Biomass Conversion and Biorefinery
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2022
·Vol. 13
·期 18
·17247-17254
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IF 4.05
Wang Wei,Zhang Zhe,Wang Min
The electrochemical catalytic oxidation of 5-hydroxymethylfurfural (HMF) derived from biomass to produce 2,5-furandicarboxylic acid (FDCA) has attracted significant attention. Herein, the catalyst NiO-N/C composite was prepared and showed high activity for the electrochemical oxidation of HMF. The optimized NiO-N/C composite electrode supported by foamed nickel exhibits 99% conversion of HMF, 84% yield of FDCA, and 96% faradic efficiency. The NiO-N/C composite electrode is stable and remains active after six consecutive measurements. This work provides an effective method for the design and preparation of biomass energy electrocatalysts based on nitrogen-modulated NiO materials.
研究领域:
电化学
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催化材料科学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 4
·704-711
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IF 3.1
Zheng Mingdan,Chen Ya,Liu Zhan,Lyu Jiamin,Ye Bo,Sun Ming-Hui,Chen Li-Hua,Su Bao-Lian
Hollow zeolite microspheres have recently attracted much attention for their applications in catalysis, microreactors and biomedicine. Herein, we present hierarchically structured zeolite ZSM-5 microspheres with unique, abundant macropores that allow more efficient use for catalysis. The hierarchically macroporous zeolite ZSM-5 microspheres are synthesized under the assistance of water/oil emulsions and using polystyrene nanospheres as templates. The zeolite microsphere is assembled by uniform hollow zeolite nanospheres. Their large inner cavities and thin zeolite shells lead to smaller diffusion channel and higher improved accessibility to active sites, contributing to high catalytic performance in the catalytic conversion of benzyl alcohol in mesitylene. Such novel zeolite microspheres with impressive performance will be applied to numerous other industrial catalytic reactions.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2018
·Vol. 22
·期 3
·129-135
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IF 3.081
Zhang Di,Zhao Yun-Peng,Fan Xing,Liu Zhong-Qiu,Wang Rui-Yu,Wei Xian-Yong
A series of Ni/HZSM-5 catalysts with different Ni-loadings and Si/Al ratios were prepared by incipient wetness impregnation and employed for catalytic hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL). Their physicochemical properties were characterized by X-ray diffraction, nitrogen adsorption–desorption, X-ray photoelectron spectrometer, temperature-programmed desorption of ammonia,transmission electron microscopy, temperature-programmed reduction of hydrogen, and pyridine-adsorbed infrared spectroscopy. The diffraction peaks assigned to Ni phase were not observed, implying that nickel particles were small and had a high dispersion on the supports. The catalysts with a strong acidity and the appropriate ratio of Brönsted (B) acid sites to Lewis (L) acid sites (B/L = 4.9) show an excellent activity and selectivity for the hydrogenation of LA to GVL. High conversion of LA and selectivity towards GVL were achieved over 5 wt% Ni/HZSM-5-50. The maximum GVL yield of 100% over 5 wt% Ni/HZSM-5-50 was obtained under the optimized reaction conditions of 210 °C, 2 h, and 3 MPa initial hydrogen pressure.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2025
·
IF 2.3
Zhu Mengxuan,Li Hongqing,Wang Xin,Wang Longyang,Wang Rui,Jiang Heng,Jin Changzi
Design of efficient metal-acid bifunction catalysts is of significance for development of hydroisomerization of linear alkanes. In this study, the spatial configurational construction of Pt-ZSM-5 catalytic system was achieved by fabrication of acidic ZSM-5 zeolite and mesoporous silica core-shell composites equipped with controlled location of Pt sites, which aim to explore the effect of functional sites proximity on isomerization reactivity. A series of characterization techniques such as X-ray diffraction, transmission electronic microscopy, N 2 physical adsorption, NH 3 temperature programmed desorption, X-ray photoelectron spectroscopy and so on had confirmed that the synthesized core-shell bifunctional catalysts with different Pt location possessing similar textural, acid and metal properties. In the catalytic hydroisomerization of n -heptane, however, the catalyst with Pt sites locating at acid zeolite exhibits superior n -heptane conversion and isomerization selectivity, which indicates that proximity of active sites at atomic scale may be more conducive to their synergistic effect when the diffusional limitation from zeolitic channel is minimized. These results had presented new direction for the preparation of efficient bifunctional catalysts in hydroisomerization of linear alkanes.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 22
·期 3
·577-584
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IF 1.108
Zhao Xinhong,Wen Juanjuan,Zhao Jiangbo,Li An,Li Guixian,Wang Xiaolai
Hierarchically structured SAPO-5 molecular sieve was synthesized by microwave-assisted ionothermal method in eutectic mixture solvent. Their porous texture and acid properties were characterized by nitrogen physisorption, SEM, TEM and NH 3 -TPD. The results show that the mesoporous volume of SAPO-5 can be tuned via simply varying the degree of supersaturation, the type of mineralizer or replacing partly succinic acid with sebacic acid. A lower degree of supersaturation and using ammonium fluoride as a mineralizer favor the synthesis of SAPO-5 with large mesoporous volume. Notably, the introduction of sebacic acid can lead to three-level micro-meso-macroporous structure (sample C1). Five typical samples were selected as catalysts and tested in the alkylation of benzene with benzyl alcohol. Among all catalysts, the sample C1, whose aspect ratio is the lowest, exhibited the best catalytic activity, giving a 91 % benzyl alcohol conversion. The diffraction peak intensity ratio of I 002 /I 100 was proposed to be a good indicator in fabricating a highly active SAPO-5 catalyst for this reaction.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 150
