The (Z)/(E) ratio was analyzed for the 3-hexyne semi-hydrogenation at 275, 290 and 303 K. [RhCl(NH 2 (CH 2 ) 12 CH 3 ) 3 ] pure and supported on a carbonaceous material were used as catalysts. The supported complex showed high values of conversion and selectivity, and its behaviour was much better than the Lindlar catalyst used as a reference.

No abstract

Recebido em 02/11/2015; aceito em 16/01/2016; publicado na web em 15/04/2016The Wilkinson complex was tested as a catalyst in the partial hydrogenation of 1-heptyne, a medium chain alkyne, at a temperature of T = 303 K and hydrogen pressure PH 2 = 150 kPa. The tests were performed in homogeneous system as well as heterogeneous system, supporting the complex on i) γ-Al 2 O 3 and ii) a commercial carbonaceous material, RX3. Characterization by means of XPS and FTIR revealed that the anchored complex did not lose its chemical identity, being the catalytically active species. The Wilkinson complex on RX3 showed better conversions and selectivities, higher than the Lindlar catalyst, used as a reference. Additionally, it was proposed a method to recover Rh as a metal from the remaining solutions, and from it regenerate the complex to be reused from it.

GO was prepared from a natural graphite (Sigma Aldrich) according to Brodie´s method: 22 graphite (99.98wt %C) and NaClO 3 were mixed in a flask in an ice-bath. Fuming HNO 3 was then added drop wise. Another portion of acid was added after a time and the slurry was heated to 333K and kept for 8h. The heating rate (1.5Kmin -1