Hydroreforming over Ni/H-beta of the thermal cracking products of LDPE, HDPE and PP for fuel production

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• 作者：J. M. Escola (1) josemaria.escola.saez@urjc.es
  J. Aguado (1)
  D. P. Serrano (23)
  L. Briones (1)
• 关键词：Hydroreforming – HDPE – LDPE – PP – Ni/h ; Beta
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2012
• 出版时间：October 2012
• 年：2012
• 卷：14
• 期：4
• 页码：286-293
• 全文大小：323.2 KB
• 参考文献：1. Association of Plastics Manufacturers in Europe (Plastics Europe), Plastics. The Facts, Brussels, 2011. http://www.plasticseurope.org
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  8. Serrano DP, Aguado J, Escola JM, Rodriguez JM, Peral A (2006) Hierarchical zeolites with enhanced textural and catalytic properties synthesized from organofunctionalized seeds. Chem Mater 18(10):2462–2464
  9. Escola JM, Aguado J, Serrano DP, García A, Peral A, Briones L, Calvo R, Fernández E (2011) Catalytic hydroreforming of the polyethylene thermal cracking oil over Ni supported hierarchical zeolites and mesostructured aluminosilicates. Appl Cat B 106:405–415
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• 作者单位：1. Department of Chemical and Environmental Technology, ESCET Rey Juan Carlos University, c/Tulipán s/n, 28933 Móstoles, Madrid, Spain2. Department of Chemical and Energy Technology, ESCET Rey Juan Carlos University, c/Tulipán s/n, 28933 Móstoles, Madrid, Spain3. IMDEA Energy Institute, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain
• ISSN：1611-8227

文摘

The thermal cracking at 400 °C of pure polyolefins—low density polyethylene (LDPE), high density polyethylene (HDPE) and polypropylene (PP) and a standard polyolefin mixture (46 % LDPE + 27 % HDPE + 28 % PP)—was studied together with the catalytic hydroreforming of the obtained oils over Ni/h-beta at 310 °C under 20 bar of hydrogen. The oils obtained after the thermal cracking of PP contain the highest amount of gasoline (58 %), while those coming from HDPE the lowest (39 %). The bromine index of the oils was very high, ranging from 54.1 (LDPE) to 83.8 (PP), indicating a high olefinic content of the oils. Additionally, the thermal cracking of the mixture indicates the occurrence of a synergestic effect among plastics, with transfer of methyl groups from PP to polyethylenes. Ni/h-beta (Si/Al = 25; Ni content = 6.2 wt%) catalyst was used in the hydroreforming since it contains a bimodal pore size distribution (0.6/3.1 nm), which improves accessibility of the oil molecules to the catalytic sites. After the hydroreforming and regardless of the plastics used, the share of lighter products (gasoline and gases) increases, reaching a remarkable 68 % of gasolines with the oils coming from PP. Regardless of the starting feed, the amount of useful fuels (gasoline + light diesel) was within 80–85 %. Additionally, the oils were successfully hydrogenated since the bromine indexes dropped below 7, indicating that more than 90 % of the starting olefins were saturated. The usage of catalysts increased the amount of aromatics in the obtained oils within 13–20 %, depending on the starting plastic. Likewise, the isoparaffin content of the gasolines was within 35–40 %, except for PP, where it was enhanced to 62 %. However, the research octane number (RON) of the gasolines from LDPE and PP and the cetane indexes of the diesel from all the plastics were promising for their application as fuels.