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Transition metal-based single-atom catalysts(TM-SACs);rising materials for electrochemical CO_(2) reduction

Journal of Energy Chemistry 2022年第7期31卷 444-471,I0012页

作者： Bishnupad mohanty Suddhasatwa Basu Bikash kumar Jena Materials Chemistry Department CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India Academy of Scientific&Innovative Research(AcSIR) Ghaziabad 201002India

The continuous increase of global atmospheric CO_(2) concentrations brutally damages our environment. A series of methods have been developed to convert CO_(2) to valuable fuels and value-added chemicals to maintain the equilibrium of carbon cycles. The electrochemical CO_(2) reduction reaction(CO_(2)RR) is one of the promising methods to produce fuels and chemicals, and it could offer sustainable paths to decrease carbon intensity and support renewable energy. Thus, significant research efforts and highly efficient catalysts are essential for converting CO_(2) into other valuable chemicals and fuels. Transition metal-based single atoms catalysts(TM-SACs) have recently received much attention and offer outstanding electrochemical applications with high activity and selectivity opportunities. By taking advantage of both heterogeneous and homogeneous catalysts, TM-SACs are the new rising star for electrochemical conversion of CO_(2) to the value-added product with high selectivity. In recent years, enormous research effort has been made to synthesize different TM-SACs with different M–Nxsites and study the electrochemical conversion of CO_(2) to CO. This review has discussed the development and characterization of different TMSACs with various catalytic sites, fundamental understanding of the electrochemical process in CO_(2) RR,intrinsic catalytic activity, and molecular strategics of SACs responsible for CO_(2)RR. Furthermore, we extensively review previous studies on 1 st-row transition metals TM-SACs(Ni, Co, Fe, Cu, Zn, Sn) and dual-atom catalysts(DACs) utilized for electrochemical CO_(2) conversions and highlight the opportunities and challenges.

关键词： CO_(2)RR Single-atom catalyst SACs Dual-atom catalyst DACs Transition metals Support catalysts

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Potassium recovery from muscovite using NaCl-roasting followed by H_(2)SO_(4)-leaching

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Journal of Central South University 2022年第6期29卷 1881-1894页

作者： Sandeep kumar JENA Baijayantimala mohanty Geetikamayee PADHY Jogeshwara SAHU Sapan kumar KANDI CSIR-Institute of Minerals and Materials Technology BhubaneswarOdisha-751013India

The present study aims at the recovery of potassium from muscovite mica(which contains K_(2)O;~10 wt%)using NaCl-roasting coupled with H_(2)SO_(4)-leaching *** preliminary acid leaching studies applying different mineral acids resulted in a potassium recovery of 8%−18%.The optimum leaching conditions for the maximum recovery were 4 mol/L H_(2)SO_(4),60 min leaching time and liquid-solid ratio 4 mL/g at 90℃.However,the roasting of muscovite with additive NaCl(muscovite:NaCl mass ratio of 1:1.00,900℃,45 min)followed by H_(2)SO_(4)-leaching(95℃,60 min)extracted potassium to the tune of 98%.Under similar roasting conditions,the H_(2)O-leaching process extracted only 60%of *** effects of various roasting and leaching parameters such as temperature,time,NaCl concentration,acid concentration,liquid-solid ratio on potassium extraction were *** appearance of the sylvite(KCl)mineral phase in the NaCl-roasted muscovite and its disappearance in the acid/water leached residue confirmed the physical and chemical distortions of the muscovite crystal *** possible mechanism of potassium release from the complex muscovite structure was elucidated based on available literature substantiated by characterizations using X-ray diffraction(XRD)and scanning electron microscopy with energy dispersive X-rays spectroscopy(SEM-EDX).

关键词： muscovite roasting acid leaching potassium recovery sylvite

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Bio-oil and biochar production using thermal and catalytic pyrolysis of low-value waste neem seeds over low-cost catalysts:effects of operating conditions on product yields and studies of physicochemical characteristics of bio-oil and biochar

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Biochar 2021年第4期3卷 641-656页

作者： Ranjeet kumar Mishra Kaustubha mohanty Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

