|Title||Superior Stability of Au/SiO2 Compared to Au/TiO2 Catalysts for the Selective Hydrogenation of Butadiene|
|Author(s)||Masoud, Nazila; Delannoy, Laurent; Schaink, Herrick; Eerden, Ad van der; Rijk, Jan Willem de; Silva, Tiago A.G.; Banerjee, Dipanjan; Meeldijk, Johannes D.; Jong, Krijn P. de; Louis, Catherine; Jongh, Petra E. de|
|Source||ACS Catalysis 7 (2017)9. - ISSN 2155-5435 - p. 5594 - 5603.|
|Publication type||Refereed Article in a scientific journal|
|Keyword(s)||butadiene - catalyst - gold - selective hydrogenation - stability - supported nanoparticles|
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. (Graph Presented).