Catalytic hydrogenation of xylose to xylitol using ruthenium catalyst on NiO modified TiO₂ support

详细信息    查看全文

• 作者：Mithilesh Yadav ; Dinesh Kumar Mishra ; Jin-Soo Hwang ; ^{jshwang@krict.re.kr}
• 关键词：Hydrogenation ; Xylose ; Xylitol ; Ruthenium ; NiO modified TiO2 support
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：28 May, 2012
• 年：2012
• 卷：425-426
• 期：Complete
• 页码：110-116
• 全文大小：760 K

文摘

The activity of Ru catalyst on a new class of NiO modified TiO₂ support, Ru/(NiO-TiO₂), was studied in the liquid phase catalytic hydrogenation of xylose to xylitol. The TiO₂ support was modified by simple impregnation method using nickel chloride precursor and subsequent oxidation. Various catalysts with different targeted compositions of Ru (1.0 and 5.0 wt % ) and NiO (1.0, 5.0 and 10 wt % ) in NiO-TiO₂ were prepared. These catalysts were characterized by using energy dispersive X-ray analysis (EDX/EDS), temperature-programmed reduction (TPR), inductively coupled plasma (ICP) mass spectrometry, transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and CO chemisorption. The novel catalysts are evaluated for selective hydrogenation of xylose and the results compared with those obtained from conventional Raney Ni, Ru/C and Ru/TiO₂ catalysts carried out under identical reaction conditions. The effect of NiO additive in the catalyst Ru/(NiO-TiO₂), clearly found to enhance the conversion, yield and selectivity to xylitol. Furthermore, the order of catalytic activity may be given as Ru (1.0 % )/NiO (5.0 % )-TiO₂ > Ru (1.0 % )/TiO₂ > Ru (1.0 % )/C> Raney Ni. The effects of Ru and NiO loading, xylose concentration (2.5, 15 and 30 wt % ) and temperature (100, 120 and 140¡ãC) were studied. Although at higher temp 140 ¡ãC, the conversion of xylose was increased to optimum level, xylose to xylitol selectivity decreased due to formation of by-products.