Catalytic conversion of rubber wastes to produce aromatic hydrocarbons over USY zeolites [electronic resource] : Effect of SiO₂/Al₂O₃ mole ratio

• Ngôn ngữ: eng
• Ký hiệu phân loại: 666.9 Masonry adhesives
• Thông tin xuất bản: Oak Ridge, Tenn. : Oak Ridge, Tenn. : Oak Ridge National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2019
• Mô tả vật lý: Size: Article No. 111857 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 256168
• Chủ đề: 1. 30 direct energy conversion; 2. Aromatic hydrocarbons; 3. Catalytic fast pyrolysis; 4. Rubber wastes; 5. Sio2al2o3 mole ratio; 6. Usy zeolites

Tóm tắt

 Catalytic conversion of rubber wastes to produce an alternative fuel resource is a promising approach to dispose of solid wastes and address environmental issues. In this study, catalytic fast pyrolysis (CFP) of rubber wastes over acidic zeolites was conducted, and the effect of SiO<
 sub>
 2<
 /sub>
 /Al<
 sub>
 2<
 /sub>
 O<
 sub>
 3<
 /sub>
  mole ratio of USY zeolites on the formation of aromatic hydrocarbons was explored. Experimental results indicated that alkenes and aromatic hydrocarbons were the main pyrolytic products obtained from fast pyrolysis of rubber wastes, and the pyrolysis temperature played a vital role in the formation of aromatics with the highest concentration achieved at 750 �C. Furthermore, catalyst types also affected the catalytic degradation of rubber wastes since limonene was completely decomposed in the presence of zeolites. Compared to SAPO-34, zeolites with higher external surface area, stronger Br�nsted acid sites, and larger pore size, including USY, HY, and H?, were more effective in the production of aromatic hydrocarbons with the highest content obtained from USY catalyzed run. Given the observed effect of SiO<
 sub>
 2<
 /sub>
 /Al<
 sub>
 2<
 /sub>
 O<
 sub>
 3<
 /sub>
  mole ratio of USY zeolites on the formation of aromatic hydrocarbons during the CFP of rubber wastes, USY with low SiO<
 sub>
 2<
 /sub>
 /Al<
 sub>
 2<
 /sub>
 O<
 sub>
 3<
 /sub>
  ratio of 5.3 was more beneficial to the generation of aromatic hydrocarbons, while that with higher SiO<
 sub>
 2<
 /sub>
 /Al<
 sub>
 2<
 /sub>
 O<
 sub>
 3<
 /sub>
  mole ratio (11.5) facilitated the formation of alkenes. Simultaneously, the product distribution of aromatic hydrocarbons obtained from CFP of rubber wastes over USY zeolites was dominated by xylenes, alkylbenzenes, and toluene, and USY with SiO<
 sub>
 2<
 /sub>
 /Al<
 sub>
 2<
 /sub>
 O<
 sub>
 3<
 /sub>
  mole ratio of 5.3 was more active in the production of toluene and xylenes.