Nishita Lucas - Academia.edu (original) (raw)
Papers by Nishita Lucas
Microporous and Mesoporous Materials, Nov 1, 2013
ChemistrySelect
In the present study, regenerated cellulose fibres are functionalized with hydrolysed collagen fr... more In the present study, regenerated cellulose fibres are functionalized with hydrolysed collagen from marine and bovine sources by surface treatment approach. A comparative study of collagen source is undertaken for the first time. Collagen infused fibres are subjected to various characterization like Fourier transform Infrared spectroscopy, X‐ray diffraction, Scanning electron microscopy, Thermogravimetric analysis, Nitrogen estimation, water holding capacity studies and antistatic measurements. Performance studies were also undertaken to evaluate their benefits. Marine collagen obtained from bones, with lower loading (∼2 wt %) is found to be optimum. Collagen infusion renders significant improvement in ultraviolet protection factor, antistaticity and water holding capacity which makes the material a sustainable and premium choice for functional textiles. Evaluation of the fabric properties reveals an enhancement in shelf life and freshness of commodities. Usage of collagen, obtained...
Waste and Biomass Valorization
Please note that technical editing may introduce minor changes to the text and/or graphics, which... more Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal’s standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. Accepted Manuscript Catalysis Science & Technology
Journal of Porous Materials, 2020
5-Hydroxymethyl furfural (HMF) is one of the important platform chemical obtained from C6 sugars ... more 5-Hydroxymethyl furfural (HMF) is one of the important platform chemical obtained from C6 sugars derived from biomass. The efficiency of montmorillonite clay catalysts (K-10, K-20, K-30, and Al pillared clay) has been systematically explored for the synthesis of HMF through dehydration of fructose in a biphasic solvent system. The catalysts were characterized by XRD, N 2 sorption, 27 Al MAS NMR, 29 Si NMR and FT-IR of chemisorbed pyridine. Acid treated K-10 catalyst was found to be the best among the clay catalysts tested. Various reaction parameters such as reaction temperature, catalyst content, solvent were optimized for achieving better yield of HMF. Under optimized reaction conditions, K-10 catalyst affords 80 mol% fructose conversion with HMF yield of 61 mol%. Insight into the type of acid sites essential for such cascade reactions has been furnished. Utilization of clay catalysts for HMF production will be beneficial to improve overall economics for the production of platform chemicals like HMF from biomass-derived raw materials.
Molecular Catalysis, 2020
Sustainability and Green Chemistry has emerged as catchphrase in modern era and researchers world... more Sustainability and Green Chemistry has emerged as catchphrase in modern era and researchers worldwide have embraced it as new paradigm of development. In this context identifying potential materials able to curb multiple grave issues thus contributing towards sustainability is vital. Catalytic materials are quite potent for addressing current social, economic and environmental problems like harnessing alternative energy source, pollution prevention/remediation and manufacturing of commodity chemicals. Thus, the present review accentuates the efficacy of porous octahedral molecular sieves (OMS) as catalyst for such environmentally important reactions. It discusses about structural importance of OMS and their applications for green and sustainable catalytic reactions. Finally, the limitations are highlighted and future perspectives are presented which will ameliorate its catalytic utilization in energy and environmental domains.
Sustainable Energy & Fuels, 2020
Highly dispersed Ru nanoparticles supported on N-doped mesoporous carbon demonstrated an admirabl... more Highly dispersed Ru nanoparticles supported on N-doped mesoporous carbon demonstrated an admirable catalytic activity in catalytic transfer hydrogenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran and furfural to 2-methylfuran.
ACS Applied Materials & Interfaces, 2017
The work here presents a thorough evaluation of the effect of Mn-Na-W/SiO 2 catalyst surface para... more The work here presents a thorough evaluation of the effect of Mn-Na-W/SiO 2 catalyst surface parameters on its performance in the oxidative coupling of methane (OCM). To do so, we used microporous dealuminated β-zeolite (Zeo), or mesoporous SBA-15 (SBA) or macroporous fumed silica (Fum) as precursors for catalyst preparation together with Mn nitrate or Mn acetate and Na 2 WO 4. Characterizing the catalysts by ICP-OES, N 2-physisorption, XRD, HR-SEM-EDS, XPS and catalytic testing enabled us to identify critical surface parameters that govern the activity and C 2 selectivity of the Mn-Na-W/SiO 2 catalyst. While the current paradigm views the phase-transition of silica to α-cristobalite as the critical step in obtaining dispersed and stable metal sites, we show that the choice of precursors is equally or even more important with respect to tailoring the right surface properties. Specifically, the SBA based catalyst, characterized by relatively closed surface porosity, demonstrated low activity and low C 2
Journal of Porous Materials, 2019
A comparative study of different heteropoly acids supported on mesoporous AlSBA-15 for the synthe... more A comparative study of different heteropoly acids supported on mesoporous AlSBA-15 for the synthesis of ethyl levulinate has been undertaken for the first time. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma-optical emission spectrometry, thermo gravimetric analysis, temperature programmed desorption of NH 3 and N 2 sorption studies. Insights into crucial parameters for the esterification reactions are also furnished. A distinct correlation was observed between acid density and conversion revealing that the distribution of acidic sites and their accessibility by the reactant moieties plays an important role in determining the overall activity. The effects of various reaction parameters were investigated to enhance the catalytic activity and yield of ethyl levulinate. Under the optimized conditions, levulinic acid conversion of 87.4 mol% and ethyl levulinate selectivity of 100% could be obtained with silicotungstic acid supported on AlSBA-15.
