We report a new process to realize the deep removal of N, O, and S from the bio-oil when using a batch reactor to do the hydro-upgrading experiments. That is, within a fixed reaction time, hydro-upgrading of the bio-oil was carried out in several stages. After each stage reaction was finished, the reactor was cooled, and the gas in the reactor was replaced with fresh hydrogen, and then the reaction continued until the total reaction time was complete. A bio-oil produced from hydrothermal liquefaction of microalgae mixed with tetralin at a mass ratio of 1:1 was used as the feedstock. The experiments were performed at different temperatures (300–480 °C) and time (1–8 h) with fixed addition of 10 wt% Pt/C and 8 MPa H₂. Higher treated bio-oil yield was always achieved if the reaction was performed in several stages. The N-, O-, and S- containing compounds in the gaseous products mainly consisted of C₂H₄N, C₃H₇N, C₆H₇N, NH₃, (SCN)₂, SO₂, and H₂O. The removal of these gas products avoided their secondary reactions with the bio-oil and slowed down the catalyst poisoning, and thus breaking through the equilibrium limitations of denitrogenation, desulfurization, and deoxygenation and prolonging the activity of the catalyst.

我们报告了一种新工艺，可在使用间歇式反应器进行加氢改质实验时实现生物油中 N、O 和 S 的深度去除。也就是说，在固定的反应时间内，生物油的加氢改质分几个阶段进行。每段反应结束后，将反应器冷却，用新鲜氢气置换反应器中的气体，然后继续反应直至反应时间结束。以微藻水热液化生产的生物油与四氢萘以1:1的质量比混合作为原料。实验在不同温度 (300–480 °C) 和时间 (1–8 h) 下进行，固定添加 10 wt% Pt/C 和 8 MPa H ₂. 如果反应分几个阶段进行，总能达到更高的处理生物油收率。气态产物中含N、O、S的化合物主要有C ₂ H ₄ N、C ₃ H ₇ N、C ₆ H ₇ N、NH ₃、(SCN) ₂、SO ₂和H ₂ O.这些气体产物的去除避免了它们与生物油的二次反应，减缓了催化剂中毒，从而突破了脱氮、脱硫、脱氧的平衡限制，延长了催化剂的活性。