Abstract
The perovskite-type oxides LaCoO3±δ (LCO) with and without substitution of Co by Pd and/or Zn are studied for steam reforming of methanol (SRM). The catalysts LaCo1−x−yPdxZnyO3±δ are synthesized by amorphous citrate method and subjected to calcination at 800 °C for 2 h. The catalysts are characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), N2-physisorption (BET), X-ray diffraction (XRD) and tested in SRM reaction. The surface area of the catalysts is around 9 (±1) m2/g. The XRD patterns of the catalysts reflect only rhombohedral crystal structure, indicating the phase purity of the perovskites. The SRM performance of the catalysts, especially the CO2 selectivity below 275 °C, is strongly dependent on the catalyst composition and reaction temperature. The CO2 selectivity profile of Pd and Zn containing LaCo0.85Pd0.075Zn0.075O3±δ consists of two distinct maxima, one at 225 °C and the other above 375 °C. The former is missing on un-substituted LCO or mono metal substituted LaCo0.87Pd0.13O3±δ and LaCo0.89Zn0.11O3±δ, which is attributed to CO2 selective phase related to Pd and Zn. The high temperature CO2 selectivity maximum of the catalysts is not dependent on the Co substitution by Pd and/or Zn and is ascribed, in general, to the bulk catalyst composition.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
