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Author: search.filters.author.Gumtapure, V.Subject: search.filters.subject.Coconut shells

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    Activated carbon-based dye-sensitized solar cell for development of highly sensitive temperature and current sensor
    (Institute of Physics Publishing helen.craven@iop.org, 2019) Dasari, K.K.; Gumtapure, V.
    Activated carbon was produced from coconut shells using steam activation method. The process followed by intermediate pyrolysis performed at 575° C. The production yields end products as carbon, biofuels and gases. The developed activated charcoal is implemented as counter electrode in demonstrating Dye Sensitised Solar Cell using naturally available sensitizer. In addition, Dye Sensitised Solar Cell based current and temperature sensors were developed for highly remote optoelectronics applications. Anthocyanin dye extracted from pomegranate juice generated maximum current of 10 mA cm-2. The characteristics of the cell was performed with different optic filters wavelength ranging 400-650 nm and the maximum efficiency was developed for wavelength of 445 nm. © 2019 IOP Publishing Ltd.
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    Upgrading of coconut shell-derived pyrolytic bio-oil by thermal and catalytic deoxygenation
    (Taylor and Francis Ltd., 2024) Dasari, K.K.; Gumtapure, V.; Dutta, S.
    The objective of this study is to upgrade the pyrolysis oil obtained from coconut shells via thermal deoxygenation and catalytic hydrodeoxygenation (HDO) and compare the elemental properties of the upgraded bio-oil samples. The crude coconut shell pyrolysis oil (cr-CSPO) was obtained in 33% yield by intermediate pyrolysis (575°C) of pre-dried coconut shells. The higher heating value (HHV) of cr-CSPO was found to be 16.46 MJ/Kg. The thermal and catalytic upgrading was done at 250°C, 30 bar of hydrogen pressure, a reaction time of 3 h, and a stirring speed of 350 rpm. In the case of catalytic upgrading, 10% Pd/C (10 wt% of cr-CSPO) was used as the catalyst. Thermally heating the cr-CSPO under identical conditions without the catalyst provided oil of HHV 25.94 MJ/kg. Catalytic HDO of the cr-PCSO showed a noticeable increase in the HHV value to 30.57 MJ/kg. The results indicate significant improvement in the combustion properties of cr-CSPO by thermal treatment and more so by the catalytic HDO chemistry. © 2020 Taylor & Francis Group, LLC.