摘要
研究了苯气相氧化为顺酐用的 V-Mo-P-Ni-α-Al_2O_3系催化剂,筛选出顺酐收率最大时的最佳配方,并用等离子射流法将氧化铝载体喷涂在反应器壁上,然后喷涂活性组分及助剂,获得了良好效果。苯氧化反应的化学计量关系不仅取决于系统中所含的物种数目及类别,且与所使用的催化剂有关。在所研制的催化剂上进行了苯氧化反应实验,操作条件范围如下:689～724K;原料气空速0.092～0.22mol/(h·g);苯浓度0.5～1.98%。根据实验结果提出了相应的化学计量式,筛选出最佳反应动力学模型。
With α-Al_2O_3 as the support,V-Mo-P-Ni catalyst has been used in the investigation of vapor phase oxidation of benzene to maleic anhydride.The yield of maleic anhydride is maximum when the molar ratio of vanadium pentaoxide to molybdenum trioxide and to phosphorous pentaoxide is equal to 1:0.5:0.2,whereas the nickel content has nearly no effect on the catalytic activity.α- Al_2O_3 was coated on the reactor wall by means of a plasma torch and then the pasty mixture of vanadium molybdenum,phosphorous and nickel compounds was coated on.This method is proved to be feasible. Stoichiometry of benzene oxidation reaction depends not only upon the number and the kinds of the chemical species involved in the reaction system,but also on the catalyst used.Our experimental results showed that the stoichiometric equations may be represented as follows: C_6H_6+4O_2→C_4H_2O_3+CO+CO_2+2H_2O C_4H_2O_3+2O_2→2CO+2CO_2+H_2O C_6H_6+6O_2→3CO+3CO_2+3H_2O Each reaction can be considered as a pseudo-first order reaction.The computed values using the kinetic model suggested agree well with those of the experiments.Their average absolute deviations are 2.21% and 1.98% for benzene conversion and yield of maleic anhydride respectively.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1991年第2期111-119,共9页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金
关键词
苯
催化
氧化
顺酐
管壁式
反应器
catalytic oxidation
tubular-wall reactor
maleic anhydried
