Superior Stability of Au/SiO 2 Compared to Au/TiO 2 Catalysts for the Selective Hydrogenation of Butadiene

Nazila Masoud (1) , Laurent Delannoy (2) , Herrick Schaink , Ad van Der Eerden , Jan Willem de Rijk , Tiago A. G. Silva , Dipanjan Banerjee (3) , Johannes D. Meeldijk , Krijn P. de Jong (1) , Catherine Louis (2) , Petra E. de Jongh (1)

1 Department of Inorganic Chemistry and Catalysis
2 LRS - Laboratoire de Réactivité de Surface
3 Institute of Resource Ecology [Dresden]

Supported gold nanoparticles are highly selective catalysts for a range of both liquid-phase and gas-phase hydrogenation reactions. However, little is known about their stability during gas-phase catalysis and the influence of the support thereon. We report on the activity, selectivity, and stability of 2-4 nm Au nanoparticulate catalysts, supported on either TiO2 or SiO2, for the hydrogenation of 0.3% butadiene in the presence of 30% propene. Direct comparison of the stability of the Au catalysts was possible as they were prepared via the same method but on different supports. At full conversion of butadiene, only 0.1% of the propene was converted for both supported catalysts, demonstrating their high selectivity. The TiO2-supported catalysts showed a steady loss of activity, which was recovered by heating in air. We demonstrated that the deactivation was not caused by significant metal particle growth or strong metal-support interaction, but rather, it is related to the deposition of carbonaceous species under reaction conditions. In contrast, all the SiO2-supported catalysts were highly stable, with very limited formation of carbonaceous deposits. It shows that SiO2-supported catalysts, despite their 2-3 times lower initial activities, clearly outperform TiO2-supported catalysts within a day of run time.

Mots clés: gold; supported nanoparticles; selective hydrogenation; butadiene; catalyst; stability

Domaines: Chimie

Nazila Masoud, Laurent Delannoy, Herrick Schaink, Ad van Der Eerden, Jan Willem de Rijk, et al.. Superior Stability of Au/SiO 2 Compared to Au/TiO 2 Catalysts for the Selective Hydrogenation of Butadiene. ACS Catalysis, 2017, 7 (9), pp.5594 - 5603. ⟨10.1021/acscatal.7b01424⟩. ⟨hal-01651990⟩