Microporous and Mesoporous Materials, 2017
A comparative study of precursor effect on manganese post-synthetic incorporation into the T-site... more A comparative study of precursor effect on manganese post-synthetic incorporation into the T-sites of dealuminated βzeolite, Microporous and Mesoporous Materials (2017),
Journal of Catalysis, 2016
Metal-support interfaces play a very important role in heterogeneous catalysis. The interfacial i... more Metal-support interfaces play a very important role in heterogeneous catalysis. The interfacial interactions not only are responsible for stabilizing the necessary oxidation state to facilitate the reaction but also enhance the stability of the catalyst system. Nano dispersion of Ni on mesoporous nitrogen-rich carbon material has been achieved using two different synthesis methods. It was observed that nickel (0) gets stabilized by strong interfacial interaction with the nitrogen atoms of the support material, and the material was found to be very economic and efficient for the conversion of HMF to DMF in aqueous medium. The material shows P99% conversion to 5-(hydroxymethyl) furfural (HMF) within 6 h of reaction with 98.7% DMF selectivity. A unique correlation between synthesis methods and particle sizes with catalytic performance has been observed for these newly developed materials. Furthermore, a DFT calculation has been performed to predict the reaction mechanism.
ACS Sustainable Chemistry & Engineering, 2015
An efficient catalytic process for the selective conversion of biomass-derived 5-hydroxymethylfur... more An efficient catalytic process for the selective conversion of biomass-derived 5-hydroxymethylfurfural (HMF) to high quality liquid fuel 2,5-dimethylfuran (DMF) was achieved over Ru nanoparticles dispersed on NaY zeolite. The structural and morphological features of the catalysts were studied by using various physicochemical characterization techniques. HMF conversion of 100 mol % with 78 mol % DMF yield was achieved using 2 wt %Ru–NaY catalyst in a short duration of the reaction. This catalyst displayed excellent recyclability without any loss in activity when it was used for five times. The study clearly showed that well-dispersed Ru nanoparticles are highly active and selective for the conversion of HMF to DMF. The reaction pathway for the conversion of HMF to DMF was explored by monitoring the reaction intermediates at different stages and intervals of the reaction.
Advanced Porous Materials, 2014
Advanced Porous Materials, 2013
Catalysis Science & Technology, 2015
Ruthenium nanoparticle-containing hydrotalcite catalysts work efficiently for the conversion of b... more Ruthenium nanoparticle-containing hydrotalcite catalysts work efficiently for the conversion of biomass-derived HMF into liquid fuel 2,5-dimethylfuran.
Journal of Chemical Sciences, 2014
Journal of Molecular Catalysis A: Chemical, 2008
Catalysis Letters, 2008
MoO 3 /SiO 2 composite with varying amounts of MoO 3 loading (1-20 wt.%) were prepared by sol-gel... more MoO 3 /SiO 2 composite with varying amounts of MoO 3 loading (1-20 wt.%) were prepared by sol-gel method and calcined at 500°C. These catalysts were employed for the liquid phase condensation of anisole with paraformaldehyde. All the catalysts were characterized by N 2 sorption, XRD, and NH 3-TPD. The activities of synthesized MoO 3 /SiO 2 catalysts were compared with p-toluene sulfonic acid (p-TSA), the most frequently used catalyst for the condensation reactions, and with a supported metal oxide (WO x /ZrO 2). Under the similar reaction conditions, synthesized 10 wt.% MoO 3 /SiO 2 catalyst calcined at 500°C was found to be the most active in the condensation of anisole with paraformaldehyde.
Catalysis Communications, 2008
Titania supported silicotungstic acid (STA) with different STA loading (1025 wt%) and calcinatio... more Titania supported silicotungstic acid (STA) with different STA loading (1025 wt%) and calcination temperature (650750 °C) were prepared by wet impregnation method. The catalysts have been represented by a general formula xSTiO 2 y (where x denotes wt%, S denotes STA and y ...
