Germanosilicate Precursors of ADORable Zeolites Obtained by Disassembly of ITH, ITR, and IWR Zeolites
Germanosilicate Precursors of ADORable Zeolites Obtained by Disassembly of ITH, ITR, and IWR Zeolites
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DOI：
10.1021/cm502953s
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发表时间：
2014-10-14
影响因子：
8.6
通讯作者：
Cejka, Jiri
中科院分区：
文献类型：
--
作者：
Shamzhy, Mariya;Opanasenko, Maksym;Cejka, Jiri
研究了含有水解不稳定层间Ge-O键的锗硅酸盐沸石ITH、ITR和IWR的结构转变，并且与酸处理条件（即，盐酸浓度、温度、持续时间）。在适当的酸处理条件下，ITH（Si/Ge = 2.5）、ITR（Si/Ge = 2.4）和IWR（Si/Ge = 6.9）分子筛都能发生分解。低浓度酸溶液（例如，0.01 MHCl）和低温有利于所研究的沸石的水解。母体沸石的化学组成强烈影响水解效率。对于具有足够分数（ca. 50%）的D4 R单元中的Ge（ITH和IWR的Si/Ge 6，
Structure transformation of germanosilicate zeolites ITH, ITR, and IWR containing hydrolytically unstable interlayer Ge-O bonds was investigated and is related to the conditions of acidic treatment (i.e., concentration of hydrochloric acid, temperature, duration). The disassembly of ITH (Si/Ge = 2.5), ITR (Si/Ge = 2.4), and IWR (Si/Ge = 6.9) zeolites under appropriate acidic treatment was demonstrated. Low-concentration acid solutions (e.g., 0.01 M HC1) and low temperatures favor the hydrolysis of the zeolites under study. The chemical composition of the parent zeolites strongly influences the efficiency of hydrolysis. For zeolites having sufficient fraction (ca. 50%) of Ge in D4R units (Si/Ge 6 for ITH and IWR, Si/Ge