Understanding the Anion-Templated, OSDA-Free, Interzeolite Conversion Synthesis of High Silica Zeolite ZK-5.

Understanding the Anion-Templated, OSDA-Free, Interzeolite Conversion Synthesis of High Silica Zeolite ZK-5.
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DOI:
10.1002/chem.202201689
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发表时间:
2022-10-07
影响因子:
4.3
通讯作者:
Wright, Paul A.
Wright, Paul A.
中科院分区:
化学2区
文献类型:
--
作者:
Lozinska, Magdalena M.;Bruce, Elliott L.;Mattock, James;Chitac, Ruxandra G.;Cox, Paul A.;Turrina, Alessandro;Wright, Paul A.

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高硅沸石ZK-5(骨架Si/Al=4.8)已经通过使用碱金属阳离子和硝酸根阴离子但不使用有机结构导向剂的共模板路线由超稳定沸石Y通过沸石间转化制备。该机制涉及沸石骨架-碱金属阳离子-硝酸根阴离子有序化,已通过化学和热分析、拉曼光谱、计算建模和X射线粉末衍射的组合建立。铵交换得到具有吸留的硝酸铵的ZK-5,随后加热得到微孔沸石ZK-5。 使用无机阳离子和阴离子作为模板,通过沸石间转化制备高二氧化硅形式的沸石ZK-5。K+和Cs+阳离子和NO3 −阴离子在其lta和pau笼中自组装,具有高度的空间填充和与NH 4+的交换,然后加热得到微孔固体。这种方法提供了一种替代的和无有机结构导向剂的路线来指导沸石合成。
High silica zeolite ZK‐5 (framework Si/Al=4.8) has been prepared by interzeolite conversion from ultrastable zeolite Y via a co‐templating route using alkali metal cations and nitrate anions but without organic structure directing agents. The mechanism, which involves zeolite framework – alkali metal cation – nitrate anion ordering, has been established by a combination of chemical and thermal analyses, Raman spectroscopy, computational modelling, and X‐ray powder diffraction. Ammonium exchange gives ZK‐5 with occluded ammonium nitrate and subsequent heating gives microporous zeolite ZK‐5. High silica forms of the zeolite ZK‐5 are prepared by an interzeolite conversion using inorganic cations and anions as templates. K+ and Cs+ cations and NO3 − anions self‐assemble within its lta and pau cages with a high degree of space filling and exchange with NH4 + followed by heating gives a microporous solid. This approach offers an alternative and organic structure directing agent‐free route to directing zeolite synthesis.
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