Panarmasar Nipitpon, Hinchiranan Napida, Guo Limin, Kuchonthara Prapan
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Bangkok 10330, Thailand.
Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC), Chulalongkorn University, Phayathai Road, Bangkok 10330, Thailand.
ACS Omega. 2025 Aug 5;10(32):35850-35864. doi: 10.1021/acsomega.5c02800. eCollection 2025 Aug 19.
This study investigated the catalytic performance of Ni-based catalysts supported on micromesoporous composites derived from the incorporation of SBA-15 with USY-(SBA-15-xUSY) or Hbeta-(SBA-15-xHbeta) zeolites (where x is wt percentage of zeolite fraction in the composite) for palm oil hydroisomerization to produce biojet fuel range. The hydroisomerization was conducted in a fixed-bed reactor under 25 bar of H pressure at 40 mL/min, 425 °C, 0.1 mL/min palm oil feed rate, and 5 g of catalyst. It was observed that the support materials significantly influenced catalytic activity and product selectivity. In the case of zeolite supports, the Ni-based catalysts supported by USY zeolite showed the highest liquid product yield (54.3 wt %) and iso-to-normal (i-/-) alkane ratio of 1.43, whereas those supported on Hbeta zeolite provide the lower yield of liquid biofuel with high gasoline fraction (25.5%) and i-/-alkane ratio of 2.58. The micromesoporous composite supports enhanced specific surface area and pore size to decrease the mass transfer limitation, resulting in better catalytic performance. The Ni/SBA-15-50USY and Ni/SBA-15-50Hbeta catalysts exhibited the highest selectivity to biojet fuel-range hydrocarbons, reaching 78.8 and 76.7 wt %, respectively. Moreover, the Ni/SBA-15-xHbeta catalyst promoted significantly higher selectivity to the iso-alkanes fraction in the obtained liquid biofuels than Ni/SBA-15-xUSY catalysts. The maximum i-/-alkanes ratio at 3.45 was achieved for the system using Ni/SBA-15-30Hbeta catalyst, demonstrating the beneficial role of SBA-15 in boosting diffusion and catalytic efficiency. This result suggested that the integration of BEA zeolite crystals into the mesoporous SBA-15 structure allowed the closer proximity between the Ni-metal and Brønsted acid sites to optimize the hydrocracking efficiency for biojet fuel production.
本研究考察了负载于由SBA - 15与USY -（SBA - 15 - xUSY）或Hbeta -（SBA - 15 - xHbeta）沸石（其中x为沸石在复合材料中的质量分数）复合而成的微介孔复合材料上的镍基催化剂对棕榈油加氢异构化制备生物喷气燃料馏分的催化性能。加氢异构化在固定床反应器中进行，氢气压力为25 bar，流量40 mL/min，温度425℃，棕榈油进料速率0.1 mL/min，催化剂用量5 g。结果表明，载体材料对催化活性和产物选择性有显著影响。就沸石载体而言，负载于USY沸石的镍基催化剂液体产物收率最高（54.3 wt%），异/正（i - /n -）烷烃比为1.43，而负载于Hbeta沸石的催化剂液体生物燃料收率较低，但汽油馏分含量高（25.5%），异/正烷烃比为2.58。微介孔复合载体增大了比表面积和孔径，降低了传质限制，从而具有更好的催化性能。Ni/SBA - 15 - 50USY和Ni/SBA - 15 - 50Hbeta催化剂对生物喷气燃料馏分烃的选择性最高，分别达到78.8 wt%和76.7 wt%。此外，与Ni/SBA - 15 - xUSY催化剂相比，Ni/SBA - 15 - xHbeta催化剂对所得液体生物燃料中异构烷烃馏分的选择性显著更高。使用Ni/SBA - 15 - 30Hbeta催化剂的体系实现了最大异/正烷烃比3.45，证明了SBA - 15在促进扩散和催化效率方面的有益作用。该结果表明，将BEA沸石晶体整合到介孔SBA - 15结构中可使镍金属与布朗斯特酸位点更紧密接近，从而优化生物喷气燃料生产的加氢裂化效率。
