Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 2. Catalytic hydrodeoxygenation reactions of lignin model compounds in organic and aqueous systems

Barton, R.R., Carrier, M., Segura, C., Garcia Fierro, J.L., Park, S., Lamb, H.H., Escalona, N. and Peretti, S.W. (2018). Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 2. Catalytic hydrodeoxygenation reactions of lignin model compounds in organic and aqueous systems. Applied Catalysis A: General, 562 , pp. 294-309.

Abstract

Nickel metal supported on HZSM-5 (zeolite) is a promising catalyst for lignin depolymerization. In this work, the ability of catalysts prepared via deposition-precipitation (DP) to perform hydrodeoxygenation (HDO) on two lignin model compounds in organic and aqueous solvents was evaluated; guaiacol in dodecane and 2-phenoxy-1-phenylethanol (PPE) in aqueous solutions. All Ni/HZSM-5 catalysts were capable of guaiacol HDO into cyclohexane at 523 K. The role of the HZSM-5 acid sites was confirmed by comparison with Ni/SiO2 (inert support) which exhibited incomplete deoxygenation of guaiacol due to the inability to perform the cyclohexanol dehydration step. The catalyst prepared with 15 wt% Ni, a DP time of 16 h, and a calcination temperature of 673 K (Ni(15)/HZSM-5 DP16_Cal673), performed the guaiacol conversion with the greatest selectivity towards HDO products, with an intrinsic rate ratio (HDO rate to conversion rate) of 0.31, and 90% selectivity to cyclohexane. Catalytic activity and selectivity of Ni/HZSM-5 (15 wt%) in aqueous environments (water and 0.1 M NaOH solution) was confirmed using PPE reactions at 523 K. After 30 min reaction time in water, Ni/HZSM-5 exhibited ~100% conversion of PPE, and good yield of the desired products; ethylbenzene and phenol (~35% and 23% of initial carbon, respectively). Ni/HZSM-5 in NaOH solution resulted in significantly higher ring saturation compared to the Ni/HZSM-5 in water or the NaOH solution control.

Publication DOI: https://doi.org/10.1016/j.apcata.2018.06.012
Divisions: Engineering & Applied Sciences
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Funding: National Institute of Food and Agriculture, U.S. Department of Agriculture, under Agreement No. 2010-38420-21828, the Project Basal PFB-27 of CONICYT, FONDECYT 1140528, and the Program PMI InEs UCO-1302 of the Chilean Ministry of Education.
Uncontrolled Keywords: hydrodeoxygenation; lignin; depolymerization; HZSM-5; deposition-precipitation
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Related URLs: https://linking ... 926860X18302886 (Publisher URL)
Published Online Date: 2018-07-25
Published Date: 2018-07-25
Authors: Barton, R.R.
Carrier, M. ( 0000-0003-4740-3416)
Segura, C.
Garcia Fierro, J.L.
Park, S.
Lamb, H.H.
Escalona, N.
Peretti, S.W.

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