Chemistry-Switzerland
·
2024
·Vol. 6
·期 6
·1622-1634
·
IF 2.4
Yumeng Song,Ping Chen,Hui Lou,Xiaoming Zheng,Xiangen Song
This paper studies the catalytic hydrogenation reduction of lignin-derived phenolic compounds, such as catechol, guaiacol (O-methoxyphenol), phenol, P-methylphenol, O-ethylphenol, O-ethoxyphenol, etc. The reaction system focuses on the catalytic performance of hydrodeoxygenation reactions involving the phenolic derivatives of the lignin depolymerization products catechol and guaiacol. A series of Al2O3-TiO2composite oxide supports with different Al/Ti ratios were prepared by a co-precipitation method, and a 5% Pd/Al2O3-TiO2bifunctional catalyst was prepared by an impregnation method and characterized with XRD, SEM, BET, NH3-TPD, etc. Among these, the Pd/Al2Ti1catalyst had the most excellent catalytic performance. At 100 °C and 2 MPa hydrogen pressure, the conversion of catechol was as high as 100%, and at 100 °C and 5 MPa hydrogen pressure, the conversion of guaiacol reached 90%.
研究领域:
催化化学
·
生物质转化
·
绿色能源
·
有机化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Junfeng Wen,Yang Yu,Qijun Pei,Alexis Munyentwali,Teng He,Yunhua Xu,Ping Chen
Sodium phenoxide is considered as one of the potentially promising hydrogen storage materials due to its high hydrogen capacity and enhanced thermodynamic properties. However, efficient catalysts are needed to overcome kinetic barriers of the hydrogenation and dehydrogenation processes. In the present work, an ultrafine amorphous Ru–B alloy catalyst was synthesized by a solid-phase ball milling of RuCl 3 with NaBH 4 and subsequently tested for the hydrogenation of sodium phenoxide in an aqueous solution at room temperature . The conversion of phenoxide is significantly improved by 48.9 % on the Ru 3.9 B alloy catalyst compared with pristine Ru nanoparticles . Kinetic studies revealed that the hydrogenation of sodium phenoxide is of first-order with respect to H 2 pressure and zero-order to the concentration of sodium phenoxide over the Ru 3.9 B catalyst. Characterizations showed that the electronic structure of Ru is well modulated by B, leading to an electron-rich state of Ru. The highly active catalysis may be due to the fine dispersion, amorphous state, and electron-rich state of Ru in the ultrafine alloy.
研究领域:
材料化学
·
催化化学
·
氢能源存储
·
纳米催化
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hardy Shuwanto,Hairus Abdullah,Dong-Hau Kuo,Noto Susanto Gultom
Y-doped Zn(O,S) nanocatalysts with different Y amounts have been fabricated, characterized, and applied for photocatalytic hydrogen evolution reaction (HER) and hydrogenation reaction (PHR) to reduce nitro groups and to cleave azo (N N) bond. The oxysulfide formation was confirmed by XRD, SAED, and DRS analyses. The best Y-doped Zn(O,S) could evolve hydrogen by 3,946 μmol g −1 h −1 in aqueous solution with ethanol as a hole scavenger reagent. The PHR of 5% Y-doped Zn(O,S) could hydrogenate 4-nitrophenol to 4-aminophenol and nitrobenzene to aniline in 120 and 90 min, respectively in a low-power UV light illuminated condition (16 W) as confirmed with UV–Vis spectroscopy. Besides of that, a sluggish cleavage of N N bond in azobenzene could be totally done to yield aniline within 30 min. Lastly, the detail mechanisms of HER and PHR including their molecular chemisorption phenomena were proposed and described with the steps of solvation , adsorption, pinning, and surface hydrogenation reactions.
研究领域:
材料化学
·
光催化
·
纳米催化
·
环境化学
·
能源化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 118
·97256-97263
·
IF 3.84
Qianqian Huang,Weiqiang Yu,Rui Lu,Fang Lu,Jin Gao,Hong Miao,Jie Xu
Catalytic conversion and application of bio-based platform chemicals is of great significance. Itaconic acid, one of the abundant and renewable bio-based platform chemicals, could be hydrogenated to produce methylsuccinic acid, which has important applications in pharmaceutical synthesis. Traditional catalysts can be corroded, leached and deactivated in an acid reaction environment, and the stability of the catalysts is a great challenge. Carbothermal reduction was employed to prepare stable ruthenium-based catalysts, and the results confirmed that CO generated in situ functioned as an efficient reducing species in the carbothermal reduction process. The catalysts were applied for the hydrogenation of itaconic acid, and showed good stability and resistance to acid with no obvious loss of activity and less leaching in recycling tests compared to hydrogen reduced samples which exhibited an apparent decrease of 22% for the conversion of itaconic acid. The carbothermal reduced catalysts could maintain 99% conversion and 99% selectivity for methylsuccinic acid, and maintained good stability and acid-resistance under a higher temperature and longer reaction time.
研究领域:
催化化学
·
绿色化学
·
生物质转化
·
有机合成
·
材料化学
·
工业催化
·
可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）