Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-09-16 , DOI: 10.1016/j.jhazmat.2021.127222 Abid Farooq 1 , Jechan Lee 2 , Hocheol Song 3 , Chang Hyun Ko 4 , Im-Hack Lee 1 , Young-Min Kim 5 , Gwang Hoon Rhee 6 , Sumin Pyo 1 , Young-Kwon Park 1
This study proposes a method to valorize hazardous waste such as used COVID-19 face mask via catalytic gasification over Ni-loaded ZSM-5 type zeolites. The 25% Ni was found as an optimal loading on ZSM-5 in terms of H2 production. Among different zeolites (ZSM-5(30), ZSM-5(80), ZSM-5(280), mesoporous (m)-ZSM-5(30), and HY(30)), 25% Ni/m-ZSM-5(30) led to the highest H2 selectivity (45.04 vol%), most likely because of the highest Ni dispersion on the m-ZSM-5(30) surface, high porosity, and acid site density of the m-ZSM-5(30). The content of N-containing species (e.g., caprolactum and nitriles) in the gasification product was also reduced, when steam was used as gasifying agent, which is the source of potentially hazardous air pollutants (e.g., NOx). The increase in the SiO2/Al2O3 ratio resulted in lower tar conversion and lower H2 generation. At comparable conditions, steam gasification of the mask led to ~15 vol% higher H2 selectivity than air gasification. Overall, the Ni-loaded zeolite catalyst can not only suppress the formation of hazardous substances but also enhance the production of hydrogen from the hazardous waste material such as COVID-19 mask waste.
中文翻译:
危险的 COVID-19 掩盖废物的价值,同时使用催化气化最大限度地减少危险副产品
本研究提出了一种通过载镍 ZSM-5 型沸石催化气化对使用过的 COVID-19 口罩等危险废物进行评估的方法。就 H 2产量而言,发现 25% Ni 是 ZSM-5 上的最佳负载。在不同的沸石(ZSM-5(30)、ZSM-5(80)、ZSM-5(280)、介孔 (m)-ZSM-5(30) 和 HY(30))中,25% Ni/m- ZSM-5(30) 导致最高的 H 2选择性 (45.04 vol%),很可能是因为 m-ZSM-5(30) 表面上最高的 Ni 分散、高孔隙率和 m- ZSM-5(30)。含氮物种的含量(例如当使用蒸汽作为气化剂时,气化产物中的 、己内酰胺和腈)也减少了,而蒸汽是潜在有害空气污染物(例如,NO x)的来源。SiO 2 /Al 2 O 3比率的增加导致较低的焦油转化率和较低的H 2生成。在可比较的条件下,面罩的蒸汽气化导致 H 2选择性比空气气化高约 15 vol% 。总体而言,载镍沸石催化剂不仅可以抑制有害物质的形成,还可以提高从 COVID-19 口罩废物等危险废物中产生氢气的能力。