基于NPSC的Zn/HZSM-5在线催化提质生物油的研究

Study on Online Catalytic Upgrading of Bio-Oil Using NPSC Based Zn/HZSM-5

建立了低温等离子体协同催化体系,并在该体系下利用Zn/HZSM-5进行了在线催化提质生物油的研究,分析了三效(低温等离子体、HZSM-5本身和Zn改性成分)催化对生物油品质和Zn/HZSM-5结焦的影响规律。结果表明,精制生物油产率进一步降低,但理化特性得到提升,含氧量、pH值、运动黏度和高位热值分别达到16.45%、5.00、5.10 mm2·s-1和34.25 MJ·kg-1;低温等离子体放电的协同作用使Zn/HZSM-5的裂解脱氧性能得到增强,精制生物油中烃类含量和组成均有明显提升和改善,多环芳香烃明显减少,单环芳香烃占比显著升高;Zn/HZSM-5的抗结焦性能得到进一步增强,但反应物较低的有效氢碳比使精制生物油燃料品位和催化剂稳定性难以得到实质性提升。因此,需进一步从原料角度切入,提高催化提质过程中可有效转移利用的氢元素。

A non-thermal plasma synergistic catalytic system was established, which was used in bio-oil upgrading catalyzed by Zn/HZSM-5. Effects of three-way catalysis(including non-thermal plasma, HZSM-5 and a Zn modified component) on bio-oil quality and catalyst coking were analyzed. The results show that the three-way catalysis reduces the yield of refined bio-oil, but improves its physicochemical properties. Oxygen content, pH kinematic viscosity and gross caloric value are 16.45%, 5.00, 5.10 mm2?s-1 and 34.25 MJ?kg-1, respectively. The synergistic action of non-thermal plasma discharge enhances the deoxidization performance of Zn/HZSM-5. Both content and composition of alkane in refined bio-oil are improved. Polycyclic aromatic hydrocarbons are significantly reduced and monocyclic aromatic hydrocarbons are increased. The coking resistance of Zn/HZSM-5 is enhanced, but low effective hydrogen to carbon ratio of reactants makes it difficult to have substantial improvement in catalytic stability. Therefore, it is necessary to evaluate raw material to improve hydrogen contents, which can be effectively transferred and utilized in the process of catalytic upgrading.