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Surface basicity and acidity of alkaline earth-promoted La2O3 catalysts and their performance in oxidative coupling of methane

✍ Scribed by Vasant R. Choudhary; Shafeek A. R. Mulla; Vilas H. Rane

Publisher: Wiley (John Wiley & Sons)
Year: 1998
Tongue: English
Weight: 198 KB
Volume: 72
Category: Article
ISSN: 0268-2575
DOI: 10.1002/(sici)1097-4660(199806)72:2<125::aid-jctb880>3.0.co;2-3

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✦ Synopsis

The catalytic activity and selectivity of and alkaline earth (viz. La 2 O 3 Mg, Ca, Sr and Ba) promoted (alkaline earth metal/La \ 0É1) catalysts in La 2 O 3 the oxidative coupling of methane (OCM) to (at 800¡C, C 2 -hydrocarbons ratio \ 4 or 8 and gas hourly space velocity \ 102 000 cm3 g~1 h~1) CH 4 /O 2 have been investigated. The acidity and basicity distributions on these catalysts are measured by the temperature programmed desorption (TPD) of and NH 3 from 50¡C to 950¡C, respectively. Both the acidity and basicity of the CO 2 catalysts and their activity in the OCM are strongly inÑuenced by the La 2 O 3 alkaline earth promoter and its concentration. Among the catalysts, Sr-promoted (Sr/La \ 0É1) is the most active and selective catalyst for the OCM La 2 O 3 process. This catalyst contains a larger number of strong basic sites and intermediate strength acid sites. 1998 SCI (

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