Double perovskite type catalysts with improved anti-coking and sulfur-resisting performance for diesel reforming

• Published in: International journal of hydrogen energy Vol. 48; no. 27; pp. 9929 - 9944
• Main Authors: Luo, Hongjian, Li, Yan, Li, Tao, Wang, Zhijin, Wang, Linhai, Liu, Yun-Quan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 29.03.2023
• Subjects: Anti-coking; Diesel reforming; Double perovskites; Sol-gel method; Sulfur resisting; Anti-coking; Sulfur resisting; Double perovskites; Diesel reforming; Sol-gel method
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.11.310

Double perovskite type catalysts with the formula of La2CoxFe2-xO5+δ, x = 1.5, 1 and 0.5 were synthesized through a modified sol-gel method, which were used for steam reforming of n-hexadecane (a diesel surrogate) containing 50 μg/g sulfur. The prepared catalysts were found to have the significantly improved performance in both anti-coking and sulfur-resisting. Characterizations with XRD, SEM-EDS, XPS, H2-TPR, thermogravimetric analysis (TGA) and nitrogen adsorption-desorption revealed that the special structure of double perovskite minimized coke formation and improved sulfur resisting, as more oxygen vacancies are generated due to the consumption of surface oxygen, which provides an efficient channel for oxygen diffusion. The effect of different molar ratios of Co to Fe on catalyst activity was also studied, and the catalyst LCF-2 (for x = 1) with a porous structure had the best catalytic activity and stability, achieving a continuous runtime of more than 40 h, better than the single perovskite catalyst LaCo0.5Fe0.5O3. •Innovative double-perovskite type catalysts for diesel reforming were synthesized.•Substitution of Co with Fe in catalyst is found important to catalytic performance.•The La2CoxFe2-xO5+δ catalyst exhibited an excellent resistance to carbon deposition.•This catalyst also demonstrated a remarkable sulfur tolerance in reforming.•This catalyst had achieved a continuous runtime of 40 h without deactivation.