JOURNAL OF POROUS MATERIALS
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2024
·
IF 2.5
Shi Xiang,Wang Ke,Wang Minxin,Yuan Hong
UiO-66 specimens having different acetic acid/ZrCl 4 molar ratios were prepared and pyrolyzed to ZrO 2 as supports for Pt and Ni, intended to catalyze the decarboxylation of oleic acid. Brunauer-Emmett-Teller surface area analyses, NH 3 temperature-programmed desorption and pyridine adsorption infrared spectroscopy showed that the material made using an acetic acid/ZrCl 4 molar ratio of 100 (ZrO 2 -100) had the largest specific surface area, acid amount and acid strength values. The yield of C 8 -C 17 alkanes obtained from Ni/ZrO 2 -100 exceeded that provided by Pt/ZrO 2 -100 because the latter possessed more acidic sites than the former, which excessively cracked long-chain hydrocarbons. The 1 wt% Ni/ZrO 2 -100 catalyst showed the best catalytic performance, with 96.4% conversion of oleic acid and an 80.6% yield of C 8 -C 17 alkanes after 4 h at 340 °C under a CO 2 atmosphere at a pressure of 18 bar. The conversion of oleic acid remained almost unchanged after 4 reuses of this catalyst whereas the yield of C 8 -C 17 alkanes decreased to 66.7%. This result is attributed to a loss of acidic sites and an increase in carbon build-up.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jun Jiang,Teng Li,Kexin Huang,Guangyu Sun,Jing Zheng,Jinlong Chen,Weiran Yang
As a bio-based platform chemical, it is desirable to convert levulinic acid (LA) to varieties of value-added biochemicals. n-Butane, mainly from nonrenewable fossil resources, is a basic chemical to produce some important chemicals, such as butadiene and ethylene. In this paper, 95.5% yield of n-butane was obtained from LA in one-step over base-treated Pt/C at around 300 °C in 4 h. The reaction pathway was confirmed to be the hydrodeoxygenation of LA to valeric acid (VA) and then the VA decarboxylation to n-butane by kinetic studies. Base-treated Pt/C had better reactivity due to its improved decarboxylation activity. Detailed characterization of the catalyst revealed that the Pt particle size is the key reason for the activity improvement, and further studies showed that Pt nanoparticles with a size of 2–4 nm showed the highest decarboxylation activity. This is the first report on the direct conversion of LA to n-butane.
研究领域:
化学工程
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可再生资源
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催化科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 23
·2266-2276
·
IF 3.532
Huan Zhang,Qi Guan,Pei Zeng,Guoqiang Wu,Yanping Hong,Wuying Yang,Chunrong Wang
In the present study, a novel simple and sensitive method was developed for the determination of pectin based on the decarboxylation derivatization reaction and surface-enhanced Raman scattering (SERS) without complicated separation steps. The derivatization reaction can be controlled by the experimental parameters such as reaction time, temperature and the amount of hydrochloric acid. Additionally, the method was used to accurately and reliably detect pectin added in honey or apple, which can be detected at levels as low as 0.5 or 0.01 ppm, respectively. Based on the conventional decarboxylation reaction, a simple and sensitive SERS method was proposed for the detection of pectin, which shows potential for practical application.
研究领域:
食品科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Rui Zhu,Yaxin Wang,Minshu Cui
A strategy for the photocatalytic conversion of α-amino acids into corresponding amides was developed. A series of carbon nitride samples were prepared as the catalyst. Various characterizations of the catalyst indicated that effective photocatalytic activity and low recombination efficiency of photo-generated carriers were significant for the high activity of the catalyst. Reaction conditions for the photocatalytic decarboxylation of α-amino acids were optimized, alongside an investigation into the potential mechanism through controlled experiments and DFT computations. Mechanism studies unveiled that photo-generated electrons activated O 2 to reactive oxygen species, while photo-generated holes induced the decarboxylation reactions by activating the carboxylic acid groups, generating carbon radicals that ultimately lead to the formation of corresponding amides under the influence of reactive oxygen species. Moreover, the photocatalytic decarboxylation of different alpha amino acids was also discussed, providing new strategies for the formation of amides and lactams.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Qin Zeng,Jie Wang,Ligang Luo
The lipid-derived carboxylic acids are promising for renewable hydrocarbons, which are alternatives to fossil fuels. In this work, we studied a promising method for obtaining long-chain alkanes from palmitic acid, a model compound for biomass microalga, through decarboxylation under non-hydrogen conditions. Under hydrothermal conditions, it was found that the smaller the Ni particle size, the higher the yield of long-chain alkanes obtained. When the Ni particle size of Ni/ZnO/AlOn-500 reaches 6.5 nm, the highest yield of long-chain alkane is 54.2 mol %. The catalyst recycling experiment showed that the decarboxylation yield of the catalyst recycled twice would decrease. Through XRD analysis of the catalyst, it was found that the particle size of Ni in the catalyst increased significantly after the decarboxylation reaction. This may be the main reason for the decrease in the yield of long-chain alkanes after the catalyst was recycled. In the end, a possible reaction mechanism was proposed by studying the distribution of the reaction products.
