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Mishra, D.K.,Dabbawala, A.A.,Park, J.J.,Jhung, S.H.,Hwang, J.S. Elsevier Science Publishers 2014 CATALYSIS TODAY - Vol.232 No.-
HY zeolite (HYZ) supported ruthenium (Ru) nanoparticles catalyst (Ru/HYZ) is prepared by simple impregnation method and is characterized by using energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), CO chemisorption and inductively coupled plasma (ICP) mass spectrometry. The catalyst Ru/HYZ is evaluated in hydrogenation of d-glucose and hydrogenation experiments to produce a selective product d-sorbitol were conducted batch wise in a three-phase laboratory scale reactor. The kinetics studies of d-glucose hydrogenation using the catalyst Ru/HYZ were carried out. In the operating regime studied the rate of reaction showed first orders dependency with respect to d-glucose and hydrogen. For affording maximum d-glucose conversion, yield and selectivity to d-sorbitol, the reaction conditions were also optimized.
K.H. Park,김홍인,D. Mishra,C.W. Nam,J.T. Park,D.J. Kim,P.K. Parhi 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
Baking–leaching-solvent extraction process was investigated to recover metal values from waste petroleum catalyst. Baking of Mo–Ni/Al2O3 spent catalyst with H2SO4 followed by leaching of the baking mass concentrate was presented. Under optimum baking condition (temp. 300 8C, H2SO4 = 1.2stoichiometric, baking time 1 h), and low acid leaching condition (temp. 95 8C, H2SO4 = 2% (v/v), pulp density 5% and leaching duration 30 min), about 96% Mo, 99% Al and 95% Ni was dissolved. Baking–leaching results were interpreted by two different statistical analysis approaches namely Principal Component (PCA) and Multi Linear Regression Analysis (MLRA). The generated leach liquor was further subjected to the solvent extraction of Mo(VI) by LIX 84-I followed by aluminum using Na-Cyanex 272. A quantitative extraction of Mo(VI) and Al was achieved in 2-stage at A:O ratio of 1:1 with 40% LIX-84-I and 2-stages at 1:1 phase ratio with 60% neutralized Cyanex 272, respectively. While stripping the metals from loaded organic such as Mo(VI) using 20% NH4OH and Al with 3 M H2SO4, the metal concentration in the strip solution were enriched up to 1.5 times and 3 times in two and three number of stages, respectively. Based on the results of present study, a conceptual process flow diagram was proposed.
D.K. Mishra,N. Bejoy,Maheshwar. Sharon 한국탄소학회 2005 Carbon Letters Vol.6 No.2
Taguchi methodology has been applied to get an idea about the parameters related to the chemical vapour deposition technique, which influences the formation of semiconducting carbon thin film of a desired band gap. L9 orthogonal array was used for this purpose. The analysis based on Taguchi methodology suggests that amongst the parameters selected, the temperature of pyrolysis significantly controls the magnitude of band gap (46%). Sintering time has a small influence (30%) on the band gap formation and other factors have almost no influence on the band gap formation. Moreover this analysis suggests that lower temperature of pyrolysis (≤ 750℃) and lower time of sintering (≤ 1 h) should be preferred to get carbon thin film with the desired band gap of 1.2eV.
Mishra, D.K.,Bejoy, N.,Sharon, Maheshwar. Korean Carbon Society 2005 Carbon Letters Vol.6 No.2
Taguchi methodology has been applied to get an idea about the parameters related to the chemical vapour deposition technique, which influences the formation of semiconducting carbon thin film of a desired band gap. L9 orthogonal array was used for this purpose. The analysis based on Taguchi methodology suggests that amongst the parameters selected, the temperature of pyrolysis significantly controls the magnitude of band gap (46%). Sintering time has a small influence (30%) on the band gap formation and other factors have almost no influence on the band gap formation. Moreover this analysis suggests that lower temperature of pyrolysis (${\leq}$ $750^{\circ}C$) and lower time of sintering (${\leq}$ 1 h) should be preferred to get carbon thin film with the desired band gap of 1.2eV.
