JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Mu-Ying Guan,Chang-Ying Hu,Qi-Shan Peng,Ying Zeng,Wen-Wei A.,Ze-Chun Wu,Zhi-Wei Wang,Huai-Ning Zhong
Bamboo sticks intended for food contact can produce 5-Hydroxymethylfurfural (5-HMF) and Furfural (FF) when used in high-temperature scenarios (e.g., barbecue and Kanto boil). The influencing factors in terms of baking conditions, salinity, pH, and dipping time of water on the formation of 5-HMF and FF in bamboo sticks were investigated. Specific migration of 5-HMF and FF also have been studied in bamboo sticks in contact with food simulants (water, 10 % ethanol, and 4 % acetic acid). The results showed that the effects of baking temperature and time on the formation of both showed a similar pattern which firstly increased and decreased afterward. Both 5-HMF and FF levels in bamboo sticks increased with decreasing pH and the presence of salt. After dipping bamboo sticks in water for a while, the moisture content of higher than 10 % in bamboo sticks presented low levels of 5-HMF and FF. In the case of all food simulants, the highest migrated concentration of 5-HMF and FF were found in 4 % acetic acid. Since there are no specific migration limits for 5-HMF and FF, estimated daily intake is calculated to evaluate their safety. Based on the studied migration results, 5-HMF and FF in bamboo sticks are relatively safe for consumers.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 13
·期 2
·457-467
·
IF 6.177
Yucheng Li,Liyu Zhu,Jingyang Zhao,Mengjie Qiu,Jing Liu,Jing He,Luying Wang,Jiandu Lei,Weiqian Tian,Long Rong
A high-efficiency nickel–iron bimetallic catalyst (Ni3Fe1 alloy) was synthesized by a facile solvothermal reaction and directly used in furfural hydrogenation without pre-reduction. When the total metal acetate was 6 mmol (Ni : Fe = 4 : 2) with 2 mmol sodium acetate under reaction conditions of 1 MPa H2 pressure at 130 °C for 1 h, the conversion for furfural and selectivity for furfuryl alcohol were both more than 98%. XRD, BET, H2-TPD, SEM, HRTEM, EDS, ICP-MS and ex/in situ XPS were used to characterize the catalysts. Compared to the monometallic Ni catalyst, the introduction of Fe not only enhanced the hydrogen adsorption capacity of Ni but also forms NiFe2O4 on the surface of the catalyst to protect the internal crystals from further oxidation and maintain hydrogenation ability. Moreover, the introduction of Na increased the purity of the Ni3Fe1 crystal of the catalyst and reinforced the interaction between Ni and Fe, resulting in an improvement in hydrogenation performance. Based on density functional theory (DFT) calculations, the reaction mechanism was systematically investigated. The results of five recycling tests show excellent catalyst stability. The environmentally friendly synthetic process, high stability, catalytic efficiency and the ability to function without a pre-reduction step make the nickel–iron bimetallic catalyst an ideal, commercial candidate for the furfural hydrogenation reaction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wanling Xu,Chunjie Yu,Jinzhu Chen,Zhiyong Liu
Electrochemical hydrogenation (ECH) is a particularly important and environmentally friendly approach to obtain biomass-based fuels and high value-added fine chemicals without using external hydrogen. Herein, we reported a highly efficient and selective ECH of furfural (FF) into furfuryl alcohol (FA) with Cu-based electrocatalyst in aqueous alkaline media. Under the optimal conditions, FA selectivity close to 100% with 99% FF conversion and total Faradaic efficiency above 95% were obtained with the electrocatalyst. Mechanism investigation suggests an ECH mechanism for FA formation, which is highly potential-dependent to FA selectivity, requiring low and well-matched concentrations between active hydrogen (H ads ) species and FA radical on the Cu surface. Moreover, the electrocatalyst shows an excellent stability and recyclability during the eight-time consecutive recycling experiments, yielding a total amount of 1011 mg FA. This work thus highlights an important guidance for electrocatalytic upgrading of biomass-based platform molecules in an environmentally friendly way.
