Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/14452
Title: Synthesis, characterization and catalytic properties of Cr-containing silica gel
Authors: Bai, Yongxiao
Hu, Weiwei
Hu, Xinjun
Bao, Yan
Zhu, Bochao
Yao, Peihong
Jia, Junji
Keywords: Silica gel
Cethyltriethylammonium bromide
Chromium nitrate nonahydrate
Framework
Coordination
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
Abstract: <span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-GB">Chromium-containing silica gel with variable Si/Cr ratios has been synthesized at ambient temperature by a sol-gel method<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" advp4df60e;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="" lang="EN-GB"> with the addition of different amounts of Cr precursor.<span style="font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-gb;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="" lang="EN-GB"> A combination of measurements is used to characterize the chromium-containing silica gel.<span style="font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:advp4df60e;mso-ansi-language:en-gb;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="" lang="EN-GB"> All the analysis indicates <span style="font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-gb;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="" lang="EN-GB">f<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" arial;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="" lang="EN-GB">ollowing this synthesis route,<span style="font-size: 11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> <span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" arial;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="" lang="EN-GB">it is possible to prepare materials<span style="font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-gb;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="" lang="EN-GB"> <span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" arial;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="" lang="EN-GB">without forming extra<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> <span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" arial;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="" lang="EN-GB">wall <span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-GB">Cr<sub>2</sub>O<sub>3</sub>. And the results show that polychromate is absent in the silica gel materials, while the Cr (VI) of calcined chromium-containing silica gel is present as a monochromate species. Also, it<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" timesnewromanpsmt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> <span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB">has<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" timesnewromanpsmt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> high activ<span style="font-size: 11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB">ity<span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" timesnewromanpsmt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> for the selective oxidation of styrene<span style="font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-gb;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="" lang="EN-GB">, which is analyzed periodically by means of gas chromatograph.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
Description: 209-214
URI: http://hdl.handle.net/123456789/14452
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.19(3) [June 2012]

Files in This Item:
File Description SizeFormat 
IJEMS 19(3) 209-214.pdf162.56 kBAdobe PDFView/Open


Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.