APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Xiaoyuan Liu,Yu Zou,Jiang Jiang
We report selective photocatalytic partial oxidation of glycerol on bimetallic formate oxidase mimicking AuPt/TiO 2 , with a unique self-accelerating reaction kinetics discovered for the first time. Systematic investigation on the glycerol oxidation in the presence of externally added formic acid and various scavengers reveals a positive correlation between photocatalytic activity and solution H 2 O 2 level. A reaction mechanism has been put forward, where the in situ generated formic acid consumes photogenerated holes, and enables on-site H 2 O 2 production on AuPt/TiO 2 , resulting in accelerated glycerol oxidation and improved C3 product selectivity. In pH 9 borate buffer solution, C3 products selectivity of 72% (60% for glyceric acid) has been achieved at 90% glycerol conversion under AM 1.5 G irradiation for 4 h, at ambient conditions. Our findings presented here may help guiding catalyst design for the photocatalytic biomass valorization in the future.
研究领域:
催化化学
·
可再生资源转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2016
·
IF 3.958
Chen Zhang,Tao Wang,Xiao Liu,Yunjie Ding
A series of copper-promoted platinum supported on activated carbon (Cu-Pt/AC) catalysts were investigated for glycerol oxidation to lactic acid. The catalytic performance of 1.0%Pt/AC catalyst was greatly influenced by Cu loading (0.1–2.0 wt%). Among them, the 0.5%Cu–1.0%Pt/AC catalyst showed the best promotional effect, whose lactic acid yield was 2.4 times of that on 1.0%Pt/AC under same reaction conditions. Characterizations were carried out to explore the relationships between catalyst properties and reaction performances. TEM images show that the introduction of Cu improves the dispersion of Pt and Cu, and some Pt-Cu interfaces are detected by HR-TEM, which would facilitate the glycerol transformation. XPS and H 2 -TPR analyses reveal that good catalyst performance is related with not only a proper surface Pt/Cu molar ratio, but also copper species’ oxidation states. Cu + and Cu 0 species favor glycerol conversion and lactic acid production, whereas large CuO particles facilitate the formation of glyceric acid.
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2024
·
IF 2.9
Liang Heng-Yu,Xiao Yang,Gao Hao-Xiang,Zeng Wei-Cai
Ligustrum robustum (Rxob.) Blume was utilized as an natural additive to protect oil quality during the high temperature processing. L. robustum exhibited the remarkable capability to inhibit peroxide value, acid value, viscosity and color deterioration of oil. Meanwhile, L. robustum inhibited the decomposition of unsaturated fatty acids and the formation of trans fatty acids to protect the nutritional value of the oil. In addition, L. robustum increased the initial oxidation temperature of oil and raised its initial decomposition temperature. With high content of total phenols (126.9 g gallic acid equivalent /kg extract) and flavonoids (135.6 g rutin equivalent /kg extract), L. robustum showed the remarkable antioxidant and reducing capacities and was effective in scavenging free radicals and inhibiting lipid peroxidation. Furthermore, Ligurobustoside B was identified as the phenolic component in L. robustum sample with the high amount. All present results suggest that L. robustum has potential to be utilized as the natural additive for protecting oil quality during the high temperature processing. Chemical compounds studied in this article Ligurobustoside B (PubChem CID: 102,316,894).
