强制性CO2浓度周期操作对低碳混合醇合成反应的影响

The influence of forced CO2 concentration cycling on catalytic synthesis of higher alcohols

研究了强制性CO_2浓度周期操作对低碳醇合成反应速率的影响。在2MPa,320℃下,恒定反应气流量,在矩形脉冲条件下控制CO_2浓度进行实验。结果表明,只要条件选择合适,可以改善低碳醇合成产物的分布。在最佳操作条件下C_2^+OH时均生成速率比相应稳态值高20%,总醇生成速率也略有提高.实验中还发现强制CO_2浓度周期操作条件下催化剂表面对H_2、CO的贮存效应,其结果导致了C_2^+OH在周期操作过程中某一局部的反应速率发生骤变。此外,还研究了阶跃扰动对甲醇及C_2^+OH生成的影响。

An investigation has been made on the influence of forced CO_2 concentration cycling on the formation rate of higher alcohols. The experiments were carried out under the conditions of 2 MPa,320℃ constant reaction gas flow rates and CO_2 concentration indicated as rectangular pulses. The results show that the product distribution of higher alcohols synthesis can be improved if proper conditions are adopted. Under the opti- mum conditions,the time-average formation rate of C_2^+OH can be 20% higher than the corresponding steady- state value, and the formation rate of total alcohols is also slightly increased. In addition,storage of H_2 and CO on the catalyst surface was found in the experiments under the conditions of forced CO_2 concentration cycling, resulting in abrupt variation of partial formation rate of C_2^+OH during the cycling. Moreover, the influence of step-change on the formation of higher alcohols and C_2^+OH was also investigated.