Abstract
The nature of surface hydroxyl groups formed by reduction of NiNaY zeolite, and behavior of adsorbed thiophene on reduced NiNaY (Ni/HNaY) were investigated by means of infrared spectroscopy. The newly formed surface hydroxyl groups on Ni/HNaY were more stable to thermal treatment than those originally existed on NiNaY. Those surface hydroxyl groups formed on Ni/HNaY showed Bronsted acidity in the i.r. spectra of pyridine adsorbed on Ni/HNaY. The strong interaction between surface acidic hydroxyl groups and adsorbed thiophene, and the formation of surface species having a C=S double bond were observed in the i.r. spectra of thiophene adsorbed on Ni/HNaY. It was concluded that the presence of Bronsted acid sites on Ni/HNaY surface is important for adsorption of thiophene and cleavage of the C-S bond of adsorbed thiophene. In the light of catalyst active sites, the reaction mechanism for hydrodesulfurization of thiophene over Ni/HNaY zeolite catalyst was proposed.
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