α chain growth factor
αave average chain growth factor
β parameter for chain growth factor model
ɛ porosity
η effectiveness factor
ρs density of support skeleton (kg/m3)
ρp density of the catalyst pellet (kg/m3)
σij characteristic length, Å
\(\upsilon_{i}\) stoichiometric coefficient
Σv diffusion volume
\(\Phi\) Thiele modulus
\(\phi_{i}^{{}^{\prime}}\) dimensionless Thiele modulus
Ψi dimensionless concentration of component i