Effect of catalysts on liquefaction of alkali lignin for production of aromatic phenolic monomer. (December 2019)

• Record Type: Journal Article
• Authors: Duan, Baorong; Wang, Qiyan; Zhao, Yuzhen; Li, Ning; Zhang, Sufang; Du, Yaqin
• Is Part Of: Biomass and bioenergy. Volume 131(2019)
• Publication Date: 2019-12
• Subjects: Liquefaction -- Lignin -- Catalyst -- Bio-oil -- Monomeric phenols; Biomass energy -- Periodicals; Biomass -- Periodicals; Energy-Generating Resources -- Periodicals; Bioénergie -- Périodiques; 333.9539
• DOI: 10.1016/j.biombioe.2019.105413
• Languages: English
• ISSNs: 0961-9534

Abstract

Abstract: Hydrothermal liquefaction (HTL) has emerged as a promising technology for producing fuels/chemicals. Lignin liquefaction was carried out with different temperature 250, 270, 290 and 310 °C in the presence of 50% ethanol-50% water (v/v) and a reaction time 30 min. The catalyst reaction with 10 wt% each catalyst of Pd/C, Fe/C, Co/C and Ni/C at 270 °C for 30 min reaction time was carried out. For non-catalytic reaction maximum bio-oil (68.2 wt%) was obtained at 270 °C while catalytic reaction with Co/C catalyst gave highest bio-oil (73.2 wt%). The obtained bio-oil has been analyzed with the help of GC-MS, FT-IR, NMR, GPC and CHNS. On the basis of GC-MS analysis, the main monomeric phenolic compounds produced were phenol, 2-methoxy-phenol, 4-ethyl-phenol, 2-methoxy-4-ethyl-phenol and 2, 6-dimethoxy-phenol, due to their high concentrations it was feasible to select these five monomeric phenols as target compounds. It was seen that compared to the non-catalytic liquefaction reaction, the catalytic (Pd/C, Co/C, Ni/C and Fe/C) liquefaction reaction promotes the hydrogenation and hydrogeoxygenation of bio-oils. The possible reaction pathways have been explored in this studied. Highlights: Catalytic liquefaction of alkali lignin was investigated. The maximum bio-oil yield (73.2 wt%) was obtained with Co/C catalyst. The specific monomeric phenols were obtained with Co/C catalytic liquefaction reaction. The higher (HHV) of the bio-oil (36.6 MJ -kg ) was achieved with Co/C catalyst.