Depolymerization of waste plastics with coal over metal-loaded silica-alumina catalysts
| Autor: | Larry L. Anderson, Jing Liang, W. Tuntawiroon, Weibing Ding |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
Extended X-ray absorption fine structure Depolymerization business.industry General Chemical Engineering Non-blocking I/O Energy Engineering and Power Technology Liquefaction Polyethylene Catalysis chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Organic chemistry Coal High-density polyethylene business |
| Zdroj: | Fuel Processing Technology. 49:49-63 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/s0378-3820(96)01024-7 |
| Popis: | Catalytic effects of various hydrogenation-hydrocracking catalysts on the coliquefaction of coal with high-density polyethylene (HDPE) and commingled plastic were systematically investigated under typical liquefaction conditions: 430°C, 2000 psig H2 for 1 h. Silica-alumina impregnated with Pt, Ni, Pd, or Fe showed higher catalytic activities for oil conversion than did metal-free catalysts. Apparently, the hydrogenation function was created on active metal sites while hydrocracking took place on active sites on silica-alumina. High total conversions were obtained even without a solvent added. Product analyses and characterization have assisted in the determination of reaction pathways and possible mechanisms. Ni K-edge extended X-ray absorption near-edge spectroscopy (EXANES) and extended X-ray fine structure spectroscopy (EXAFS) show that Ni is present as NiO with nanoscale particles. In this study, two-stage processing of coal with HDPE was also investigated. Very high total conversions (up to 92%) were obtained while using this technique. |
| Databáze: | OpenAIRE |
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