研究领域:
食品科学
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植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2016
·
IF 7.354
Xiaomei Ning,Yuhang Li,Hao Yu,Feng Peng,Hongjuan Wang,Yanhui Yang
The group 15 metals, bismuth and antimony, play important roles in promoting noble-metal-catalyzed oxidation reactions toward high value-added chemicals. Herein, we report that the selective oxidation of glycerol to 1,3-dihydroxyacetone (DHA) catalyzed by Pt supported on N-doped carbon nanotubes (Pt/NCNT) can be significantly promoted in the presence of Bi or Sb in reaction solution. This catalyst system showed not only comparable even better performance to the Pt/NCNT with pre-loaded Bi, but also the greatly simplified catalyst preparation. It was found that the Bi-promoted Pt/NCNT underwent dynamic surface reconstruction through leaching and adsorption of Bi adatoms, due to the formation of glyceric acid. By characterizing the adsorption of Bi on Pt catalyst with high-resolution transmission electron microscopy, CO-stripping, horizontal attenuated total reflection infrared spectroscopy and X-ray photoelectron spectroscopy, it has been ascertained that Bi preferentially deposits on the step sites of Pt, and then blocks the terrace sites to promote the Pt catalyst mainly through a geometrical effect, which facilitates the activation and transformation of the secondary hydroxyl group of glycerol through the chelation between substrate and Pt–Bi sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yuxuan He,Yongming Wang,Jin Qian,Kailin Xu,Bianhe Lu,Sijing Tang,Yin Liu,Junwei Shen
Photocatalysis for H 2 O 2 production suffers from low carrier utilization and slow reaction kinetics. Herein, a photocatalytic system supported by a SrCoO 3 -MoS 2 (SCOS) heterojunction, which possessed a unique S-O electron transport channel, was proposed to facilitate H 2 O 2 production under condition where glycerol served as a sacrificial agent. The SCOS heterojunction achieved a remarkable yield of 15.90 mmol g −1 h −1 H 2 O 2 production, 3.7 times higher than the base component SCO. The construction of the heterojunction enriched the oxygen vacancies on the catalyst surface, facilitated photogenerated charge separation, and promoted the adsorption of O 2 , reducing the oxygen reduction reaction (ORR) energy barrier. Besides, glycerol served as a unique proton donor, efficiently captured holes to enhance H 2 O 2 production, and generated valuable by-products including glyceric acid and dihydroxyacetone. Furthermore, SCOS exhibited excellent stability over repeated cycles with consistent H 2 O 2 yields. This study offers an efficient photocatalytic system and demonstrates glycerol’s potential in green oxidation processes.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 12
·e17852
·
IF 4.167
Yang Zhao,Xinyi Zhang,Jiarui Yang,Mingyu Gao,Pengfei Yang,Qian Wang,Dianqing Li,Junting Feng
In this work, a commercial P25 (TiO 2 ) with phase junctions between (101) and (110) faces supported Pt catalyst was prepared for glycerol selective oxidation, giving a decent 76.8% glyceric acid (GLYA) yield, and good stability. The kinetic experiments calculated apparent activation energy, turnover frequency (TOF), and reaction rates, demonstrating Pt/P25 could facilitate glyceraldehyde (GLYAD) formation and inhibit GLYA over-oxidation. Series of structural techniques confirmed the 101/110 junctions in P25 contributed electronic effect on Pt through metal-support interface, which improved the oxygen activation ability and optimized the GLYAD/GLYA adsorption modes. Furthermore, progressive scale-up reactions were tested and the mass transfer limitations under different conditions were thoroughly studied. The obtained mass transfer factors suggested the gas–liquid and liquid–solid mass transfer were severely limited. Finally, through optimizing the conditions, Pt/P25 catalyst achieved 75.8% GLYA yield at 300 ml-scale reaction, realizing equivalent magnification with the 5 ml-scale experiment.
