Non-isothermal kinetics of CrO3 decomposition pathways in air

Abstract

The course of the non-lsothermal decomposition of CrO3 in air was explored kinetic, ally, by using a number of widely accepted methods. The credibility of the values obtained from a given kinetic parameter (the reaction order, the activation energy and the frequency factor) was justified on the grounds of (i) a multiple correlation coefficient, and (ii) the merits and demerits of the method adopted. The results obtained may help towards a characterization of the non-isothermal conditions under which the encountered decomposition events and products could be resolved. The study was motivated by the results of previous physicochcmical characterization studies [1, 2l, in which catalytically important intermediates CrOx(3<x<6) were structurally identified.

Phase-Dependent Formation of Coherent Interface Structure between PtO2 and TiO2 and Its Impact on Thermal Decomposition Behavior

“…In such a case, the activation energy ( E a ) of Pt-oxide dissociation was estimated from the O 2 -TPD peak temperatures recorded at different heating rates using a nonisothermal kinetic analysis method developed by Ozawa (see Supporting Information, Figure S4). , As-calculated E a for Pt/TiO 2 -R (260 kJ mol –1 ) was close to the value of bulk PtO 2 (243 kJ mol –1 ), although their peak temperatures were quite different (Pt/TiO 2 -R: >740 °C, bulk PtO 2 : >550 °C). These results demonstrate that the higher thermal stability of Pt oxides on rutile TiO 2 is caused by thermodynamic effect and rather than kinetic effect.…”

Characterization of Physical, Thermal and Structural Properties of Chromium (VI) Oxide Powder: Impact of Biofield Treatment

“…Thermo Gravimetric Analysis-Differential Thermal Analysis (TGA-DTA) [23]. Further, data suggest that T max was increased by 1.52, 2.12, 1.02, and 3.07% in T1, T2, T3 and T4, respectively as compared to control.…”

The Raman spectra of Cr3O8 and Cr2O5

“…2 The CrO 3 was placed in a glazed porcelain combustion boat and heated in a silica sleeve in a tube furnace with an oxygen flow-rate of ca 40 cm 3 min. 1 To prepare Cr 3 O 8 , the sample was heated over 2 h to 165°C, equilibrated at this temperature for several hours, heated at 12°C h 1 to 280°C, soaked at this temperature for 24 h, then cooled under oxygen by turning the furnace off. Cr 2 O 5 was prepared from the resulting Cr 3 O 8 product by heating a portion of it in a similar manner, but with a higher maximum soaking temperature of 340°C.…”