碱处理HZSM-5分子筛在线催化提质生物油

Online upgrading of bio-oil with alkali-treated HZSM-5 zeolites

采用NaOH溶液对HZSM-5分子筛进行碱处理,利用XRD、SEM、BET、Py-FTIR四种方法表征改性HZSM-5分子筛,对生物原油有机相、未改性HZSM-5制得生物油有机相与改性HZSM-5制得生物油有机相进行理化特性及成分分析,研究了碱处理HZSM-5分子筛对生物油有机相产物的影响;对使用了120 min的三种失活催化剂进行了热重分析,并对焦炭峰面积进行了积分计算。结果表明,经过碱处理后的HZSM-5分子筛保留了典型的MFI拓扑结构,形成了一定数量的介孔;同时,经碱处理1 h的HZSM-5分子筛催化制得的生物油有机相产物的产率有所增加且理化特性得到提高,其产物中烃类物质的含量显著增加,达到了37.67%,且以单环芳香烃为主;同时改性HZSM-5分子筛对生物油有机相中的酸、醛及酮类物质均有较好的脱除效果,有效地降低了生物油的腐蚀性并提升了生物油的稳定性,热值达到了35.32 MJ/kg;经1 h碱处理的HZSM-5分子筛的总结焦量明显降低。

HZSM-5 zeolite was treated by sodium hydroxide solution,and then characterized by XRD,SEM,BET and Py-FTIR,respectively. Physical and chemical properties and composition analysis was applied to the organic phase of bio-oils. Thermogravimetric analysis was performed on three deactivated catalysts after using for 120 min and the peak area of char was calculated. The results show that the alkali-treated HZSM-5 catalyst retains typical MFI topology structure and forms a certain number of mesoporous. At the same time,the bio-oil organic phase made with modified HZSM-5（ after 1 h treatment） achieves a higher yield rate and better physical properties. The content of hydrocarbons increases significantly to 37. 67% mainly with the increase of mononuclear aromatics. In addition,modified HZSM-5 catalyst（ after 1 h treatment） has a better effect on the removal of acid,aldehyde and ketone contained in the bio-oil organic phase,which improves stability of the biooil with calorific value of 35.32 MJ/kg. The amount of coke in the HZSM-5 zeolite after 1 h alkali treatment obviously decreases.