Chemistry of hydrogen sulphide under coal liquefaction conditions: 1. Modelling hydrogen transfer catalysis

✍ Scribed by Albert S. Hirschon; Karen Sundback; Richard M. Laine

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 420 KB
• Volume: 64
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(85)90008-0

✦ Synopsis

The work reported here represents initial attempts to develop a complete kinetic and mechanistic understanding of the reaction chemistry of H,S under coal liquefaction conditions, using both model systems and coal. Hydrogen sulphide was found to promotejcatalyse the transfer of hydrogen from tetralin to 2hydroxyquinoline (2-HOQ). The presence of H,S can increase the rate ofhydrogen transfer from tetralin to 2-HOQ by a factor of 10 compared with the same reaction run in the absence of H,S. The energy of activation for hydrogen transfer was found to decrease by x 5 kcal mol ' in the presence of H,S. The presence of H,S was also found to promote loss of oxygen from 2-HOQ to form small amounts of quinoline. No evidence of CX or C-N bond cleavage in 2-HOQ was noted under any of the reaction conditions studied. These results suggest that the presence of H,S reduces the temperatures necessary to promote effective hydrogen transfer from tetralin by 50P75°C. Moreover, they imply that similar effects occur in H,S-promoted coal liquefaction.