期刊
APPLIED CATALYSIS A-GENERAL
卷 562, 期 -, 页码 294-309出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2018.06.012
关键词
Hydrodeoxygenation; Lignin; Depolymerization; HZSM-5; Deposition-Precipitation
资金
- National Institute of Food and Agriculture, U.S. Department of Agriculture [2010-38420-21828]
- CONICYT [PFB-27, FONDECYT 1140528]
- Chilean Ministry of Education [UCO-1302]
- National Science Foundation [ECCS-1542015]
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 similar to 100% conversion of PPE, and good yield of the desired products; ethylbenzene and phenol (similar to 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.
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