研究领域:
化学工程
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可再生能源
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2020
·Vol. 16
·期 8
·1211-1219
·
IF 2.831
Liao Wanfeng,Ni Xiuyuan
Photopolymerization, which is one of the most attractive polymerization methods, has been recently studied for the development of new photoinitiators. Herein, we use a binary mixture of titanium dioxide (TiO 2 ) nanoparticles and carboxylic diacid as a novel photoinitiator to initiate the free radical polymerization of vinyl acetate (VAc). The polymerization of VAc is achieved both in aqueous medium and bulk. The initiation mechanism of TiO 2 /diacids is studied via nuclear magnetic resonance (NMR) spectroscopy using 13 C labeled diacids as probing molecules. Further, a universal reaction mechanism is established, where the polymerization of VAc is initiated by the HOOC-R˙ radical, which is generated from the photocatalytic decarboxylation of the diacid. The polymerization kinetics results indicate that the polymerization rate is strongly dependant on the diacid structure. Compared to the use of diacids with an odd number of carbons, it is found that using diacids with an even number of carbons results in the polymerization rate reaching the maximum value faster.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2018
·
IF 7.9
Yuan Zhang,Yong Wang,Hongyou Cui,Pingping Zhao,Feng Song,Xiuyu Sun,Yujiao Xie,Weiming Yi,Lihong Wang
Conversion of the carboxylic acids in bio-oil into ketones via decarboxylation is a highly efficient approach for bio-oil upgrading. However, the char formation during decarboxylation is due to the existence of a considerable amount of pyrolytic sugars in bio-oil, which severely weakens the upgraded bio-oil yield and the energy efficiency. In this paper, two pretreatment approaches, hydrolysis and oxidative hydrolysis, were employed to solve this problem. The pyrolytic sugars in bio-oil were firstly enriched into the water-soluble fraction through water extraction, followed by hydrolysis or oxidative hydrolysis pretreatment before decarboxylation. With the aid of hydrolysis pretreatment, the upgraded bio-oil yield was increased from 27.55 to 30.74%, and the energy efficiency was increased from 77.59 to 88.67% after decarboxylation, whereas the char yield was decreased from 5.67 to 3.81% in comparison with the results without hydrolysis. In the case of oxidative hydrolysis pretreatment, the upgraded bio-oil yield and the energy efficiency were further enhanced to be 32.68% and 92.70% respectively, while the char yield was drastically decreased to only 1.15%. To clarify the effect of the pretreatment, two pentoses and four hexoses were used to investigate the reaction pathways for their conversion in the water-soluble fraction during hydrolysis or oxidative hydrolysis pretreatment. The experimental results showed that hydrolysis of the water-soluble fraction could effectively convert pyrolytic sugars to carboxylic acids. In contrast, oxidative hydrolysis could convert not only the pyrolytic sugars, but also most of the aldehydes and ketones in the water-soluble fraction into carboxylic acids. The reaction pathways for conversion of pentose and hexose into organic acids via oxidative hydrolysis were also investigated.
研究领域:
生物质能
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化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2020
·
IF 4.335
Zhiwei Chen,Xiang Bai,Jie Sun,Yicheng Xu
A facile Fe(III)-catalyzed oxidative decarboxylative radical coupling reaction of α,α-difluoroarylacetic acids with coumarins has been developed. This transformation, which provides a series of C-3 difluoroarylmethylated coumarins containing various functional groups in moderate-to-good yields, features easily accessible starting materials and operational simplicity.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 66
·53342-53348
·
IF 3.84
Xiaoqing Dong,Peng Hu,Guigang Zhu,Zhiquan Li,Ren Liu,Xiaoya Liu
A series of photobase generators (PBGs), which contain thioxanthone as the chromophore and different quaternary ammonium salts as latent active species, were straightforwardly synthesized in two steps and their structures were characterized. Investigation on the photophysical properties of the PBGs indicated that the PBGs were photosensitive to long wavelengths due to the characteristic absorption of thioxanthone at 380 nm. A study on photolysis confirmed the photoinduced decarboxylation mechanism, through which the PBGs released active basic species efficiently. All the novel PBGs showed high activity in catalysing thiol–epoxy polymerization without postexposure baking. This is especially true for the PBG containing 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), which exhibited a faster polymerization rate and higher epoxy conversion than the previously described highly active PBG system.
