These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Effect of ZnCl2-activated biochar on catalytic pyrolysis of mixed waste plastics for producing aromatic-enriched oil. Author: Sun K, Huang Q, Chi Y, Yan J. Journal: Waste Manag; 2018 Nov; 81():128-137. PubMed ID: 30527029. Abstract: ZnCl2-activated biochar produced by one-step (impregnated by a 40% ZnCl2 solution, defined as Zn/C-I) and two-step (impregnated by a 40% ZnCl2 solution and microemulsion, defined as Zn/C-II and Zn/C-III, respectively) methods was used to catalyze the pyrolysis of mixed waste plastics (polyethylene, polyethylene, and polystyrene) to comparatively study their catalytic effect on aromatic-enriched oil production. The catalytic mechanism was discussed. The results show that ZnCl2-activated biochar showed high catalytic selectivity to aromatics during the pyrolysis of plastics at 500 °C, and the content of aromatics was increased to 47.5, 46.8, and 42.4% when respectively catalyzed by Zn/C-I, Zn/C-II, and Zn/C-III. Two-ring aromatics were significantly enriched, which accounted for 90.7, 73.1, and 87.7% of the aromatics in Zn/C-I, Zn/C-II, and Zn/C-III catalytic pyrolysis oils. 1,3-Diphenylpropane was the major component of the oils, and its proportion was 19.4, 11.5, and 15.9% in Zn/C-I, Zn/C-II, and Zn/C-III catalytic pyrolysis oils, respectively. The introduced Zn species could increase the surface acidity by forming Lewis acid sites (Zn-L), which increased aromatic yields by promoting the Diels-Alder reaction, hydrogen transfer, and dehydrogenation processes. Zn-L also promoted the condensation reaction of aromatics. Compared with Zn/C-I, Zn/C-III treated by ZnCl2 microemulsion could reduce 41.8% of coke on the catalysts owing to its larger pore size, while maintaining a relatively high oil quality.[Abstract] [Full Text] [Related] [New Search]