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標題: 利用 Ni-Fe 觸媒增加廢塑膠氣化產碳之效率
Enhancing carbon production by Ni-Fe catalyst during waste plastic gasification
作者: Chun-Wei Cheng
關鍵字: 廢塑膠;氣化;流體化床;觸媒;產碳;plastic wastes;gasification;fluidized bed reactor;catalysts;carbon production
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於流體化床添加不同觸媒對廢塑膠產碳之影響,結果顯示 Ni、Fe 活性相之觸媒皆能於反應中促使碳的合成。XRD 之結果顯示廢塑膠氣化反應後之觸媒,其主要之繞射峰(2θ=26.5°)為碳之特徵峰。其中以 Al2O3 為擔體之觸媒中,以 Fe/Al2O3 較有利合成碳,而改質石英砂之觸媒,則以Fe/SiO2 較有助於碳的合成,其含浸量又以 3 wt.%之 Fe/SiO2 為較佳,產碳量為 31.3 g/100g PP。此外,Ni/Al2O3 觸媒因具有較佳的分散性及較大的比表面積,較有助於產氫,當含浸量為 10 wt.%時,氣體組成約有 18 mole% (N2-free)的 H2。綜合本實驗之結果,本研究以含浸法製備之觸媒能催化廢塑膠氣化產碳,於床質中添加少量的 Fe 觸媒即能有效達到合成碳的效果。

With the development of society, people create a lot of plastic products for life convenience. In addition, plastics are not easily decomposed which resulted the problem of plastic wastes treatments. In order to reduce and recycle plastic wastes effectively, this study use bed-additives to catalyze the gasification of plastic wastes to form carbon materials in a fluidized bed reactor.

The efficiencies of plastic wastes gasification at 500°C with different bed- additives were evaluated. The results indicated that both Ni and Fe catalysts could enhance the ability of carbon production in the gasification system. The XRD results showed that the main diffraction peak (2θ=26.5°) of reacted catalyst was carbon. When using Al2O3 as support, Fe/Al2O3 had higher capacity for carbon production than Ni/Al2O3. For SiO2 catalysts, 3 wt.% Fe/SiO2 had the highest activity than other SiO2 catalysts in this study. Besides, Ni/Al2O3 significantly enhance hydrogen production ability due to better metal dispersion and higher specific surface area. In conclusion, adding small amount bed-additives which prepared by impregnation method could promote the ability of carbon production during plastic wastes gasification.
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