The synthesis of MFI zeolite is explored through use of recycled aluminum (soda can tabs and aluminum foil) and silicon (crushed bottle glass) wastes, giving rise to highly crystalline ZSM-5. The effects of impurities from the wastes on crystallinity, particle morphology, surface area, and porosity are studied (electron microscopy, X-ray diffraction, N₂ isotherms at 77 K), and highly crystalline microporousmesoporous MFI structure resulted. t-plot and mesopore hysteresis trends showed that magnesium or chromium impurities in soda can tabs induce the formation of intracrystalline 2 nm sized supermicropores. Recycled aluminum transformed into pure aluminum hydroxide polymorphs (bayerite and gibbsite) for use with the synthesis gel. Glycerol is used as a green alternative to mineral base solutions to depolymerize powdered glass bottles to form the gel precursor to crystallization. The hydrothermal treatment of this gel with the aluminum foil dissolution, using tetra-propylammonium bromide (TPABr) as directing agent, formed a hierarchical ZSM-5 zeolite, in which ZSM-5 zeolite nanocrystals are supported on an amorphous silico-aluminate mesoporous material with a pore diameter centered at 4 nm. The upcycling of scrap Al and municipal glass to catalytic-grade ZSM-5 can potentially compete with existing processes and imparts positive social and environmental impacts.

中文翻译：

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城市玻璃和铝废料的升级回收用于合成分级 ZSM-5

MFI 沸石的合成是通过使用回收的铝（汽水罐标签和铝箔）和硅（碎瓶玻璃）废料来探索的，从而产生高度结晶的 ZSM-5。研究了废物中杂质对结晶度、颗粒形态、表面积和孔隙率的影响（电子显微镜、X 射线衍射、77 K 的 N ₂等温线），得到了高度结晶的微孔介孔 MFI 结构。吨图和中孔滞后趋势表明，苏打水中的镁或铬杂质可以诱导形成 2 nm 尺寸的晶内超微孔。回收的铝转化为纯氢氧化铝多晶型物（三羟铝石和三水铝石），用于合成凝胶。甘油被用作矿物碱溶液的绿色替代品，以解聚粉末状玻璃瓶，形成结晶的凝胶前体。使用四丙基溴化铵 (TPABr) 作为导向剂，通过铝箔溶解对该凝胶进行水热处理，形成了分级 ZSM-5 沸石，其中 ZSM-5 沸石纳米晶体负载在无定形硅铝酸盐介孔材料上孔径以 4 nm 为中心。