The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Sibudjing Kawi - One of the best experts on this subject based on the ideXlab platform.
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ni and or ni cu alloys supported over sio2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.
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Ni and/or Ni–Cu alloys supported over SiO2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.
Yizhak Marcus - One of the best experts on this subject based on the ideXlab platform.
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On the surface tension of room temperature ionic liquids
Fluid Phase Equilibria, 2017Co-Authors: Yizhak MarcusAbstract:Abstract Following previous workers, the surface tension of room temperature ionic liquids (RTILs) is shown to depend reciprocally on the surface area of the void space in the RTILs. The void space in liquids in general and in RTILs in particular can be expressed in several manners. The fraction of free space in RTILs can be estimated well and most simply from their Actual Molar volumes and the ionic volumes of the constituting ions. The temperature dependence of the surface tension is explored and shown to be essentially independent on the natures of the RTILs.
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Ionic and Molar volumes of room temperature ionic liquids
Journal of Molecular Liquids, 2015Co-Authors: Yizhak MarcusAbstract:Abstract A large set of ionic volumes of the constituent ions of a variety of (non-protic) RTILs is used for the estimation of their Molar volumes, hence their densities, at various temperatures by means of two fitting parameters only. The difference between the sum of the ionic volumes of the cation and the anion per mole and the Actual Molar volume is ascribed to the expansion of the RTIL on melting.
Jangam Ashok - One of the best experts on this subject based on the ideXlab platform.
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ni and or ni cu alloys supported over sio2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.
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Ni and/or Ni–Cu alloys supported over SiO2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.
Jianyong Yu - One of the best experts on this subject based on the ideXlab platform.
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Poly(ethylene terephthalate) copolyesters and fibers modified with NPG and SIPE for improved hydrophilicity and dyeability
Journal of The Textile Institute, 2017Co-Authors: Rong Zhou, Xueli Wang, Liqian Huang, Faxue Li, Jianyong YuAbstract:A series of Poly(ethylene terephthalate) (PET)-based copolyesters containing sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate (SIPE) and 22-dimethyl-13-propanediol (NPG) were successfully synthesized. The results showed that the Actual Molar ratio of comonomers was consistent with the relative feed ratio, and the thermal properties of copolyester were greatly dependent on the amount of NPG. Meanwhile, the modified PET fibers were prepared via traditional melting-spinning and the effects of NPG amounts and draw ratio on the crystallinity, orientation, and mechanical property of the fibers were also investigated. Furthermore, the hydrophilic property and dyeability of the fibers were explored. The results showed that compared with the pure PET fibers, the resultant fibers exhibited improved hydrophilicity and dyeability, which also were controllable by tuning the amount of NPG and in turn provided the modified PET fibers with more potential application in various fields.
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Preparation and characterization of poly(ethylene terephthalate) copolyesters and fibers modified with sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate and poly(ethylene glycol)
Journal of The Textile Institute, 2015Co-Authors: Mingliang Zhao, Xueli Wang, Jianyong YuAbstract:New copolyesters were successfully prepared with SIPE and PEG units designated as cationic dyeable polyester and easy cationic dyeable polyester. The number average molecular weight of PEG unit is 6000 (abbreviated as PEG6000). Corresponding copolyesters were spun into fibers with melt spinning method. Chemical and crystalline structures were characterized by the NMR and WAXD measurement, and thermal properties were tested by Differential Scanning Calorimetry and Thermogravimetric Analysis, respectively. NMR experimental results indicated the Actual Molar ratio of comonomers was basically consistent with the correlative feed ratio. WAXD results showed that crystalline structures of prepared copolyesters were similar to that of Poly(ethylene terephthalate). Moreover, the glass transition temperature, melting temperature, and thermal degradation temperature were found to decrease with the increase in weight ratio of PEG6000 units since the incorporation of higher PEG6000 content brought more ether bonds int...
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Preparation and characterization of poly(ethylene terephthalate) copolyesters modified with sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate and poly(ethylene glycol)
Journal of Applied Polymer Science, 2013Co-Authors: Mingliang Zhao, Jianyong Yu, Faxue Li, Xueli WangAbstract:Two types of poly(ethylene terephthalate) (PET) copolyesters were successfully prepared with sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate (SIPE) and poly(ethylene glycol) (PEG) units with different molecular weights named as cationic dyeable polyester and easy cationic dyeable polyester. Their chemical and crystalline structures were characterized by the nuclear magnetic resonance (NMR), wide angle X-ray diffraction (WAXD), and small angle X-ray scattering measurement, and their thermal properties were tested by differential scanning calorimetry and thermogravimetric analysis, respectively. NMR experimental results showed that the Actual Molar ratio of comonomers was basically consistent with the correlative feed ratio. WAXD results indicated that the crystalline structures of prepared copolyesters were similar to that of PET. Moreover, the glass transition temperature, melting temperature, and thermal degradation temperature were found to decrease with the reduction of the of PEG units as the incorporation of lower of PEG units brought more ether bonds into molecular chains, which increased the irregularity of molecular chain arrangement and led to lower crystallinity. In addition, because the incorporation of PEG units with lower molecular weight led to more ether bonds and hydroxyl end-groups in molecular chains, the value of contact angle of PET copolyesters dropped, manifesting PET copolyesters had better hydrophilicity with the decreasing molecular weight of PEG units.© 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39823.
Yasotha Kathiraser - One of the best experts on this subject based on the ideXlab platform.
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ni and or ni cu alloys supported over sio2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.
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Ni and/or Ni–Cu alloys supported over SiO2 catalysts synthesized via phyllosilicate structures for steam reforming of biomass tar reaction
Catalysis Science & Technology, 2015Co-Authors: Jangam Ashok, Yasotha Kathiraser, Sibudjing KawiAbstract:In this paper, we describe the synthesis of Ni/SiO2 and Ni–Cu/SiO2 catalysts derived from phyllosilicate structures (Ni/SiO2P and Ni–Cu/SiO2P, respectively) for steam reforming of biomass tar reaction. The steam reforming of biomass tar reaction was investigated with cellulose as a biomass model compound. The influence of steam-to-carbon ratio and reaction temperatures was also explored. Overall, the catalysts synthesized via phyllosilicate structures gave better catalytic performance than the catalysts prepared by the impregnation method. An optimum catalyst composition of 30Ni–5Cu/SiO2P gave superior catalytic performance in terms of stability and activity compared to all other catalysts. At 600 °C, about 78% of biomass was converted to gaseous products over 30Ni–5Cu/SiO2P, which is the highest among all the catalysts tested. Temperature-programmed reduction results indicate that the metal–support interaction of Ni/SiO2P catalyst prepared via phyllosilicate structures is stronger due to the unique layered structure compared to that prepared by conventional impregnation (10Ni/SiO2). The formation of a unique layered structure in Ni/SiO2P and Ni–Cu/SiO2P was also confirmed through TEM analysis. The surface elemental composition results obtained from XPS analysis show that the Cu/Ni surface Molar ratio for Ni–Cu/SiO2P catalysts is consistent with the Actual Molar ratio values obtained from SEM-EDX analysis. This result suggests that the bimetallic catalysts synthesized via the phyllosilicate structure route can yield uniformly distributed alloy species.