Pulse pyrolysis of waste cooking oil over CaO: Exploration of catalyst deactivation pathway based on feedstock characteristics

Qiuhao Wu; Linyao Ke; Yunpu Wang; Nan Zhou; Hui Li; Qi Yang; Jiamin Xu; Leilei Dai; Rongge Zou; Yuhuan Liu; Roger Ruan

doi:10.1016/j.apcatb.2021.120968

Pulse pyrolysis of waste cooking oil over CaO: Exploration of catalyst deactivation pathway based on feedstock characteristics

Qiuhao Wu, Linyao Ke, Yunpu Wang, Nan Zhou, Hui Li, Qi Yang, Jiamin Xu, Leilei Dai, Rongge Zou, Yuhuan Liu, Roger Ruan

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Pulse pyrolysis was carried out to realize real-time monitoring of CaO catalyst deactivation and regeneration in the catalytic pyrolysis of waste cooking oil (WCO) and free fatty acids (FFAs) based on the pyrolysis characteristics of feed stocks. The high unsaturation of the feedstock decreases the initial decomposition temperature and reduces the content of oxygen-containing compounds. CaO catalyst was completely deactivated after several times of pulse pyrolysis. During the pyrolysis of WCO, the catalytic activity of CaO did not recover after the pause of pulse pyrolysis. However, the catalytic activity all recovered during the pyrolysis of FFAs, but the rate of deactivation was accelerated. A large amount of Ca(OH)₂ and CaCO₃ were detected in the deactivated catalyst, and soluble coke was not detected. The research suggested that the change of crystal phases and agglomeration were the vital cause that impact the CaO catalyst stability.

Original language	English
Article number	120968
Journal	Applied Catalysis B: Environmental
Volume	304
DOIs	https://doi.org/10.1016/j.apcatb.2021.120968
State	Published - May 2022
Externally published	Yes

Funding

This project was financially supported by the National Natural Science Foundation of China (No. 21766019 ); (No. 21878137 ), The Centrally Guided Local Science Technology Special Project ( 20202ZDB01012 ), The Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province ( 20204BCJ23011 ), Graduate Student Innovation Project of Jiangxi Province ( YC2020-S005 ).

Keywords

CaO
Deactivation
Free fatty acid
Pulse pyrolysis
Waste cooking oil

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10.1016/j.apcatb.2021.120968

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title = "Pulse pyrolysis of waste cooking oil over CaO: Exploration of catalyst deactivation pathway based on feedstock characteristics",

abstract = "Pulse pyrolysis was carried out to realize real-time monitoring of CaO catalyst deactivation and regeneration in the catalytic pyrolysis of waste cooking oil (WCO) and free fatty acids (FFAs) based on the pyrolysis characteristics of feed stocks. The high unsaturation of the feedstock decreases the initial decomposition temperature and reduces the content of oxygen-containing compounds. CaO catalyst was completely deactivated after several times of pulse pyrolysis. During the pyrolysis of WCO, the catalytic activity of CaO did not recover after the pause of pulse pyrolysis. However, the catalytic activity all recovered during the pyrolysis of FFAs, but the rate of deactivation was accelerated. A large amount of Ca(OH)2 and CaCO3 were detected in the deactivated catalyst, and soluble coke was not detected. The research suggested that the change of crystal phases and agglomeration were the vital cause that impact the CaO catalyst stability.",

keywords = "CaO, Deactivation, Free fatty acid, Pulse pyrolysis, Waste cooking oil",

author = "Qiuhao Wu and Linyao Ke and Yunpu Wang and Nan Zhou and Hui Li and Qi Yang and Jiamin Xu and Leilei Dai and Rongge Zou and Yuhuan Liu and Roger Ruan",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = may,

doi = "10.1016/j.apcatb.2021.120968",

language = "English",

volume = "304",

journal = "Applied Catalysis B: Environmental",

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T1 - Pulse pyrolysis of waste cooking oil over CaO

T2 - Exploration of catalyst deactivation pathway based on feedstock characteristics

AU - Wu, Qiuhao

AU - Ke, Linyao

AU - Wang, Yunpu

AU - Zhou, Nan

AU - Li, Hui

AU - Yang, Qi

AU - Xu, Jiamin

AU - Dai, Leilei

AU - Zou, Rongge

AU - Liu, Yuhuan

AU - Ruan, Roger

PY - 2022/5

Y1 - 2022/5

N2 - Pulse pyrolysis was carried out to realize real-time monitoring of CaO catalyst deactivation and regeneration in the catalytic pyrolysis of waste cooking oil (WCO) and free fatty acids (FFAs) based on the pyrolysis characteristics of feed stocks. The high unsaturation of the feedstock decreases the initial decomposition temperature and reduces the content of oxygen-containing compounds. CaO catalyst was completely deactivated after several times of pulse pyrolysis. During the pyrolysis of WCO, the catalytic activity of CaO did not recover after the pause of pulse pyrolysis. However, the catalytic activity all recovered during the pyrolysis of FFAs, but the rate of deactivation was accelerated. A large amount of Ca(OH)2 and CaCO3 were detected in the deactivated catalyst, and soluble coke was not detected. The research suggested that the change of crystal phases and agglomeration were the vital cause that impact the CaO catalyst stability.

AB - Pulse pyrolysis was carried out to realize real-time monitoring of CaO catalyst deactivation and regeneration in the catalytic pyrolysis of waste cooking oil (WCO) and free fatty acids (FFAs) based on the pyrolysis characteristics of feed stocks. The high unsaturation of the feedstock decreases the initial decomposition temperature and reduces the content of oxygen-containing compounds. CaO catalyst was completely deactivated after several times of pulse pyrolysis. During the pyrolysis of WCO, the catalytic activity of CaO did not recover after the pause of pulse pyrolysis. However, the catalytic activity all recovered during the pyrolysis of FFAs, but the rate of deactivation was accelerated. A large amount of Ca(OH)2 and CaCO3 were detected in the deactivated catalyst, and soluble coke was not detected. The research suggested that the change of crystal phases and agglomeration were the vital cause that impact the CaO catalyst stability.

KW - CaO

KW - Deactivation

KW - Free fatty acid

KW - Pulse pyrolysis

KW - Waste cooking oil

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U2 - 10.1016/j.apcatb.2021.120968

DO - 10.1016/j.apcatb.2021.120968

M3 - Article

AN - SCOPUS:85120306822

SN - 0926-3373

VL - 304

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 120968

ER -

Pulse pyrolysis of waste cooking oil over CaO: Exploration of catalyst deactivation pathway based on feedstock characteristics

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