Muñoz Marta, Morales Irene, Costa Cátia S, Multigner Marta, de la Presa Patricia, Alonso Jose M, Silva João M, Ribeiro Maria do Rosário, Torres Belén, Rams Joaquín
Department of Applied Mathematics, Materials Science and Engineering and Electronic Technology, Rey Juan Carlos University, 28933 Madrid, Spain.
Institute of Applied Magnetism, UCM-ADFI-CSIC, 28230 Las Rozas, Spain.
Materials (Basel). 2021 Feb 22;14(4):1029. doi: 10.3390/ma14041029.
Zeolites are widely used in high-temperature oil refining processes such as fluid catalytic cracking (FCC), hydrocracking, and aromatization. Significant energy cost are associated with these processes due to the high temperatures required. The induction heating promoted by magnetic nanoparticles (MNPs) under radio frequency fields could contribute to solving this problem by providing a supplementary amount of heat in a nano-localized way, just at the active centre site where the catalytic process takes place. In this study, the potential of such a complementary route to reducing energetic requirements is evaluated. The catalytic cracking reaction under a hydrogen atmosphere (hydrocracking) applied to the conversion of plastics was taken as an application example. Thus, a commercial zeolite catalyst (H-USY) was impregnated with three different magnetic nanoparticles: nickel (Ni), cobalt (Co), maghemite (γ-FeO), and their combinations and subjected to electromagnetic fields. Temperature increases of approximately 80 °C were measured for H-USY zeolite impregnated with γ-FeO and Ni-γ-FeO due to the heat released under the radio frequency fields. The potential of the resulting MNPs derived catalyst for HDPE (high-density polyethylene) conversion was also evaluated by thermogravimetric analysis (TGA) under hydrogen atmosphere. This study is a proof of concept to show that induction heating could be used in combination with traditional resistive heating as an additional energy supplier, thereby providing an interesting alternative in line with a greener technology.
沸石广泛应用于高温炼油过程，如流化催化裂化（FCC）、加氢裂化和芳构化。由于这些过程需要高温，因此能耗巨大。在射频场下，磁性纳米颗粒（MNP）促进的感应加热可以通过以纳米局部化的方式提供额外的热量，即在催化过程发生的活性中心部位，来有助于解决这个问题。在本研究中，评估了这种补充途径降低能源需求的潜力。以在氢气气氛下的催化裂化反应（加氢裂化）应用于塑料转化为例。因此，将一种商业沸石催化剂（H-USY）用三种不同的磁性纳米颗粒浸渍：镍（Ni）、钴（Co）、磁赤铁矿（γ-FeO）及其组合，并置于电磁场中。由于在射频场下释放的热量，对于浸渍有γ-FeO和Ni-γ-FeO的H-USY沸石，测得温度升高约80℃。还通过在氢气气氛下的热重分析（TGA）评估了所得MNP衍生催化剂用于高密度聚乙烯（HDPE）转化的潜力。本研究是一个概念验证，表明感应加热可以与传统电阻加热结合使用，作为额外的能源供应方式，从而提供一种符合绿色技术的有趣替代方案。
