INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xiaoxian Li,Yuanzhe Gong,Qi Lu,Min Lin,Jian Liu,Yulong Wu
In this work, the hierarchical pore HZSM-5 zeolite was synthesized by the method of alkali treatment, and the bimetallic loading of Mo and Cu was investigated for the hydrothermal aromatization of stearic acid. After alkali treatment, the pore size of HZSM-5 increased, but the acid sites decreased. The metal loading reintroduced the Lewis acid sites, greatly increasing the ratio to Brönsted acid sites. Therefore, the treated catalyst achieved higher hydrothermal stability while maintaining the high activity of hydrothermal aromatization of stearic acid. Mo0.02Cu0.01/Z-0.2M achieved excellent activity in the stearic acid hydrothermal aromatization with a high overall TEX (toluene, ethylbenzene, and xylenes) yield of 50.19 wt %, including 10.30 wt % toluene, 3.82 wt % ethylbenzene, and 36.07 wt % xylene. In addition, Mo0.02Cu0.01/Z-0.2M still showed excellent catalytic activity while applied in the system of the simulated microalgal bio-oil. As the reactant changed to the mixture of stearic acid and hexadecanamide, an overall TEX yield of 34.11 wt % was obtained at 450 °C. These results demonstrate the excellent hydrothermal aromatization ability of the MoCu-supported hierarchical pore ZSM-5 zeolite, which provides the potential to produce value-added chemicals from algal biomass.
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 37
·6182-6188
·
IF 3.117
Xueshuai Chen,Rongli Jiang,Huilin Hou,Zihan Zhou,Xingwen Wang
ZSM-5/SAPO-34 zeolite composites were successfully synthesized by adding ZSM-5 into SAPO-34 synthetic gel under hydrothermal synthesis conditions, and SAPO-34 as a part of the composite zeolite was synthesized from LAPONITE® as the Si source. The presence of ZSM-5 in the synthetic gel affects the nucleation and crystal growth rate, and core–shell structured zeolite composites can be formed by adding an appropriate amount of ZSM-5. LAPONITE® itself contains Li and Mg atoms which were subsequently introduced into the framework of the SAPO-34 part in the composites via depolymerization–reorganization during the process of crystallization. Furthermore, the depolymerized LAPONITE® can be converted in situ into zeolitic precursors and act as crystalline seeds under hydrothermal conditions. Compared with the ZSM-5/SAPO-34 zeolite composites synthesized from tetraethylorthosilicate (TEOS) instead of LAPONITE® as the Si source, the ZSM-5/SAPO-34 composites synthesized from LAPONITE® exhibited higher selectivity to light olefins and longer lifetime in the MTO reaction. This work provides a convenient route to the synthesis of ZSM-5/SAPO-34 zeolite composites with excellent MTO performance.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Bing-Ping Yang,Chun-Li Hu,Fei-Fei Mao,Xiang Xu,Jiang-Gao Mao
Two new barium gold iodates, namely, BaAu(IO3)5 and HBa4Au(IO3)12, have been prepared. BaAu(IO3)5 crystallizes in the polar space group Pca21, whereas HBa4Au(IO3)12 crystallizes in the centrosymmetric space group P21/c. BaAu(IO3)5 consists of unique polar [Au(IO3)4]− anions whose four iodate groups are located at both sides of the AuO4 plane and the polarity points in the [001̅] direction. BaAu(IO3)5 displays strong second-harmonic-generation (SHG) effects about 0.6KTiOPO4 (KTP) and is phase-matchable. Thermal properties, optical spectra analyses, and theoretical calculations are also reported.
