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A Novel One-Step Hydrothermal Preparation of Ru/SnxTi1-xO2 Diesel Oxidation Catalysts and its Low-Temperature Performance.


ABSTRACT: The rutile SnxTi1-xO2 (x = 0, 0.33, 0.5, 0.67, 1) solid solution was synthesized by a one-step hydrothermal method, in which tetrabutyl titanate and Tin (IV) chloride pentahydrate were used as raw materials. A series of Ru/SnxTi1-xO2 were then prepared by the impregnation process in RuCl3 to investigate the performance and stability of CO and C3H8 oxidation. These catalysts were characterized through XRD, N2 adsorption-desorption, FT-IR, TEM, XPS, H2-TPR, and O2-TPD techniques. The effect of Sn/Ti molar ratio and hydrothermal condition on the low-temperature catalytic oxidized performance and stability of Ru/SnxTi1-xO2 were investigated. The results indicated that Ru/Sn0.67Ti0.33O2 catalyst showed an excellent activity and stability at low temperatures. The CO conversion reached 50% at 180 °C and 90% at 240 °C. Besides, the C3H8 conversion reached 50% at 320 °C, the complete conversion of C3H8 realized at 500 °C, and no deactivation occurs after 12?h of catalytic reaction. The excellent low-temperature activity and stability of the Ru/Sn0.67Ti0.33O2 were attributed to the following factors. Firstly, XRD results showed that Sn4+ was successfully introduced into the lattice of TiO2 to replace Ti4+ forming a homogeneous solid solution (containing -Sn4+-O-Ti4+- species), which was consistent with TEM and N2 adsorption-desorption results. The introduction of Sn could suppress the growth of anatase crystal and promote the formation of rutile phase, and this phase transition was helpful to improve the low-temperature activity of the catalysts. Secondly, TEM images showed that ultrafine Ru nanoparticles (~ 5?nm) were dispersed on Sn0.67Ti0.33O2 support, suggesting that the formation of SnxTi1-xO2 solid solution was beneficial to the dispersion of Ru particles.

SUBMITTER: Fan L 

PROVIDER: S-EPMC7225244 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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A Novel One-Step Hydrothermal Preparation of Ru/Sn<sub>x</sub>Ti<sub>1-x</sub>O<sub>2</sub> Diesel Oxidation Catalysts and its Low-Temperature Performance.

Fan Li L   Sun Qi Q   Zheng Wei W   Tang Qinyuan Q   Zhang Ting T   Tian Mengkui M  

Nanoscale research letters 20200514 1


The rutile Sn<sub>x</sub>Ti<sub>1-x</sub>O<sub>2</sub> (x = 0, 0.33, 0.5, 0.67, 1) solid solution was synthesized by a one-step hydrothermal method, in which tetrabutyl titanate and Tin (IV) chloride pentahydrate were used as raw materials. A series of Ru/Sn<sub>x</sub>Ti<sub>1-x</sub>O<sub>2</sub> were then prepared by the impregnation process in RuCl<sub>3</sub> to investigate the performance and stability of CO and C<sub>3</sub>H<sub>8</sub> oxidation. These catalysts were characterized throu  ...[more]

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