility to mammalian cells even at high concentration, which held great potential for developing intelligent photothermal nanomaterials in future biomedical fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Renzhi Xiong,Fangde Liu,Xiao Xiao,Yuhao Wu,Yanhe Xiao,Baochang Cheng,Shuijin Lei
While photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) into valuable chemicals represents a crucial strategy for advancing carbon neutrality, low conversion rates and poor product selectivity hinder commercialization. In this study, a dual-sulfur-vacancy (S v )-mediated Cu 2 ZnSnS 4− x /ZnIn 2 S 4− x all-multinary-sulfide p-n heterojunction was designed for high-efficiency photocatalysis. Specifically, S v introduction significantly enhanced light absorption, photothermal properties, and interfacial electric fields (IEF). Consequently, the Cu 2 ZnSnS 4− x /ZnIn 2 S 4− x heterostructure achieved outstanding photothermal-assisted photocatalytic oxidation of HMF to 2,5-diformylfuran (DFF), with an oxidation rate of 94.1%, which was 9.1 and 4.0 times higher than that of Cu 2 ZnSnS 4 and ZnIn 2 S 4 , respectively. The selectivity of DFF reached 92.8%. Additionally, mechanistic analysis identified primary active species and possible reaction pathways. This study provides a potential strategy for the design of photocatalytic systems for efficient HMF oxidation.
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高影响因子
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