NPSC体系下Ti/HZSM-5在线催化裂解生物油的实验研究

In-situ Catalytic Cracking of Bio-Oil by Employing Ti/HZSM-5 Under NPSC System

采用离子交换法对HZSM-5进行了Ti负载改性,利用SEM(EDS)、XRD、BET和Py-IR对Ti/HZSM-5进行了表征;建立了低温等离子体协同催化(Non-thermal plasma synergistic catalysis,NPSC)体系,并在该体系下利用Ti/HZSM-5进行了在线催化裂解生物油的研究,分析了"三效"(包括低温等离子体、HZSM-5本身和改性成分)催化对生物油品质以及催化剂稳定性的影响。结果表明,精制生物油产率降低,但其理化特性得到明显提升,高位热值达37.02 MJ/kg;精制生物油中烃类含量和组成均得到明显提升和改善,低温等离子体技术的协同作用,有效增强了裂解脱氧性能,烃类质量分数达89.49%,且多环芳香烃(Polycyclic aromatic hydrocarbons,PAHs)明显减少,但精制生物油仍属缺氢燃料;Ti改性成分与高能放电、HZSM-5之间存在多重交互作用,较强的裂解性能使Ti/HZSM-5结焦量有所增加,并出现两类焦炭"同构化"现象,较低的(nH/nC)eff使催化剂稳定性难以得到实质性提升。

HZSM-5 was modified with Ti by ion exchange method and the modified catalyst was characterized by using SEM（EDS）,XRD,BET and Py-IR.A non-thermal plasma synergistic catalytic（NPSC）system was established,and the catalytic cracking of bio-oil was studied by using Ti/HZSM-5 under NPSC system.The effects of ＂three-way＂（including non-thermal plasma,HZSM-5 itself and modified component）on the bio-oil quality and the catalyst stability were analyzed.The results showed that the yield of refined bio-oil was further reduced,but the physicochemical properties were enhanced obviously.The higher heating value reached 37.02 MJ/kg.The content and composition of hydrocarbons in refined bio-oil were both improved significantly.The synergistic action of non-thermal plasma technology enhanced the deoxidization performance of Ti/HZSM-5 significantly,and reduced the PAHs obviously.The total hydrocarbon content in refined bio-oil was high of 89.49%.But the refined bio-oil still belonged to hydrogen deficient fuel.The Ti modified component had multiple interactions with high-energy discharge and catalyst itself.The cracking property of catalyst increased the amount of coke,and the phenomenon of isomorphism of two kinds of coke occurred.The lower（nH/nC）effmade it difficult to get substantial improvement in catalytic stabilization.