·期 12
·3505-3513
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IF 2.482
Zhang Huifa,Geng Tong,Zhang Huixian,Cao Fahai
Abstract 5-Hydroxymethylfurfural (HMF) is mainly produced by dehydration of hexasaccharides which were limited by the source availability and low yield of the process. Accounting to this, the current study was thus designed to first identify the mesoporous niobium phosphate was a tailored catalyst and further to develop a suitable reaction system for hydroxymethylation of furfural to HMF. The mesoporous niobium phosphate was prepared by a two-step sol–gel hydrothermal method used to catalyze this hydroxymethylation reaction either in a pure water solvent or in an aqueous organic solvent system. Detailed investigation on reaction activity and HMF selectivity was carried out by varying reaction conditions. A highest HMF yield of 51.1% was obtained with a 79.2% furfural conversion under the aqueous dimethyl sulfoxide (DMSO) at 90 °C for 20 h over the current catalyst. Moreover, the mesoporous niobium phosphate could be recovered and reused at least for 6 runs without obvious loss in catalytic activity. Grpahic Abstract Mesoporous niobium phosphate was synthesized by a two-step sol–gel hydrothermal method and firstly investigated for the catalytic hydroxymethylation of furfural to HMF. The results suggest that mesoporous niobium phosphate shows a superior activity and selectivity. The highest yield of 51.1% of HMF was obtained with a 79.2% furfural conversion. The excellent catalytic performance could be attributed to attributed to the strong acid sites and larger porous structure in the catalyst.
研究领域:
化学工程
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催化剂科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yu Zhao,Jun Xu,Jing Wang,Jinglan Wu,Meizhen Gao,Bin Zheng,Hong Xu,Qi Shi,Jinxiang Dong
The objective of this work is to study the adsorptive separation of the biomass-derived furfural (Fur) and 5-hydroxymethylfurfural (5-HMF). Because Fur and 5-HMF have similar ellipsoidal shapes, the diffusion of the larger 5-HMF may be blocked by the elliptical window of adsorbents. Thus, two zeolitic imidazolate framework (ZIF) materials with the identical chemical composition, MAF-6 and MAF-5, were used as spherical and ellipsoidal pore adsorbents, respectively. In the dynamic column adsorption of a binary-component system (Fur/5-HMF, 5/5 wt %) in an aqueous solution, the adsorption amounts of Fur on MAF-6 display a 13% decrease compared with the single-component system, whereas the adsorption amounts of Fur on MAF-5 are identical to those obtained in the single-component system and the amounts of adsorbed 5-HMF are almost negligible. Thus, the Fur/5-HMF selectivity is only 6.4 for MAF-6, whereas the selectivity reached 115.8 for MAF-5. The results show that the narrow elliptical window/ellipsoidal tile of MAF-5 enhanced separation selectivity compared with the larger circular window/spherical cage of MAF-6. In addition, the general rate model and density functional theory calculations further verify that the elliptical window of MAF-5 exhibits a strong mass-transfer barrier that must be overcome for the diffusion of the larger 5-HMF molecules.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2024
·
IF 2.5
Zhang Yanting
Both seed solution and Cetyltrimethylammonium bromide(CTAB) serve as common template agents in the synthesis of hierarchical ZSM-5 zeolites. However, their specific roles in the synthesis process have not been clearly understood. In this study, hierarchical ZSM-5 zeolites were successfully synthesized using a 1.5% mass fraction (relative to the silicon source) seed solution in combination with varying amounts of CTAB. The physical and chemical properties of the hierarchical ZSM-5 zeolites were characterized using X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), low-temperature N 2 adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG), ammonia temperature-programmed desorption (NH 3 -TPD), pyridine-IR, and 2,4,6-collidine-IR. The investigation revealed that the CTAB content significantly influenced the synthesis of hierarchical ZSM-5 zeolites, with CTAB contributing to framework filling, charge balancing, and acting as a mesoporous template during the synthesis process, while the seed solution primarily served as a structure-directing agent. Moreover, utilizing the conversion of C8 aromatic hydrocarbons as a probe reaction, it was demonstrated that ZSM-5 zeolites synthesized with the co-assistance of seeds and CTAB exhibited enhanced conversion for ethylbenzene and m-xylene compared to samples synthesized exclusively with a seed solution.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 66
·41546-41551
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IF 3.108
Haosheng Xin,Tingwei Zhang,Wenzhi Li,Mingxue Su,Song Li,Qun Shao,Longlong Ma
In this work, glucose was transformed into 5-hydroxymethylfurfural (HMF) and 5-ethoxymethylfurfural (EMF) in the presence of AlCl3·6H2O and a Brønsted solid acid catalyst (PTSA–POM). GVL (γ-valerolactone)–water and ethanol–water solvent systems were evaluated in the dehydration reaction of glucose into HMF and EMF, respectively. Water content and dosage of AlCl3·6H2O were examined in the conversion of glucose into HMF, and some valuable chlorides (FeCl3·6H2O, NiCl2·6H2O, CrCl3·6H2O etc.) were also used in contrast with AlCl3·6H2O. Some different organic solvents were added to the ethanol–water system to explore whether it would be beneficial to the generation of EMF. A high yield of HMF (60.7%) was obtained at 140 °C within 60 min in GVL–water (10 : 1) solvent system, and total yield 42.1% of EMF and HMF (30.6% EMF, 11.5% HMF) was achieved at 150 °C after 30 min in an ethanol–water (9 : 1) solvent system.
