| Enhancement of the CO(2) retention capacity of X zeolites by Na- and Cs-treatments. | |
| | |
MedLine Citation:
|
PMID: 17977576 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Adsorption of carbon dioxide on alkaline modified X zeolites was investigated by temperature programmed desorption (TPD) analysis of these materials previously saturated with CO(2) at 50, 100 and 200 degrees C. Parent X zeolite (in its sodium form) was treated with different sodium and cesium aqueous solutions, using both carbonates and hydroxides as precursors. The resulting materials were characterised by nitrogen physisorption, XRD, and NH(3)-TPD, in order to determine their morphological, crystallographic and chemical properties. Slight desilication phenomena were observed using hydroxides as precursors, whereas the treatment with Cs salts lead to higher crystallinity losses. Several successive adsorption-desorption cycles were carried out in order to check the regenerability of the adsorbents. Cesium-treated zeolites present higher carbon dioxide retention capacities than the sodium treated and than the parent material. When working with these Cs-modified materials, the desorption takes place mainly at temperatures between 250 and 400 degrees C, results of great practical interest, since it allows the use these kinds of materials for adsorption-desorption cycles. The evolution of the retention capacity with temperature is also markedly more positive for Cs-treated zeolite, especially when carbonate is used as the precursor. These materials maintain high retention capacities at 100 degrees C (10mg g(-1)) and even at 200 degrees C (3mg g(-1)), temperatures at which the most of the adsorbents are inactive. |
| | |
Authors:
|
Eva Díaz; Emilio Muñoz; Aurelio Vega; Salvador Ordóñez |
Related Documents
:
|
10968076 - Carbon monoxide poisoning from gas water heater installed and operated in the bathroom. 7990956 - Record of fluid-rock interactions on mars from the meteorite alh84001. 18623516 - Development of surface swabbing procedures for a cleaning validation program in a bioph... 17052726 - Competition between humic acid and carbonates for rare earth elements complexation. 20711636 - Ultra-porous titanium oxide scaffold with high compressive strength. 23383946 - Self-pinning by colloids confined at a contact line. |
Publication Detail:
|
Type: Journal Article Date: 2007-10-30 |
Journal Detail:
|
Title: Chemosphere Volume: 70 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2008 Feb |
Date Detail:
|
Created Date: 2008-01-15 Completed Date: 2008-04-14 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
|
Languages: eng Pagination: 1375-82 Citation Subset: IM |
Affiliation:
|
Department of Chemical Engineering and Environmental Technology, University of Oviedo, Julián Clavería s/n, 33006 Oviedo, Spain. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adsorption Carbon Dioxide / chemistry* Cesium / chemistry* Sodium / chemistry* Temperature X-Ray Diffraction Zeolites / chemistry* |
| Chemical | |
Reg. No./Substance:
|
124-38-9/Carbon Dioxide; 1318-02-1/Zeolites; 7440-23-5/Sodium; 7440-46-2/Cesium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Influence of resorcinol chemical oxidation on the removal of resulting organic carbon by activated c...
Next Document: Femoral/humeral strength in early African Homo erectus.