Catalytic reactions of pyridine with carbon monoxide and water. Reduction of carbon monoxide to hydrocarbon. Applications of the water-gas shift reaction

1979 ◽  
Vol 44 (26) ◽  
pp. 4964-4966 ◽  
Author(s):  
Richard M. Laine ◽  
David W. Thomas ◽  
Lewis W. Cary

Two examples of catalysis by supported clusters are given that involve a molecular cluster frame during the catalytic cycle. (H)Os 3 (CO) 10 (OSi^) is able to hydrogenate ethylene between 343 and 373 K. The mechanism of this reaction, which involves the molecular cluster frame, requires the opening of the bridging three-electron oxygen ligand as the key step of the catalytic process. Rh 6 (CO) 16 adsorbed on alumina is a catalyst for the water-gas shift reaction carried out between 293 and 393 K. The mechanism of this reaction involves three steps: (i) electrophilic attack by surface protons on the metallic frame with formation of Rh I (CO) 2 and Rh III (H) (H) species; (ii) reductive elimination of H 2 favoured by CO coordination to the Rh III (H) (H) species; (iii) nucleophilic attack by molecular water on CO coordinated to Rh I with regeneration of the starting cluster, release of CO 2 and surface protons.


2014 ◽  
Vol 55 (3) ◽  
pp. 311-318 ◽  
Author(s):  
S. A. Nikolaev ◽  
E. V. Golubina ◽  
L. M. Kustov ◽  
A. L. Tarasov ◽  
O. P. Tkachenko

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