甲烷在Z110y型催化剂上转化反应的宏观动力学及有效因子

Kinetics of Z110y methane steam reforming catalyst and its effectiveness factor

在 3.1 2 MPa(绝压 )下 ,反应温度 550～ 750℃ ,H2 O/ΣC=2 .0～ 4 .0 (摩尔比 ) ,甲烷碳空速 30 0 0～ 1 0 0 0 0 h- 1范围内 ,采用内循环无梯度反应器研究了 Z1 1 0 y型催化剂上甲烷蒸汽转化反应的宏观动力学。以平行反应模型表示转化反应 ,用非线性参数估值法处理实验测得数据 ,得到 CO和 CO2 的生成速率方程为 :r CO=7.896× 1 0 7exp ( - 4 6896/RT) P0 .7CH4 P0 .5H2 O ( 1 -βCO)r CO2 =1 .937× 1 0 5exp ( - 362 81 /RT) P0 .7CH4 P0 .9H2 OP- 0 .35H2 ( 1 -βCO2 )建立了 Z1 1 0 y五筋车轮型催化剂数学模型 ,推导出了计算其有效因子的解析计算式 ,由此得到该催化剂的有效因子为 :0 .1 3～ 0 .2 1。

The global kinetics of methane steam reforming reaction over Z110y nickel catalyst were studied in an internal recycle gradientless reactor under 3.12MPa with following experimental condition:reaction temperature 550～750℃,steam-to-carbon molar ratio 2.0～4.0,space velocity of methane 3000～10000h -1 .The kinetics of methane steam reforming was expressed as parallel reaction model.Experimental data were handled with nonlinear parameter estimation method.The rate equations for carbon monoxide and carbon dioxide formation are as follows: r CO =7.896×10 7exp(-46896/RT)P 0.7 CH 4 P 0.5 H20 (1-β CO ) r CO 2 =1.937×10 5exp(-36281/RT)P 0.7 CH 4 P 0.9 H 2O P -0.35 H 2 (1-β CO 2 ) Mathematic model was established for five-rib wheel shape Z110y catalyst.and analytic equation for calculation of effectiveness factor worked out.The effectiveness factor obtained for the catalyst was 0.13～0.21.