Enhanced low-temperature activity for CO2 methanation over Ru doped the Ni/CexZr(1−x)O2 catalysts prepared by one-pot hydrolysis method. (5th April 2018)

• Record Type: Journal Article
• Authors: Shang, Xingfu; Deng, Digu; Wang, Xueguang; Xuan, Weidong; Zou, Xiujing; Ding, Weizhong; Lu, Xionggang
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 14(2018)
• Page Start: 7179
• Page End: 7189
• Publication Date: 2018-04-05
• Subjects: CO2 methanation -- Nickel catalyst -- Ceria-zirconia -- Low-temperature activity -- One-pot hydrolysis method; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.02.059
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A series of 30 wt%Ni/Ce x Zr1− x O2 catalysts doped with Ru ranging from 0 to 5 wt% were prepared by one-pot hydrolysis of metal nitrates with ammonium carbonate for carbon dioxide methanation at low temperature range of 150–310 °C. The influences of Ce/Zr molar ratios and Ru contents on the physicochemical properties and catalytic activities of prepared catalysts were systematically investigated. The addition Ru can improve the Ni dispersion and the basicity of the y Ru-30Ni/Ce0.9 Zr0.1 O2 catalysts surface. As a result, their low-temperature catalytic activity had been enhanced over these doped Ru promoted catalysts. The optimal catalyst was 3Ru-30Ni/Ce0.9 Zr0.1 O2 on which the CO2 conversion reached theoretical equilibrium value as high as 98.2% with the methane selectivity of 100% at a reaction temperature as low as 230 °C. Moreover, there was almost no deactivation for the 3Ru-30Ni/Ce0.9 Zr0.1 O2 catalyst during 300 h at 230 °C indicating excellent catalytic stability and coke resistence ability. It was also found that the low-temperature activity of 3Ru-30Ni/Ce0.9 Zr0.1 O2 catalyst prepared by one-pot hydrolysis method was much higher than the one prepared by impregnation method. Highlights: A series of 30 wt%Ni/Cex Zr1−x O2 catalysts doped with Ru ranging from 0 to 5 wt% were prepared by one-pot hydrolysis method. Low-temperature catalytic activity of CO2 methanation had been enhanced over these Ru doped 30%Ni/Cex Zr1−x O2 catalysts. CO2 conversion of 3Ru-30Ni/Ce0.9 Zr0.1 O2 catalyst reached theoretical equilibrium value at low temperature of 230 °C. 3Ru-30Ni/Ce0.9 Zr0.1 O2 catalyst showed almost no deactivation up to 300 h in long term stability test.