THE OXIDATION OF CARBON MONOXIDE BY SOLID PERMANGANATE REAGENTS: VII. THERMAL DECOMPOSITION OF SILVER PERMANGANATE

1954 ◽  
Vol 32 (12) ◽  
pp. 1068-1077 ◽  
Author(s):  
G. A. Grant ◽  
Morris Katz
Keyword(s):  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Chemical Analysis ◽  
Manganese Dioxide ◽  
Silver Oxide ◽  
Decomposition Products ◽  
Mechanism Of Decomposition ◽  
Oxidation Of Carbon Monoxide

The thermal decomposition in a vacuum at 100 °C of both whole and ground crystals of pure dry silver permanganate was followed by the measurements of increase in pressure and of loss in weight. The decomposition products were determined by analysis and calculations to be silver oxide, silver, manganese dioxide, silver permanganite, and oxygen. On the basis of chemical analysis the following mechanism of decomposition is proposed:(1)[Formula: see text](2)[Formula: see text](3)[Formula: see text]The reaction proposed in equation (1) goes to completion, while the reaction proposed in equation (2) goes to approximately 37.7% completion, and that in equation (3) goes to approximately 6.6% completion.

Theoretical Study of the Kinetics and Mechanism of the Thermal Decomposition of 3-Oxetanone in the Gas Phase

2017 ◽  
Vol 42 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Mohammad Khavani ◽  
Javad Karimi
Keyword(s):  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Ethylene Oxide ◽  
Gas Phase ◽  
Transition States ◽  
Decomposition Reaction ◽  
Kinetics And Mechanism ◽  
Methyl Radical ◽  
Decomposition Products ◽  
Concerted Mechanism

The kinetics and mechanism of the thermal decomposition reaction of 3-oxetanone in the gas phase were studied using quantum chemical calculations. The major products of this reaction are formaldehyde, ketene, carbon monoxide, ethylene oxide, ethylene and methyl radical. Formaldehyde, ketene, carbon monoxide and ethylene oxide are the initial decomposition products and other species are the products of ethylene oxide decomposition. The results of B3LYP and QCISD(T) calculations reveal that thermal decomposition of 3-oxetanone to ethylene oxide and carbon monoxide is more probable than to formaldehyde and ketene from an energy viewpoint. Moreover, quantum theory of atoms in molecules and natural bond orbital analysis indicate that 3-oxetanone decomposition to formaldehyde, ketene, carbon monoxide and ethylene occurs via a concerted mechanism and bonds that are involved in the transition states have a covalent character. Moreover, the calculated changes in bond lengths in the transition states reveal that bond breaking and new bond formation occur asynchronously in a concerted mechanism.

Thermal Decomposition Products of Fiberglass Composites: A Fourier Transform Infrared Analysis

1997 ◽  
Vol 15 (2) ◽  
pp. 108-125 ◽  
Author(s):  
Karen Kinsella ◽  
James R. Markham ◽  
Chad M. Nelson ◽  
Thomas R. Burkholder
Keyword(s):  
Nitric Oxide ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Fire Safety ◽  
Fourier Transform Infrared ◽  
Decomposition Products ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Decomposition products of fiberglass composites used in construc tion were identified using Fourier transform infrared (FT-IR) spectroscopy. This bench-scale study concentrated on identification and quantification of toxic species. Identifying compounds evolved during thermal decomposition provides data to develop early fire detection systems as well as evaluate product fire safety performance. Material fire behavior depends on many factors. Ventila tion, radiant heat flux, and chemical composition are three factors that can be modeled. Physical observations of composites during thermal decomposition with simultaneous identification and quantification of evolved gases offer re searchers in both material development and fire safety an advancement in the state-of-the-art for material testing. Gas analysis by FT-IR spectroscopy iden tified toxic effluent species over a wide range of composite exposure tempera tures (100 to 1000 ° C), during pyrolysis and combustion. Fiberglass composites with melamine, epoxy, and silicone resins were profiled. Formaldehyde, meth anol, carbon monoxide, nitric oxide, methane, and benzene were identified by the spectral analysis prior to physical evidence of decomposition. Toxic concen trations of formaldehyde, carbon monoxide, nitric oxide, ammonia, and hydro gen cyanide were observed as thermal decomposition progressed.

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