Choudhary, Vasant R. ; Mulla, Shafeek A. R. ; Rane, Vilas H. (1998) Surface basicity and acidity of alkaline earth-promoted La2O3 catalysts and their performance in oxidative coupling of methane Journal of Chemical Technology & Biotechnology, 72 (2). pp. 125-130. ISSN 0268-2575
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Official URL: http://www3.interscience.wiley.com/journal/6100296...
Related URL: http://dx.doi.org/10.1002/(SICI)1097-4660(199806)72:2
Abstract
The catalytic activity and selectivity of La2O3 and alkaline earth (viz. Mg, Ca, Sr and Ba) promoted La2O3 (alkaline earth metal/La = 0.1) catalysts in the oxidative coupling of methane (OCM) to C2-hydrocarbons (at 800°C, CH4/O2 ratio = 4 or 8 and gas hourly space velocity = 102000 cm3 g-1 h-1) have been investigated. The acidity and basicity distributions on these catalysts are measured by the temperature programmed desorption (TPD) of NH3 and CO2 from 50°C to 950°C, respectively. Both the acidity and basicity of the La2O3 catalysts and their activity in the OCM are strongly influenced by the alkaline earth promoter and its concentration. Among the catalysts, Sr-promoted La2O3 (Sr/La = 0.1) is the most active and selective catalyst for the OCM process. This catalyst contains a larger number of strong basic sites and intermediate strength acid sites.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Society of Chemical Industry. |
| Keywords: | Oxidative Coupling of Methane; Mg-promoted La2O3; Ca-promoted La2O3; Sr-promoted La2O3; Ba-promoted LaO; Surface Acidity and Basicity |
| ID Code: | 10647 |
| Deposited On: | 04 Nov 2010 06:45 |
| Last Modified: | 28 May 2011 11:53 |
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