Preparation and performance of noble metal phosphides supported on silica as new hydrodesulfurization catalysts

• Published in: Applied catalysis. A, General Vol. 386; no. 1; pp. 171 - 178
• Main Authors: Kanda, Yasuharu, Temma, Chisato, Nakata, Keisuke, Kobayashi, Takao, Sugioka, Masatoshi, Uemichi, Yoshio
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 30.09.2010; Elsevier
• Subjects: Catalysis; Catalysts; Chemistry; Exact sciences and technology; General and physical chemistry; Hydrodesulfurization; Noble metal phosphide catalyst; Noble metals; Palladium; Phosphides; Platinum; Reduction; Silicon dioxide; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Thiophene; Noble metal phosphide catalyst; Thiophene; Hydrodesulfurization; Binary compound; Five membered ring; Support; Hydrogen; X ray; High temperature; Silica; Particle; Chemical reduction; Energy; Noble metal; Aluminium oxide; Catalytic reaction; X ray diffraction; Heterogeneous catalysis; Sulfur heterocycle; Transmission electron microscopy; Silicon oxides; Preparation; Catalyst activity; Alumina; Catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2010.07.045

[Display omitted] ▶The P-added noble metal (NM-P)/SiO 2 catalysts, except Pt, showed higher HDS activities than noble metal (NM)/SiO 2 catalysts. ▶The HDS activity of the Rh-P/SiO 2 catalyst was the highest among those of NM-P/SiO 2 catalysts. ▶This activity was higher than that of the Ni-P catalyst and was the same as that of the pre-sulfided CoMoP/Al 2O 3 HDS catalyst. Preparation of noble metal (NM) (Rh, Pd, Ru, Pt) phosphide species and their catalytic activities for hydrodesulfurization (HDS) of thiophene were investigated. Noble metal phosphides (NM X P Y ) catalysts were prepared by reduction of P-added NM (NM-P) supported on silica (SiO 2) with hydrogen. Hydrogen consumption peaks at around 350–700 °C, which were attributed to the formation of NM X P Y , were observed in temperature-programmed reduction (TPR) spectra of all NM-P/SiO 2. Furthermore, X-ray diffraction (XRD) patterns of NM-P/SiO 2 indicate that NM X P Y (Rh 2P, Pd 4.8P, Ru 2P, PtP 2) were formed by hydrogen reduction at high temperature. The reduction temperature strongly affected HDS activities of NM-P/SiO 2 catalysts. The NM-P/SiO 2 catalysts, other than Pt, showed higher HDS activities than NM/SiO 2 catalysts. The HDS activity of the Rh-P/SiO 2 catalyst was the highest among those of NM-P/SiO 2 catalysts. This activity was higher than that of the Ni-P catalyst and was the same as that of pre-sulfided CoMoP/Al 2O 3 catalyst. Furthermore, the Rh-P/SiO 2 catalyst showed stable activity even after reaction for 30 h. The XRD, transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS) results revealed that the formation of small Rh 2P particles and suitable P addition to form Rh 2P caused the high HDS activity of the Rh-P catalyst.