Park, K.H.,Kim, H.I.,Parhi, P.K.,Mishra, D.,Nam, C.W.,Park, J.T.,Kim, D.J. Korean Society of Industrial and Engineering Chemi 2012 Journal of industrial and engineering chemistry Vol.18 No.6
Baking-leaching-solvent extraction process was investigated to recover metal values from waste petroleum catalyst. Baking of Mo-Ni/Al<SUB>2</SUB>O<SUB>3</SUB> spent catalyst with H<SUB>2</SUB>SO<SUB>4</SUB> followed by leaching of the baking mass concentrate was presented. Under optimum baking condition (temp. 300<SUP>o</SUP>C, H<SUB>2</SUB>SO<SUB>4</SUB>=1.2 stoichiometric, baking time 1h), and low acid leaching condition (temp. 95<SUP>o</SUP>C, H<SUB>2</SUB>SO<SUB>4</SUB>=2% (v/v), pulp density 5% and leaching duration 30min), about 96% Mo, 99% Al and 95% Ni was dissolved. Baking-leaching results were interpreted by two different statistical analysis approaches namely Principal Component (PCA) and Multi Linear Regression Analysis (MLRA). The generated leach liquor was further subjected to the solvent extraction of Mo(VI) by LIX 84-I followed by aluminum using Na-Cyanex 272. A quantitative extraction of Mo(VI) and Al was achieved in 2-stage at A:O ratio of 1:1 with 40% LIX-84-I and 2-stages at 1:1 phase ratio with 60% neutralized Cyanex 272, respectively. While stripping the metals from loaded organic such as Mo(VI) using 20% NH<SUB>4</SUB>OH and Al with 3M H<SUB>2</SUB>SO<SUB>4</SUB>, the metal concentration in the strip solution were enriched up to 1.5 times and 3 times in two and three number of stages, respectively. Based on the results of present study, a conceptual process flow diagram was proposed.
ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn_(1-x)Cu_xO (0.03 ≤ x ≤ 0.07)
JYOSHNARANI MOHAPATRA,D. K. MISHRA,P. K. MISHRA,B. P. BAG,S. K. SINGH 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4
We report room temperature ferromagnetism (RTFM) in nanocrystalline Zn1-xCuxO (0.03 ≤ x ≤ 0.07) materials synthesized by autocombustion technique. The average particle sizes are in the range of 60 nm. The saturation magnetization and coercivity of 7% Cu-doped ZnO is enhanced significantly in comparison to 3% and 5% Cu-doped ZnO. There is not much variation in the optical band gap due to Cu doping, thus suggesting the uniform distribution of Cu in the ZnO matrix. Micro-Raman and photoluminescence analysis predict the presence of clusters of oxygen vacancies in Cu-doped system which improves with the increase in Cu concentration. This study provides further evidence that oxygen vacancies play an important role in the enhancement of room temperature ferromagnetic property in Cu-doped ZnO.
Mohapatra, R.K.,Mishra, U.K.,Mishra, S.K.,Mahapatra, A.,Dash, D.C. Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
A series of complexes of the type [$ML_2Cl_2$], where L=2-(o-anisylidene-2'-imino) amino benzimidazole (AIAB) and 2-(furfurylidene imino) amino benzimidazole (FIAB), M=Cu(II), Co(II), Ni(II) and Zn(II), have been synthesized and characterized on the basis of elemental analysis, thermal analysis, molar conductivity, magnetic moment, electronic, infrared, $^1H$-NMR spectral studies. The results are in consistent with bidentate chelation of ligand with azomethine nitrogen and ring nitrogen donors. All these Schiff bases and their complexes have also been screened for their antibacterial (Bacillus subtilis, Bacillus stearothermophilus, Escherichia coli and Salmonella typhi) and antifungal activities (Aspergillus niger and Aspergillus flavus).
Kim, H.I.,Lee, K.W.,Mishra, D.,Yi, K.M.,Hong, J.H.,Jun, M.K.,Park, H.K. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.6
Leached solution, generated by oxalic acid washing of spent residue hydrodesulfurization (RHDS) catalyst, was used for separation and recovery of vanadium. First of all, solvent extraction, using mixture of 20% (v/v) Alamine-336 and 5% (v/v) tri-butyl phosphate (TBP) as a phase modifier, was conducted to extract molybdenum completely at pH 0.50. Then molybdenum-free solution was used for vanadium extraction at pH 1.25 with 20% Alamine-336 and 5% TBP. Stripping of vanadium from loaded organic solution was performed with 1.5@?M H<SUB>2</SUB>SO<SUB>4</SUB> at O/A phase ratio of 5:1 where more than 99% of vanadium was stripped in two stages. The stripped vanadium solution was further processed by precipitating with ammonium hydroxide to recover ammonium-meta-vanadate which was calcined to obtain vanadium pentoxide. Finally a conceptual process was established for recovery of high purity vanadium pentoxide from oxalic acid leached solution of spent residue hydrodesulfurization (RHDS) catalyst.
New and noteworthy lichen-forming and lichenicolous fungi 5
Kondratyuk, S. Y.,Lő,kö,s, L.,Halda, J. P.,Upreti, D. K.,Mishra, G. K.,Haji Moniri, M.,Farkas, E.,Park, J. S.,Lee, B. G.,Liu, D.,Woo, J.-J.,Jayalal, R. G. U.,Oh, S.-O.,Hur, J.-S. Akademiai Kiado Zrt. 2016 Acta botanica Hungarica Vol.58 No.3