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RISS 인기검색어
- 검색키워드
- 저자 : Haryo Pandu Winoto (검색결과 4 건)
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Ionic Liquids Containing 1,1-Dicyano-1-acetylmethanide Anion as Potential Electrolytes
Winoto, Haryo Pandu,Agarwal, Shalu,Im, Jin-Kyu,Cheong, Min-Serk,Lee, Je-Seung Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
Various types of room temperature ionic liquids (RTILs) containing 1,1-dicyano-1-acetylmethanide anion ($[C(CN)_2(COCH_3)]^-$, $[DCNAcC]^-$) were prepared and their physical and electrochemical properties were studied. All of these ILs exhibited high thermal stabilities over $200^{\circ}C$ and relatively high ionic conductivities up to 29.4 $mS\;cm^{-1}$ at $80^{\circ}C$. Although the ionic conductivity of IL containing bis(trifluoromethanesulfonyl)-imide ($[Tf_2N]^-$) anion is higher than that of ILs bearing $[DCNAcC]^-$ anion, the specific capacitance of ILs bearing $[DCNAcC]^-$ anion are higher than that of IL containing $[Tf_2N]^-$ anion and showed high temperature dependence. Such favorable electrochemical properties of these ILs are likely to be attributed to the efficient dissociation of cation and anion at higher temperature and enhanced electrosorption of $[DCNAcC]^-$ anion at the electrode.
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Ionic Liquids Containing 1,1-Dicyano-1-acetylmethanide Anion as Potential Electrolytes
Haryo Pandu Winoto,Shalu Agarwal,임진규,정민석,이제승 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
Various types of room temperature ionic liquids (RTILs) containing 1,1-dicyano-1-acetylmethanide anion ([C(CN)2(COCH3)]−, [DCNAcC]−) were prepared and their physical and electrochemical properties were studied. All of these ILs exhibited high thermal stabilities over 200 oC and relatively high ionic conductivities up to 29.4 mS cm−1 at 80 oC. Although the ionic conductivity of IL containing bis(trifluoromethanesulfonyl)- imide ([Tf2N]−) anion is higher than that of ILs bearing [DCNAcC]− anion, the specific capacitance of ILs bearing [DCNAcC]− anion are higher than that of IL containing [Tf2N]− anion and showed high temperature dependence. Such favorable electrochemical properties of these ILs are likely to be attributed to the efficient dissociation of cation and anion at higher temperature and enhanced electrosorption of [DCNAcC]− anion at the electrode.
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Haryo Pandu Winoto,안병성,재중호 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
A bifunctional Sn-Al-Beta zeolite which possesses isolated Lewis and Brønsted acid sites was prepared bya post-synthesis procedure and applied to the one-pot conversion of furfural to g-valerolactone (GVL), avalue-added chemical. Sn-Al-Beta was capable of catalyzing a cascade of the transfer hydrogenation andhydrolysis of furfural to GVL by the interplay of Lewis and Brønsted acid sites. The degree ofdealumination and the tin-incorporation method largely influence the acid properties of the catalyst andthe catalyst selectivity. A high yield of GVL up to 60% was obtained with Sn-Al-Beta 7 (Si/Sn = 63 and Si/Al = 473) at 180 8C in 2-butanol.
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Winoto, Haryo Pandu,Fikri, Zuhroni Ali,Ha, Jeong-Myeong,Park, Young-Kwon,Lee, Hyunjoo,Suh, Dong Jin,Jae, Jungho Elsevier 2019 Applied Catalysis B Vol.241 No.-
<P><B>Abstract</B></P> <P>A novel bifunctional catalyst that enables an efficient one-pot conversion of furfural into γ-valerolactone (GVL) has been developed by anchoring heteropolyacid (HPA) on Zr-Beta zeolite. The catalysts were prepared by a post-synthesis procedure, which consists of the dealumination of Al-Beta, incorporation of Zr into the beta framework through solid-state ion-exchange and impregnation of the HPA. Zr-Beta is used as a Lewis acid catalyst to catalyze the transfer hydrogenation of furfural and levulinic acid/ester using 2-propanol as a hydrogen donor. To deal with the inability of Zr-Beta to catalyze the hydrolytic ring-opening of furans toward GVL, phosphotungstic acid (HPW) and silicotungstic acid (HSiW) were introduced to the Zr-Beta as BrØnsted acid sites. The characterization of the catalysts using XRD, UV–vis and XPS as well as TPD of ammonia and FT-IR spectroscopy of the adsorbed pyridine revealed that the HPA/Zr-Beta possesses both isolated Lewis and BrØnsted acid sites. When they were applied to the one-pot cascade conversion of furfural, the initial activity of the HPA/Zr-Beta toward GVL production were 2–3 times greater than that for Zr-Beta due to the enhanced hydrolytic ring-opening of the furans promoted by the added BrØnsted acidity. Especially, HPW loaded Zr-Beta demonstrated a remarkable GVL yield of ∼70% at 433 K after 24 h due to its high thermal stability and stronger BrØnsted acidity, and its activity far surpasses that of the conventional Sn-Al-Beta zeolite (∼40%). Overall, this study demonstrates that an incorporation of HPA into Lewis acid Sn- or Zr-Beta zeolites is an effective strategy to create isolated Lewis and BrØnsted acid sites within a single catalyst, thereby allowing the selective cascade catalysis for the cost-effective production of high-value chemicals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Heteropolytungstae (HPW)-loaded Zr-Beta is synthesized via a simple post-synthesis method. </LI> <LI> The method consists of dealumination of Al-Beta followed by sequential incorporation of Zr and HPW. </LI> <LI> HPW/Zr-Beta zeolite possesses both isolated Lewis and Brønsted acid sites. </LI> <LI> Transfer hydrogenation and ring-opening reactions is effectively combined using a single catalyst. </LI> <LI> One-pot cascade conversion of furfural to GVL with a high yield (∼70%) is achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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