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Molecular Catalysis
·
2022
·
IF 5.089
Weitao Wang,Xiaomei Cao,Haishun Guo,Xiufang Yang,Nianwen Guo,Yangmin Ma
The carbon-based solid acid catalyst was prepared by carbonizing lignin and polyvinyl chloride at high temperature and then sulfonating with p-aminobenzenesulfonic acid. The catalyst was characterized by FI-IR, XPS, SEM, N 2 adsorption-desorption, and acid-base titration to reveal the physical and chemical properties of the catalyst. In addition, the effects of reaction temperature, time, catalyst loading, and solvent type on transformation of xylose to furfural were also investigated. The yield of furfural can reach 84.3% from xylose in GVL solvent. In addition, five common crop wastes of corn cob, corn stalk, rice straw, rice husk, and wheat straw are employed as the substrates over the as-prepared solid acid to investigate the catalytic performance. Satisfied yield of furfural from corn cob and rice husk are achieved. The results show that the prepared solid acid has good catalytic performance for the reaction of furfural production from biomass.
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高影响因子
FUEL
·
2022
·
IF 8.035
Qiuju Fu,Dandan Liu,Weijing Niu,Shuo Zhang,Ruihua Chen,Yujia Wang,Pengze Zhao,Huimin Jiang,Yanchao Zhao,Lingzhi Yang,Liting Yan,Haiyan Wang,Xuebo Zhao
The highly efficient production of furfuryl alcohol (FFA) from biomass-derived furfural (FFR) is attracting increasing attention due to its wide application in the production of value-added chemicals. Zr-based MOF-808 is promising for liquid catalytic transfer hydrogenation (CTH) of FFR to FFA in terms of possessing a great number of Lewis-acid sites. Herein, a series of defective MOF-808 (D x -MOF-808) samples were prepared via a competitive coordination-removal strategy by modulating with benzoic acid (HBC). HBC was introduced as the temporary ligand for competing with formal ligand 1,3,5-benzenetricarboxylic acid (H 3 BTC) to coordinate with metal clusters and then it was removed with methanol to obtain the D x -MOF-808. The results showed that HBC serves not only as a temporary ligand participating in the synthesis of MOF-808 to obtain defective structure but also as a modulator controlling the particle size by terminating the growth of crystals. By changing the amount of HBC addition, the degree of ligand deficiency and the number of exposed Zr sites can be well regulated. Especially, excellent performance of FFR conversion (99%), FFA selectivity (94.4%) and FFA formation rate (48.6 mmol·g −1 ·h −1 ) was achieved over D 40 -MOF-808 sample with 2-propanol as a hydrogen donor under mild conditions (90 °C, 2 h), ranking it the best among the reported catalysts. Detailed characterizations proved that the high activity of D 40 -MOF-808 was jointly influenced by the high surface area, the high content of exposed Zr metal sites and ligand deficiency.
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BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Shanta Dutta,Qiaozhi Zhang,Yang Cao,Chunfei Wu,Konstantinos Moustakas,Shicheng Zhang,Ka-Hing Wong,Daniel C.W. Tsang
Lignocellulosic paper waste constitutes a major waste stream globally, which should be valorised for chemical production. However, paper properties ( e.g. , feedstock composition, cellulosic crystallinity, and thermal stability/degradability) vary with raw materials and pulping processes. This study investigated levulinic acid (LA), hydroxymethylfurfural (HMF), and furfural production by H 2 SO 4 and FeCl 3 catalysed conversion of nine types of paper wastes in a green solvent system (1:1 γ‐valerolactone/water). At 160–180 °C for 1–20 min, ∼23–27 wt% LA yield was achieved from sanitary papers, tracing/parchment paper, and paper food box mainly containing crystalline cellulose, while a lower LA yield (∼10–20 wt%) was obtained from other paper wastes with high contents of ash and lignin. A higher selectivity towards HMF (∼12 mol%) was achieved in the presence of FeCl 3 . A furfural yield of ∼ 4–7.5 wt% was also obtained from the hemicellulose content. This study elucidates crucial factors and desirable characteristics of paper waste for catalytic valorisation.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2513-2526
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IF 3.186
