The Formation of Metallic Silver in Silver-Form Zeolites
The Formation of Metallic Silver in Silver-Form Zeolites
复制标题
银型沸石中金属银的形成
DOI：
10.1246/bcsj.45.2332
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发表时间：
1972
影响因子：
4
通讯作者：
Hiroshi Takahashi
中科院分区：
文献类型：
--
作者：
K. Tsutsumi;Hiroshi Takahashi
用X射线衍射分析研究了银型沸石中银微晶的形成。银离子被还原到零价态，在本研究中，银离子在三种情况下聚集成金属--第一种是在600°C以上的氦气流中加热时，第二种是被氢还原时，最后一种是在300°C以上用烷基苯或醇处理时。Ag（31.6%）-Na-Y_（4.6）在上述三种情况下再还原时，得到的银晶粒尺寸分别为150-400、150-200和200- 300。如果银离子被还原，则沸石变为脱阳离子形式，其中分散有金属银。在沸石中形成的银金属与氧具有特殊的相互作用。
The formation of silver crystallites in silver-form zeolites was investigated, mainly by means of X-ray diffraction analysis. Silver ions were reduced to the zero-valent state; they aggregated to metals in three cases in this study—first, when silver-form zeolites were heated in a helium flow at above 600°C; secondly, when they were reduced by hydrogen, and lastly, when they were treated with the alkyl benzenes or alcohols above 300°C. The silver crystallites had sizes of 150–400, 150–200, and 200–300A respectively when Ag(31.6%)–Na–Y4.6 was rereduced in the three cases mentioned above. If the silver ions are reduced, the zeolite becomes decationated-form, in which metallic silver is dispersed. The silver metals formed in the zeolite have peculiar interactions with oxygen.