Effect of sintering and porosity changes on rates of gas—solid reactions

Unusual behavior of a pollution abatement system: SO2 capture by red ochre

“…These features suggest that the behavior of red ochre upon calcination is quite complex, making the study of this system interesting from a mechanistic point of view.The experimental observations stated above are somewhat peculiar for this kind of system, involving an increase in molar volume of the product ( Z , = 4.14). The theoretical maximum sulfation before pore plugging for pure Fe,O, pellet (0.44 porosity), as reported earlier (Ramachandran and Smith, 1977), is 32%. The presence of inerts improves the conversion of calcined red ochre to a value of 60% in 120 min a t 47OOC (Prasannan et al, 1985).…”

Unusual behavior of a pollution abatement system: SO2 capture by red ochre

“…These features suggest that the behavior of red ochre upon calcination is quite complex, making the study of this system interesting from a mechanistic point of view.The experimental observations stated above are somewhat peculiar for this kind of system, involving an increase in molar volume of the product ( Z , = 4.14). The theoretical maximum sulfation before pore plugging for pure Fe,O, pellet (0.44 porosity), as reported earlier (Ramachandran and Smith, 1977), is 32%. The presence of inerts improves the conversion of calcined red ochre to a value of 60% in 120 min a t 47OOC (Prasannan et al, 1985).…”

A gas‐solid reaction model — Variable temperature, pressure and structural parameters

“…Several adaptations to the grain model have been presented to deal with varying structural properties. Similar approaches are presented by Ramachandran and Smith (1977), Georgakis et al (1979), and Garza- Garza and Dudukovic (1981). The grain radii are considered to be function of time and position in the pellet and are determined from stoichiometry and density differences between solid reactant and product.…”

Development of pore network method in simulation of non-catalytic gas–solid reactions – Study of sulfur dioxide chemisorption on copper oxide sorbents

“…(e) The reaction performs under no sintering condition. It has been shown that under sintering conditions, other parameters must also be taken into consider which increase the complexity of the model [13]. This situation drastically changes the behavior of the reaction rate and the porosity variations.…”

Unusual behavior of a pollution abatement system: SO2 capture by red ochre

“…These features suggest that the behavior of red ochre upon calcination is quite complex, making the study of this system interesting from a mechanistic point of view.The experimental observations stated above are somewhat peculiar for this kind of system, involving an increase in molar volume of the product ( Z , = 4.14). The theoretical maximum sulfation before pore plugging for pure Fe,O, pellet (0.44 porosity), as reported earlier (Ramachandran and Smith, 1977), is 32%. The presence of inerts improves the conversion of calcined red ochre to a value of 60% in 120 min a t 47OOC (Prasannan et al, 1985).…”

A gas‐solid reaction model — Variable temperature, pressure and structural parameters

“…Several adaptations to the grain model have been presented to deal with varying structural properties. Similar approaches are presented by Ramachandran and Smith (1977), Georgakis et al (1979), and Garza- Garza and Dudukovic (1981). The grain radii are considered to be function of time and position in the pellet and are determined from stoichiometry and density differences between solid reactant and product.…”

Development of pore network method in simulation of non-catalytic gas–solid reactions – Study of sulfur dioxide chemisorption on copper oxide sorbents

“…(e) The reaction performs under no sintering condition. It has been shown that under sintering conditions, other parameters must also be taken into consider which increase the complexity of the model [13]. This situation drastically changes the behavior of the reaction rate and the porosity variations.…”

Unusual behavior of a pollution abatement system: SO2 capture by red ochre

“…These features suggest that the behavior of red ochre upon calcination is quite complex, making the study of this system interesting from a mechanistic point of view.The experimental observations stated above are somewhat peculiar for this kind of system, involving an increase in molar volume of the product ( Z , = 4.14). The theoretical maximum sulfation before pore plugging for pure Fe,O, pellet (0.44 porosity), as reported earlier (Ramachandran and Smith, 1977), is 32%. The presence of inerts improves the conversion of calcined red ochre to a value of 60% in 120 min a t 47OOC (Prasannan et al, 1985).…”

A gas‐solid reaction model — Variable temperature, pressure and structural parameters

“…Several adaptations to the grain model have been presented to deal with varying structural properties. Similar approaches are presented by Ramachandran and Smith (1977), Georgakis et al (1979), and Garza- Garza and Dudukovic (1981). The grain radii are considered to be function of time and position in the pellet and are determined from stoichiometry and density differences between solid reactant and product.…”

Development of pore network method in simulation of non-catalytic gas–solid reactions – Study of sulfur dioxide chemisorption on copper oxide sorbents

“…(e) The reaction performs under no sintering condition. It has been shown that under sintering conditions, other parameters must also be taken into consider which increase the complexity of the model [13]. This situation drastically changes the behavior of the reaction rate and the porosity variations.…”