CO_(2)催化合成衍生柴油的基础研究

FUNDAMENTAL RESEARCH ON CO_(2) CATALYTIC SYNTHESIS OF DERIVATIVE DIESEL

为促进我国“双碳”政策的推行,拓展CO_(2)的循环利用技术,开展了CO_(2)合成柴油的实验探索,利用铁基催化剂,以CO_(2)作为原料,探讨了CO_(2)加氢合成衍生柴油的可行性研究。在科学验证CO_(2)合成衍生柴油可行性的基础上,进一步考察了催化剂载体的酸碱性、催化剂组元Fe含量以及助剂添加对催化活性的影响。研究表明:CO_(2)加氢的合成产物的主要组分及组分分布特点与商用柴油高度一致。以γ-Al_(2)O_(3)为载体负载铁基催化剂可有效促进CO_(2)的逆水煤气反应和芬顿反应;作为催化剂助剂,金属元素K的添加对提高催化活性有较好的辅助作用。反应温度和压力是该反应的可控因子,其中,压力为决定因素,当压力>1.6 MPa时,反应才可以在250℃以上的温度域顺利发生。此外,载体的酸碱性、催化组元Fe及助剂K含量对合成产物的组分分布情况及与柴油的相似度也具有重要影响。

To promote the implementation of China’s Dual Carbon Goals policy and expand the recycling technology of CO_(2),the experimental exploration of CO_(2)synthesis of diesel was carried out in this paper.Using iron-based catalyst and CO_(2)as the raw material,the feasibility study of CO_(2)hydrogenation synthesis of diesel was discussed.Based on verifying the feasibility of CO_(2)synthesis to derive diesel,we further investigated the effect of catalyst carrier’s acidity and alkalinity,catalyst component Fe content and additive addition on catalytic activity.The research showed that the main components and component distribution characteristics of the synthesis products of CO_(2)hydrogenation were highly consistent with those of commercial diesel.The iron-based catalyst supported byγ-Al_(2)O_(3)could effectively promote the reverse water gas reaction of CO_(2)and the Fenton reaction.As a catalyst promoter,the addition of potassium had a good auxiliary effect on improving the catalytic activity.The reaction temperature and pressure were the controllable factors of the reaction,and the pressure was the decisive factor.The study found that only when the pressure was higher than 1.6 MPa,the reaction smoothly occured in the temperature range above 250℃.In addition,the acidity and alkalinity of the carrier,the content of the catalytic component Fe and the auxiliary K had a crucial influence on the composition characteristics of the synthesized products and similarity with diesel.