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By Alexis T., and L. Louis Hegedus, editors Bell

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G § Κ) 48 C A T A L Y S I S U N D E R T R A N S I E N T C O N D I T I O N S d e p e n d e n c e o f XPS s i g n a l s a t 5 2 9 . 8 , 0 ( a ) , and 5 3 2 . 0 eV, C0(a). T h e s e r e s u l t s , and o t h e r s l i k e t h e m , c a n be used t o compute the t i m e dependent c o v e r a g e s of b o t h CO and 0 f o r a v a r i e t y o f c o n d i t i o n s . From t h e s l o p e o f t h e o x y g e n c o v e r a g e v e r s u s t i m e , a CO2 r a t e c a n a l s o be c a l c u l a t e d .

Sci. 1978. 33, 1568. Conner, W. , and Bennett, C. O. Carbon monoxide oxidation on nickel oxide. J. Catal. 1976. 41, 30. Merrill, R. , and Sawin, H. H. Decomposition of hydrazine on Ir (111). This volume. Strozier, J. , Jr. c. puls­ ing technique. II. Experiment. Surface Sci. 1979. 87, 161. Strozier, J. , Jr. Cosgrove, G. , and Fischer, D. A. Oxidation of CO on Pt and Pd. I. Theory. Surface Sci. 1979. 82, 481. Cutlip, M. B. Concentration forcing of catalytic surface rate processes. E. J. 1979. 25 (3) 502.

5. After s t a b i l i z a t i o n a t 300K. t h e s a m p l e was h e a t e d r e s i s t i v e l y a t a r a t e o f 12KS"" w h i l e t h e CO2 p a r t i a l p r e s s u r e was m o n i t o r e d mass s p e c t r o m e t r i c a l l y . The CO2 signal, w h i c h i s a m e a s u r e o f t h e CO2 p r o d u c t i o n r a t e , i s s t r o n g l y p e a k e d on b o t h t h e h e a t i n g and c o o l i n g c y c l e s . S i n c e t h e m a x i m a b o t h o c c u r n e a r 573K, we e x p e c t t o f i n d maxima i n t h e s t e a d y - s t a t e CO2 p r o d u c t i o n r a t e s n e a r t h e same t e m p e r a t u r e q u a l i t a t i v e guide only d i f f e r e n c e s i n the r a t e s are the a m p l i t u d e , w h i c h i s h i g h e r d u r i n g c o o l - d o w n , and t h e p e a k t e m p e r a t u r e , w h i c h i s s l i g h t l y l o w e r d u r i n g c o o l down.

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