Effect of the partial pressure of water vapour on the thermal decomposition of γ-FeOOH and on the dispersity of the solid decomposition products

In total, three novel organic derivatives of lanthanide borohydrides, n-But4NRE(BH4)4 (TBAREB), RE = Ho, Tm, Yb, have been prepared utilizing mechanochemical synthesis and purified via solvent extraction. Studies by single crystal and powder X-ray diffraction (SC-XRD and PXRD) revealed that they crystalize in two polymorphic forms, α- and β-TBAREB, adopting monoclinic (P21/c) and orthorhombic (Pnna) unit cells, previously found in TBAYB and TBAScB, respectively. Thermal decomposition of these compounds has been investigated using thermogravimetric analysis and differential scanning calorimetry (TGA/DSC) measurements, along with the analysis of the gaseous products with mass spectrometry (MS) and with analysis of the solid decomposition products with PXRD. TBAHoB and TBAYbB melt around 75 °C, which renders them new ionic liquids with relatively low melting points among borohydrides.

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Effect of the partial pressures of oxygen and water vapour on the dispersity of α-Cr2O3 obtained by thermal decomposition of hydrated chromium(III) oxide

Canadian Journal of Chemistry ◽

10.1139/v83-081 ◽

1983 ◽

Vol 61 (3) ◽

pp. 457-460 ◽

Cited By ~ 6

Author(s):

Dimitar G. Klissurski ◽

Vladimir N. Bluskov

Keyword(s):

Thermal Decomposition ◽

Oxygen Partial Pressure ◽

Partial Pressure ◽

Specific Surface ◽

Water Vapour ◽

Sharp Increase ◽

Decomposition Product ◽

Argon Atmosphere ◽

Partial Pressures ◽

Highly Dispersed

The effect of water vapour and oxygen partial pressure on the thermal decomposition of hydrated chromium (III) oxide has been studied. A decrease in the water vapour partial pressure from 20 to 1 × 10−3 mm Hg has been found to produce a sharp increase in the specific surface area of the decomposition product (α-Cr2O3). Decomposition in an argon atmosphere leads to highly dispersed α-Cr2O3 even at relatively high temperatures (400–500 °C).

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267. Biological Monitoring of Thermal Decomposition Products of a 4,4-Methylene Diphenyl Diisocyanate (MDI) and Toluenediisocyanate (TDI)Polyurethane (PUR)

10.3320/1.2764936 ◽

1999 ◽

Author(s):

G. Skarping ◽

M. Dalene ◽

P. Lind

Keyword(s):

Thermal Decomposition ◽

Biological Monitoring ◽

Decomposition Products ◽

Methylene Diphenyl Diisocyanate ◽

Thermal Decomposition Products

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Analogues of the active and inactive sodium carbonate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19823348 ◽

1982 ◽

Vol 47 (12) ◽

pp. 3348-3361 ◽

Cited By ~ 4

Author(s):

Erich Lippert ◽

Karel Mocek ◽

Emerich Erdös

Keyword(s):

Thermal Decomposition ◽

Time Dependence ◽

Water Vapour ◽

Sulphur Dioxide ◽

Atmospheric Pressure ◽

Flow Reactor ◽

Kinetic Measurements ◽

Sodium Potassium ◽

Alkaline Metals ◽

Hydrogen Carbonates

The reactivity of the anhydrous carbonates of alkaline metals with sulphur dioxide has been studied experimentally in dependence both on the nature of the cation and on the way of preparation of the anhydrous carbonate. The carbonates were prepared either by thermal decomposition of hydrogen carbonates or by thermal dehydration of carbonate hydrates. The carbonates of lithium, sodium, potassium, rubidium and caesium have been investigated. Kinetic measurements were carried out in a flow reactor in the integral regime at 423 K under atmospheric pressure, with a gas containing 0.2 vol.% of sulphur dioxide and 2.0 vol.% of water vapour in the nitrogen as a carrier gas. The reactivities have been compared on the basis of time dependence of the conversion of carbonate to sulphite.

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Theoretical study on the formation of carbon disulfide and ammonia from thermal decomposition products of thiourea

Journal of Theoretical and Computational Chemistry ◽

10.1142/s0219633614500229 ◽

2014 ◽

Vol 13 (04) ◽

pp. 1450022 ◽

Cited By ~ 1

Author(s):

Zerong Daniel Wang ◽

Meagan Hysmith ◽

Perla Cristina Quintana

Keyword(s):

Thermal Decomposition ◽

Carbon Disulfide ◽

Density Functional ◽

Basis Sets ◽

Structural Isomer ◽

Consecutive Reaction ◽

Functional Theory ◽

Decomposition Products ◽

Thermal Decomposition Products ◽

Hybrid Module

The formation of carbon disulfide ( CS 2) and ammonia ( NH 3) from the thermal decomposition products of thiourea has been studied with MP2, and hybrid module-based density functional theory methods (B3LYP, MPW1PW91 and PBE1PBE), each in conjunction with five different basis sets (6-31+G(2d,2p), 6-311++G(2d,2p), DGDZVP, DGDZVP2 and DGTZVP). The free energy changes and activation energies for all the five primitive reactions involved in the formation of CS 2 and NH 3 have been compared and discussed. The results indicate that CS 2 is most likely formed in a consecutive reaction path that consists of the addition of hydrogen sulfide ( H 2 S ) to isothiocyanic acid (HNCS) to generate carbamodithioic acid and subsequent decomposition of carbamodithioic acid. By contrast, thiocyanic acid (HSCN) as the structural isomer of isothiocyanic acid is not likely the source of CS 2.

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