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DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Shiyou Xing,Pengmei Lv,Che Zhao,Ming Li,Lingmei Yang,Zhongming Wang,Yong Chen,Shijun Liu
Non-H 2 and solvent-free catalytic conversion of waste lipids to liquid hydrocarbons is of great interest because of the associated low-cost, full-safety, and easy-operability. In this work, a solvent-free catalytic process for deoxygenating oleic acid was performed in H 2 and non-H 2 (N 2 , CH 4 , and CO 2 ) media over nano-Ni/HZSM-5. 8-Heptadecene, a primary product obtained at 320 °C in four media, was derived from the straightforward decarboxylation of oleic acid. In non-H 2 medium at 360 °C, the formation of C 8 –C 15 alkanes was enhanced, with yields of ca. 65.05 mol%, 70.71 mol%, and 73.09 mol% for N 2 , CH 4 , and CO 2 , respectively. A low yield of 49.67 mol% C 8 –C 15 alkanes in H 2 medium suggested that the H 2 medium reduced catalytic cracking . This was due to the preferential formation of stable heptadecane from 8-heptadecene in the presence of abundant H 2 . The absence of H 2 favored the cracking of 8-heptadecene. These cracked products were further converted to C 8 –C 15 alkanes, for which a mass supply of hydrogen was mandatory. Gas-phase reactions including methanation , Fisher-Tropsch (F-T) synthesis, and water-gas shift (WGS) reactions between deoxygenated gas products and reaction media provided significant pathways for the hydrogen required for the formation of alkanes. The CH 4 medium also acted as a hydrogen source due to its decomposition, catalyzed by nano-Ni/HZSM-5. Coke was substantially formed in all the four media. It was highlighted that the medium of H 2 favored the formation of aliphatic cokes, whereas the non-H 2 media, particularly the CO 2 medium, facilitated aromatic coke species on account of its weak oxidizability. Additionally, there was a severe loss of loaded Ni nanoparticles under H 2 medium but a slight Ni loss in CO 2 medium, which was proposed to the reason of aromatic cokes formation at the catalyst surface , acting as a trap for the loaded Ni nanoparticles.
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DOI
高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Zhenzhen Yang,Wei Qi,Rongxin Su,Zhimin He
Selective synthesis of various versatile compounds from biomass is of great importance to replace traditional fossil fuel resources. A novel magnetic catalyst, ZnFe1.65Ru0.35O4, was prepared via a simple alkali-coprecipitation method. The structure of the as-prepared catalyst was characterized, and its catalytic performance was investigated for aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA) under different reaction conditions. A high DFF yield of 93.5% was obtained for the reaction at 110 °C for 4 h in dry DMSO, whereas the maximum FDCA yield of 91.2% was achieved for the reaction at 130 °C for 16 h in H2O/DMSO (1:2, v/v). More importantly, a plausible reaction pathway was proposed for the aerobic oxidation of HMF into FDCA, with the rate-determining step determined through kinetic study. In addition, DFF or FDCA could be produced from fructose by sequentially using a magnetic solid acid (Fe3O4–RGO–SO3H) and ZnFe1.65Ru0.35O4. The dehydration of fructose in the presence of Fe3O4–RGO–SO3H resulted in HMF. After the removal of Fe3O4–RGO–SO3H from the reaction solution with a magnet, HMF was further oxidized in the catalysis of ZnFe1.65Ru0.35O4. These two consecutive steps gave DFF in 73.3% yield and FDCA in 70.5% yield, under the respective optimum reaction conditions. The direct synthesis of DFF or FDCA from fructose avoids tedious separation of intermediate HMF, leading to savings, with regard to both time and cost.
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DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Jun Zhang,Zhen Wu,Yafei Wu,Xiaoling Liu,Xun Li,Yu Zhang,Haian Xia,Fei Wang
Catalytic cracking of fatty acid methyl esters (biodiesel) is an attractive alternative to petroleum processing to produce valuable and versatile aromatics over the Zn-modified HZSM-5(25) catalysts. The catalysts with a Zn loading amount of 0–2.6 wt % were prepared and characterized. The introduction of Zn species presented great effects on the textural property and acidity of the parent HZSM-5(25) zeolite, and the chemical state of Zn species was heavily dependent on the amount of Zn loading. The strong Brönsted acid sites on the 0.5% Zn/HZSM-5(25) catalyst were exchanged by Zn species and formed new Zn-Lewis acid sites, which were identified as [ZnOH]+ and Zn2+ species. These Zn species greatly enhanced the dehydrogenation activation of alkanes to form more alkenes. Besides, they also promoted the further dehydrogenation reactions during aromatization of alkenes, thus improving the formation of H2 (>4 wt %) and increasing the production of aromatics (>40 wt %). The dominant components in the organic liquid product were monocyclic aromatics including benzene, toluene, and xylenes. Moreover, the 0.5% Zn/HZSM-5(25) catalyst exhibited an excellent stability, adaptability, and regeneration.
