Effects of SiO2-doping on high-surface-area Ru-TiO2 catalysts for the selective CO methanation

Monday 01 Mar 21
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Aiming at a better understanding of the role of electronic / chemical modifications of the support on the performance of high specific surface area Ru/TiO2 catalysts in the selective CO methanation, we prepared and examined four different Ru/TiO2 catalysts with similar Ru loading and similar high specific surface area, but with the support doped with different amounts of Si (0–12 wt.% SiO2). 

Their activity for methane formation exhibits a volcano-shaped dependence on the SiO2 content, with a maximum between 4 and 8 wt.%. The CO adsorption properties showed distinct differences, with the weakest CO adsorption strength for the most active catalysts. Based on the results of a variety of different characterization techniques and pyrrole/pyridine adsorption measurements, the higher activity / lower CO adsorption strength cannot be explained by a single property, such as particle size, but must rather be caused by a complex combination of different effects.

Sebastian Cisneros, Shilong Chen, Thomas Diemant, Joachim Bansmann, Ali M.Abdel-Mageed, Michael Goepel, Sine E.Olesen, Eike S.Welter, Magdalena, Parlinska-Wojtan, Roger Gläser, Ib Chorkendorff, R. Jürgen Behma

Applied Catalysis B: Environmental. Volume 282, March 2021, 119483

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