مقاله Catalytic hydrogenation of xylose to xylitol using ruthenium catalyst on NiO modified TiO2 support : تی پی بین

خلاصه مقاله

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) massspectrometry, 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◦C) were studied. Although at higher temp 140 ◦C, the conversion of xylose was increased to optimum level, xylose to xylitol selectivity decreased due to formation of by-products.

نویسندگان

Mithilesh Yadav [ Biorefinery Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea ]

Dinesh Kumar Mishra [ Biorefinery Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea ]

Jin-Soo Hwang [ Biorefinery Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of Korea ]

کلمات کلیدی

Hydrogenation Xylose Xylitol Ruthenium NiO modified TiO2 support

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مشاهده مقالات

2012 Applied Catalysis A: General

The scope of Applied Catalysis A: General includes the following:Scientific understanding of any catalytic phenomenon .Phenomena of relevance to current industrial processes, processes under industrial development or of interest for future commercial applications are particularly welcome. Heterogeneous, homogeneous and biocatalysts are included .Research investigating catalytic actions of heterogeneous, homogeneous, biological and natural systems are especially encouraged. Scientific aspects of preparation, activation, aging, deactivation, rejuvenation, regeneration and start up transient effects of commercially interesting or representative model catalysts. Scientific methods of characterization of catalysts, especially if they are applicable to industrial catalysts .Chemical engineering aspects relevant to an improved understanding of catalytic phenomena or application to catalysis. Results involving a joint approach by chemical engineering and catalytic science are particularly welcome. New catalysts, catalytic reactions, catalytic routes and processes of potential practical interest. Catalysis and catalytic processes for sustainable practices, including sustainable energy supply and consumption processes, and sustainable chemicals production.

حوزه های تحت پوشش : Petrochemical industry , Catalytic Science , chemical scientists in both industrial and academic fields