Microporous and Mesoporous Materials, Nov 1, 2013
ChemistrySelect
In the present study, regenerated cellulose fibres are functionalized with hydrolysed collagen fr... more In the present study, regenerated cellulose fibres are functionalized with hydrolysed collagen from marine and bovine sources by surface treatment approach. A comparative study of collagen source is undertaken for the first time. Collagen infused fibres are subjected to various characterization like Fourier transform Infrared spectroscopy, X‐ray diffraction, Scanning electron microscopy, Thermogravimetric analysis, Nitrogen estimation, water holding capacity studies and antistatic measurements. Performance studies were also undertaken to evaluate their benefits. Marine collagen obtained from bones, with lower loading (∼2 wt %) is found to be optimum. Collagen infusion renders significant improvement in ultraviolet protection factor, antistaticity and water holding capacity which makes the material a sustainable and premium choice for functional textiles. Evaluation of the fabric properties reveals an enhancement in shelf life and freshness of commodities. Usage of collagen, obtained...
Waste and Biomass Valorization
Please note that technical editing may introduce minor changes to the text and/or graphics, which... more Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal’s standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. Accepted Manuscript Catalysis Science & Technology
Journal of Porous Materials, 2020
5-Hydroxymethyl furfural (HMF) is one of the important platform chemical obtained from C6 sugars ... more 5-Hydroxymethyl furfural (HMF) is one of the important platform chemical obtained from C6 sugars derived from biomass. The efficiency of montmorillonite clay catalysts (K-10, K-20, K-30, and Al pillared clay) has been systematically explored for the synthesis of HMF through dehydration of fructose in a biphasic solvent system. The catalysts were characterized by XRD, N 2 sorption, 27 Al MAS NMR, 29 Si NMR and FT-IR of chemisorbed pyridine. Acid treated K-10 catalyst was found to be the best among the clay catalysts tested. Various reaction parameters such as reaction temperature, catalyst content, solvent were optimized for achieving better yield of HMF. Under optimized reaction conditions, K-10 catalyst affords 80 mol% fructose conversion with HMF yield of 61 mol%. Insight into the type of acid sites essential for such cascade reactions has been furnished. Utilization of clay catalysts for HMF production will be beneficial to improve overall economics for the production of platform chemicals like HMF from biomass-derived raw materials.
Molecular Catalysis, 2020
Sustainability and Green Chemistry has emerged as catchphrase in modern era and researchers world... more Sustainability and Green Chemistry has emerged as catchphrase in modern era and researchers worldwide have embraced it as new paradigm of development. In this context identifying potential materials able to curb multiple grave issues thus contributing towards sustainability is vital. Catalytic materials are quite potent for addressing current social, economic and environmental problems like harnessing alternative energy source, pollution prevention/remediation and manufacturing of commodity chemicals. Thus, the present review accentuates the efficacy of porous octahedral molecular sieves (OMS) as catalyst for such environmentally important reactions. It discusses about structural importance of OMS and their applications for green and sustainable catalytic reactions. Finally, the limitations are highlighted and future perspectives are presented which will ameliorate its catalytic utilization in energy and environmental domains.
Sustainable Energy & Fuels, 2020
Highly dispersed Ru nanoparticles supported on N-doped mesoporous carbon demonstrated an admirabl... more Highly dispersed Ru nanoparticles supported on N-doped mesoporous carbon demonstrated an admirable catalytic activity in catalytic transfer hydrogenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran and furfural to 2-methylfuran.
ACS Applied Materials & Interfaces, 2017
The work here presents a thorough evaluation of the effect of Mn-Na-W/SiO 2 catalyst surface para... more The work here presents a thorough evaluation of the effect of Mn-Na-W/SiO 2 catalyst surface parameters on its performance in the oxidative coupling of methane (OCM). To do so, we used microporous dealuminated β-zeolite (Zeo), or mesoporous SBA-15 (SBA) or macroporous fumed silica (Fum) as precursors for catalyst preparation together with Mn nitrate or Mn acetate and Na 2 WO 4. Characterizing the catalysts by ICP-OES, N 2-physisorption, XRD, HR-SEM-EDS, XPS and catalytic testing enabled us to identify critical surface parameters that govern the activity and C 2 selectivity of the Mn-Na-W/SiO 2 catalyst. While the current paradigm views the phase-transition of silica to α-cristobalite as the critical step in obtaining dispersed and stable metal sites, we show that the choice of precursors is equally or even more important with respect to tailoring the right surface properties. Specifically, the SBA based catalyst, characterized by relatively closed surface porosity, demonstrated low activity and low C 2
Journal of Porous Materials, 2019
A comparative study of different heteropoly acids supported on mesoporous AlSBA-15 for the synthe... more A comparative study of different heteropoly acids supported on mesoporous AlSBA-15 for the synthesis of ethyl levulinate has been undertaken for the first time. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma-optical emission spectrometry, thermo gravimetric analysis, temperature programmed desorption of NH 3 and N 2 sorption studies. Insights into crucial parameters for the esterification reactions are also furnished. A distinct correlation was observed between acid density and conversion revealing that the distribution of acidic sites and their accessibility by the reactant moieties plays an important role in determining the overall activity. The effects of various reaction parameters were investigated to enhance the catalytic activity and yield of ethyl levulinate. Under the optimized conditions, levulinic acid conversion of 87.4 mol% and ethyl levulinate selectivity of 100% could be obtained with silicotungstic acid supported on AlSBA-15.
