Catalytic in Organic Syntheses by Paul Nels Rylander

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By Paul Nels Rylander

"Contains the complaints of the ... convention on Catalysis in natural Syntheses.".

summary: "Contains the complaints of the ... convention on Catalysis in natural Syntheses."

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F o r most r e a c t i o n s where t h e p o r e s o f t h e c a t a l y s t a r e f i l l e d w i t h l i q u i d , temperature g r a d i e n t s i n s i d e the c a t a l y s t p a r t i c l e are n e g l i g i b l e . For t h i s c a s e , the e f f e c t i v e n e s s 41 GEORGE W. ROBERTS f a c t o r , n , i s a f u n c t i o n o f o n l y two d i m e n s i o n l e s s v a r i a b l e s , the r e a c t i o n o r d e r , n , and a d i m e n s i o n l e s s m o d u l u s , Φ, w h i c h i s defined by: •" V (—> P 4 D A,e " c ' C A,1 In t h i s equation, D A i s the e f f e c t i v e d i f f u s i v i t y o f R e a c t a n t A i n s i d e the p o r o u s S t r u c t u r e o f the c a t a l y s t , and V i s the vlre se.

C m . 3 ( 0 . 9 5 + 0 . 5 χ 0 . 7 8 ) . 0 c e n t i p o i s e s , or 0 . 0 1 g m . / c m . s e c . S i n c e the c o n c e n ­ t r a t i o n o f n i t r o b e n z e n e i n the l i q u i d i s r e l a t i v e l y s m a l l (^4 mole % ) , the d e n s i t y and v i s c o s i t y o f the l i q u i d w i l l be a s ­ sumed to be the same a s t h o s e o f p u r e e t h a n o l . 5 C o n s i d e r t h a t H2 i s the s p e c i e s b e i n g t r a n s p o r t e d . The d i f f u s i o n c o e f f i c i e n t o f H2 i n e t h a n o l (D/\) i s a b o u t 5 .

The s l o p e o f a p l o t b a s e d on E q u a t i o n 14 i s p r o p o r t i o n a l to t h e sum o f t h e r e s i s t a n c e s t o l i q u i d / s o l i d mass t r a n s p o r t and c h e m i c a l r e a c t i o n / p o r e d i f f u s i o n . However, t h e r e i s no o b v i o u s way a t p r e s e n t t o s e p a r a t e t h e s e two t e r m s . Even i f the i n t e r c e p t o f a p l o t o f l / - r A v e r s u s 1/W i s s u f f i c i e n t l y s m a l l , i t i s s t i l l n o t p o s s i b l e to d e t e r m i n e w h e t h e r l i q u i d / s o l i d mass t r a n s p o r t o r c h e m i c a l r e a c t i o n / p o r e d i f f u s i o n , o r some c o m b i ­ n a t i o n o f t h e t w o , c o n t r o l s the o v e r a l l r a t e .

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