Analyzing Promotion Effect of Rare Earth Species Located in Ce-HY on Polyethylene Upgrading
10.19756/j.issn.0253-3820.251036
- VernacularTitle:Ce-HY分子筛中稀土落位对聚乙烯降解促进作用的分析
- Author:
Xue-Ting WU
1
;
Jing XU
;
Xiao-Wei MU
;
Long TIAN
;
Xiao WANG
;
Shu-Yan SONG
;
Hong-Jie ZHANG
Author Information
1. 中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,长春 130022;中国科学技术大学应用化学与工程学院,合肥 230026
- Keywords:
Rare earth zeolites;
Location;
Polyethylene;
Plastic upcycling;
In situ-Raman
- From:
Chinese Journal of Analytical Chemistry
2025;53(5):794-803
- CountryChina
- Language:Chinese
-
Abstract:
The continuous accumulation of plastic waste such as polyethylene in the environment has caused serious environmental pollution issues.Considering the high similarity in the molecular structure of petroleum and polyolefin,it is feasible to apply rare earth-zeolite catalysts in polyolefin plastic upcycling,which is commonly used in fluid catalytic cracking(FCC)in the field of petroleum refining.In this study,Ce-modified HY(Ce-HY)zeolites were synthesized and characterized by a series of analytical methods,such as high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),Fourier infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),etc.When introducing 5% Ce species into HY zeolites,the 5Ce-HY showed excellent catalytic performance in the catalytic cracking of low-density polyethylene(LDPE),which achieved 98.4% LDPE conversion with 91.5% selectivity of gaseous alkanes at 300℃,and 75.4% of them were isoparaffins.In addition,the effect of the location of rare earth species in Y zeolites on the catalytic performance was explored by fine X-ray diffraction(XRD)in the range of 11°-13°and in situ-Raman analyses.The Ce species located in the supercage of Y zeolites were more important,which enhanced the adsorption capacity and accessibility of substrate molecules,thus facilitating the entire catalytic cracking process.This method could be used to detect the location of rare earth elements in Y zeolites to understand the mechanism of rare earth catalysis.
