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RISS 인기검색어
- 검색키워드
- 저자 : Bhari Mallanna Nagaraja (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Nagaraja, Bhari Mallanna,Abimanyu, Haznan,Jung, Kwang-Deog,Yoo, Kye-Sang Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Spray pyrolysis has been found as an excellent method for the preparation of mesoporous barium sulfate at higher temperature. Ethylene glycol, a reducing agent, and solvents had good inhibition effect for the preparation of $BaSO_4$ nano particles. The $BaSO_4$ solution was sprayed at 500 & 800 ${^{\circ}C}$ using different solvents such as methanol, ethanol, propanol and n-butyl alcohol. $N_2$ adsorption-desorption isotherm revealed that $BaSO_4$ is micropore free, possessing narrow mesopores size distribution and high BET surface areas of 72.52 $m^2\;g^{-1}$ at 800 ${^{\circ}C}$ using propanol as an additive. Scanning electron microscopy (SEM) indicates that the morphology of $BaSO_4$ nano material shows uniform shell like particles. Transmission electron microscopy (TEM) proved that the resulting BaSO4 nano particles were uniform in size and the average particle size was 4-8 nm. The surface functionality and ethylene glycol peaks were assessed by Fourier transform infrared resonance (FTIR) spectroscopy. Low intensity ethylene glycol specific absorption peak was observed in propanol which proved that propanol had good inhibition effect on the structural morphology of nano particles.
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Bhari Mallanna Nagaraja,유계상,정광덕,Haznan Abimanyu 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Spray pyrolysis has been found as an excellent method for the preparation of mesoporous barium sulfate at higher temperature. Ethylene glycol, a reducing agent, and solvents had good inhibition effect for the preparation of BaSO₄nano particles. The BaSO₄solution was sprayed at 500 & 800℃ using different solvents such as methanol, ethanol, propanol and n-butyl alcohol. N₂adsorption-desorption isotherm revealed that BaSO₄is micropore free, possessing narrow mesopores size distribution and high BET surface areas of 72.52 m² g-¹ at 800℃ using propanol as an additive. Scanning electron microscopy (SEM) indicates that the morphology of BaSO₄nano material shows uniform shell like particles. Transmission electron microscopy (TEM) proved that the resulting BaSO₄nano particles were uniform in size and the average particle size was 4-8 nm. The surface functionality and ethylene glycol peaks were assessed by Fourier transform infrared resonance (FTIR) spectroscopy. Low intensity ethylene glycol specific absorption peak was observed in propanol which proved that propanol had good inhibition effect on the structural morphology of nano particles.
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Jadhav, Arvind H.,Prasad, Divya,Jadhav, Harsharaj S.,Nagaraja, Bhari Mallanna,Seo, Jeong Gil Elsevier 2018 ENERGY Vol.160 No.-
<P><B>Abstract</B></P> <P>Solid basic catalysts are extremely useful for green catalytic processes because of their high activity, easy separation, and minimal corrosion. Herein, we report the development and effect of the basicity of five various MgO nanostructures developed by microwave (MW) irradiation in different ionic liquids (ILs) on the Claisen-Schmidt Condensation Reaction. The growth of the shape-controlled MgO nanostructures in the presence of the synergetic effect of the ILs with the MW irradiation developed various basic sites on the surface of the MgO nanocrystals. Due to the synergetic effect (formation of hydrogen bonding and π-π interactions between the ILs and the MgO precursor in the presence of MW irradiation) produced active basic sites in the final nanostructure. The TPD & XPS results show that the synergetic effect strongly altered the percentages of high, low, and moderate basic sites of the catalysts. To determine their catalytic activity based on the obtained different basicity in the MgO nanostructures, prepared all nano structures were tested in the reaction. The altered basicity of the MgO catalysts strongly affected on reaction results and demonstrated better activity than pure MgO. Particularly, hexagonal MgO nanostructures with exposed crystal facets (110) and (111) having high surface area and basicity showed an outstanding activity. In addition, effect or reaction parameters such as temperature, catalyst amount, solvent effect, and reaction time were determine and obtained optimized reaction condition for outstanding results. To determine the diversity of prepared MgO nanostructures, various substituted chalcones were prepared in optimized reaction condition in good to efficient yield. Recyclability of prepared catalyst was also determined up-to 6 cycles and physicochemical changes before and after recyclability test was determined. The proper correlation of obtained basicity & basic sites with the catalytic activity was established with this protocol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Shape controlled MgO structures were used as catalysts having altered basicity. </LI> <LI> Altered basicity developed by ILs and MW irradiation while structure development. </LI> <LI> Exposed high surface with (110) (111) facets of MgO showed outstanding activity. </LI> <LI> Catalysts can be recycled without disturbing morphology and catalytic activity. </LI> <LI> New green approach for the alteration of basic sites in heterogeneous base catalysts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Komal N. Patil,Divya Prasad,Vilas K. Manoorkar,Jayesh T. Bhanushali,Arvind H. Jadhav,Bhari Mallanna Nagaraja 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Production of c-butyrolactone (GBL) from vapour-phase dehydrocyclization of biomass derived 1,4-butanediol is considered as more sustainable and significantly commercial industrial process. In thisregards, Cu-based catalyst was designed with ZnAl2O4 spinel support and CeO2 as a promoter to obtainCu/ZnAl2O4-CeO2 catalyst with different Cu:Ce mass ratio. The catalysts were characterized by XRD,H2-TPR, FT-IR, CO2-TPD, FE-SEM and BET analysis and then tested for the production of cbutyrolactone(GBL) by dehydrocyclization of 1,4-butanediol (BDO). Further, various reaction parameterswere optimized and their effects on the catalytic activity were studied to obtain maximum yield towardsdesired product at ambient reaction conditions. The results revealed that metallic Cu species and CeO2 asa promoter were highly dispersed on ZnAl2O4 support with appreciable surface area. Additionally, CeO2as a promoter prevented agglomeration, increased the basic character of catalyst to selectively obtain GBLas a major product. 10 wt% Cu/ZnAl2O4-10 wt% CeO2 catalyst exhibited excellent yield (94%) towards GBLproduct with tetrahydrofuran (THF) as the only by-product and demonstrated consistent activity andselectivity during 26 h time on stream. Further, the optimized catalyst displayed appreciable recyclabilityperformance up to seven recycles without much loss in its catalytic performance making the catalyst feasibleat industrial scale.
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