This study addressed a comparative assessment of the effect of low-cost catalysts on the yield and physicochemical properties of *** and catalytic pyrolysis of neem seeds(NM)was conducted in a fixed bed semi-batch reactor at optimum conditions(550°C temperature,80°C min−1 heating rate,0.5 mm particle size,and 100 mL min−1 sweep gas flow rate).The produced bio-oil and biochar were characterized through thermal stability,elemental composition(CHNS),higher heating value(HHV),Nuclear Magnetic Resonance(NMR)spectroscopy,Field Emission Scanning Electron Microscopy(FESEM),Fourier-transform infrared spectroscopy(FTIR),Gas Chromatography-Mass Spectrometry(GC-MS),zeta potential,water-holding capacity(WHC),and BET(Brunauer,Emmett and Teller)surface area ***,it was noticed that the use of catalysts at optimized condition substantially boosted the quality and yield of *** results established that thermal pyrolysis yielded 49.53 wt.%of bio-oil,while catalytic pyrolysis yielded(51.25 wt.%,53.12 wt.%,48.68 wt.%,and 50.65 wt.%for MgO,NaOH,Al_(2)O_(3),and ZSM-5,respectively)at 20 wt.%catalyst *** physicochemical study of bio-oil confirmed improved properties of bio-oil in terms of viscosity,heating value,pH and carbon ***,the FTIR study of bio-oil indicates the occurrence of phenolic products,aromatics,ketones,acidic compounds,esters,alcohol and aldehyde impurities,whereas 1H NMR study supported FTIR ***-MS study demonstrated that the introduc-tion of catalysts significantly reduced the oxygenated substances,acidic products,phenolic compounds and substantially increased the ***,characterization results of neem seed biochar(NMC)established the existence of HHV(23.26 MJ kg^(−1)),carbon content(62.66%),zeta potential(31.68 mV),water holding capacity(41.50%)and lower BET surface area(4.60 m^(2)g^(−1)).

关键词： Waste neem seeds Pyrolysis Catalysts Bio-fuel GC–MS FTIR 1H NMR Biochar FESEM

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Co-pyrolysis of waste biomass and waste plastics(polystyrene and waste nitrile gloves)into renewable fuel and value-added chemicals

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Carbon Resources Conversion 2020年第1期3卷 145-155页

作者： Ranjeet kumar Mishra Kaustubha mohanty Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

The present study addresses the influence of blending of waste plastics(i.e.,polystyrene,PS and waste nitrile gloves,WNG)with mahua seeds(MH)for co-pyrolytic liquid yield and its fuel *** blends of waste plastics were mixed with biomass(10,20 and 30 wt%)and pyrolyzed in a semi-batch reactor at an optimized environment(550℃ temperature,80℃ min^(-1) heating rate,and 100 mL min^(-1) N_(2) flow rate).Physicochemical results displayed its ability to yield renewable fuel and valuable ***-pyrolysis outcomes showed that blending of waste plastics at 20 wt%,yielded maximum liquid(44.18±1.2 wt%and 45.89±1.4 wt%for MH+WNG and MH+PS respectively)which was higher than thermal pyrolysis of individual MH(39.26±1.2 wt%).Further,characterization results revealed a substantial reduction in viscosity,oxygen content,moisture,and a positive increment in gross heating value,carbon content and *** examination exposed the attendance of mainly aromatics,acids,phenols,water,esters and ***,NMR analysis of pyrolytic oil confirmed an increase in aromaticity by blending of waste plastics(20 wt%)while there was a reduction in paraffinic ***-MS investigation revealed substantial improvement in hydrocarbons and minimization in the oxygen-rich products by blending of waste plastics at 20 wt%.

关键词： Waste biomass Plastics Co-pyrolysis Pyrolytic oil Fuel characterization

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Electrical conductivity of Gd doped BiFeO3-PbZrO3 composite

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Frontiers of Materials Science 2013年第3期7卷 295-301页

作者： Santosh kumar SATPATHY Nilaya kumar mohanty Ajay kumar BEHERA Banarji BEHERA Pratibindhya NAYAK Materials Research Laboratory School of Physics Sambalpur University Jyoti Vihar Burla-768019 Odisha India

The composite, 0.5（BiGd0.15Fe0.85O3）-0.5（PbZrO3）, was synthesized using the solid-state reaction technique. The formation of the compound was confirmed by XRD with an orthorhombic structure at room temperature. The impedance parameters were studied using an impedance analyzer in a wide range of frequency （10z-106Hz） at different temperatures. The Nyquist plot suggests the contribution of bulk effect and a slight indication of grain boundary effect and the bulk resistance decreases with a rise in temperature. The presence of temperature-dependent relaxation process occurs in the material. Electrical modulus reveals the presence of the hopping mechanism in the materials. The value of exponent n, pre-factor A and adc were obtained by fitting ac conductivity data with Jonscher＇s universal power law. The activation energies calculated from the ac conductivity were found to be 0.50, 0.46, 0.44, 0.43, 0.42 and 0.38 eV at 1, 10, 50, 100, 500 kHz and I MHz respectively in the temperature region of 110℃-350℃. The dc conductivity was found to increase with the rise in temperature. The activation energy calculated from complex impedance plot and from the fitted Jonscher＇s power law are very close, which results similar type of charge carrier exist in conduction mechanism of the material.

