INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Yingying Li,Xueli Ma,Wei Lv,Hong Chen,Linhao Yu,Zewei Ma,Sen Wang,Yongdan Li
Cr-doped ZnAl mixed oxide catalysts (Zn0.75CrAl-x-c) were obtained via calcining the Zn0.75CrAl-x hydrotalcite precursors and were applied in the selective oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (FDCA). Cr doping significantly enhanced the catalytic activity. A 95.1% 5-HMF conversion with an 88.1% FDCA selectivity was achieved over the Zn0.75CrAl-6-c catalyst at 130 °C under 0.6 MPa oxygen for 4 h. The good performance was associated with the high specific surface area and high oxygen vacancy concentration. Moreover, the Zn0.75CrAl-6-c catalyst was used for five cycles without a significant activity loss indicating excellent stability.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Ruihong Dong,Mengting Zhu,You Long,Qiang Yu,Chang Li,Jianhua Xie,Yousheng Huang,Yi Chen
This study evaluated chemical compositions of green coffee beans from multi-production regions and correlated this information with thermal contaminants in roasted coffee. Using multivariate statistical techniques, formation of 5-hydroxymethylfurfural (5-HMF), furan, 2- and 3-methylfuran were positively correlated with lipid, sucrose, glutamic acid, phenylalanine, margaric acid, linolenic acid and trigonelline in green coffee beans. Moreover, significant positive correlations between acrylamide (AA) levels with aspartic acid, serine, alanine, histidine, asparagine, protein, and caffeine was found in green beans. Despite this, 5-HMF, furan, 2- and 3-methylfuran showed negative correlations with active constitutes (neochlorogenic acid, cryptochlorogenic acid, caffeine, total phenolics (TPC) and total flavonoids contents (TFC)), and several amino acids, and there were slight negative relationships between AA and myristic acid, palmitic acid, chlorogenic acid, sucrose, lipid, TPC and TFC. This study provides valuable enlightenment for the selection of proper coffee beans for production of coffee with high nutrition and low chemical hazardous risks.
研究领域:
食品科学
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分析化学
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营养学
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产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 13
·期 5
·4305-4315
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IF 4.05
Yan Lishi,Li Liangzhi,Zhou Yuanzhuo,Hu Cuiying,Lu Chenxi,Shen Xin
Kinetic model is an important approach for quantitative expression of the mechanism of polysaccharide degradation to value-added products. This study conducted a mechanistic kinetic comparison for acidic degradation of terrestrial biomass-derived cellulose and marine algae-derived agarose to monosaccharides and 5-hydroxymethylfurfural (5-HMF). A pseudo-homogeneous first-order reaction kinetic model with Arrhenius-type temperature dependence was applied to interpret acidic degradation process of cellulose and agarose. The subsequent sensitivity analysis of the impact of rate constants on the production of monosaccharides and 5-HMF predicted in the kinetic model was performed. Results showed that rate constant of polysaccharide hydrolysis (k 1 ) exceeded rate constants of monosaccharide dehydration (k 2 ) and 5-HMF degradation (k 3 ) during agarose decomposition process, but was opposite in cellulose depolymerization process. The corresponding activation energy of agarose hydrolysis (64.5 kJ mol −1 ) was much lower than that of cellulose hydrolysis (121.4 kJ mol −1 ). Agarose was demonstrated to be superior to cellulose for producing monosaccharides and 5-HMF. The desired yields of monosaccharides and 5-HMF from agarose were obtained 58.5% and 27.5%, respectively. Subsequent sensitivity analysis revealed that rate constants k 1 and k 3 were the key factors controlling production of monosaccharides and 5-HMF from agarose, respectively.
研究领域:
化学工程
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生物化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2017
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IF 4.339
Yong-Jian Xu,Jing Shi,Wei-Peng Wu,Rui Zhu,Xing-Long Li,Jin Deng,Yao Fu
In this paper, Cp*Ir (III) Complex and acid co-catalyst system was developed. By using Cp*Ir and γ-Al 2 O 3 (Lewis acid), 5-hydroxymethylfurfural (5-HMF) can be converted efficiently to 3-hydroxymethyl cyclopentanone (HCPN). Meanwhile, Cp*Ir and Brønsted acid can promote conversion of 5-HMF to 1-Hydroxy-2,5-hexanedione (HHD). The effect of Lewis acid and Brønsted acid on the hydrogenation of furan derivatives was studied. Mechanism of conversion of 5-HMF to HCPN was discussed in detail and mechanism proposed by our predecessors was revised. Instead of being an intermediate for the formation of HCPN, it is believed that, HHD is a product of another reaction pathway. HHD condensed via Aldol reaction to produce 3-methylcyclopenten-2-ol-1-one (MCP) instead of HCPN. Under the promotion of Lewis acid, 5-HMF firstly convert to the precursor of HHD. After that, the reaction is through 4 π-electrocyclic ring closure process and HCPN was formed ultimately. Furthermore, we found that our Cp*Ir and acid co-catalyst system is suitable for a variety of furfural compounds. By using Cp*Ir, Brønsted acid can promote conversion of furfural compounds to straight chain ketones and Lewis acid can promote the rearrangement of furfural compounds to cyclopentanone derivatives.
研究领域:
催化
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有机化学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）