研究领域:
材料化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yuqi Zhou,Hanqing Lv,Jin Lin,Tianyu Lv,Nan Wang,Heqing Tang,Lihua Zhu
This work reports a mechanochemical (MC) method for complete defluorination of perfluorooctanoic acid (PFOA) by using Al and Al 2 O 3 as milling agents. Both the Al/Al 2 O 3 molar ratio ( n Al / n Al 2 O 3 ) and the pre-thermal treatment of Al 2 O 3 strongly influenced the defluorination of PFOA. When commercial γ -Al 2 O 3 was pre-treated at 1200 °C, the use of Al and heat-treated γ -Al 2 O 3 with n Al / n Al 2 O 3 of 1: 1 led to PFOA defluorination of 100% after ball milling for 26 min at 350 rpm, being much higher than those (8.3%–58.1%) for using singlet milling agents or binary milling agents containing γ -Al 2 O 3 pre-heated at temperatures lower than 700 °C. It was clarified that the carboxylate-mediated adsorption of PFOA on Al 2 O 3 was essential for the MC decarboxylation as a degradation initiation step, and the in-situ generated electron on milled Al consequently caused the reductive dissociation of C–F bonds in the decarboxylation intermediate. A larger n Al / n Al 2 O 3 increased the in-situ electron generation rate ( r e ), and a higher heat-treatment temperature decreased OH − /H 2 O adsorbed on Al 2 O 3 to low the PFOA decarboxylation rate ( r dec ). The r e / r dec ratio determined defluorination pathways, and the percentage of the defluorination of PFOA in its total degradation including the generation of any degradation intermediates increased linearly with increasing r e / r dec .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Haibiao Yu,Xiu Jia,Peng Wang,Ying Xiong,Weijun Shan,Congge Zhang,Zhimeng Song
A series of x wt%Al-SBA-15 catalysts prepared by modified wetness impregnation was investigated for γ-valerolactone (GVL) decarboxylation to butene . It was found that the impregnation of Al species not only remained the ordered mesoporous structure of parent SBA-15, but also created large amounts of Brønsted and Lewis acid sites on the surface of catalyst. The considerable amount of solid acid sites and the suitable Brønsted/Lewis acid ratio endowed 2.23 wt%Al-SBA-15 catalyst an excellent catalytic performance. Under the optimized conditions, the GVL conversion and butene yield can reach 99.8% and 96.6% at 320 °C, respectively. Mechanism studies indicated that the decarboxylation of γ-protonated PEA controlled speed of the whole reaction. Moreover, the catalytic activity of regenerated 2.23 wt%Al-SBA-15 catalyst was satisfactory after eight cycle tests, and the butene yield could still reach 92.2%.
研究领域:
催化化学
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生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2017
·Vol. 25
·期 7
·722-729
·
IF 1.405
Cao Min,Zhang Chuanhui,He Bo,Huang Mujun,Jiang Sujun
As a bio-based material, 2,5-furandicarboxylic acid (FDCA) has been used widely as alternative material to terephthalic acid to produce polyesters or polyamides. In this study, PA10T/10F with melting point higher than 280 °C was produced under existing industrialization process (prepolymerization+solid state polymerization (SSP)), viscosity of which was affected greately by decarboxylation of FDCA. TGIR technique was used to study decarboxylation, and 1,10-decanediamine, CO 2 , H 2 O and furan derivates can be found, verifying decarboxylation scheme. 1 H NMR, 13 C NMR and 2D NMR analysis showed that nearly half of the feeding FDCA monomers decarboxylates during SSP, instead of entering the polyamide chain, leading to the lower furan moiety ratio in polymers compared to that of feeding ratio. However, thermal stability of PA10T/10F polyamide is comparable to PA10T homopolymer, which indicates that FDCA can be a promising base material for heat-resistant polyamide production.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）