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Author: search.filters.author.Roy, BanasriSubject: search.filters.subject.X-Ray diffraction (XRD)

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    Development of Ni–Sn/Al2O3 Nano Catalysts for H2 Production from Biomass by Aqueous Phase Reforming
    (Igenta, 2014-07) Roy, Banasri
    Preparation and characterization of nano Ni–Sn/Al2O3 catalysts prepared by Co-precipitation technique has been reported in this paper. Two set of samples have been designed; in first one the metal/support catalyst is directly precipitated from solution mixture of precursors as one pot synthesis, while for the second one, Al2O3 support is prepared by precipitation method and then metal is loaded by standard wet impregnation. Aluminum nitrate, nickel nitrate, tin chloride, and ammonia solution are used as the starting materials. Investigations regarding the structure - property relations are being carried out through TGA, FTIR, and XRD which will be discussed in detail.
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    Synthesis of Mixed-Phase TiO2 Powders in Salt Matrix and Their Photocatalytic Activity
    (Taylor & Francis, 2016-05) Roy, Banasri
    Three mixed-phase TiO2 powders, containing ∼80 volume % anatase and ∼20 volume % rutile, were prepared from amorphous titanium hydroxide and three different salt matrices—pure sodium chloride, pure Na2CO3, and pure disodium hydrogen phosphate (DSP). Amorphous titanium hydroxide and salt mixtures were heat treated at 875°C in a rapid thermal annealing system for different times, according to the time–temperature phase transformation graphs. Time-dependent UV degradation of aqueous solutions of methylene blue dye (15 ppm) in the presence of mixed-phase powders was used to monitor the activity of the catalysts. Microstructural study of the powders by scanning electron microscope and transmission electron microscope combined with phase analysis by XRD and optical absorbance by UV-absorption spectroscopy indicated that the higher photocatalytic activity of the powder obtained from pure DSP salt could be explained by its smaller rutile particle size and anatase–rutile interparticle bonding.
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    BINIVOX catalyst for hydrogen production from ethanol by low temperature steam reforming (LTSR)
    (Springer, 2017-11) Roy, Banasri; Mohanta, Hare Krishna
    Nickel doped bismuth vanadate [;BINIVOX] calcined at (BINIVOX-800) catalyst is prepared by a solution combustion method. The catalytic activity study is carried in the temperature range of 250–, and with the molar feed ratios of water: ethanol at 23:1 and 2.5:1. The study reveals an increase in the ethanol conversion and selectivity of carbon dioxide & hydrogen but a decrease in the selectivity of carbon monoxide and methane with an increase in temperature and water: ethanol mole ratio. Fresh and used catalysts are characterized using DTA, TGA, XRD and FTIR. XRD results reveal that the fresh catalyst is phase pure γ-BINIVOX. The phase purity and crystallinity of the catalyst is retained after 30 h of activity study.