Chemical Department, Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116, 90-543 Lodz, Poland.
Molecules. 2024 Nov 15;29(22):5380. doi: 10.3390/molecules29225380.
The aim of this work was to investigate the hydrocracking of algae oil derived from Spirulina Platensis species catalyzed with bi-component nickel-zirconia catalysts supported onto different carriers (BEA, ZSM-5 and AlO) in an autoclave at 320 °C for 2 h with a hydrogen pressure of 75 bar. All catalysts were prepared using the wet co-impregnation method and were characterized by H-TPR, XRD, NH-TPD, BET and SEM-EDS. Before reactions, catalysts were calcined at 600 °C for 4 h in a muffle furnace, then reduced with 5%H-95%Ar reducing mixture at 500 °C, 600 °C or 700 °C for 2 h. The obtained products were analyzed and identified by HPLC and GC-MS techniques. In addition to the investigation of the support effect, the influence of the reduction temperature of catalytic systems on the catalytic activity and selectivity of the products was also examined. The activity results show that Ni-Zr systems supported on zeolites exhibited high conversion of algal oil. A gradual decrease in conversion was observed when increasing the reduction temperature of the catalyst (from 500 °C to 600 °C and 700 °C) for BEA zeolite catalysts. The reaction products contain hydrocarbons from C to C (for zeolite-supported catalysts) and C (for systems on AlO). The identified hydrocarbons mainly belong to the gasoil fraction (C-C). In the research, the best catalyst for the algal oil hydrocracking reaction was found to be the 5%Ni-5%Zr/BEA system reduced at 600 °C, which exhibited the second highest algal oil conversion (94.0%). The differences in catalytic activity that occur are due to the differences in the specific surface area among the supports and to differences in the acidity of the catalyst surface depending on the reduction temperature.
本工作旨在研究在 320°C、75 巴氢气压力下，用双组分镍-氧化锆催化剂在高压釜中催化来自螺旋藻属物种的藻油加氢裂化，所用催化剂负载在不同载体（BEA、ZSM-5 和 AlO）上。所有催化剂均采用湿共浸渍法制备，并通过 H-TPR、XRD、NH-TPD、BET 和 SEM-EDS 进行了表征。反应前，催化剂在马弗炉中于 600°C 下煅烧 4 小时，然后在 5%H-95%Ar 还原混合气中于 500°C、600°C 或 700°C 下还原 2 小时。采用 HPLC 和 GC-MS 技术对所得产物进行分析和鉴定。除了考察载体的影响外，还研究了催化体系还原温度对产物催化活性和选择性的影响。活性结果表明，负载在沸石上的 Ni-Zr 体系表现出藻油的高转化率。当催化剂的还原温度（从 500°C 升高到 600°C 和 700°C）升高时，BEA 沸石催化剂的转化率逐渐降低。反应产物含有从 C 到 C（对于沸石负载催化剂）和 C（对于负载在 AlO 上的体系）的烃类。鉴定出的烃类主要属于中间馏分油（C-C）。在研究中，发现用于藻油加氢裂化反应的最佳催化剂是在 600°C 下还原的 5%Ni-5%Zr/BEA 体系，其藻油转化率最高（94.0%）。催化活性的差异是由于载体的比表面积不同以及催化剂表面的酸性随还原温度的不同而不同。