Cui Kai,Qian Wei,Shao Zhengjiang,Zhao Xiuge,Gong Honghui,Wei Xinjia,Wang Jiajia,Chen Manyu,Cao Xiaoming,Hou Zhenshan
Furfural (FFR) is one of the most important biomass-derived chemicals. Its large-scale availability calls for the exploration of new transformation methods for further valorization. Herein, we demonstrate that Ru nanoparticles (Ru NPs)-supported on a sulfonated carbon layer coated SBA-15 can be employed as an efficient bi-functional catalyst for one step conversion of FFR into 1,4-pentanediol (1,4-PeDO). The optimum bi-functional catalyst can afford the full the conversion of FFR and 86% selectivity to 1,4-PeDO. The catalysts have been characterized thoroughly by using a complementary combination of powder X-ray diffraction, N 2 adsorption–desorption, scanning/transmission electron microscopy, Fourier transform infrared spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy. The characterization revealed that acidic groups (–SO 3 H) have been introduced on the surface of the carbon layer coated SBA-15 support after sulfonation with 98% H 2 SO 4 and the surface acidity can be tuned facilely by the sulfonating time. Meantime, Ru(0) sites was highly dispersed via an impregnation and sequential reduction and directly adjacent to the surface –SO 3 H group. There existed an electronic interaction between Ru(0) sites and sulfonic groups, in which the electronic transfer from sulfonic sites to Ru(0) sites occurred. Brönsted acid sites (–SO 3 H) have a significant influence on the FFR conversion and the selectivity to 1,4-PeDO. The ordered mesoporous structure, the appropriate density of acid sites and the electron-rich Ru(0) sites accounted for the the excellent performance of the catalyst for an efficient production of 1,4-PeDO from FFR. Graphic Abstract
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ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Heng Ban,Youdi Zhang,Shuaibo Chen,Youwei Cheng,Teng Pan,Lijun Wang,Xi Li
In this contribution, readily available 5-methyl furfural (MF) derived from biomass was used as an excellent substitute of the chemically unstable 5-hydroxymethylfurfural (HMF) for preparing the commercial precursor 2,5-furandicarboxylic acid (FDCA). MF was catalytically oxidized by air into FDCA in acetic acid over homogeneous Co/Mn/Br catalysts at 130–170 °C. It was found that both the substitute reactivity and the ring chemical stability have a remarkable impact on the yield of aromatic dicarboxylic acids. The effects of reaction temperature, pressure, catalyst composition and concentration, water concentration in the solvent, and substrate/solvent mass ratio on both the main reaction and the side reaction were investigated systematically and thoroughly using HPLC and an online tail gas monitoring system. Under optimized conditions, the oxidation of MF gave 100% conversion of MF and 75.8% yield of FDCA with 99.6% purity. It was also proven that the addition of 200 ppm cerium could work well at low temperatures (130–140 °C) for enhancing FDCA selectivity via suppressing the side reactions.
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APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Mingwei Ma,Pan Hou,Peng Zhang,Jingjie Cao,Hui Liu,Huijuan Yue,Ge Tian,Shouhua Feng
Magnetic Fe 3 O 4 -12 nanoparticles, an easily separable heterogeneous catalyst, exhibits high catalytic performance in the catalytic transfer hydrogenation (CTH) reaction of biomass-derived furfural (FAL) to furfuryl alcohol (FOL) with 2-propanol (2-PrOH) as the hydrogen source (90.1 % FOL yield at 160 °C for 5 h). Comparing Fe 3 O 4 nanoparticles with different particle sizes found that the smaller the nanoparticles, the larger the BET surface area, pore volume and pore diameter, resulting in more acid-base active sites through BET, SEM, TEM, NH 3 -/CO 2 -TPD and other characterizations. Moreover, a scaled-up CTH experiment of FAL and a stepwise reaction from xylose to FOL verified that the catalytic system has great industrial application prospects. A feasible flowchart of the chemical process from xylose to FOL was designed, which can realize the regeneration of biomass resources (xylose derived from corncob), the reuse and recycling of catalysts and solvents, and minimize the amount of solvents and pollutant emissions.
