Mechanochemical Effects of Grinding of Both Ammonium Paramolybdate Tetrahydrate and Its Thermally Decomposed Products

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  • MANABE Kazuo
    Department of Industrial Chemistry, Faculty of Engineering, Tokyo College of Photography
  • OGAWA Makoto
    Department of Industrial Chemistry, Faculty of Engineering, Tokyo College of Photography
  • YONEMURA Yasunobu
    Department of Chemistry, Faculty of Science, Tokai University
  • KUBO Teruichiro
    Musashi Institute of Technology

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Other Title
  • 摩砕によるパラモリブデン酸アンモニウム四水和物とその熱分解生成物のメカノケミカル変化

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It has been reported that the thermal decomposition of ammonium paramolybdate tetrahydrate in an air proceeds as follows:<BR>3 (NH4)20.7 Mo08.4 H20 (APM) 2 (NH4)20.5 MoO3 (M1)<BR>2 (NH4) O.8 MoO3 (M2) Mo03.<BR>This paper deals with the effect of mechanical grinding on the processes of thermal decomposition of APM, M1, and M2. The methods of TG, DTA, X-ray diffraction, mass spectroscopy and chemical analysis were used in this study.<BR>Two kinds of new intermediates (named A and B) were consecutively formed by mechanical grinding of APM and M1, and a new intermediate (named C) was produced by grinding of M2. Both two intermediates A and B decompose into MoO, through the intermediate compound M, in the course of thermal decomposition, but amorphous sample, obtained by grinding of M, more than a week, decomposes directly into MoO8 without passing M, in the course of thermal decomposition. The intermediate C decomposes through a new intermediate (named D) into MoO8.<BR>Three kinds of intermediates, A, B and C become amorphous upon grinding for a long time, but a crystal structure of intermediate D scarcely changes upon grinding for a week.<BR>It was supposed that three new compounds, A, B and C would have the same composition as m (NH, ), O. n MoO3, and that an intermediate D would have the same crystal form as hexagonal MoOs, and would occlude both water and ammonia in interstitial positions of their crystal lattices.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1977 (7), 947-952, 1977-07-10

    The Chemical Society of Japan

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