Catalytic effect of K and Na with different anions on lignocellulosic biomass pyrolysis

doi:10.1007/s11705-024-2492-3

Front. Chem. Sci. Eng.

2024, Vol. 18

Issue (12) : 141 https://doi.org/10.1007/s11705-024-2492-3

Catalytic effect of K and Na with different anions on lignocellulosic biomass pyrolysis

Haiping Yang, Zhiqiang Chen, Yi Zhang, Biao Liu, Yang Yang, Ziyue Tang(

), Yingquan Chen, Hanping Chen

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

Alkali metals (AMs) play an important role in biomass pyrolysis, and it is important to explore their catalytic effects so to better utilize biomass pyrolysis. This study analyzed the catalytic influence of K and Na with different anions (Cl^–, SO₄^2–, and CO₃^2–) on biomass pyrolysis, and explored the influence on the pyrolytic mechanism. AM chlorides (NaCl and KCl), sulfates (Na₂SO₄ and K₂SO₄) and carbonates (Na₂CO₃ and K₂CO₃) were mixed with cellulose and bamboo feedstocks at a mass ratio of 20 wt %, in order to maximize their potential on in situ upgrading of the pyrolysis products. AM chlorides had little effect on the pyrolysis products, whereas sulfates slightly promoted the yields of char and gas, and had a positive effect on the composition of the gaseous and liquid products. Carbonates noticeably increased the yields of the char and gases, and improved the C content of the char. Besides, AM salt catalysis is an effective method for co-production of bio-oil and porous char.

Keywords alkali metal salt cellulose biomass catalytic pyrolysis

Corresponding Author(s): Ziyue Tang

Just Accepted Date: 19 June 2024 Issue Date: 02 September 2024

Cite this article:

Hanping Chen,Yingquan Chen,Ziyue Tang, et al. Catalytic effect of K and Na with different anions on lignocellulosic biomass pyrolysis[J]. Front. Chem. Sci. Eng., 2024, 18(12): 141.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2492-3
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I12/141

Fig.1 (a) Product distribution, (b) gas composition, and (c) the compositions of liquid products for cellulose pyrolysis with K₂CO₃ addition.

Fig.2 Product distribution for (a) cellulose and (b) bamboo pyrolysis with the addition of various AM salts.

Fig.3 Gas product characteristics for (a) cellulose and (b) bamboo pyrolysis with the addition of various AM salts.

Tab.1 Characteristics of gas and liquid products

Fig.4 Liquid product characteristics from cellulose pyrolysis with the addition of various AM salts.

Fig.5 (a) Liquid product characteristics and (b) the phenyl group composition from bamboo pyrolysis with the addition of various AM salts.

Fig.6 XRD analysis of char products from (a) cellulose and (b) bamboo pyrolysis, with variable alkali salts after water washing.

Fig.7 FTIR analysis of char products from (a) cellulose and (b) bamboo pyrolysis, with the addition of variable alkali salts after water washing.

Tab.2 Characteristics of char products

Fig.8 Effect paths map of AM salts during biomass pyrolysis.

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