Hydrogen production by autothermal reforming of methane over lanthanum chromites modified with Ru and Sr

摘要

The partial substitution of La by Sr in lanthanum chromites (La1-ySryCr0.85Ru0.15O3, y = 0.01, 0.02, 0.05) produced changes in the size, insertion degree of Ru and oxygen vacancies of the perovskite structure. The surface and structural modifications of the La1-ySryCr0.85Ru0.15O3 perovskites brought about by substitution of La by Sr directly affected the catalytic behaviour of the perovskites in the autothermal reforming of methane (ATR). It was found that all La1-ySryCr0.85Ru0.15O3 perovskites showed excellent ATR activity that it increased with the Sr substitution degree in the perovskite. The most active Sr-substituted chromite also showed high stability and thiotolerance in the long ATR durability test in the presence of 50 ppm of sulphur. Characterization of used samples revealed not only good structural stability of the Sr-substituted perovskites under the ATR conditions but also absence of carbon deposition on the surface of used catalyst in the ATR reaction. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.