微藻油脂一步联产航空煤油范围正构烷烃和芳烃

One step co-production of jet fuel range n-alkanes and aromatic hydrocarbons from microalgal lipids

以3种分子筛(HZSM-5、Hbeta、HY)负载镍作为催化剂用于催化微藻油脂制备航空煤油范围正构烷烃和芳烃。通过X射线衍射(XRD)鉴定了Ni/HZSM-5、Ni/Hbeta、Ni/HY催化剂的物相,以氢气程序升温还原(H_(2)-TPR)表征了催化剂的氧化还原特性。在400℃时,对3种催化剂的活性进行了评价,并对催化反应温度进行优化。结果表明:Ni成功负载于3种分子筛上,Ni/HZSM-5和Ni/Hbeta中NiO较易被还原,而Ni/HY中的NiO不易被还原;Ni/HZSM-5展现出较好的航空煤油范围烃类选择性,航空煤油范围烃类产率达25.72%;在Ni/HZSM-5催化剂作用下,反应温度为420℃所得液体产物中航空煤油范围正构烷烃和芳烃比例最优,产率分别为17.25%和16.40%。

Ni loaded in three zeolites(HZSM-5, Hbeta, HY) was used to catalyze the conversion of microalgae lipids into jet fuel range n-alkanes and aromatic hydrocarbons.The phases of Ni/HZSM-5, Ni/Hbeta and Ni/HY catalysts were identified by X-ray diffraction(XRD), and the redox characteristics of the catalysts were characterized by H_(2)-TPR. The activity of the three catalysts was evaluated at 400℃,and the catalytic reaction temperature was optimized.The results showed that Ni was successfully loaded in the three zeolites, and NiO in Ni/HZSM-5 and Ni/Hbeta were more easy to be reduced, while NiO in Ni/HY was difficult to be reduced. Ni/HZSM-5 showed the best jet fuel range hydrocarbon selectivity, with total yield of jet fuel range n-alkanes and aromatic hydrocarbons 25.72%.When the reaction temperature was 420℃, the ratio of jet fuel range n-alkanes to aromatic hydrocarbons was the best in the liquid product with Ni/HZSM-5 as catalyst and the yields of n-alkanes and aromatic hydrocarbons were 17.25% and 16.40%,respectively.