NiMo Catalysts Supported on Al-Based Mixed Oxide Prepared By Hydrothermal Method: Effect of Zn/Al Ratio and Addition of Silica on HDS Activity

0532119 - ÚCHP 2021 RIV US eng J - Journal Article
Palcheva, R. - Kaluža, Luděk - Moravčík, Jan - Tyuliev, G. - Dimitrov, L. - Jirátová, Květa - Avdeev, G. - Tenchev, K. - Spojakina, A.
NiMo Catalysts Supported on Al-Based Mixed Oxide Prepared By Hydrothermal Method: Effect of Zn/Al Ratio and Addition of Silica on HDS Activity.
Catalysis Letters. Roč. 150, č. 11 (2020), s. 3276-3286. ISSN 1011-372X. E-ISSN 1572-879X
R&D Projects: GA ČR GA17-22490S
Institutional support: RVO:67985858
Keywords : NiMo/al–znx catalysts * silica addition * 12-molybdophosphoric acid
OECD category: Physical chemistry
Impact factor: 3.186, year: 2020
Method of publishing: Limited access

The effect of Zn/Al ratio and addition of silica to Al–Znx oxides on the structure and catalytic properties of supported NiMo catalysts in hydrodesulfurization reaction of thiophene was studied. Colloidal SiO2 was added to the Al–Znx oxides (Si/Al = 0.3 ratio) to modify textural and structural properties of NiMo catalysts. The surface area of the supports calcined at 500 °C, decreases with the increasing Zn/Al ratio, which could be due to the interaction of the Zn with the alumina, leading to formation of Zn-spinel. After impregnation of the supports with NiMo active components, the presence of Zn increases the amount of surface Mo in octahedral sites at Zn/Al = 0.21 ratio. At this ratio maximum in HDS activity of NiMo/Al–Znx samples was observed. Addition of silica to Al-Zn mixed oxide (Zn/Al = 0.16) leads to more active NiMo catalyst due to formation of more Ni(Zn)–Mo–S active species as revealed by XRD and HRTEM.
Permanent Link: http://hdl.handle.net/11104/0311280