摘要
对于合成气一步法制二甲醚双功能催化剂,选取CO和CO2加氢反应及甲醇脱水反应为关键反应,建立了以CO、CO2及二甲醚为关键组分的扩散-反应模型。在反应温度220-260℃、压力5 MPa、空速1 000-2 500 h^-1的条件下,在内循环无梯度反应器中测定了合成气制二甲醚的宏观反应速率,并得到了关键组分内扩散效率因子。3种关键组分的内扩散效率因子均在0.11-0.64之间,说明内扩散对反应结果影响严重。使用正交配置法求解扩散-反应模型,计算得到的催化剂内扩散效率因子与实验值的相对误差绝对值的平均值在10%以内,说明该模型是适用的。讨论了催化剂内部关键组分的摩尔分数分布情况及温度对内扩散效率因子的影响。
The diffusion-reaction models for the bi-functional catalyst for one-step dimethyl ether（DME） synthesis from syngas were established by using CO,CO2 and DME as key components and choosing the hydration of CO and CO2 and dehydration of methanol as key reactions.The macro-reaction rates and internal diffusion efficiency factors of key compounds were measured in an internal recycle gradientless reactor with the reaction temperature of 220-260 ℃,pressure of 5 MPa,and space velocity of 1 000-2 500 h^-1.The internal diffusion efficiency factors of three key components were approximately between 0.11 and 0.64,which means that the internal diffusion affect the reactions seriously.The average of absolute value of relative deviations between calculated results by solving the diffusion-reaction model with orthogonal configuration method and the experimental data is within 10%,which means the models were acceptable.The effect of concentration profile of key components in catalysts and temperature on internal diffusion efficiency factors were also discussed.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第6期743-748,共6页
Journal of East China University of Science and Technology
基金
国家科技支撑计划(2006BAE02B02)
关键词
内扩散
效率因子
双功能催化剂
二甲醚
一步法
internal diffusion
efficiency factor
bi-functional catalyst
dimethyl ether
one-step
