TAP reactor investigation of methane coupling over samarium oxide catalysts

Statman, D.J. and Gleaves, J.T. and McNamara, D. and Mills, P.L. and Fornasari, G. and Ross, J.R.H. (1991) TAP reactor investigation of methane coupling over samarium oxide catalysts. Applied Catalysis, 77 (1). pp. 45-53. ISSN 0166-9834

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Abstract:	The adsorption and reaction characteristics of a Ba/Sr/Sm2O3 catalyst for methane coupling has been investigated using the TAP (Temporal Analysis of Products) reactor system. Pulsed adsorption experiments using methane, oxygen and krypton at temperatures ranging from 17°C to 800°C show that the transient response of methane is similar to that of Kr and is either not adsorbed, or weakly adsorbed on the catalyst. By contrast, oxygen is strongly adsorbed at temperatures above 500°C which suggests incorporation into the lattice with possible formation of surface anions. Pump-probe experiments in which methane and oxygen are introduced over the catalyst were also performed to investigate the effect of lifetimes of suspected surface intermediates on the relative yields of ethane and ethene. It is shown that the relative yields of both species increase with increasing values of the pulse valve time delay between introduction of the oxygen and methane. An explanation of these results using current knowledge and reasonable speculation of the mechanism is provided.
Item Type:	Article
Copyright:	© 1991 Elsevier Science
Link to this item:	http://purl.utwente.nl/publications/57543
Official URL:	http://dx.doi.org/10.1016/0166-9834(91)80022-O
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