Identification of superactive centers in thermally treated formamide-intercalated kaolinite
Frost, Ray L., Horvath, Erzsebet, Kristof, Janos, Jakab, Emma, Mako, Eva, & Vagvolgyi, Veronika (2005) Identification of superactive centers in thermally treated formamide-intercalated kaolinite. Journal of Colloid and Interface Science, 289(1), pp. 132-138.
The thermal behavior of a formamide-intercalated mechanochemically activated (dry-ground) kaolinite was investigated by thermogravimetry-mass spectrometry (TG-MS) and diffuse reflectance Fourier transform infrared spectroscopy (DRIFT). After the removal of adsorbed and intercalated formamide, a third type of bonded reagent was identified in the 230 - 350 degrees Celsius temperature range decomposing in situ to CO and NH3. The presence of formamide decomposition products as well as CO2 and various carbonates identified by DRIFT spectroscopy indicates the formation of super-active centers as a result of mechanochemical activation and heat treatment (thermal deintercalation). The structural variance of surface species decreases with the increase of grinding time. The ungrounded mineral contains a low amount of weakly acidic and basic centers. After 3 hours of grinding, the number of acidic centers increases significantly, while on further grinding the super-active centers show increased basicity. With the increase of grinding time and treatment temperature the amount of bicarbonate- and bidentate-type structures decreases in favor of the carboxylate- and monodentate.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|Item Type:||Journal Article|
|Keywords:||nanochemistry, nanotechnology, Kaolinite, intercalation, mechanochemical activation, thermogravimetry, mass spectrometry (TG, MS), diffuse reflectance Fourier transform infrared spectroscopy (DRIFT)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||13 Jul 2005 00:00|
|Last Modified:||29 Feb 2012 13:17|
Repository Staff Only: item control page