Journal
JOURNAL OF CO2 UTILIZATION
Volume 16, Issue -, Pages 236-244Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2016.07.010
Keywords
Nickel-zirconia catalysts; Combustion medium; Carbon dioxide; Methanation; Combustion method
Ask authors/readers for more resources
The 15 wt% Ni/ZrO2 catalyst was firstly synthesized using urea as the combustion medium, which shows high catalytic performance for CO2 methanation due to its high reducibility and Ni dispersion, small Ni particle size and excellent CO2 adsorption capacity. The CO2 conversion of Ni/ZrO2 prepared by the urea combustion method achieves 60% while the conversion of Ni/ZrO2 using n-propanol as the combustion medium is less than 13% at 300 degrees C, 0.1 MPa and a WHSV of 48,000 mL.g(-1).h(-1). A series of catalysts were synthesized using different combustion Mediums including ethanol, n-propanol, urea, glycol and glycerol. The prepared catalysts were characterized by BET, ICP-OES, XRD, H-2-TPR, H-2-TPD and CO2-TPD. The results illustrate that the combustion mediums significantly affect the catalytic pore structure, interaction between active metal and support, Ni dispersion, Ni particle size, the crystal structure of ZrO2 and CO2 adsorption capacity. In addition, the synergistic effect between nickel and mediums leads to a total phase transformation of zirconia from m-ZrO2 to t-ZrO2. The 15Ni/ZrO2 catalyst prepared by urea combustion method exhibits not only higher activity but also better stability due to its smaller Ni particle size and better resistance to carbon deposition than the one prepared by impregnation method. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available