Microporous and Mesoporous Materials, 2017
A comparative study of precursor effect on manganese post-synthetic incorporation into the T-site... more A comparative study of precursor effect on manganese post-synthetic incorporation into the T-sites of dealuminated βzeolite, Microporous and Mesoporous Materials (2017),
Journal of Catalysis, 2016
Metal-support interfaces play a very important role in heterogeneous catalysis. The interfacial i... more Metal-support interfaces play a very important role in heterogeneous catalysis. The interfacial interactions not only are responsible for stabilizing the necessary oxidation state to facilitate the reaction but also enhance the stability of the catalyst system. Nano dispersion of Ni on mesoporous nitrogen-rich carbon material has been achieved using two different synthesis methods. It was observed that nickel (0) gets stabilized by strong interfacial interaction with the nitrogen atoms of the support material, and the material was found to be very economic and efficient for the conversion of HMF to DMF in aqueous medium. The material shows P99% conversion to 5-(hydroxymethyl) furfural (HMF) within 6 h of reaction with 98.7% DMF selectivity. A unique correlation between synthesis methods and particle sizes with catalytic performance has been observed for these newly developed materials. Furthermore, a DFT calculation has been performed to predict the reaction mechanism.
ACS Sustainable Chemistry & Engineering, 2015
An efficient catalytic process for the selective conversion of biomass-derived 5-hydroxymethylfur... more An efficient catalytic process for the selective conversion of biomass-derived 5-hydroxymethylfurfural (HMF) to high quality liquid fuel 2,5-dimethylfuran (DMF) was achieved over Ru nanoparticles dispersed on NaY zeolite. The structural and morphological features of the catalysts were studied by using various physicochemical characterization techniques. HMF conversion of 100 mol % with 78 mol % DMF yield was achieved using 2 wt %Ru–NaY catalyst in a short duration of the reaction. This catalyst displayed excellent recyclability without any loss in activity when it was used for five times. The study clearly showed that well-dispersed Ru nanoparticles are highly active and selective for the conversion of HMF to DMF. The reaction pathway for the conversion of HMF to DMF was explored by monitoring the reaction intermediates at different stages and intervals of the reaction.
Advanced Porous Materials, 2014
Advanced Porous Materials, 2013
Catalysis Science & Technology, 2015
Ruthenium nanoparticle-containing hydrotalcite catalysts work efficiently for the conversion of b... more Ruthenium nanoparticle-containing hydrotalcite catalysts work efficiently for the conversion of biomass-derived HMF into liquid fuel 2,5-dimethylfuran.
Journal of Chemical Sciences, 2014
Journal of Molecular Catalysis A: Chemical, 2008
Catalysis Letters, 2008
MoO 3 /SiO 2 composite with varying amounts of MoO 3 loading (1-20 wt.%) were prepared by sol-gel... more MoO 3 /SiO 2 composite with varying amounts of MoO 3 loading (1-20 wt.%) were prepared by sol-gel method and calcined at 500°C. These catalysts were employed for the liquid phase condensation of anisole with paraformaldehyde. All the catalysts were characterized by N 2 sorption, XRD, and NH 3-TPD. The activities of synthesized MoO 3 /SiO 2 catalysts were compared with p-toluene sulfonic acid (p-TSA), the most frequently used catalyst for the condensation reactions, and with a supported metal oxide (WO x /ZrO 2). Under the similar reaction conditions, synthesized 10 wt.% MoO 3 /SiO 2 catalyst calcined at 500°C was found to be the most active in the condensation of anisole with paraformaldehyde.
Catalysis Communications, 2008
Titania supported silicotungstic acid (STA) with different STA loading (1025 wt%) and calcinatio... more Titania supported silicotungstic acid (STA) with different STA loading (1025 wt%) and calcination temperature (650750 °C) were prepared by wet impregnation method. The catalysts have been represented by a general formula xSTiO 2 y (where x denotes wt%, S denotes STA and y ...