3 years ago

Molecular Reactions of O2 and CO2 on Ionically Conducting Catalyst

Molecular Reactions of O2 and CO2 on Ionically Conducting Catalyst
Christopher Pellegrinelli, Yi-Lin Huang, Eric D. Wachsman, Mann Sakbodin
The presence of CO2, an unavoidable component in air and fuel environments, is known to cause severe performance degradation in oxide catalysts. Understanding the interactions between O2, CO2, and ion-conducting oxides is critical to developing energy-conversion devices. Here, surface reaction kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) with the presence of both O2 and CO2 is determined using gas-phase isotope exchange. BSCF actively reacts with CO2, and the incorporation of oxygen from CO2 to the lattice of BSCF is directly observed as low as 50 °C. Above 200 °C, the reaction between CO2 and the BSCF surface dominates and is independent of the oxygen partial pressure. In addition, CO2 competes with O2 for binding to vacancy sites, forming surface intermediate species. Surprisingly, these surface intermediate species offer oxygen to exchange with oxygen in gaseous O2 and CO2, inhibiting the interactions between O2 and the solid surface. This work provides fundamental insight into functioning oxide catalysts, and the results can be applied to the design of improved oxide catalysts.

Publisher URL: http://dx.doi.org/10.1021/acscatal.7b03467

DOI: 10.1021/acscatal.7b03467

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.