NiO/HZSM-5催化改性生物油模拟物研究

Model Component of Bio-oil Upgrading by NiO /HZSM-5 Catalyst

以HZSM-5为载体,通过浸渍法制备不同NiO负载量的NiO/HZSM-5催化剂并进行表征,发现负载量为8%的催化剂表面形貌相对平整,比表面积、酸位等特性较理想。通过生物油模拟物催化试验对催化剂性能进行评价,试验结果表明负载量和反应温度都对催化剂活性有明显影响。在反应温度为400℃时,负载量为8%的催化剂使模拟物中甲苯和愈创木酚具有较好的转化率,分别达到83%和88%;较HZSM-5催化的情况分别提高60%和70%。改性后生物油的热值也可增加约30%。负载物NiO的加入使催化剂表面强酸位降低约45%,同时提高了催化剂的稳定性和抗积碳能力,延长了催化剂使用寿命,其中8-ZSM-5催化剂在反应6 h后仍保持较高活性。

NiO/HZSM- 5 catalysts with different NiO contents were prepared by impregnation method and their property was investigated. The surface performance tests showed taht the catalyst with 8% loading metal （8- ZSM- 5） had satisfied surface morphology and structure. The catalytic activity of NiO/HZSM - 5 catalyst was evaluated via the experimental study on catalytic bio-oil model in a self made biomass continuous pyrolysis system. The results showed that the reaction activities of the catalysts were greatly influenced by the NiO content and the catalytic temperature. When the reaction temperature was 400~C and catalyst loading metal was 8% ,the catalyst made the percent conversion of the toluene and guaiacol reach 80% and 85% respectively, which increased 60% and 70% compared with only HZSM- 5 catalyst acting. The heat value of upgrading bio-oil model could increase 30% as well. Meanwhile, the addition of NiO decreased the Bronsted acidity by 45% , and improved anti-carbon ability and stability of catalyst, and the lifetime of the catalyst was extented as well. The 8 - ZSM - 5 catalyst kept the high catalysis activity after 6 h reaction.