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Well-dispersed nickel nanoparticles on the external and internal surfaces of SBA-15 for hydrocracking of pyrolyzed α-cellulose

机译:SBA-15外表面和内表面上分散良好的镍纳米颗粒,用于热解α-纤维素的加氢裂化

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Catalysts comprising nickel supported on SBA-15 were prepared by wet impregnation and co-impregnation methods. Wet impregnation was performed by directly dispersing an Ni(NO _(3) ) _(2) ·6H _(2) O aqueous solution into SBA-15, whereas in co-impregnation, ethylene glycol (EG) was added to nickel nitrate aqueous solution prior to dispersion into SBA-15. After drying and calcination, NiO/SBA-15w and NiO/SBA-15c were produced. Later, after the reduction process, Ni/SBA-15w and Ni/SBA-15c were obtained. The prepared catalysts were evaluated for the hydrocracking of pyrolyzed α-cellulose. The TEM images revealed that the catalysts prepared by wet impregnation showed inhomogeneous distribution of nickel loading, whereas catalysts prepared by co-impregnation using EG exhibited homogeneous distribution and formed no nickel aggregates. During hydrocracking of pyrolyzed α-cellulose, Ni/SBA-15c with total acidity, nickel loading, particle size, and specific surface area of 7.27 m mol g ~(?1) , 5.20 wt%, 3.17 nm, and 310.0 m ~(2) g ~(?1) , respectively, exhibited the best catalytic performance compared to other prepared catalysts with 67.35 wt% conversion of liquid product with maximum selectivity in producing 13.09 wt% of 3-methyl-pentane. Moreover, Ni/SBA-15w with total acidity, nickel loading, particle size, and specific surface area of 10.87 m mol g ~(?1) , 8.15 wt%, 7.01 nm, and 628.0 m ~(2) g ~(?1) , respectively, produced 69.89 wt% liquid product without hydrocarbons. Study of selectivity towards the formation of liquid hydrocarbons was carried out via double step hydrocracking using Ni/SBA-15w, and 18.55 wt% of n -hexane was produced in the liquid product.
机译:通过湿浸渍和共浸渍方法制备了负载在SBA-15上的包含镍的催化剂。通过将Ni(NO _(3)_(2)·6H _(2)O水溶液直接分散到SBA-15中进行湿浸渍,而在共浸渍中,将乙二醇(EG)添加到硝酸镍中水溶液,然后分散到SBA-15中。干燥并煅烧后,制得NiO / SBA-15w和NiO / SBA-15c。之后,在还原过程之后,获得Ni / SBA-15w和Ni / SBA-15c。评估了所制备的催化剂对热解α-纤维素的加氢裂化。 TEM图像显示,通过湿浸渍制备的催化剂显示出镍负载量的不均匀分布,而通过使用EG共浸渍制备的催化剂显示出均匀分布并且没有形成镍聚集体。在热解α-纤维素加氢裂化过程中,Ni / SBA-15c的总酸度,镍负载量,粒径和比表面积为7.27 m mol g〜(?1),5.20 wt%,3.17 nm和310.0 m〜( 2)与其它制备的催化剂相比,g〜(α1)分别显示出最佳的催化性能,其中液体产物的转化率为67.35wt%,在生产13.09wt%的3-甲基戊烷中具有最大选择性。此外,Ni / SBA-15w的总酸度,镍负载量,粒径和比表面积分别为10.87 m mol g〜(?1),8.15 wt%,7.01 nm和628.0 m〜(2)g〜(?)。 1)分别生产69.89 wt%的无烃液体产品。通过使用Ni / SBA-15w的双步加氢裂化进行了对形成液态烃的选择性的研究,并且在液态产物中产生了18.55wt%的正己烷。

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