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DOI
高影响因子
BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-15
·
IF 0
Guo J.,Ma Yu L.,Yu Jia Y.,Gao Yu J.,Ma Ning X.,Wu Xiao Y.
Herein, 2-(2-methoxyphenoxy)-1-phenylethanol (β- O -4), 2-methoxyphenyl anisole (α- O -4) and 4-phenoxyphenol (4- O -5) were selected as typical lignin model compounds. Given the effectiveness of traditional acid–base catalysts for lignin depolymerisation, a novel Ni/CaO–H-ZSM-5(60) catalyst was prepared to investigate the difficulty level of C–O bond of three model compounds cleavage in ethanol. It was observed that Ni/CaO–H-ZSM-5(60) had prominent performance on the C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ). Among them, the C–O bond of α- O -4 and β- O -4 could be completely cleaved within 60 min. Although the C–O bond of 4- O -5 had high bond energy, 41.2% of conversion was occurred in 60 min. The introduction of CaO could regulate the acidity of H-ZSM-5 to enhance the ability to break C–O bonds. Moreover, the possible pathways of C–O ether bonds in three lignin model compounds cleavage were proposed in order to selectively obtain target products from the raw lignin degradation.
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DOI
RSC Advances
·
2015
·Vol. 5
·期 102
·84014-84021
·
IF 3.84
Shurong Wang,Haizhou Lin,Jingping Chen,Yuan Zhao,Bin Ru,Kunzan Qiu,Jinsong Zhou
5-Hydroxymethylfurfural (HMF) is a bio-based platform chemical that may be converted into various chemicals and fuels. In the present study, we developed an advanced low-boiling single-phase reaction system for producing HMF from glucose. It consists of water and 1,2-dimethoxyethane (DMOE) and uses AlCl3 as catalyst. Our results show that introduction of DMOE can substantially enhance HMF production because of the polar aprotic solvent effect provided by DMOE. Under optimal conditions, a high HMF yield (58.56%) was obtained. GC-MS of the liquid-phase products revealed that HMF and furans comprised 80% and ∼90% of the detected products. Formation of liquid-phase products, including furans, oxygenated aliphatics, cyclopenten-1-ones, and pyrans is discussed. Further study of the humins formed during glucose conversion showed the effective inhibition of humin formation by DMOE. The structure of humins was characterized by FTIR spectroscopy. Finally, HMF production from disaccharides (sucrose, maltose and cellobiose) and polysaccharide (cellulose) using the water–DMOE system resulted in good yields, demonstrating that our single-phase water–DMOE solvent system has good potential use in HMF production from glucose and complex carbohydrates.
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高影响因子
RSC Advances
·
2014
·Vol. 5
·期 5
·3792-3798
·
IF 3.708
Chao Qi,Ying-Jie Zhu,Guan-Jun Ding,Jin Wu,Feng Chen
In this paper, we report a simple and green strategy for the synthesis of hydroxyapatite (HAP) nanostructures with various morphologies (including nanoparticles, microtubes, nanorods and nanorod-assembled flower-like hierarchical structures) using adenosine 5′-monophosphate sodium salt (AMP) as an organic phosphorus source by solvothermal treatment in different solvents. The effects of the solvents and the reaction time on the morphology of the product as well as the formation mechanism of HAP nanostructures are investigated. In this strategy, the AMP biomolecules act as an organic phosphorus source for the formation of HAP nanostructures, and the solvents have effects on the morphology of the product. This strategy is environmentally friendly and surfactant-free. The as-prepared products are characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG).
