ChemInform Abstract: Condensed Phosphates of Bivalent Metals

ChemInform ◽  
1988 ◽  
Vol 19 (6) ◽  
Author(s):  
M. TROJAN ◽  
D. BRANDOVA
Keyword(s):  
Condensed Phosphates ◽  
Bivalent Metals

Hydrolysis of Condensed Phosphates in Soils

1965 ◽  
Vol 29 (4) ◽  
pp. 487-488
Author(s):  
R. R. Allmaras ◽  
C. A. Black
Keyword(s):  
Condensed Phosphates ◽  
Hydrolysis Of

A Contribution to the Structure Characteristics and Phase Composition of Vanadium-Phosphorus Catalysts Prepared from the VOPO4.xH2O.yH3PO4 Precursor

1992 ◽  
Vol 57 (12) ◽  
pp. 2475-2480 ◽  
Author(s):  
Milan Brutovský ◽  
Štefan Gerej ◽  
Ján Novák ◽  
Lucia Ferdinandyová
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Ir Spectra ◽  
Metal Cations ◽  
Preparation Procedure ◽  
Final Temperature ◽  
Structure Characteristics ◽  
Heat Treatment Regime ◽  
Condensed Phosphates ◽  
Defective Crystals

Catalysts were prepared from VOPO4.xH2O.yH3PO4 (x = 0.3-2, y = 0.2-0.85) by reduction with SO2 up to a final temperature of 750-800 °C, and activated in a reaction mixture of 1.0-1.4% butane in air up to 500 °C. The structure characteristics and phase composition of the catalysts were found to be affected by the preparation procedure and heat treatment regime. Their diffraction lines and IR spectra revealed that the catalysts from larger and less defective crystals than catalysts which were obtained from the VOHPO4.xH2O.yH3PO4 precursor and activated in the reaction mixture at temperatures up to 500 °C. In the catalysts prepared by the above procedure, the tendency to the formation of phases of higher-condensed phosphates, in particular VO(PO3)2 or even V(PO3)3, increases with increasing n(P):n(V) ratio and is then more pronounced than with vanadium-phosphorus catalysts prepared by other procedures. The tendency to the formation of the catalytically less active condensed phosphates is partly suppressed by the embedding of modifying metal cations (Fe or Cu in this case).

The synthesis and properties of oxofluoroniobates and fluorotantalates of bivalent metals

1972 ◽  
Vol 27 (1) ◽  
pp. 35-43 ◽  
Author(s):  
R.L. Davidovich ◽  
T.F. Levchishina ◽  
T.A. Kaidalova ◽  
V.I. Sergienko
Keyword(s):  
Bivalent Metals

Enzymatic degradation and assimilation of condensed phosphates by green algae

1967 ◽  
Vol 1 (5) ◽  
pp. 335-350 ◽  
Author(s):  
Ernst M. Davis ◽  
Maxwell J. Wilcomb
Keyword(s):  
Green Algae ◽  
Enzymatic Degradation ◽  
Condensed Phosphates

scholarly journals CHEMICAL PREPARATION AND CRYSTAL DATA FOR TWO CONDENSED PHOSPHATES NiCs4(PO3)6 AND NiK4(P3O9)2

2003 ◽  
Vol 16 (0) ◽  
pp. 107-111 ◽  
Author(s):  
KACEM SBAI ◽  
AZEDDINE ATIBI ◽  
ABDELKEBIR KENZ ◽  
ELMOSTAFA TACE ◽  
MALIKA TRIDANE
Keyword(s):  
Crystal Data ◽  
Chemical Preparation ◽  
Condensed Phosphates

scholarly journals Thermal properties of metal-metal bonded Pd(I) complexes supported onto porous Vycor glass

2008 ◽  
Vol 80 (2) ◽  
pp. 263-269
Author(s):  
Iara F. Gimenez ◽  
Oswaldo L. Alves
Keyword(s):  
Solid State ◽  
Thermal Stabilization ◽  
Decomposition Products ◽  
Vycor Glass ◽  
X Ray ◽  
Porous Vycor Glass ◽  
Metal Metal ◽  
Condensed Phosphates ◽  
Diffuse Reflectance Infrared ◽  
Immobilized Complexes

Thermal behavior of the complexes Pd2(dppm)2Cl2, Pd2(dppm)2(SnCl3)Cl and Pd2(dppm)2(SnCl3)2 (dppm = bis[diphenylphosphino(methane)], ((C6H5)2PCH2P(C6H5)2) in the solid state and immobilized onto porous Vycor glass was studied. Similar decomposition mechanisms were observed for the solid and immobilized complexes, with a small thermal stabilization upon immobilization. The decomposition products were characterized by X-ray diffractometry, Raman and diffuse reflectance infrared spectroscopy, which indicated the presence of a mixture of metallic palladium and oxidized species such as PdO,condensed phosphates, SnO2 and SnP2O7. According to X-ray diffractometry, the decomposition products of the immobilized complexes presented higher amounts of PdO than the solid-state residues, probably as an effect of interactions with silanol groups present in the glass surface.

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