研究领域:
催化化学
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材料科学
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反应动力学
✓ 已验证
产品关联
DOI
高影响因子
Energy Advances
·
2023
·Vol. 2
·期 9
·1366-1374
·
IF 0
Zhengzhe Xie,Xiaoyuan Liu,Pengpeng Jia,Yu Zou,Jiang Jiang
Replacing water oxidation by the thermodynamically more favorable glycerol oxidation reaction in a photoelectrochemical (PEC) cell is highly desirable, which can not only improve the energy efficiency of hydrogen evolution, but also produce value-added chemicals, given that glycerol is easily accessible as a major byproduct from the biodiesel industry. Herein, a BiVO4/CoV-LDHs/Ag photoanode has been fabricated via a simple electrodeposition and redox strategy, which exhibits excellent PEC activity toward glycerol oxidation. A high photocurrent density of 7.15 mA cm−2 can be achieved at 1.23 V vs. reversible hydrogen electrode, in 0.5 M Na2SO4 solution with 0.1 M glycerol under AM 1.5G illumination, which is 2.7 times that of the pristine BiVO4 photoanode. The significantly enhanced PEC performance can be attributed to the narrowed optical band gap, and improved charge separation and injection efficiencies after surface deposition of CoV-LDHs/Ag on the BiVO4 photoanode. As a result, greatly improved hydrogen production efficiency has been achieved by coupling the photo-electrochemical glycerol oxidation on the BiVO4/CoV-LDHs/Ag photoanode, with the evolved hydrogen gas (123.5 mmol m−2 h−1) nearly double that when using the pristine BiVO4 photoanode.
研究领域:
材料科学
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电化学
·
可再生能源
✓ 已验证
DOI
FOOD CHEMISTRY
·
2025
·
IF 9.8
Hao-Xiang Gao,Nan Chen,Qiang He,Wei-Cai Zeng
The low solubility of phenolic compounds in oils limits their protective effect on oil quality. In the present study, novel microemulsions were designed and prepared with Ligustrum robustum (Rxob.) Blume polyphenols extract (LRE) using soybean oil as the oil phase, a combination of Tween80 and Span80 as surfactants, and ethanol as the co-surfactant, and subsequently characterized and evaluated their properties and performance in oil. Results showed that the amount of LRE dissolved in prepared microemulsions could reach 0.025 g/g oil. According to the droplet size, rheology, differential scanning calorimetry, and transmission electron microscopy measurements, LRE had no negative effects on microemulsion structure and increased the particle size, viscosity, and interfacial strength of microemulsion. Moreover, LRE exhibited remarkable antioxidant activities, and the LRE-loaded microemulsions showed no obvious cytotoxicity on Caco-2 cells. Furthermore, the LRE-loaded microemulsions exhibited superior effectiveness in inhibiting oil oxidation during storage, compared to the direct addition of LRE. All results suggest that the microemulsion has the potential used as an embedded material for natural antioxidants in food industry.
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Weijia Pu,Yuefeng Wu,Yiwei Zhang,Yahui Xiao,Yong Liu
In this paper, ultrafine PdCo nano-alloys confined in crosslinked and carboxyl-functionalized mesoporous poly(ionic liquids) catalysts (PdCo@PVCD) were synthesized for selective oxidation of glycerol into glyceric acid. The structure and physiochemical properties of the catalysts were confirmed by FT-IR, TG , XRD , BET, SEM, TEM-EDS and XPS. The results indicated that the resulting PdCo@PVCD catalyst not only exhibited superior catalytic activity for glycerol oxidation but also higher selectivity to glyceric acid than that of the monometallic Pd@PVCD catalyst, specifically glycerol conversion of 92.8% and glyceric acid selectivity of 63.5% at the optimized reaction conditions. It was confirmed that the excellent performance was attributed to the geometric effect of ultrafine and homogeneous PdCo nano-alloys and also electronic modification of Pd by Co. Moreover, the PdCo@PVCD catalyst had outstanding stability with no activity loss after five reusing times, which was benefited from the strong metal-support interaction and spatial confinement.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Liu Yang,Shang Huishan,Zhang Bing,Yan Dongpeng,Xiang Xu
The C–C bond cleavage of biomass-derived glycerol to generate value-added C1 products remains challenging owing to its slow kinetics. We propose a surface fluorination strategy to construct dynamic dual hydrogen bonds on a semiconducting BiVO 4 photoelectrode to overcome the kinetic limit of the oxidation of glycerol to produce formic acid (FA) in acidic media. Intensive spectroscopic characterizations confirm that double hydrogen bonds are formed by the interaction of the F–Bi–F sites of modified BiVO 4 with water molecules, and the unique structure promotes the generation of hydroxyl radicals under light irradiation, which accelerates the kinetics of C–C bond cleavage. Theoretical investigations and infrared adsorption spectroscopy reveal that the double hydrogen bond enhances the C=O adsorption of the key intermediate product 1,3-dihydroxyacetone on the Bi–O sites to initiate the FA pathway. We fabricated a self-powered tandem device with an FA selectivity of 79% at the anode and a solar-to-H 2 conversion efficiency of 5.8% at the cathode, and these results are superior to most reported results in acidic electrolytes.
