Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.



Direct cyanomethylation of aliphatic and aromatic hydrocarbons with acetonitrile over metal loaded titanium oxide photocatalyst

Abstract

Platinum-loaded TiO2 (Pt/TiO2) photocatalyst promoted cyanomethylation of aliphatic hydrocarbons, namely cyclohexane and cyclohexene, with acetonitrile, where the photogenerated hole oxidatively dissociates the C–H bond of both the acetonitrile and the aliphatic hydrocarbons to form each radical species before the radical cross-coupling of them. The Pt/TiO2 photocatalyst was more active than the Pd/TiO2 photocatalyst in these reactions. In contrast, the cyanomethylation of benzene was promoted by the Pd/TiO2 photocatalyst or a physical mixture of the Pt/TiO2 photocatalyst and a Pd catalyst supported by Al2O3, while it was hardly promoted by the Pt/TiO2 photocatalyst alone. The temperature dependence of the reaction rate proved that the Pd nanoparticles on the TiO2 photocatalyst function as a metal catalyst in the dark process. These results clearly suggest that the Pd metal catalyst is necessary for the cyanomethylation of benzene. However, in the cyanomethylation of aliphatic hydrocarbons, the catalytic effect by the metal particles was not observed, meaning that the radical coupling takes place without the metal catalysis. Thus, it is concluded that in the case of the benzene cyanomethylation the Pd nanoparticles play the dual roles, as the catalyst to catalyse the substitution reaction of benzene with the cyanomethyl radical, and as the electron receiver to reduce the recombination of the photoexcited electron and hole in the TiO2 photocatalyst, although they could not contribute as a catalyst to the cyanomethylation of aliphatic hydrocarbons.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 25 Feb 2017, accepted on 12 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7CY00365J
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
  •   Request permissions

    Direct cyanomethylation of aliphatic and aromatic hydrocarbons with acetonitrile over metal loaded titanium oxide photocatalyst

    E. Wada, T. Takeuchi, Y. Fujimura, A. Tyagi, T. Kato and H. Yoshida, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY00365J

Search articles by author