Thermal decomposition of (NH4)(2)SO4 in presence of Mn3O4

    Authors

    L. Q. Mao; A. T-Raissi; C. P. Huang;N. Z. Muradov

    Comments

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    Abbreviated Journal Title

    Int. J. Hydrog. Energy

    Keywords

    Hybrid cycle; Water-splitting cycle; (NH4)(2)SO4; Mn3O4; Thermal; decomposition; HYDROGEN-PRODUCTION; THERMOCHEMICAL CYCLES; SOLAR; WATER; Chemistry, Physical; Electrochemistry; Energy & Fuels

    Abstract

    The main objective of this work is to develop a hybrid water-splitting cycle that employs the photon component of sunlight for production of H-2 and its thermal (i.e. IR) component for generating oxygen. In this paper, (NH4)(2)SO4 thermal decomposition in the presence of Mn3O4, as an oxygen evolving step, was systematically investigated using thermogravimetric/differential thermal analyses (TG/DTA), temperature programmed desorption (TPD) coupled with a mass spectrometer (MS), X-ray Diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS) techniques. Furthermore, thermolysis of ammonium sulfate, (NH4)(2)SO4, in the presence of Mn3O4 was also investigated by conducting flow reactor experiments. The experimental results obtained indicate that at 200-450 degrees C, (NH4)(2)SO4 decomposes forming NH3 and H2O and sulfur trioxide that in the presence of manganese oxide react to form manganese sulfate, MnSO4. At still higher temperatures (800 similar to 900 degrees C), MnSO4 further decomposed forming SO2 and O-2. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights

    Journal Title

    International Journal of Hydrogen Energy

    Volume

    36

    Issue/Number

    10

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    5822

    Last Page

    5827

    WOS Identifier

    WOS:000290922600009

    ISSN

    0360-3199

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