Published January 2003
| Version v1
Journal article
Thermal transformations of heteropoly acid α-H6P2Mo18O62 · nH2O
- 1. SO RAN, Inst. Kataliza im. G.K. Boreskova, Novosibirsk (Russian Federation)
Description
Thermal transformations of heteropoly acid α-H6P2Mo18O62 · nH2O (HPA α-P2Mo18) during heating up to 500 Deg C were studied by the methods of 31P NMR, IR spectroscopy and differential thermal analysis. It was ascertained that at a temperature above 80 Deg C α-P2Mo18 partially transforms into γ-isomer and β-isomer, which have been revealed for the first time. Their reverse transformation is observed in the process of rehydration in the air in a week, and in aqueous solution - in approximately 1 h. When heated up to 350 Deg C HPA P2 Mo18 decomposes into HPA H3PMo12O40 and previously unknown HPA HPMo6O21. Molybdenyl phosphates and molybdenum trioxide are the pyrolysis final products
Abstract (Russian)
Методами ЯМР 31Р, ИК-спектроскопии и дифференциального термического анализа изучены термические превращения гетерополикислоты α-H6P2Mo18O62 · nH2O (ГПК α-P2Mo18) при нагревании до 500 град С. Установлено, что при температуре выше 80 град С α-P2Mo18 превращается частично в γ-изомер и β-изомер, которые обнаружены впервые. Их обратное превращение наблюдается при регидратации на воздухе за неделю, а в водном растворе - за 1 ч. При нагревании до 350 град С ГПК P2 Mo18 разлагается на ГПК H3PMo12O40 и ранее неизвестную ГПК HPMo6O21. Конечными продуктами пиролиза являются фосфаты молибденила и триоксид молибденаAdditional details
Additional titles
- Original title (Russian)
- Термические превращения гетерополикислоты α-Х
Publishing Information
- Journal Title
- Izvestiya Akademii Nauk. Rossijskaya Akademiya Nauk. Seriya Khimicheskaya
- Journal Issue
- no.1
- Journal Page Range
- p. 97-102
- ISSN
- 1026-3500
- CODEN
- IASKEA
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 35060020
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- CHEMICAL COMPOSITION; INFRARED SPECTRA; ISOMERIZATION; MOLYBDOPHOSPHORIC ACID; NMR SPECTRA; PHASE STUDIES; PHOSPHORUS 31; PYROLYSIS; PYROLYSIS PRODUCTS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; THERMAL ANALYSIS
- Descriptors DEC
- CHEMICAL REACTIONS; DECOMPOSITION; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; ISOTOPES; LIGHT NUCLEI; MOLYBDENUM COMPOUNDS; NUCLEI; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; PHOSPHORUS COMPOUNDS; PHOSPHORUS ISOTOPES; REFRACTORY METAL COMPOUNDS; SPECTRA; STABLE ISOTOPES; TEMPERATURE RANGE; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- 19 refs., 4 figs., 1 tab.