Format

Send to

Choose Destination
Sci Total Environ. 2018 Aug 1;631-632:1611-1622. doi: 10.1016/j.scitotenv.2018.03.147. Epub 2018 Mar 28.

Catalytic cracking of model compounds of bio-oil over HZSM-5 and the catalyst deactivation.

Author information

1
School of Science, Tibet University, Lhasa 850012, China; Tianjin Engineering Research Center of Bio Gas/Oil Technology, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Qingdao Institute for Ocean Engineering, Tianjin University, Qingdao 266235, China.
2
Tianjin Engineering Research Center of Bio Gas/Oil Technology, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
3
Tianjin Engineering Research Center of Bio Gas/Oil Technology, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China. Electronic address: mawc916@tju.edu.cn.
4
Qingdao Institute for Ocean Engineering, Tianjin University, Qingdao 266235, China.
5
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: tjwang@gdut.edu.cn.

Abstract

The catalytic cracking upgrading reactions over HZSM-5 of different model compounds of bio-oil have been studied with a self-designed fluid catalytic cracking (FCC) equipment. Typical bio-oil model compounds, such as acetic acid, guaiacol, n-heptane, acetol and ethyl acetate, were chosen to study the products distribution, reaction pathway and deactivation of catalysts. The results showed: C6-C8 aromatic hydrocarbons, C2-C4 olefins, C1-C5 alkanes, CO and CO2 were the main products, and the selectivity of olefins was: ethylene>propylene>butylene. Catalyst characterization methods, such as FI-IR, TG-TPO and Raman, were used to study the deactivation mechanism of catalysts. According to the catalyst characterization results, a catalyst deactivation mechanism was proposed as follows: Firstly, the precursor which consisted of a large number of long chain saturated aliphatic hydrocarbons and a small amount CC of aromatics formed on the catalyst surface. Then the active sites of catalysts had been covered, the coke type changed from thermal coke to catalytic coke and gradually blocked the channels of the molecular sieve, which accelerated the deactivation of catalyst.

KEYWORDS:

Bio-oil; Catalytic cracking; Deactivation mechanism; Model compounds; Reaction pathway

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center