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DOI
高影响因子
Microbiology Spectrum
·
2025
·
IF 3.8
Xiaojuan Tan,Jingjing Xiao,Qianqian Liu,Ting Yang,Dandan Feng,Ruyi Zheng,Liping Luo,Xi Cheng,Dongsheng Du,Minghui Li,Jinwei Zhou,Guoping Zhu
Several key virulence factors of Pseudomonas aeruginosa are regulated by quorum-sensing systems, small noncoding RNAs (sRNAs), and environmental stress, leading to a high mortality rate. Our previous studies indicated that the alkaline phosphatase LapA regulated P. aeruginosa PAO1 biofilm formation in a chronic wound model established with ex vivo porcine skin explants. Notably, one particular sRNA located upstream of the lapA gene was highly expressed in the model. Therefore, the sRNA was further characterized via northern blotting and rapid amplification of cDNA ends. The results revealed that the sRNA we named LapS is 197 nucleotides in length and is derived from the 5´ UTR and sequence internal to the lapA gene. Next, LapS mutation, overexpression, and complementation strains were constructed from the PAO1 strain, and phenotypic experiments associated with lapA were performed and compared with those of the ΔlapA and wild-type strains. The results indicated that LapS is involved in regulating swarming motility, rhamnolipid and alkaline phosphatase production, las/rhl quorum-sensing systems, and biofilm formation by controlling the level of lapA mRNA under phosphate-depleted conditions. Therefore, this LapS-lapA signaling cascade is beneficial for balancing the virulence regulation of P. aeruginosa. Additionally, an in vitro study indicated that LapS directly and post-transcriptionally regulated at least one unlinked gene, putA, which encodes bifunctional proline dehydrogenase, a virulence factor of P. aeruginosa. Collectively, our findings reveal a previously unstudied regulatory sRNA and advance the understanding of the roles of sRNAs in the pathogenicity of P. aeruginosa.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Rongjiao Sun,Limei Zhu,Xianzhu You,Rong Chen,Jiante Li,Rongrong Pan,Yueqi Jin,Hua Zhou,Ying Tan,Jiajia Dong,Wanle Hu
5-Aminosalicylic acid (5-ASA) is widely used in the clinical treatment of ulcerative colitis (UC), but its effectiveness is limited by poor patient compliance and inadequate drug retention. Herein, a novel thermoresponsive nanogel (P(NVCL-co-GelMA)) was synthesized through the copolymerization of N-vinylcaprolactam (NVCL) and methacrylated gelatin (GelMA). This nanogel serves as an effective carrier for 5-ASA, transitioning from a sol to a hydrogel at physiological temperatures, thereby enhancing drug retention and reducing leakage. In vitro studies revealed that the nanogel has a lower critical solution temperature of approximately 34 °C and can form a gel within 60 s. It demonstrates superior bioadhesion, biocompatibility, and controlled release of 5-ASA. In a rat model of UC, the 5-ASA-loaded nanogel significantly improved weight loss and disease activity index scores compared to untreated rats. The hydrogel coating acts as a biophysical barrier on the intestinal mucosa, effectively blocking the irritation caused by metabolites and maximizing the therapeutic effect, comparable to that of commercial mesalazine enema (Salofalk). The P(NVCL-co-GelMA) nanogel represents a promising drug delivery system for the treatment of UC, offering extended drug retention, reduced leakage, and enhanced therapeutic efficacy.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Deyu Si,Meihua Zhu,Xinmei Sun,Miao Xue,Yuqin Li,Ting Wu,Tian Gui,Izumi Kumakiri,Xiangshu Chen,Hidetoshi Kita
The formation progress of the high aluminum ZSM-5 zeolite membrane was investigated and characterized with the organic template-free and fluoride-containing initial synthesis gel. The nano spherical Silicalite-1 seed crystals were dissolved into amorphous by the fluoride-containing precursor synthesis gel. The amorphous contained elementary structural units (TO 4 ) and isolated five-membered ring structure of MFI zeolites. These were retained to provide the nucleation sites for high aluminum ZSM-5 zeolite. The ZSM-5 zeolite nucleus was grown into fine needle-like ZSM-5 zeolites, which were gradually grown into twin crystals, aggregation and compact ZSM-5 zeolites layer on the support without the organic template initial synthesis gel. In addition, the high aluminum ZSM-5 zeolite membranes kept the identical morphology and structure for separation of high concentration acetic acid (H 2 O/HAc) or inorganic acid (1 M H 2 SO 4 ) aqueous mixtures by XRD, SEM and NMR characterization. Furthermore, the membrane had a good dehydration performance and acid-stability by pervaporation. The flux and separation factor of the membrane for 10 wt% H 2 O/HAc mixtures were 0.98 kg∙m −2 ∙h −1 and 3200 at 348 K, respectively.
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DOI
高影响因子
危险品化学品经营许可证（带存储）