High Performance Ru-Doped Sr0.90La0.10TiO3 Catalyst for CH4 Dry Reforming

Abstract

The reduction of atmospheric CO₂ emissions is considered fundamental to reduce global warming. High-temperature fuel cells coupled with CH₄ reforming represent a promising solution that can utilize biogas for sustainable energy production and CO₂ capture. However, achieving high catalytic activity and long-term stability requires the development of highly durable and efficient catalysts. In this study, a series of Ru-doped Sr_0.90La_0.10Ti_1−xRu_xO₃ perovskite were synthesized and investigated. Under reducing conditions, Ru was successfully exsolved from the perovskite lattice forming dispersed nanoparticles strongly anchored to the catalyst surface. This process promoted the formation of oxygen vacancies enhancing CO₂ activation and generating an active metal-support interface. Among the investigated compositions, the catalyst with 5 mol% Ru exhibited the best balance between activity, stability and Ru utilization. This sample demonstrated stable CH₄ and CO₂ conversion rates over 1,300 h at 700 °C with a reduction in performance of about 5% over 1,000 h. In addition, it showed excellent resistance to carbon deposition, with no detectable coking observed throughout the duration of the test. These findings position Sr_0.90La_0.10Ti_1−xRu_xO₃ as a promising candidate for integration into high-temperature fuel cell systems, offering both long-term stability and high efficiency under dry reforming conditions.