Journal of the Chemical Society - Faraday Transactions p. 3269 - 3274 (1995)
Update date:2022-08-17
Topics:
Jackson, S. David
Casey, Neil J.
The hydrogenation of propyne on a range of supported palladium catalysts has been investigated.The catalysts all showed 100percent selectivity to propene.A non-steady-state regime was observed when the catalysts were brought on line.During this period there was significant carbon laydown resulting in a surface Pd : C ratio of 1 : 3 with two of the catalysts tested.Once this level of laydown was reached, steady-state operation was achieved.In the steady state the amount of carbon laydown was reduced and activity was reproducible; the orders of reaction for propyne and dihydrogen were obtained.The order with respect to dihydrogen varied between 1.3 for the Pd/zirconia to 0.6 for the Pd/silica, while the order for propyne varied between 0.0 and 0.4.Analysis of the surface species by infrared spectroscopy revealed the presence of a horizontal and vertically bonded propyne, a di-sigma adsorbed propene and propylidyne.A mechanism for the reaction system has been postulated.
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