关键词： solid state reaction XRD impedance electrical conductivity

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Myanmar-Andaman-Sumatra Subduction Margin Revisited:Insights of Arc-Specific Deformations

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Journal of Earth Science 2017年第4期28卷 683-694页

作者： Prosanta kumar Khan Sk Shamim Manoranjan mohanty Prabhat kumar Jayashree Banerjee Department of Applied Geophysics Indian Institute of Technology(ISM)Dhanbad 826 004India

We address the role of the concave and convex arcs （as observed from the subducting plate） on the deformation occurring along the Myanmar-Andaman-Sumatra margin. We categorize the pre- and post-seismic deformations of the lithosphere using earthquake database occurring either prior to 26th December 2004 Mw 9.3 off-Sumatra mega-event or after the incidence. Analysis under pre-seismic domain shows that area near Sumatra records highest seismicity, which largely drops in the area past the North Andaman, and further increases towards north. Shallowest depth and mini- mum dip of the subducting lithosphere is recorded at the central segment where the arc transformed into concave shape. The annual moment energy release during earthquake decreases to more than two orders of magnitude past the North Andaman towards north under post-seismic deformation phase. Higher depths of continuity of events are presumably associated with more dipping Benioff zones in both the Indo-Myanmar and Andaman-Nicobar convex arcs. These observations obviously account for tectonic subdivision of the margin near concave shape arc around the central part. Absence of vol- canism, presence of splay faults in the back-arc, sharp reduction in seismicity near central segment are interpreted to be caused by major tectonic impact of the NNE-ward converging buoyant Ninety-east Ridge against the Asian Plate. Shallowest dip, small elastic thickness, weak converging Indian litho- sphere, and evidences of series of en-echelon blocks off the eastern side of the broken northern Ninety- east Ridge might be incapable of generating great earthquake in this area.

关键词： Myanmar-Andaman-Sumatra margin double arc Ninety-east Ridge buoyancy.

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Chlorination roasting-coupled water leaching process for potash recovery from waste mica scrap using dry marble sludge powder and sodium chloride

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1203-1215页

作者： Sandeep kumar Jena Jogeshwar Sahu Geetikamayee Padhy Swagatika mohanty Ajit Dash Mineral Processing and Central Characterization Department Council of Scientific and Industrial Research(CSIR)-Institute of Minerals and Materials Technology(IMMT)BhubaneswarOdisha 751013India

The present paper reports the effective utilization of marble sludge powder(MSP)for the recovery of potash values from waste mica scrap using chlorination roasting-water leaching *** studies indicated the presence of dolomite as the major mineral phase in MSP,whereas muscovite and quartz were observed in the mica *** acid leaching studies suggest a maximum of 22%potash recovery under conditions:4 M H2SO4 acid,particle size of^100μm,stirring speed of 600 r/min,leaching temperature of 75℃,and leaching time of 90 *** chlorination roasting-water leaching process was adopted to achieve the lowest level of 80%-90%potash *** optimum conditions for the recovery of^93%potash from mica(~8.6wt%K2O)requires 900℃ roasting temperature,30 min roasting time,and 1:1:0.75 mass ratio of mica:MSP:*** roasting temperature and amount of NaCl are found to be the most important factors for the recovery *** reaction mechanism suggests the formation of different mineral phases,including sylvite(KCl),wollastonite,kyanite,and enstatite,during roasting,which were confirmed by X-ray diffraction(XRD)analyses and scanning electron microscopy(SEM)*** MSP-blended NaCl additive is more effective for potash recovery compared with the other reported commercial roasting additives.

关键词： potash recovery mica scrap marble sludge powder chlorination roasting water leaching

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Shear Strength and Morphological Study of Polyurethane- OMMT Clay Nanocomposite Adhesive Derived from Vegetable Oil-Based Constituents

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Journal of Renewable Materials 2018年第1期6卷 117-125页

作者： Swarnalata Sahoo Hemjyoti Kalita Smita mohanty Sanjay kumar Nayak Central Institute of Plastic Engineering and Technology ChennaiTamil Nadu 600032India Laboratory for Advanced Research in Polymeric Materials(LARPM) CIPETBhubaneswar 751024 India and ChennaiTamil Nadu 600032India

