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RISS 인기검색어
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- 저자 : Chikate, Rajeev C. (검색결과 2 건)
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Bifunctional role of Pd/MMT-K 10 catalyst in direct transformation of furfural to 1,2-pentanediol
Date, Nandan S.,Chikate, Rajeev C.,Roh, Hyun-Seog,Rode, Chandrashekhar V. Elsevier 2018 CATALYSIS TODAY - Vol.309 No.-
<P><B>Abstract</B></P> <P>The acid functionality of montmorillonite clay K 10 (MMT-K 10) was found to play a key role to give 1,2-pentanediol (1,2-PeDO) in Pd catalysed furfural hydrogenation. Among various Pd loadings on MMT-K 10, 3% Pd/MMT-K 10 catalyst exhibited excellent performance giving almost complete conversion of FFR and the highest selectivity of 66% to 1,2-PeDO. Py-IR of the catalyst evidenced the presence of Brønsted acidity which was responsible in C5-O cleavage of furan ring after the formation of furfuryl alcohol which is the first step intermediate in FFR hydrogenation. At a lower temperature of 140°C, highest selectivity of 56% was achieved for FAL while increase in temperature to 220°C, enhanced the selectivity to 1,2-PeDO. Keeping the temperature constant at 220°C, increase in H<SUB>2</SUB> pressure from 500 to 750psig, resulted in decrease in 1,2-PeDO selectivity from 66 to 34% with proportionate increase in THFAL selectivity. Thus as per the requirement, the product selectivities can be tailored by varying the reaction parameters suitably. Several control experiments were also performed the results of which combined with the characterization data allowed to propose a plausible reaction pathway for the formation of 1,2-PeDO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3% Pd/MMT-K10 gave complete FFR conversion with 66% 1,2-PeDO. </LI> <LI> Brønsted acidity of the catalyst is responsible for C5-O cleavage of furan ring. </LI> <LI> Product selectivities by varying H<SUB>2</SUB> pressure. </LI> <LI> Proposed reaction pathway to 1,2-PeDO involved FAL formation as the key step. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Brønsted acidity of Pd/MMT-K10 responsible to give 1,2-PeDO in single step furfural hydrogenation.</P> <P>[DISPLAY OMISSION]</P>
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Yun-Jo Lee,Jo-Yong Park,Hari S. Potdar,Rajeev C. Chikate,전기원 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.1
A simple chemical route is developed to generate maghemite (g-Fe2O3) nano-particles, dispersed in organic solvents via a thermaldecomposition of an ironhydroxy oleate precursor. An ironhydroxy oleate precursor was generated by chemical reaction of mixed iron nitrateand oleic acid in ethanol with 30% NH3 solution with continuous stirring at room temperature. The precursor thus obtained was suspended in8C/2 h toconvert it in tog-Fe2O3 nano-particles. The mixture is allowed to cool slowly to room temperature. Theg-Fe2O3 nano-particles remained indispersed state in hexadecane. The ironhydroxy oleate molecular precursor andg-Fe2O3 nano-particles are characterized using various physico-chemical characterization techniques like DTA/TGA, IR, XRD, vibrating sample magnetometer (VSM), TEM, and EDAX. The characterizationresults indicated thatg-Fe2O3 nano-particles (size 615 nm) are obtained by a thermal decomposition of an ironhydroxy oleate precursor andpossess sphericalshape. These particles remained dispersedstate inorganicsolventdueto cappingaction ofoleate molecules. The results are quitereproducible andg-Fe2O3 nano-particles can also be dispersed in another organic solvents like kerosene, 2-methyl naphthalene etc.#
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