Influence of torrefaction with Mg-based additives on the pyrolysis of cotton stalk. (August 2018)

• Record Type: Journal Article
• Authors: Zeng, Kuo; Yang, Qing; Zhang, Yang; Mei, Yanyang; Wang, Xianhua; Yang, Haiping; Shao, Jingai; Li, Jiashuo; Chen, Hanping
• Is Part Of: Bioresource technology. Volume 261(2018)
• Page Start: 62
• Page End: 69
• Publication Date: 2018-08
• Subjects: Biomass -- Mg-based additive -- Torrefaction -- Pyrolysis -- H2 -- Aromatic hydrocarbon; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.03.094
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Mg-based additives strengthened deoxygenation and served as catalyst in pyrolysis. Torrefaction with Mg-based additives significantly increased aromatic hydrocarbons. A maximum aromatic hydrocarbons yield of 16.05% was obtained with MgO-K2 CO3 . The optimal torrefaction condition was: mass ratio 0.5:1 and temperature 320 °C. MgO-K2 CO3 increased H2 yield from 1.39 to 3.67 mmol/g with torrefaction severity. Abstract: The study presented an approach to introduce Mg-based additives into cotton stalk for strengthening deoxygenation effect during torrefaction. Then catalytic pyrolysis of torrefied feedstock with Mg-based additives residue as catalyst was performed at 550 °C for 10 min in a fixed-bed reactor. The effects of torrefaction temperature (200, 230, 260, 290, 320, 350 °C), type of Mg-based additive (MgO and MgO-K2 CO3 ), mass ratio of additive to biomass (0.5, 1 and 2) on pyrolysis were investigated. The results indicated that yields of bio-char and bio-oil significantly increased and decreased with torrefaction temperature rising to 350 °C. MgO inhibited pyrolysis bio-char yield increase with torrefaction severity. MgO-K2 CO3 increased H2 yield a lot from 1.39 to 3.67 mmol/g. It also effectively improved the aromatic hydrocarbons in bio-oil and the reduction of acids. A maximum aromatic hydrocarbons yield of 16.05% was obtained with MgO-K2 CO3 (the mass ratio of 0.5:1) at torrefaction temperature of 320 °C.