Promotion Effects of La₂O₃ on Ni/Al₂O₃ Catalysts for CO₂ Methanation

Abstract:

Ni/Al₂O₃ catalysts improved with different La contents were prepared by the conventional co-impregnation method and characterized by X-ray powder diffraction (XRD), N₂ adsorption-desorption, H₂ temperature-programmed reduction (H₂-TPR). Catalytic performances for CO₂ methanation under condition (CO₂/H₂=4.1:1, 1 atm) were discussed in detail. XRD result demonstrated that the addition of La was in favor of decreasing the Ni particle size and increasing the dispersion of Ni species. The H₂-TPR showed that La can change the proportion of various Ni species and increase the content of easily reducible Ni species. These results indicate that La species induce effect, resulting in smaller particle size and weaker interaction between active components and the support, higher dispersions, and reducibility of active phases, ultimately improving catalytic activity of CO₂ methanation.

• Periodical: Advanced Materials Research (Volume 1118)
• Pages: 205-210
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1118.205
• Online since: July 2015
• Authors: Wei Chang Chen, Wen Yang, Jian Dong Xing, Lei Liu, Hong Li Sun, Zhen Xin Xu, Shi Zhong Luo*, Wei Chu
• Keywords: Catalyst, CO₂ Methanation, Particle Size, Promoter

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