Details

Autor(en) / Beteiligte

• Chai, Shanshan
• Men, Yong
• Wang, Jinguo
• Liu, Shuang
• Song, Qiaoling
• An, Wei
• Kolb, Gunther

Titel

Boosting CO2 methanation activity on Ru/TiO2 catalysts by exposing (001) facets of anatase TiO2

Ist Teil von

• Journal of CO2 utilization, 2019-10, Vol.33, p.242-252

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ru deposited on TiO2 (001) facets exhibited a superior activity for CO2 methanation compared to TiO2 with exposed (101) facets, because TiO2 exposing (001) facets possesses high surface energy and abundant oxygen vacancies, which could provide more active sites for CO2 activation and result in a strong metal-support interaction with Ru. Moreover, Ru deposited over TiO2 (001) facets displayed an excellent durability for CO2 methanation. [Display omitted] •The type of TiO2 facets dictates the catalytic performance in CO2 methanation.•The superior activity of (001) facets originated from the enhanced CO2 adsorption due to abundant surface oxygen vacancies.•The size-dependence behavior of Ru nanoparticles and the role of CO on the reaction pathway were elucidated.•Ru deposited onto TiO2 nanocrystals displayed excellent durability for CO2 methanation. Catalytic reduction of CO2 to methane has been recognized as one of the most important strategic reactions to produce highly valuable chemicals and for storage of renewable energy (power-to-gas). This study demonstrates a crystal facet-dependent catalytic reduction of CO2 to CH4 on ruthenium nanoparticles deposited over TiO2 nanocrystal with exposed (001) and (101) facets. Compared with TiO2 (101) nanocrystal with the same Ru loading, Ru nanoparticles supported by TiO2 (001) exhibited a highly enhanced CO2 conversion rate and significantly improved methanation reactivity, along with a considerable durability. The physicochemical properties of the samples were characterized by HR-TEM, XRD, BET, FT-IR, UV–vis, Raman, ICP, and temperature-programmed reaction with CO2, and CO2 + H2. In view of the difference in catalytic activity and the physicochemical properties of the supported Ru/TiO2 catalysts, the results uncovered that the nature of the catalyst support of Ru/TiO2 strongly affected the dispersion of Ru species and the synergistic effect between Ru and underlying TiO2 supporting materials due to the strong metal-support interaction, and thus affected their capability to activate CO2 and determined the catalytic activity for CO2 methanation. Our work demonstrated the important role of the exposed crystal facets of the underlying support and the resulting Ru particle which had a large effect on CO2 methanation.