Constant Thickness Porous
Layer Model for Reaction
between Gas and Dense Carbonaceous Materials
Eric A. Morris
Rex Choi
Ti Ouyang
Charles Q. Jia
10.1021/ie3019643.s001
https://acs.figshare.com/articles/journal_contribution/Constant_Thickness_Porous_Layer_Model_for_Reaction_between_Gas_and_Dense_Carbonaceous_Materials/2471236
Using oil-sands petroleum coke as the raw material and
sulfur dioxide
as the activating agent at 700 °C, the process of pore development
in dense carbonaceous materials was studied. The time dependence of
porosity was established from measured values of specific surface
area (SSA), which could not be explained using conventional porous
layer theories. Incorporating the Random Pore Model with measurements
of particle size and porous layer thickness, a model was developed
based on the existence of a porous layer of constant thickness. The
model was found to accurately reproduce experimental time dependence
of SSA. The results confirm a constant thickness of the porous layer
for the activation conditions studied, which results from competing
effects of carbon gasification reaction and penetration of the activating
agent into the carbon particle interior. The model predicts a higher
achievable SSA for a greater constant porous layer thickness, smaller
initial particle size, and lower inorganic ash content. This model
was found to be useful in predicting the maximum porous layer thickness
of a dense material undergoing activation or gasification using only
measured values of SSA, pore size distribution, and particle size
as inputs.
2012-11-07 00:00:00
layer thickness
time dependence
Constant Thickness Porous Layer Model
material
pore size distribution
particle size
model
carbon gasification reaction
Random Pore Model
SSA