Catalytic Tar Removal on Nickel loaded Perovskites

2016-04-20
Çağlar, Başar
Tabari, Taymaz
Üner, Deniz
Dry reforming of tar compounds has been studied on Ni loaded perovskites to gain insight into conversion of tar compounds (produced by biomass gasification) into synthesis gas. Nickel is a highly active hydrocarbon decomposition and water-gas shift (WGS) catalyst suffering from coke deposition and sintering. Perovskite materials (e.g. LaCoO3 and LaFeO3 ) are used to compensate the problems related to stability of nickel catalyst by sintering and coke formation. Perovskites exhibit high thermal stability, high oxygen storage/release capacity and high tar removal activity [1-3]. For this study, we choose benzene as a model compound for tars. We have investigated dry reforming of benzene on Ni/LaCoO3 at various Ni loadings, CO2 to benzene ratios and temperatures. The conventional Ni/Al2 O3 catalyst was also used as a reference material to determine the relative activity of Ni/LaCoO3 . Several techniques were used to characterize catalyst materials: XRD to determine crystal structure, BET to determine surface area, pore structure and volume of catalysts, Temperature Programmed Reduction (TPR) to determine the reducibility of materials, XPS to detect the oxidation state and chemical composition of the catalyst surface, TGA to determine the amount of carbon deposited after reaction. We found that the reducibility of Ni/LaCoO3 catalyst is 4 times higher than that of Ni/Al2 O3 catalyst and the surface concentration of nickel is 4 times more on Ni/LaCoO3 catalyst than that on Ni/Al2 O3 catalyst. Due to its high surface nickel concentration and reducibility, Ni/LaCoO3 catalyst shows two times higher benzene conversion and H2 yield and less carbon formation than than the conventional Ni/Al2 O3 catalyst.

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Citation Formats
B. Çağlar, T. Tabari, and D. Üner, “Catalytic Tar Removal on Nickel loaded Perovskites,” presented at the 6th National Catalysis Conference (27 - 30 Nisan 2016), Bursa, Türkiye, 2016, Accessed: 00, 2021. [Online]. Available: http://ncc6.btu.edu.tr/index.php?sid=6680.