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Exploratory Synthesis of Low-Silica Nanozeolites through Geopolymer Chemistry

机译:通过地缘聚合物化学探索低二氧化硅纳米氧化物的合成

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摘要

Nanozeolites are of great interest with the premise of their efficiency in traditional applications such as catalysis and separation, as well as their emerging applications including chemical sensors, medicine, and food industry. We report a new geopolymerization route for the synthesis of nanozeolites with different crystal structures by exploring the Na-Al-Si-H2O quaternary phase space under a mild hydrothermal condition. Nanostructured faujasite (FAU), cancrinite (CAN), and sodalite (SOD) zeolites with a crystallite size smaller than 40 nm were successfully produced from our exploration, as well as a submicron-sized Linde-Type A (LTA) zeolite. The transmission electron microscopy and nitrogen sorption analysis on representative zeolite samples showed that FAU and SOD zeolites exhibit textural mesopores, while CAN products have a more open aggregate structure. Our findings establish the geopolymerization as a convenient route for production of low-silica nanozeolites.
机译:纳米沸石对其在催化和分离等传统应用中的效率的前提,以及他们的新兴应用,包括化学传感器,医药和食品工业。 通过在温和的水热条件下探索Na-Al-Si-H2O季度相空间,通过探索Na-Al-Si-H2O季度空间来报告一种新的地质聚合物途径,用于合成具有不同晶体结构的不同晶体结构。 纳米结构的FAUJASITE(FAU),甲状霉素(CAN)和钠(SOD)沸石,具有小于40nm的微晶尺寸,从我们的勘探中成功地生产,以及亚微米型林德型A(LTA)沸石。 代表性沸石样品的透射电子显微镜和氮素吸附分析表明,FAU和SOD沸石表现出纹理中孔,而产品可以具有更开放的聚集体结构。 我们的调查结果将地缘聚合物制定为生产低二氧化硅纳米沸石的方便途径。

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