In the current work,we have synthesized vegetable oil-based polyurethane-OMMT clay nanocomposite(PUNC)adhesive with the incorporation of different wt%of organically modified nanoclay(1 to 5 wt%)into the biobased polyurethane(PU)matrix through in-situ polymerization process via ultrasonication *** the initial stage,PU adhesive was prepared using polyol and partially biobased aliphatic isocyanate,wherein polyol was derived from the transesterified castor oil using ethylene *** formation of PU and PUNC adhesive was confirmed using Fourier transform infrared(FTIR)spectroscopy *** tensile strength of PU with different wt%of nanoclay was determined and the analysis showed that the loading of 3 wt%of nanoclay within the PU matrix showed better performance as compared to the ***,shear strength of PU and PUNC(3 wt%nanoclay)adhesives were determined using lap shear test,in which PUNC adhesive showed higher adhesive strength at 70°***,the dispersibility of OMMT nanoclay within the PU matrix along with exfoliation and amorphous structure was confirmed through wide angle X-ray diffractometer(WAXD)and transmission electron microscopy(TEM)*** phase separation structure was analyzed using dynamic mechanical analysis(DMA).The analysis revealed that with the addition of organically modified nanoclay in the PU matrix,the glass transition temperature(Tg)of the damping curve was shifted towards higher temperature.

关键词： Biobased raw material composite material green strength gel time DMA

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Graphene sandwiched crumb rubber dispersed hot mix asphalt

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第5期7卷 652-667页

作者： Bineet Baliyar Singh Fanismita mohanty Sudhanshu Sekhar Das Sarat kumar Siuain Department of Civil Engineering Veer Surendra Sai University of TechnologyBurla 768018India Department of Chemistry Veer Surendra Sai University of TechnologyBurla 768018India

The crumb rubber obtained from discarded vehicle tires and graphene oxide prepared by oxidation of graphite powder in laboratory were used to modify virgin bitumen. Four different hot mix asphalt matrices prepared using virgin bitumen, crumb rubber modified bitumen, graphene oxide modified bitumen and combination of crumb rubber-graphene oxide modified bitumen are compared. The modified bitumen matrices are characterised by Fourier transform infrared spectroscopy and scanning electron microscopy for structural and morphological analysis. Marshall properties along with indirect tensile test and tensile strength ratio tests were carried out to check the resistance towards cracking and moisture susceptibility of matrices. The results show that, crumb rubber and graphene oxide are completely compatible with bitumen. 9.8% crumb rubber content in crumb rubber modified bitumen hot mix asphalt exhibits the optimum result. The performance of graphene oxide modified bitumen hot mix asphalt exhibits superior performance in comparison to control mix and crumb rubber modified bitumen hot mix asphalt *** enhanced properties of modified bitumen hot mix asphalt with the combining effect of graphene oxide and crumb rubber, are suitable for road construction.

关键词： Hot mix asphalt Crumb rubber Graphene oxide Modified bitumen

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Recovery of metals and other beneficial products from coal fly ash： a sustainable approach for fly ash management

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International Journal of Coal Science & Technology 2016年第3期3卷 267-283页

作者： prafulla kumar Sahoo Kangjoo Kim M. A. Powell Sk Md Equeenuddin Vale Institute of Technology Baventura da Silva BelemPara 66055-090 Brazil Department of Environmental Engineering Kunsan NationalUniversity Jeonbuk 573-701 Republic of Korea Prometeo SDIC Secretary of Higher Education ScienceTechnology and Innovation (SENESCYT) Quito Ecuador Department of Mining Engineering National Institute ofTechnology Rourkela Orissa 769008 India

Increasing production and disposal of coal fly ash （CFA） is a matter of serious environment concern. However, CFA contains various beneficial metals and mineral matters whose demand is increasing in the industrialized world, while natural supplies are diminishing. Therefore, recovery of these potential resources from CFA can be an alternative way to save mineral resources, as well as to reduce the environmental burden of CFA disposal. There are numerous methods developed for the recovery of beneficial products from CFA. Based on the US patents and journal literatures, the present review describes the recovery status and technologies of major elements such as Al, Si, Fe and Ti, and trace elements such as V, Ga, Ge, Se, Li, Mo, U, Au, Ag, Pt groups and rare earth elements （REEs） and other beneficial products such as magnetic materials, cenospheres, and unburned carbon from CFA. It also highlights the recovery efficiency and drawbacks for their extraction, and suggests future research to develop satisfactory results in terms of selective recovery and purification.

关键词： Coal fly ash Beneficial elements Recovery Hydrometallurgical methods Extraction efficiency

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