Bimetallic LaNi_1-xCo_xO₃ (x=0, 0.3, 0.5, 0.7, and 1) Perovskite Catalysts for Tar Reforming to Syngas

Abstract:

Perovskite-type oxide with transition metal as active site presented a promising potential catalyst for tar elimination in gasification process. LaNi_1-xCo_xO₃ (x= 0, 0.3, 0.5, 0.7, and 1) were prepared by sol-gel method. The XRD profiles of the calcined catalysts revealed the mixed metal oxide forms including LaNiO₃ and LaCoO₃ rhombohedral structures. Good dispersion of La, Ni, and Co with homogenous structure was observed in synthesized catalyst. The particle size and surface area were in the range of 12.64-21.86 μm and 3.89-11.69 m² /g, respectively. Activity of prepared catalysts on tar elimination was carried out using steam reforming of toluene as tar model compound at 500, 600, 700, and 800°C. Product distributions obtained from reforming reaction with LaNi_1-xCo_xO₃ were between 40.24-88.84% of gas, 10.99-59.59% of liquid, and 0.15-0.17% of solid. Conversion to CO and H₂ were found to increase with the reaction temperature. The maximum carbon and hydrogen conversion to syngas, CO and H₂, of approximately 78.42% and 83.49% with acceptable heating value were occurred at 800oC using LaNiO₃ as catalyst. Crystal structure of used catalysts clearly showed destruction of perovskite structure and transformation to metallic Ni and Co at effective temperature.

• Periodical: Advanced Materials Research (Volume 747)
• Pages: 690-693
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.747.690
• Online since: August 2013
• Authors: Chakrit Soongprasit, Duangdao Aht-Ong, Duangduen Atong
• Keywords: Catalyst, Hydrogen, Perovskite, Syngas, Tar Removal

References

[1] C. Wu, T.P. Williams, Effects of gasification temperature and catalyst ratio on hydrogen production from catalytic steam pyrolysis-gasification of polypropylene, Energy Fuels 22 (2008) 4125–4132.

DOI: 10.1021/ef800574w

[2] C. Lee, N. Tai, H. Sheu, H. Chiu, S. Hsieh, The formation of perovskite PbTiO3 powders by sol–gel process, Mater. Chem. Phys. 97 (2006) 468–471.

DOI: 10.1016/j.matchemphys.2005.08.048

[3] V.R. Choudhary, B.S. Uphade, A.A. Belhekar, Oxidative conversion of methane to syngas over LaNiO3 perovskite with or without simultaneous steam and CO2 reforming reactions: influence of partial substitution of La and Ni, J. Catal. 163 (1996).

DOI: 10.1006/jcat.1996.0332

[4] A. Louloudi, N. Papayannakos, Hydrogenation of benzene on Ni/Al-pillared montmorillonite catalysts, Appl. Catal. A, 204 (2000) 167–176.

DOI: 10.1016/s0926-860x(00)00516-0

[5] K. Soongprasit, Synthesis of La-based catalyst via sol-gel and microwave techniques for syngas production from thermochemical conversion of polymeric and biomass waste, Doctor of Philosophy Material Science Faculty of Science Chulalongkorn University, (2012).