研究领域:
化学工程
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催化反应
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DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 7
·3843-3851
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IF 3.809
Hu Hui-Chao,Zhang Yu,Zeng Tong,Zhou Weining,Chen Lihui,Huang Liulian,Ni Yonghao
This paper reports a robust method for rapid determination of cellulose derived 5-hydroxymethyl-2-furfural (5-HMF) in biomass hydrolysate suspension based on headspace gas chromatography (HS-GC). The headspace equilibration at 150 °C for longer than 4 min with a pH range of 2.0–3.5 and a 50% (v/v) of ethanol content can obtain the full evaporation of 5-HMF, and eliminate the formation of additional 5-HMF generation from hexose. The linear GC response of 5-HMF was achieved by controlling the sample size within 20 μL. The results showed that this method has a good precision (relative standard deviation < 6.97%) and accuracy (recoveries ranged from 94.0 to 104.8%). The limit of quantification of the method was 51 mg/L. It was also found that a considerable amount of furfural (13.8%) and 5-HMF (18.7%) was adsorbed on condensed lignin and humins in residual biomass, and the washing procedure with ethanol can completely extract the adsorbed furfural and 5-HMF. The present method is accurate, simple, and robust, it will be a powerful tool for determining the content of 5-HMF in the liquid samples from biorefinery related processes.
研究领域:
分析化学
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生物能源
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DOI
高影响因子
Journal of Energy Chemistry
·
2015
·
IF 2.352
Xianxiang Liu,Hui Ding,Qiong Xu,Wenzhou Zhong,Dulin Yin,Shengpei Su
A mild and simple process for the effective oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) has been developed using NaNO 2 as the oxidant. Some important reaction parameters were investigated to optimize the oxidation of HMF into DFF. It was found that the reaction solvent was very crucial for this reaction. Trifluoroacetic acid was the best solvent for the oxidation of HMF into DFF by NaNO 2 . Under the optimal reaction condition, almost quantitative HMF conversion and high DFF yield of 90.4% were obtained after 1 h at room temperature.
研究领域:
化学工程
·
有机化学
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催化
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产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·19-31
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IF 2.496
Ge Lin,Wei Jianwen,Geng Linlin,Chen Siqi,Liao Lei
An amine-modified ZSM-5/SBA-16 (ZS) micro-/mesoporous composite was synthesized for CO 2 capture using nonionic tri-block copolymer pluronic (F127) as a template, tetraethyl orthosilicate (TEOS) as a silicon source and ZSM-5 zeolite as part of silicon aluminum source by embedding method. The amine-bifunctionalized samples were prepared by first grafting with aminepropyltriethoxysilane (APTES) and then impregnating with different concentrations of tetraethylenepentamine (TEPA). The amine efficiency, adsorption kinetics, thermal stability, regeneration performance and the effects of impregnated amine loadings (30–60%) and temperatures (30–90 °C) on the CO 2 adsorption performance were investigated using a thermal gravimetric analyzer (TGA) in the mixed gases (15 vol% CO 2 and the balance of N 2 ). The best adsorbent after modification of ZSM-5/SBA-16 composite material was screened to study CO 2 adsorption mechanism and adsorption kinetics. With the increase of the TEPA amount, the adsorption capacity of amine-bifunctionalized material first increased and then decreased. At 90 °C, the bifunctionalized ZSM-5/SBA-16 displayed the highest CO 2 adsorption performance of 1.630 mmol/g at the TEPA loading of 55%. The CO 2 adsorption mechanism of the bifunctionalized material was the synergistic effect of physical adsorption and chemical adsorption. After five adsorption/desorption cycle regenerations, the saturated adsorption capacity of the composite material was 1.496 mmol/g, which was only 8.2% lower than the original adsorption capacity. The composites exhibited good CO 2 adsorption performance, indicating the promising industrial applications for CO 2 capture form actual flue gas after desulfurization.
研究领域:
材料科学
·
环境工程
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）