甲烷常压O_2部分氧化合成甲醛反应动力学

A KINETIC STUDY OF PARTIAL OXIDATION OF METHANE TO FORMALDEHYDE WITH ATMOSPHERIC O 2

用Ｍｏ／ＳｉＯ２催化剂在常压流动体系固定床反应器中进行了甲烷部分氧化合成甲醛反应的本征动力学研究，确定了反应途径和反应级数，通过Ｌａｐｌａｃｅ变换计算了各步反应速度常数和活化能，给出了Ｏ２浓度和反应温度对产物分布和最佳空时的影响规律，并预测了不同反应温度下的最佳空时及空时收率（ＳＴＹ）。

The kinetic study has been carried out in a flowing reactor with O 2 on Mo (8 4%w)/SiO 2 catalysts under the conditions of 773￣923K, CH 4/O 2=7￣10, 0 1MPa The experiments indicate that the reaction procedure is CH 41CH 2O2CO3CO 2 and the reaction orders are one to the first two steps and less than one to the third for O 2, and that overall orders are zero for CH 4 Through laplace transformation the rate constants in a linear differential equation group set up from the material balance have been estimated By linear regression the activation energies have been calculated, which are 192 kJ/mol, 203 kJ/mol and 314 kJ/mol, respectively The relationships of y i￣τ and τ opt ￣y 50 (T) have been given Fexamination is notable The errors for y i and S i between experimental data and model are all less than 0 1 The optimum space time and yield of CH 2O at different temperature are predicted The best STY is 9 48 mol/g·min and the τ opt is 0 043s at 873K and y 50 =0 1