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Comparative study of natural and synthetic clinoptilolites containing silver in different states

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Title: Comparative study of natural and synthetic clinoptilolites containing silver in different states
Authors: Concepción-Rosabal, B.1 beatriz@fisica.uh.cu, Rodríguez-Fuentes, G.1, Bogdanchikova, N.2, Bosch, P.3, Avalos, M.2, Lara, V.H.4
Source: Microporous & Mesoporous Materials. Nov2005, Vol. 86 Issue 1-3, p249-255. 7p.
Subjects: Zeolites, Spectrum analysis, Sedimentary rocks, Cations
Abstract: Abstract: Clinoptilolite is a widely used natural zeolite due to its abundance in nature. The present work discusses the characteristics of silver modified clinoptilolites (natural and synthetic) containing silver in different states. The results obtained by the combined use of XRD, UV–Visible spectroscopy, and SAXS are described. These analyses were carried out to determine the features of silver in the zeolitic structure (natural and synthetic) and the particle size distribution of the Ag conglomerates produced in the reduced samples. The crystalline structure of the Ag-synthetic clinoptilolite was not affected by the thermal reduction of Ag; however, the Ag-natural clinoptilolite samples were less thermally stable. In synthetic and natural clinoptilolites after reduction at 100°C, small clusters (radius of <0.5nm) located inside the channels along with metal particles (with radius <7nm) on the external surface were observed. In Ag-natural clinoptilolite reduced at 100°C, along with the small and clusters stabilized inside clinoptilolite pores, large and clusters can be formed inside large mordenite channels or in the interstitial spaces of the particles that compose this mineral. Reduction at 400°C leads to disappearance of silver clusters and large particle formation. In both supports the particles cannot be located in the zeolite cavities, which are much smaller. [Copyright &y& Elsevier]
Copyright of Microporous & Mesoporous Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Concepci&#243;n-Rosabal%2C+B%2E%22&quot;&gt;Concepci&#243;n-Rosabal, B.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;i&gt; beatriz@fisica.uh.cu&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Rodr&#237;guez-Fuentes%2C+G%2E%22&quot;&gt;Rodr&#237;guez-Fuentes, G.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Bogdanchikova%2C+N%2E%22&quot;&gt;Bogdanchikova, N.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Bosch%2C+P%2E%22&quot;&gt;Bosch, P.&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Avalos%2C+M%2E%22&quot;&gt;Avalos, M.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lara%2C+V%2EH%2E%22&quot;&gt;Lara, V.H.&lt;/searchLink&gt;&lt;relatesTo&gt;4&lt;/relatesTo&gt;
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  Data: Abstract: Clinoptilolite is a widely used natural zeolite due to its abundance in nature. The present work discusses the characteristics of silver modified clinoptilolites (natural and synthetic) containing silver in different states. The results obtained by the combined use of XRD, UV–Visible spectroscopy, and SAXS are described. These analyses were carried out to determine the features of silver in the zeolitic structure (natural and synthetic) and the particle size distribution of the Ag conglomerates produced in the reduced samples. The crystalline structure of the Ag-synthetic clinoptilolite was not affected by the thermal reduction of Ag; however, the Ag-natural clinoptilolite samples were less thermally stable. In synthetic and natural clinoptilolites after reduction at 100&#176;C, small clusters (radius of &lt;0.5nm) located inside the channels along with metal particles (with radius &lt;7nm) on the external surface were observed. In Ag-natural clinoptilolite reduced at 100&#176;C, along with the small and clusters stabilized inside clinoptilolite pores, large and clusters can be formed inside large mordenite channels or in the interstitial spaces of the particles that compose this mineral. Reduction at 400&#176;C leads to disappearance of silver clusters and large particle formation. In both supports the particles cannot be located in the zeolite cavities, which are much smaller. [Copyright &amp;y&amp; Elsevier]
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  Data: &lt;i&gt;Copyright of Microporous &amp; Mesoporous Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.micromeso.2005.07.027
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 249
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        Type: general
      – SubjectFull: Spectrum analysis
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      – SubjectFull: Sedimentary rocks
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      – SubjectFull: Cations
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      – TitleFull: Comparative study of natural and synthetic clinoptilolites containing silver in different states
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              Text: Nov2005
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              Y: 2005
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