TiO2 nanotubes supported NiW hydrodesulphurization catalysts: Characterization and activity

• Published in: Applied surface science Vol. 265; pp. 309 - 316
• Main Authors: Palcheva, R., Dimitrov, L., Tyuliev, G., Spojakina, A., Jiratova, K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2013; Elsevier
• Subjects: Catalysis; Catalysts; Chemistry; Clusters, nanoparticles, and nanocrystalline materials; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Infrared and Raman spectra; Infrared and raman spectra and scattering; Materials science; Nano-structured TiO2; Nanoscale materials and structures: fabrication and characterization; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Nanotubes; Nickel; NiW catalysts; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other topics in nanoscale materials and structures; Physics; Raman spectroscopy; Structure of solids and liquids; crystallography; Thiophene hydrodesulphurization; Titanium; Titanium dioxide; X-ray photoelectron spectroscopy; XPS; Nano-structured TiO2; NiW catalysts; XPS; Thiophene hydrodesulphurization; Nano-structured TiO; Transition element compounds; Nanotube; Supported catalyst; Inorganic compound; Transmission electron microscopy; Titanium oxide; Catalyst activity; Raman spectrum; Hydrodesulfurization; X-ray photoelectron spectra
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.11.001

[Display omitted] ▸ NiW catalysts supported on TiO2 nanotubes, titania and alumina. ▸ The best results are obtained with NiW/TiO2 nanotubes in hydrodesulfurization (HDS) of thiophene. ▸ Active phase is Ni-WOxSy. ▸ Electronic promotion of W by Ti. High surface area TiO2 nanotubes (Ti-NT) synthesized by alkali hydrothermal method were used as a support for NiW hydrodesulphurization catalyst. Nickel salt of 12-tungstophosphoric acid – Ni3/2PW12O40 was applied as oxide precursor of the active components. The catalyst was characterized by SBET, XRD, UV–vis DRS, Raman spectroscopy, XPS, TPR and HRTEM. The results obtained were compared with those for the NiW catalysts prepared over high surface area titania and alumina supports. A polytungstate phase evidenced by Raman spectroscopy was observed indicating the destruction of the initial heteropolyanion. The catalytic experiments revealed two times higher thiophene conversion on NiW catalyst supported on Ti-NT than those of catalysts supported on alumina and titania. Increased HDS activity of the NiW catalyst supported on Ti-NT could be related to a higher amount of W oxysulfide entities interacting with Ni sulfide particles as consequence of the electronic effects of the Ti-NT observed with XPS analysis.