Catalytic pyrolysis of model compounds and waste cooking oil for production of light olefins over La/ZSM-5 catalysts

2016 International Conference on New Energy and Future Energy System

Li, F.W.^1 ; Ding, S.L.^1 ; Li, L.^1 ; Gao, C.^1 ; Zhong, Z.^1 ; Wang, S.X.^1 ; Li, Z.X.^1

School of Chemistry and Chemical Engineering, Guangxi University, Nanning, China^1

关键词: Catalytic pyrolysis;    Coked catalysts;    Fixed bed reactor;    High selectivity;    Liquid products;    Model compound;    Temperature programmed oxidation;    Waste cooking oil;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/40/1/012072/pdf
DOI  :  10.1088/1755-1315/40/1/012072

来源: IOP

【 摘 要 】

Waste cooking oil (WCO) and its model compounds (oleic acid and methyl laurate) are catalytically pyrolyzed in a fixed-bed reactor over La modified ZSM-5 catalysts (La/ZSM-5) aiming for production of C2-C4 light olefins. The LaO content in catalysts was set at 0, 2, 6, 10 and 14 wt%. The gas and liquid products are analyzed. The La/ZSM-5 catalyst with 6% LaO showed higher selectivity to light olefins when WCO and methyl laurate were pyrolyzed, and olefin content was 26% for WCO and 21% for methyl laurate. The catalyst with 10% LaO showed high selectivity to light olefins (28.5%) when oleic acid was pyrolyzed. The liquid products from WCO and model compounds mainly contain esters and aromatic hydrocarbons. More esters were observed in liquid products from methyl laurate and WCO pyrolysis, indicating that it is more difficult to pyrolyze esters and WCO than oleic acid. The coked catalysts were analyzed by temperature-programmed oxidation. The result shows that graphite is the main component of coke. The conversion of WCO to light olefins potentially provides an alternative and sustainable route for production of the key petrochemicals.