【摘要】 本文利用单粒子扩散反应器对甲烷在4A沸石中的扩散系数进行了测量。首先由沸石的吸附柱的一级矩得到吸附平衡常数Ka,即: △μ=μ₁^c-μ₁ⁱⁿ=x/u·（1-a）/aρ_pK_a然后由单粒子扩散反应器的一级矩得到甲烷在4A沸石中的大孔扩散系数,即: μ₁^’=L²/（6D_a）[（ε_a+ε_i）+（1-ε_a）ρK_a利用以上结果及单粒子扩散反应器的二级矩则可得到甲烷在4A沸石中的微孔扩散系数,即: μ’₂=（L⁴）[（ε_a+ε_i）+（1-ε_a）ρK_a]²)/(90D²_a+（L²（ε_i+ρK_a）²·γ₀²）/（45D_a·D_i（1-ε_a））得到的实验条件下的微孔扩散系数在3.34×10^-11-3.90×10^-11cm²/s范围内,扩散活化能为2.1kJ/mol。更多还原

【Abstract】 Intracrystalline diffusivities （D_i） of methane in 4A zeolite were measured in a single pellet diffusion reactor,and the D_i is got from the second moment of the reactor:μ’₂=（L⁴[（ε_a+ε_i）+（1-ε_a）pK_a]²）/（90D_a²）+（L²（ε_i+pK_a）²r₀²）/(45D_aD_i（1-ε_a） where the adsorption equilibrium constant K_a is obtained from the first moment of the adsorption column of 4A zeolite: △μ=μ₁^c-μ₁ⁱⁿ=x/u （1-α）/αρK_a and the intercrystalline diffusivity D_a is gained from the first moment of the single pellet diffusion reactor: μ’₁=（L²）/（6D_a）[（ε_a+ε_i）+（1-ε_a）ρK_a] Under the experimental conditions the intracrystalline diffusivities are in the range of 3.34×10^-11-3.90×10^-11cm²/s and the activation energy for diffusion is 2.1kJ/mol.更多还原