期刊
GREEN CHEMISTRY
卷 18, 期 9, 页码 2888-2899出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5gc01854d
关键词
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资金
- UGC-BSR New Delhi, India [603/PD6/2007]
- DST-FIST [SR/S5/NM-35/2005]
- UGC-DRS
Mesoporous aluminosilicate (Al-SBA-15) support synthesised via a direct hydrothermal method was post loaded with monometals such as 1.0 wt% RuO2 and 7.0 wt% NiO separately. Different weight percentages of bimetallic catalysts such as RuO2 (0.2-1.0 wt%) with 7.0 wt% NiO were loaded jointly on mesoporous Al-SBA-15 support by a wet impregnation method for hydrodeoxygenation of anisole. The XRD and BET results revealed that the materials were hexagonally ordered, indicating the presence of mesoporosity. NH3-TPD results confirmed the presence of acidic sites on materials, which enhanced the HDO activity of anisole. The oxidation state of Ni2+ and Ru4+ was confirmed by XPS analysis. H-2-TPR revealed the strong metal-support interaction in monometal catalysts of 7.0 wt% NiO, whereas in the case of bimetallic catalysts the reduction temperature of Ni was lowered below 440 degrees C by addition of Ru, which is lower than the that of 7.0 wt% NiO (524 degrees C). HR-TEM images further confirmed the presence of the mesoporous nature along with RuO2 and NiO crystallites largely located over the surface of Al-SBA-15. The activity of all the synthesised catalysts was tested over vapour phase hydrodeoxygenation of anisole (biomass compound). Variation in temperature and time-on-stream with atmospheric pressure was optimised to obtain high conversion and selectivity. A reaction temperature of 400 degrees C was found to be optimum. The 1.0 wt% RuO2/7.0 wt% NiO catalyst gave the highest conversion of about 46% of anisole and selectivity towards benzene of 45%. Bimetallic catalysts (1.0 wt% RuO2/7.0 wt% NiO) showed high activity compared with monometallic catalysts (1.0 wt% RuO2 and 7.0 wt% NiO) because of the synergism of Ni and Ru. Also the bimetallic catalysts showed good activity compared with other reported catalysts under variable experimental conditions.
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