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Mishra, Dinesh Kumar,Cho, Jin Ku,Yi, Yongjin,Lee, Hye Jin,Kim, Yong Jin Elsevier 2019 Journal of industrial and engineering chemistry Vol.70 No.-
<P><B>Abstract</B></P> <P>A series of gold (Au) nanocatalysts has been prepared for base-free protocol-oxidative esterification of lignocellulosic biomass derived 5-hydroxymethyl-2-furfural (HMF) to 2,5-furan dimethylcarboxylate (FDMC) in the presence of air. The prepared Au-based nanocatalysts are thoroughly characterized by various analytical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N<SUB>2</SUB>-physisorption (adsorption–desorption) method, inductive coupled plasma-atomic emission (ICP-AES) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Moreover, the surface properties of Au-based nanocatalysts were investigated by temperature-programmed desorption of carbon dioxide (CO<SUB>2</SUB>-TPD) technique. For a comparison point of view, the activity tests of various prepared metal-based nanocatalysts have also been carried out. Among all, hydroxyapatite (HAP) supported Au nanocatalyst (Au/HAP) prepared by homogeneous deposition–precipitation (HDP) method was found to be the best to give 89.3% yield of FDMC from oxidative esterification of HMF in the presence of air. The excellent yield of FDMC could be attributed to stronger basic sites on the surface of the catalyst. Furthermore, Au/HAP nanocatalyst was simply recovered and reused, which retained its original activity even after five consecutive times without significant loss of original activity, supporting its reusability and stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Base-free protocol-oxidative esterification of HMF to FDMC in the presence of air. </LI> <LI> Au/HAP nanocatalyst is found to be efficient for oxidative esterification of HMF. </LI> <LI> Au/HAP is prepared by simple homogeneous deposition-precipitation method. </LI> <LI> Au/HAP nanocatalyst is reused up to several consecutive times. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P> <P>A highly recyclable gold (Au) nanocatalyst has been prepared for base-free protocol-oxidative esterification of lignocellulosic biomass derived 5-hydroxymethyl-2-furfural (HMF) to 2,5-furan dimethylcarboxylate (FDMC) in the presence of air, which showed excellent yield of FDMC.</P>
Mishra, Dinesh Kumar,Dabbawala, Aasif A.,Truong, Cong Chien,Alhassan, Saeed M.,Jegal, Jonggeon,Hwang, Jin Soo Elsevier 2018 Journal of industrial and engineering chemistry Vol.68 No.-
<P><B>Abstract</B></P> <P>Lactose is a reducing disaccharide consisting of two different monosaccharides such as galactose and glucose. The hydrogenation of lactose to lactitol is a formidable challenge because it is a complex process and several side products are formed. In this work, we synthesized Ru–Ni bimetallic nanohybrids as efficient catalysts for selective lactose hydrogenation to give selective lactitol. Ru–Ni bimetallic nanohybrids with Ru–NiO<I> <SUB>x</SUB> </I> (<I>x</I> =1, 5, and 10wt%) are prepared by impregnating Ru and Ni salts precursors with TiO<SUB>2</SUB> used as support material. Ru–Ni bimetallic nanohybrids (represented as 5Ru–5NiO/TiO<SUB>2</SUB>) catalyst is found to exhibit the remarkably high selectivity of lactitol (99.4%) and turnover frequency i.e. (374h<SUP>−1</SUP>). In contrast, monometallic Ru/TiO<SUB>2</SUB> catalyst shows poor performance with (TOF=251h<SUP>−1</SUP>). The detailed characterizations confirmed a strong interaction between Ru and NiO species, demonstrating a synergistic effect on the improvement on lactitol selectivity. The impregnation-reduction method for the preparation of bimetallic Ru–NiO/TiO<SUB>2</SUB> catalyst promoted Ru nanoparticles dispersed on NiO and intensified the interaction between Ru and NiO species. Ru–NiO/TiO<SUB>2</SUB> efficiently catalyzed the hydrogenation of lactose to lactitol with high yield/selectivity at almost complete conversion of lactose at 120°C and 55bar of hydrogen (H<SUB>2</SUB>) pressure. Moreover, Ru–NiO/TiO<SUB>2</SUB> catalyst could also be easily recovered and reused up to four runs without notable change in original activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly active supported Ru–Ni bimetallic catalysts with NiO are prepared. </LI> <LI> Bimetallic Ru–5NiO/TiO<SUB>2</SUB> catalyst shows high selectivity to lactitol (99.4%). </LI> <LI> Optimization and kinetics studies of lactose hydrogenation. </LI> <LI> Bimetallic Ru–5NiO/TiO<SUB>2</SUB> catalyst is reused up to several consecutive times. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Poverty Does Not Limit Tobacco Consumption among Tribal Populations: Evidence from Central India
Kumar, Surendra,Kumar, Dinesh,Muniyandi, Malaisamy,Soan, Visheshwar,Pandey, Maya,Mishra, Dinesh Kumar Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10
Production of FDCA from HMF using mixed solvent system
( Dinesh Kumar Mishra ),조진구,소정은,김용진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Furan-2, 5-dicarboxylic acid (FDCA), an alternative of terephthalic acid (TA), is widely used as intermediates for the polymers, fine chemicals, pharmaceuticals and agrochemicals. FDCA has many applications; however, it suffers from its low productivity. For the large scale production of FDCA, the process indeed needs to be improved. Here, we introduce the production of FDCA from HMF oxidation using mixed solvent system. The oxidation of HMF to produce FDCA has been carried wherein both alcohol and aldehyde groups of HMF react with molecular oxygen over the catalyst of metals/bromide (Co/Mn/Br). To achieve maximum yield of FDCA at complete conversion of HMF, the reaction conditions were optimized by varying the reaction temperature (from 130 - 180°C), time (from 1 - 4 h) and pressure (from 600 - 900 Psi).
