Synergism between Ni and W in the NiW/gama-Al2O3 Hydrotreating Catalysts

0028758 - UCHP-M 20050212 RIV US eng J - Journal Article
Spojakina, A.A. - Palcheva, R. - Jirátová, Květa - Tyuliev, G. - Petrov, L.
Synergism between Ni and W in the NiW/gama-Al2O3 Hydrotreating Catalysts.
[Synergismus mezi Ni a W v NiW/gama-Al2O3 odsiřovacích katalyzátorech.]
Catalysis Letters. Roč. 104, 1-2 (2005), s. 45-52. ISSN 1011-372X. E-ISSN 1572-879X
Institutional research plan: CEZ:AV0Z40720504
Keywords : NiW/gama-Al2O3 * Thiophene hydrodesulfurization * TPR, XPS
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.088, year: 2005

A series of NiW/ c-Al2O3 catalysts (20 and 30 wt% W and 1–5 wt% Ni) have been prepared and studied by TPR and XPS. HDS activity has been tested in the thiophene conversion. The e?ect of Ni and W loadings on the formation of di?erent structures is presented. In the calcined catalysts several phases coexist, concentrations of which depend on the Ni/(Ni+W) atomic ratio. The Ni synergistic e?ect in the HDS reaction is con?rmed by the increase in the HDS activity ( 10–15 times). This e?ect is ascribed to the formation of an active NiWS phase of high dispersion from the mixed NiW oxide precursors. At higher Ni/Ni+W ratio a redistribution of active components in additional amount ofNiWS phase during sul?dation is suggested.

Řada NiW/gama-Al2O3 katalyzátorů (20 a 30 hm% W a 1–5 hm% Ni) byla připravena a studována metodami TPR a XPS. Byla nalezena 10-15x vyšší HDS aktivita NiW katalyzátorů. Důvodem je vysoká dispersita směsné NiWS fáze.
Permanent Link: http://hdl.handle.net/11104/0118671