Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 1. Effect of nickel loading and preparation conditions on catalyst properties

• Published in: Applied catalysis. A, General Vol. 540; pp. 7 - 20
• Main Authors: Barton, R.R., Carrier, M., Segura, C., Fierro, J.L.G., Escalona, N., Peretti, S.W.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 25-06-2017; Elsevier Science SA; Elsevier
• Subjects: Carbon dioxide; Catalysis; Catalysts; Chemical precipitation; Chemical Sciences; Chemical synthesis; Chemisorption; Depolymerization; Deposition; Deposition-precipitation; Electron microscopy; Lignin; Nickel; Particle size; Properties (attributes); Reduction; Roasting; Transmission electron microscopy; X-ray diffraction; Zeolites; Deposition-precipitation; Lignin; Nickel; Zeolites
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2017.03.040

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•Effect of nickel loading on catalyst properties of Ni/HZSM-5 synthesized via excess deposition-precipitation times was studied.•Ni(15)/HZSM-5 with 16h DP time and calcined at 673K has desirable particle size and dispersion.•Ni/HZSM-5 prepared by this method has promising properties for hydrogenolysis.
Nickel metal supported on HZSM-5 (zeolite) is a promising catalyst for lignin depolymerization. In this work, Ni/HZSM-5 catalysts were synthesized via deposition-precipitation (DP) and characterized. The effect of synthesis parameters; including nickel loading, DP time (synthesis contact time), and calcination temperature, on catalyst properties were studied. N2 and CO2 adsorption techniques were used to look at textural properties and confirmed the existence of lamellar species generated from DP. X-ray diffraction (XRD) confirmed that nickel metal was present on the support after reduction and passivation of the catalyst. Temperature programmed reduction showed that all the catalyst preparations were reducible at 733K after 4h, and that the DP method formed a mixture of Ni2+ species on the support. Transmission electron microscopy, XRD, and H2 chemisorption were used to determine approximate particle size and dispersion of nickel metal. From all the preparations, the 15wt% Ni/HZSM-5 catalyst with long DP time (16h) and low calcination temperature (673K), exhibited the most favorable particle size (∼5nm) and dispersion (7%).