Dinesh Kumar Mishra,Aasif A. Dabbawala,Cong Chien Truong,Saeed M. Alhassan,Jonggeon Jegal,황진수 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Lactose is a reducing disaccharide consisting of two different monosaccharides such as galactose and glucose. The hydrogenation of lactose to lactitol is a formidable challenge because it is a complex process and several side products are formed. In this work, we synthesized Ru–Ni bimetallic nanohybrids as efficient catalysts for selective lactose hydrogenation to give selective lactitol. Ru–Ni bimetallic nanohybrids with Ru–NiOx (x = 1, 5, and 10 wt%) are prepared by impregnating Ru and Ni salts precursors with TiO2 used as support material. Ru–Ni bimetallic nanohybrids (represented as 5Ru–5NiO/TiO2) catalyst is found to exhibit the remarkably high selectivity of lactitol (99.4%) and turnover frequency i.e. (374 h−1). In contrast, monometallic Ru/TiO2 catalyst shows poor performance with (TOF = 251 h−1). The detailed characterizations confirmed a strong interaction between Ru and NiO species, demonstrating a synergistic effect on the improvement on lactitol selectivity. The impregnation-reduction method for the preparation of bimetallic Ru–NiO/TiO2 catalyst promoted Ru nanoparticles dispersed on NiO and intensified the interaction between Ru and NiO species. Ru–NiO/TiO2 efficiently catalyzed the hydrogenation of lactose to lactitol with high yield/selectivity at almost complete conversion of lactose at 120 °C and 55 bar of hydrogen (H2) pressure. Moreover, Ru–NiO/TiO2 catalyst could also be easily recovered and reused up to four runs without notable change in original activity.
Polystyrene-anchored imidazole-based ionic liquids for generating disubstituted ureas
( Dinesh Kumar Mishra ),( Hye Jin Lee ),김용진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Emission of carbon dioxide (CO2) gas causes global warming, the use of CO2 gas as carboxylating agent is interesting because of its non-toxicity and availability in nature. Polystyrene (PS)-anchored imidazole-based ionic liquids are explored as catalysts for synthesizing the disubstituted urea (DSU) products from CO2 and various amines. DSU products yields are in range of 32- 80%. The catalysts are characterized by FT-IR, XPS and elemental composition is confirmed from elemental analysis. Moreover, the catalyst shows high reusability up to at least seven consecutive cycles.
Mishra, Dinesh Kumar,Cho, Jin Ku,Kim, Yong Jin THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.60 No.-
<P><B>Abstract</B></P> <P>This work reports manganese–cobalt spinels (MnCo<SUB>2</SUB>O<SUB>4</SUB>) supported ruthenium (Ru) nanoparticles, Ru/MnCo<SUB>2</SUB>O<SUB>4</SUB>, efficiently catalyzed 5-hydroxymethyl furfural (HMF) oxidation to 2,5-diformylfuran (DFF) with high yield 98.3% at 130°C and 1.0MPa of O<SUB>2</SUB> pressure in toluene used as solvent under base-free conditions. A new class of spinels MnCo<SUB>2</SUB>O<SUB>4</SUB> having multiple valence states of Mn and Co was synthesized by using simple co-precipitation method and used as support with ruthenium nanoparticles as heterogeneous catalyst. The reusability tests of catalyst Ru/MnCo<SUB>2</SUB>O<SUB>4</SUB> were also carried out and was found to be recyclable up to several consecutive cycles without significance loss of original activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile production of DFF with 98.3% yield from base-free oxidation of HMF. </LI> <LI> Toluene is considered to be the best solvent for selective product DFF. </LI> <LI> Highly active manganese–cobalt spinels supported ruthenium nanoparticles. </LI> <LI> Ru/MnCo<SUB>2</SUB>O<SUB>4</SUB> is recyclable up to several consecutive times. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Design and Performance Study of a Hot Water Driven 5 TR Capacity Absorption Cooling System
Anil Sharma,Bimal Kumar Mishra,Abhinav Dinesh,Ashok Misra 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.6
Use of high grade electrical energy, generated from fossil fuels, for cooling has increased environmental concerns like global warming and ozone layer depletion. Hence, there is a need to reduce dependence on them and explore potential environmental friendly options. In this aspect, vapor absorption system has scope of utilizing low grade energy source i.e. hot water from solar panel, to generate cooling effect and are environment friendly as no chloro-floro-carbons are used. The most usual combination of absorber refrigerant pair in such system is lithium bromide water (LiBr–H2O), where water vapor is the refrigerant. In present work, a hot water driven, single stage, absorption cooling system, using a lithium bromide water solution, is analyzed for determining the effect of various parameters on coefficient of performance (COP). Four basic stages in the absorption cycle are generation, condensation, evaporation and absorption with ideally no moving part. A configuration of theses four stages, having 5 TR cooling capacity is determined and examined for the variation in COP corresponds to the change in pressure and concentration. The pressure parameter is varied in condenser and evaporator, resulting graph shows that the increment in pressure of evaporator increases the COP whereas increment of pressure in condenser decreases the COP. At lower inlet concentration of LiBr solution to the absorber gives increment in COP.