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ENERGY & FUELS
·
2019
·
IF 3.021
Mingxue Su,Wenzhi Li,Qiaozhi Ma,Song Li,Tao Yang,Xiaomeng Dou
A water-tolerant, basic, and hierarchical MFI zeolite catalyst was synthesized and applied in the aldol condensation reaction between biomass-derived furfural and levulinic acid. The results showed that the addition of poly(diallyl dimethylammonium chloride) significantly affected the textural and acid–base properties of hierarchical zeolite, which subsequently influenced the catalytic performance of hierarchical zeolite. In the aqueous phase, potassium-modified, hierarchical MFI zeolite (K/H-MFI-n) was more active for aldol condensation between furfural and levulinic acid than the potassium-modified, conventional MFI zeolite (K/MFI). This was ascribed to higher basic sites density and improved diffusion limitation of K/H-MFI-n. A 70.6% yield of aldol condensation product was achieved with a complete conversion of furfural at 100 °C for 9 h by K/H-MFI-0.6. However, only 27.4% yield of aldol condensation product with 55.1% furfural conversion was obtained by K/MFI at the same condition. Two major isomeric aldol products, β-furfurylidenelevulinic acid and δ-furfurylidenelevulinic acid (β-FDLA and δ-FDLA), were obtained after acidification. K/H-MFI-n displayed an enhanced selectivity (54.9%) to δ-FDLA, owing to the stronger basicity of K/H-MFI-n. However, K/MFI showed a preferred selectivity to β-FDLA (42.7%), owing to the dominant Lewis acidity. Recyclability research showed that the catalytic performance of potassium-modified, hierarchical MFI zeolite was acceptable after five runs.
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CATALYSIS LETTERS
·
2026
·Vol. 156
·期 10
·282
·
IF 2.5
Ye Qihang,Zhong Zhaoping,Yang Yuxuan,Wang Wei,Jia You,Xiong Qi,Chen Huanqi,Zheng Xiang
Furfural, a key biomass-derived platform chemical, requires efficient hydrogenation for economic and research benefits. Herein, we propose a carbon-encapsulated catalyst with optimized active sites (using carbon-containing organics) for its highly selective hydrogenation. Experimental results demonstrated that carbon loading facilitated the conversion of strong acid sites to medium‑strong acid sites on the catalyst support, and also increased the Lewis/Brønsted (L/B) ratio. Through optimization of reaction conditions and carbon loading, complete conversion of furfural and a furfuryl alcohol selectivity as high as 99.17% were achieved at 160 °C for 4 h. The prepared catalyst maintained high furfuryl alcohol selectivity even after five cycles, owing to the protective carbon layer on the active support and the well-dispersed Cu species on its surface. DFT calculations further revealed that furfural preferentially adsorbs on the catalyst surface via the η¹(O)-aldehyde configuration, confirming the promotional role of the catalyst in furfural hydrogenation. Graphical
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高影响因子
FUEL
·
2023
·
IF 7.4
Shuangshuang Cen,Lijun Wang,Cong Wan,Xinyan Chai,Lei Li,Wensheng Linghu
Zr 4+ −O 2− pairs in MOFs and macromolecule − Zr(IV) complexes have proved one of the ideal catalytic components for catalytic transfer hydrogenation of biomass-derived furfural. However, restricted by limited adjustability of Zr 4+ −O 2− coordination environment and the complex design and creation of ligand defects, currently, there are only a few efficient low-temperature (<100 °C) catalytic systems. In this work, oxygenated groups enriched polyolefin − Zr(IV) complexes were prepared and fixed on/in mesoporous silica aerogel support. The complexes possessed a stable structure with C C bonds as the connecting skeleton of each oxygenated group, and the types and densities of oxygenated groups ( COOH, SO 3 H, and OH) could be easily adjusted by using different monomers. In the catalytic transfer hydrogenation reaction of furfural and 2-propanol, the catalyst synthesized using dicarboxylic maleic acid as a monomer of polyolefin exhibited the best catalytic performance in low temperatures, the main product furfuryl alcohol with a high yield of 96.0 % and a high selectivity of 98.2 % was obtained at 85 °C for 8 h. In 6 cycles of reactions at 85 °C, the furfuryl alcohol yield decreased gradually from 96 % in the 1st cycle to 84.0 % in the 4th cycle and further restored to 90.9 % and 89.3 % in the 5th and 6th cycles, respectively, by refreshing the used catalyst with methanol washing, and there was almost no leaching of Zr 4+ species in the reaction medium. The catalyst poisoning experiment with acidic and basic sites shielded by pyridine and boric acid, respectively, showed that the catalytic activity was more sensitive to the shielding of basic sites, and the isotope experiments revealed that two H of the product furfuryl alcohol are transferred from 2-propanol. Hereby, the oxygenated group-bearing polyolefin − Zr(IV) complexes with stable structure, variable functional groups and the corresponding various Zr 4+ −O 2– coordination pairs, are ideal catalyst candidates for the selective transfer hydrogenation of furfural to furfuryl alcohol.
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