Hydrothermal liquefaction (HTL) of Ulva prolifera macroalgae (UP) was carried out in the presence of three zeolites based catalysts (ZSM-5, Y-Zeolite and Mordenite) with the different weight percentage (10–20 wt%) at 260–300 °C for 15–45 min. A comparison between non-catalytic and catalytic behavior of ZSM-5, Y-Zeolite, and Mordenite in the conversion of Ulva prolifera showed that is affected by properties of zeolites. Maximum bio-oil yield for non-catalytic liquefaction was 16.6 wt% at 280 °C for 15 min. The bio-oil yield increased to 29.3 wt% with ZSM-5 catalyst (15.0 wt%) at 280 °C. The chemical components and functional groups present in the bio-oils are identified by GC-MS, FT-IR, ¹H-NMR, and elemental analysis techniques. Higher heating value (HHV) of bio-oil (32.2–34.8 MJ/kg) obtained when catalyst was used compared to the non-catalytic reaction (21.2 MJ/kg). The higher de-oxygenation occurred in the case of ZSM-5 catalytic liquefaction reaction compared to the other catalyst such as Y-zeolite and mordenite. The maximum percentage of the aromatic proton was observed in bio-oil of ZSM-5 (29.7%) catalyzed reaction and minimum (1.4%) was observed in the non-catalyst reaction bio-oil. The use of zeolites catalyst during the liquefaction, the oxygen content in the bio-oil reduced to 17.7%. Aqueous phase analysis exposed that presence of valuables nutrients.

Ulva prolifera macroalgae（UP）的水热液化（HTL）在三种沸石基催化剂（ZSM-5，Y-沸石和丝光沸石）的存在下进行的，两种催化剂的重量百分比（10-20 wt％）在260-300 °C 15–45分钟。比较ZSM-5，Y-沸石和丝光沸石在Ulva增殖剂转化中的非催化和催化行为表明，它受沸石性能的影响。非催化液化的最大生物油产率在280°C下15分钟为16.6 wt％。在280°C下使用ZSM-5催化剂（15.0 wt％），生物油产率提高到29.3 wt％。生物油中存在的化学成分和官能团通过GC-MS，FT-IR，¹进行鉴定1 H-NMR和元素分析技术。与非催化反应（21.2 MJ / kg）相比，使用催化剂时获得的生物油发热量（HHV）更高（32.2–34.8 MJ / kg）。与其他催化剂（例如Y沸石和丝光沸石）相比，在ZSM-5催化液化反应中发生的脱氧更高。在ZSM-5催化的生物油中观察到最大的芳香族质子百分比（29.7％），在非催化反应的生物油中观察到最小的1.4％。在使用液化过程中使用沸石催化剂时，生物油中的氧含量降低到17.7％。水相分析表明有价值的营养物质的存在。