The catalytic isomerisation of cyclopropane over NaCoX zeolites using a pulsed Microreactor

✍ Scribed by F.R. Benn; J. Dwyer; A.A.A. Esfahani

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 373 KB
• Volume: 31
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)94985-5

✦ Synopsis

The catalytic isomerisation of cyloprane to propane was investigated over a series of NaCoX zeolites using a pulsed microreactor. First order kinetic parameters were calculated for the surface reaction from measured enthalpies of adsorption and apparent activation energies. Surface activation energies were not very dependent on the extent of ion exchange of Co(U) for Na(I) ions. Rates of reaction did not incretlse signifzantly with Co(II) concentration until after about 30% exchange. At levels of ion exchange greater than about 307% rates of reaction increased with cobalt concentration due to an increase in the number of active sites. In agreement with previous reports the active sites were presumed to be hydroxyl groups and the increase in rate at higher concentmtions of cobalt was attributed to dissociation of coordinated water molecules, during dehydration, to produce protons. Location of these protons on oxygens in the large cages provides the active sites.