Structure and Activity of Ni<sub>2</sub>P/Desilicated Zeolite β Catalysts for Hydrocracking of Pyrolysis Fuel Oil into Benzene, Toluene, and Xylene
oleh: Yong-Su Kim, Kye-Sung Cho, Yong-Kul Lee
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-01-01 |
Deskripsi
The effects of desilication (DS) of the zeolite β on the hydrocracking of polycyclic aromatics were investigated using the Ni<sub>2</sub>P/β catalysts. The Ni<sub>2</sub>P/β catalysts were obtained by the temperature-programmed reduction (TPR) method, and the physical and chemical properties were examined by N<sub>2</sub> physisorption, X-ray diffraction (XRD), <sup>27</sup>Al magic angle spinning−nuclear magnetic resonance (<sup>27</sup>Al MAS NMR), extended X-ray absorption fine structure (EXAFS), isopropyl amine (IPA) and NH<sub>3</sub> temperature-programmed desorption (TPD), CO uptake, and thermogravimetric analysis (TGA). The catalytic activity was examined at 653 K and 6.0 MPa in a continuous fixed bed reactor for the hydrocracking (HCK) of model compounds of 1-methylnaphthalene (1-MN) and phenanthrene or a real feedstock of pyrolysis fuel oil (PFO). Overall, the Ni<sub>2</sub>P/DS-β was observed as more active and stable in the hydrocracking of polycyclic aromatics than the Ni<sub>2</sub>P/β catalyst. In addition, the Ni<sub>2</sub>P/β suffered from the coke formation, while the Ni<sub>2</sub>P/DS-β maintained the catalytic stability, particularly in the presence of large polycyclic hydrocarbons in the feed.