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Hydrogen rich products from waste HDPE/LDPE/PP/PET over Me/Ni-ZSM-5 catalysts combined with dolomite
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2021-03-10 , DOI: 10.1016/j.joei.2021.03.004
Mohammed Al-asadi , Norbert Miskolczi

This work focuses on the pyrolysis-gasification of real waste polymers in one stage tubular reactor with and without catalyst at 550 °C and 850 °C. Moreover, the possibility for dry reforming by in situ CO2 generation was also investigated using dolomite. To enhance the syngas production from waste plastics, Ni/ZSM-5 catalyst was synthetized by wet impregnation with 4.82% of Ni, then the catalyst was loaded by further elements in ~2% concentration (Ca, Ce, La, Mg, and Mn). The composition of gases and liquid products was measured by gas-chromatography, while the coke deposition on the spent catalysts was followed by temperature-programmed oxidation. It was found that a large amount of amorphous carbons was produced at 550 °C with Ni/ZSM-5 catalyst. The in-situ addition of the carbon-dioxide can enhance the production of syngas because both the hydrogen and carbon-monoxide concentration can drastically increase. Furthermore, the carbon deposition on the catalyst surface can be reduced by using dolomite. Based on the results of the various Me/Ni/ZSM-5 catalysts, the Ce/Ni/ZSM-5 was the most promising catalyst for the production of syngas (122.6 mmol/g at 850 °C). While, Mg/Ni/ZSM-5 showed less effect on the decomposition reaction, as low syngas yield was produced (62.8 mmol/g at 850 °C). The maximum yield of pyrolysis oil was achieved at 550 °C for the process without the catalyst.



中文翻译:

Me / Ni-ZSM-5催化剂与白云石结合后,由HDPE / LDPE / PP / PET废料中的富氢产物

这项工作的重点是在有或没有催化剂的情况下,在550°C和850°C的条件下,在一级管式反应器中对实际废聚合物进行热解气化。而且,通过原位CO 2进行干重整的可能性还使用白云石研究了新生代。为了提高废塑料的合成气产量,将Ni / ZSM-5催化剂通过4.82%的Ni湿浸渍合成,然后以〜2%的浓度添加其他元素(Ca,Ce,La,Mg和Mn)。 )。通过气相色谱法测量气体和液体产物的组成,同时将焦炭沉积在用过的催化剂上,然后进行程序升温氧化。发现使用Ni / ZSM-5催化剂在550℃下产生大量无定形碳。由于氢气和一氧化碳的浓度都可以急剧增加,因此二氧化碳的就地添加可以提高合成气的产量。此外,通过使用白云石可以减少在催化剂表面上的碳沉积。根据各种Me / Ni / ZSM-5催化剂的结果,Ce / Ni / ZSM-5是生产合成气(在850°C下为122.6 mmol / g)最有希望的催化剂。同时,Mg / Ni / ZSM-5对分解反应的影响较小,因为产生的合成气产率较低(在850°C时为62.8 mmol / g)。在没有催化剂的情况下,该工艺在550°C时可获得最大的热解油收率。

更新日期:2021-03-30
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