Effect of precursor on the catalytic properties of Ni sub(2)P/SiO sub(2) in methyl palmitate hydrodeoxygenation

• Published in: RSC advances 2016-03, Vol.6 (36), p.30372-30383
• Main Authors: Shamanaev, Ivan V, Deliy, Irina V, Aleksandrov, Pavel V, Gerasimov, Evgeny Yu, Pakharukova, Vera P, Kodenev, Evgeny G, Ayupov, Artem B, Andreev, Andrey S, Lapina, Olga B, Bukhtiyarova, Galina A
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Emission analysis; Inductively coupled plasma; Nickel; Phosphates; Precursors; Reduction
• ISSN: 2046-2069
• DOI: 10.1039/c6ra01171c

The effect of phosphorus precursor on the physicochemical and catalytic properties of silica-supported nickel phosphide catalysts in the hydrodeoxygenation (HDO) of aliphatic model compound methyl palmitate (C sub(15)H sub(31)COOCH sub(3)) has been considered. Nickel acetate (Ni(OAc) sub(2)) and diammonium hydrogen phosphate ((NH sub(4)) sub(2)HPO sub(4)) (phosphate precursor) or nickel hydroxide (Ni(OH) sub(2)) and phosphorous acid (H sub(3)PO sub(3)) (phosphite precursor) have been used for the catalyst preparation by incipient wetness impregnation of SiO sub(2) with an aqueous solution of the precursors, followed by temperature-programmed reduction in hydrogen flow. Chemical analysis (ICP-AES), H sub(2)-TPR, NH sub(3)-TPD, super(31)P MAS NMR, XRD, and TEM have been employed for the characterization of the catalysts. The optimal reduction parameters of the silica-supported nickel phosphide catalysts have been found for the phosphate and phosphite precursors in terms of their activity in methyl palmitate HDO. The Ni sub(2)P/SiO sub(2) catalysts prepared by the phosphite method have shown higher catalytic activity in comparison with the Ni sub(2)P/SiO sub(2) catalysts prepared by the phosphate method. The activity has been shown to depend on the catalyst handling after reduction: in situ reduced catalysts demonstrate higher conversion of methyl palmitate than the samples exposed to the reduction, passivation and re-reduction steps.