研究领域:
材料科学
·
光电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-9
·
IF 6.232
Xie Meizhen,Jia Mengchao,Zhao Hong,Zhang Luwei
A fiber mat was developed to visually determine the oxidation of edible oils, based on the colorimetric reaction of Schiff’s reagent and aldehydes - the major volatile formed during lipid oxidation. The mixtures of polyvinyl alcohol (PVA) and Schiff’s reagent containing various amounts of glycerol were electrospun to form the fiber mats. The response of the PVA/Schiff’s reagent fiber mats to gaseous hexanal (model aldehyde) was investigated. Oxidized soybean oils were used to evaluate the effectiveness of the PVA/Schiff’s reagent fiber mat for indicating oxidation of the oils. The results showed that the fiber mats obtained had average fiber diameters of less than 100 nm. Upon hexanal exposure, the fiber mats turned from white to purple. Higher amount of glycerol led to larger color change of the fiber mats and shorter response time to hexanal. A linear relationship ( R 2 = 0.96) was observed between the color change of the mat and hexanal concentration (15–117 μmol L −1 ). The visual determination limit of the mat for hexanal was 29 μmol L −1 . The color change of the PVA/Schiff’s reagent fiber mat was increased with an increase of soybean oil oxidation. Out of the seven soybean oils tested, the PVA/Schiff’s reagent fiber mat was able to correctly indicate the oxidation states of six oils. The result suggested that the visual determination method developed is a promising method to indicate the oxidation of edible oils, which can be performed easily by non-experts. Graphical abstract
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Hongjing Wang,Wenjie Zhan,Shaojian Jiang,Kai Deng,Ziqiang Wang,You Xu,Hongjie Yu,Liang Wang
Graphical Heterostructure Ni 3 N/WO 3 nanosheet arrays loaded on nickel foam (Ni 3 N/WO 3 /NF) were synthesized by combining cation-exchange with the hydrothermal method and annealing under an ammonia atmosphere (NH 3 ). Ni 3 N/WO 3 nanosheet arrays consist of irregular particles and have abundant active sites due to the heterogeneous interface between Ni 3 N and WO 3 . Ni 3 N/WO 3 /NF was used for efficient electrocatalytic glycerol oxidation coupled to hydrogen production. Glycerol oxidation-assisted water electrolysis has emerged as a cost-effective way of co-producing green hydrogen and HCOOH. Still, preparing highly selective and stable nickel-based metal electrocatalysts remains a challenge. Herein, heterostructure Ni 3 N/WO 3 nanosheet arrays of bifunctional catalysts with large specific surface areas loaded on nickel foam (denoted as Ni 3 N/WO 3 /NF) were synthesized. This catalyst was for glycerol oxidation reaction (GOR) and hydrogen evolution reaction (HER) with excellent catalytic performance, a voltage saving of 267 mV compared to oxygen evolution reaction (OER), and a HER overpotential of 104 mV at 100 mA cm −2 . The cell voltage in the assembled GOR//HER hybrid electrolysis system reaches 100 mA cm −2 at 1.50 V, 296 mV lower than the potential required for overall water splitting. This work demonstrates that replacing GOR with OER using a cost-effective and highly active Ni-based bifunctional electrocatalyst can make hybrid water electrolysis an energy-efficient, sustainable, and green strategy for hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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