Effects of temperature and urea concentration on nitrogen-rich pyrolysis: Pyrolysis behavior and product distribution in bio-oil

Liu, Shanjian; Zhao, An; He, Zhisen; Li, Yongjun; Bi, Dongmei; Gao, Xin

doi:10.1016/j.energy.2021.122443

Cited by 19 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the modifying effect of nitrogen, the CO 2 adsorption and catalytic activities of nitrogen-doped biochar are greatly enhanced compared with biochar. The nitrogen-rich bio-oil is much more valuable due to its richness in nitrogen heterocyclic compounds. , Li et al reported the introduction of exogenous nitrogen (ammonium acetate, urea, ammonium sulfate, and ammonium dihydrogen phosphate) in a fixed-bed reactor for the pyrolysis of rice husk, which could convert carbonyl compounds in bio-oil into nitrogen-containing heterocyclic compounds and improve bio-oil stability. Meanwhile, the resulting nitrogen-doped biochar had high nitrogen content, adsorption activity, specific surface area, and excellent electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Proportions of Urea in Blend for Nitrogen-Rich Pyrolysis: Characteristics and Distribution of Bio-Oil and Biochar

Liu

Zhao

et al. 2022

ACS Omega

Self Cite

View full text Add to dashboard Cite

This study aimed to investigate the effect of the urea content on the characteristics and distribution of nitrogen-rich biooil and nitrogen-doped biochar. Cellulose, cellobiose, and glucose were used as feedstock. Urea was used as the exogenous nitrogen source in nitrogen-rich pyrolysis at 500 °C. The order of the nitrogen increase in the nitrogen-doped biochar was cellulose < cellobiose < glucose. Nitrogen-doped biochar consisted of abundant nitrogen and nitrogenous functional groups, and the stability of biochar was optimal. The nitrogen-doped biochar obtained from cellulose showed the optimal adsorption performance for diethyl phthalate with 50% urea addition. When the proportion of urea was 20%, the content of anhydro-sugars in biooil reached the maximum value (61.86%). Furans and other smallmolecule oxygenates were intermediates to produce nitrogenous heterocyclic compounds (NHCs) from cellulose. When the proportion of urea was 40%, the bio-oil had the highest selectivity (91.63%) of NHCs. The NHCs in the obtained bio-oil mainly consisted of pyrroles, pyrimidines, pyridines, imidazoles, and pyrazines. Therefore, the excellent proportion of urea in the blend could promote the generation of high-value NHCs and nitrogen-doped biochar from the nitrogen-rich pyrolysis of cellulose (and its model compounds).

show abstract

Section: Introductionmentioning

confidence: 99%