Individual effects of atmospheric water vapor and carbon dioxide on the kinetics of the thermal decomposition of granular malachite

Abstract

This study examined the effects of atmospheric water vapor and CO2 on the thermal decomposition of granular malachite as a model process for the thermal decomposition of large and compact...

Acceleration Effect of Atmospheric Water Vapor on the Thermal Decomposition of Calcium Carbonate: A Comparison of Various Resources and Kinetic Parameterizations

“…Introduction of an AF (h(p(H 2 O)) is the simplest procedure for describing the kinetics as functions of temperature, conversion, and p(H 2 O). 60,63,75,79…”

“…In both possible mechanisms of the acceleration action of water molecules through their contributions to the elementary steps of the SR and the enhancement of CaO particle growth in the product layer, the number of water molecules adsorbed on the surfaces of reactant solids or product layer should be considered, and this is empirically expressed by the ath powdered form of atmospheric p(H 2 O). 60,63,75,79…”

“…The value decreased from 0.20 to 0.15 in the early stage of the reaction (α ≤ 0.20) and subsequently maintained an approximately constant value in the established Based on eq 6, the direct correlation of the rate behavior under different p(H 2 O) values to Af(α) is expressed by eq 9. 60,63,75,79 ( ) ( )…”

“…56−61 The acceleration effect of water vapor has also been found for the thermal decomposition of the other inorganic carbonates, and the extended Friedman plot and master plot methods used in this study have been applied to some of these reactions. 60,63,75,79 The reported kinetic parameters for these reactions under different temperatures and p(H 2 O) values are listed in Table S1. In all studied processes, the kinetics of the thermal decomposition under different p(H 2 O) values have been described by each set of kinetic triplets, where the empirical S ̌estaḱ−Berggren model (SB(m, n, p): 108 has been used as f(α).…”

Physico-geometrical kinetics of the thermal dehydration of sodium carbonate monohydrate as a compacted composite of inorganic hydrate comprising crystalline particles and matrix

“…Thus, the apparent kinetic behavior varies with the thickness of the sample bed and sample mass, [20][21][22] which also regulates the reaction geometry of the sample particle assemblage and varies the reaction pathways of some reactions, producing a thermodynamically stable intermediate compound under a self-generated condition, as observed for the thermal dehydration of calcium sulfate dihydrate. [23][24][25] Furthermore, a compacted agglomerate of reactant particles is one possible form of a solid reactant in the thermal decomposition, as typically seen for granulated malachite (Cu 2 CO 3 (OH) 2 ) 26,27 and sodium percarbonate (Na 2 CO 3 Á(3/2)H 2 O 2 ), 28,29 for which the functionality is further increased by granulation. A detailed kinetic understanding of the thermal decomposition of granular malachite and sodium percarbonate is necessary for producing a granular CuO catalyst for different reactions and evaluating its thermal stability as a safety assessment due to its oxidizing property, respectively.…”