Abstract
Sr-containing La1.0-Co0.5Ti0.5O3 as dual perovskite materials were investigated for the steam reforming of the toluene (SRT) reaction. The impact of Sr-doping on tolerance towards tar contaminants (chloride & H2S) for the SRT reaction was also studied. Overall, an optimum catalyst composition of La0.8Sr0.2-Co0.5Ti0.5O3 gave superior reforming activity than others. At 700 °C (S/C = 2), La0.8Sr0.2-Co0.5Ti0.5O3 exhibited ∼ 90 % of toluene conversion and stable for 21 h. La0.8Sr0.2-Co0.5Ti0.5O3 also displayed 80 % and 65 % of toluene conversion in the presence of 0.1 % and 1% of trichloroethylene (TCE) at 700 °C. XRD analysis revealed the formation of dual perovskite structures for calcined Sr doped La1.0-Co0.5Ti0.5O3 materials and negligible Co agglomeration during SRT reaction. TGA analysis revealed that the formation of carbon was insignificant during the SRT reaction at 700 °C. Finally, the superior catalytic performance of La0.8Sr0.2-Co0.5Ti0.5O3 catalyst over others is attributed to the availability of surface Co species (H2 chemisorption), mobile O2 species, and an optimum basic character.
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