Hydration enthalpy for synthetic and cation exchanged A-type zeolites with special reference to zeolite heat pump media

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Author(s)

    • KASAI Toshihiro
    • Department of Advanced Materials Science and Engineering, Graduate School of Engineering, Yamaguchi University
    • MAEDA Hiroshi
    • Department of Advanced Materials Science and Engineering, Graduate School of Engineering, Yamaguchi University
    • MATSUI Kousuke
    • Department of Advanced Materials Science and Engineering, Graduate School of Engineering, Yamaguchi University
    • KURNIA Dewi Fatimah
    • Research and Development Centre for Geotechnology Indonesian Institute of Sciences (LIPI)
    • NAKAYAMA Noriaki
    • Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University
    • MIZOTA Tadato
    • Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University

Abstract

Na-A type zeolite has been synthesized from the waste solution with the red mud exhausted from the Bayer process. The heats of water-vapor absorption of the Na–A and cation exchanged zeolites were measured by means of an adiabatic water-vapor absorption calorimeter which had been devised for investigating heat pump effect of zeolites. The integrated hydration enthalpy of A-zeolite is in the same order as those of mordenite and clinoptilolite. However, A-zeolite shows twice the total heat amount obtainable from unit weight samples of a natural zeolite, because natural zeolites contain impurity phases, and their dehydration amount around 100°C is much smaller. Mg-exchanged A-zeolite dehydrated at 100°C showed the largest amount of hydration enthalpy of 65.1kJ/mol, and a weight loss on dehydration of 14.7%. The Mg-A-zeolite will be the most efficient heat pump media of all zeolites dehydrated at 100°C in the present work.

Journal

  • Mineralogical Journal

    Mineralogical Journal 17(4), 170-180, 1994-10-01

    Japan Association of Mineralogical Sciences

References:  10

Cited by:  13

Codes

  • NII Article ID (NAID)
    10008771077
  • NII NACSIS-CAT ID (NCID)
    AA00739590
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    05442540
  • Data Source
    CJP  CJPref  J-STAGE 
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