Methanol steam reforming on LaCo&lt;SUB&gt;1−&lt;/SUB&gt;&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;&lt;SUB&gt;−&lt;/SUB&gt;&lt;I&gt;&lt;SUB&gt;y&lt;/SUB&gt;&lt;/I&gt;Pd&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;Zn&lt;I&gt;&lt;SUB&gt;y&lt;/SUB&gt;&lt;/I&gt;O&lt;SUB&gt;3±&lt;/SUB&gt;&lt;I&gt;&lt;SUB&gt;δ&lt;/SUB&gt;&lt;/I&gt;

Kuc, Jagoda; Matam, Santhosh Kumar; Neumann, Matthias; Yoon, Songhak; Thiel, Philipp; Armbrüster, Marc; Weidenkaff, Anke

doi:10.1016/j.cattod.2015.01.002

Methanol steam reforming on LaCo₁₋_x₋_yPd_xZn_yO_3±_δ

Kuc J, Matam SK, Neumann M, Yoon S, Thiel P, Armbrüster M & Weidenkaff A

Citation

Kuc, J., Matam, S. K., Neumann, M., Yoon, S., Thiel, P., Armbrüster, M., & Weidenkaff, A. (2015). Methanol steam reforming on LaCo₁₋_x₋_yPd_xZn_yO_3±_δ. Catalysis Today, 258, 256-261. https://doi.org/10.1016/j.cattod.2015.01.002

Persistent URL https://www.dora.lib4ri.ch/empa/islandora/object/empa:7031

Perovskite-type oxides LaCo₁₋_x₋_yPd_xZn_yO_3±_δ are studied for the methanol steam reforming (MSR) reaction. LaCo₁₋_x₋_yPd_xZn_yO_3±_δ with and without Co substitution by Pd and/or Zn are synthesized by the amorphous citrate method. The effect of substitution on the reducibility of the materials is investigated by in situ XRD and differential thermal/thermogravimetric analysis (DTA/TG) during temperature programmed reduction (TPR) with hydrogen. From this, the phase composition evolving as a function of temperature is determined. The TPR data indicate that the reducibility of the materials strongly depends on the substituent, i.e., Pd or Zn. The former increases the reducibility, while substitution by Zn decreases the reducibility. Materials containing both Pd and Zn exhibit intermediate reducibility as compared to the un-substituted LaCoO_3±_δ (LCO) and mono-metal substituted LaCo_0.873Pd_0.127O_3±_δ (LCPO) and LaCo_0.89Zn_0.11O_3±_δ (LCZO). In general, the metal ions in the materials are completely reduced at 590 °C, except La₂O₃. After reductive pre-treatment at 590 °C for 2 h, the MSR performance of the materials is evaluated between 150 and 400 °C while keeping comparable CH₃OH conversion to assess the product-concentration-dependent CO₂ selectivity. These results confirm that the CO₂ selectivity is strongly dependent on the material composition. For example, the un-substituted LCO, LCPO and LCZO show a CO₂ selectivity of around 13% at 300 °C, while it is improved to 80% on both Pd and Zn containing LaCo_0.85Pd_0.075Zn_0.075O_3±_δ (LCPZO-15).