Ruthenium catalyst supported on perovskite-type alkaline earth metal-titanates with strong metal-support interaction for ammonia decomposition

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry Pub Date : 2025-03-29 DOI:10.1016/j.jechem.2025.03.026

Dexing Li , Zhili Yin , Peixian Wang, Ziqing Wang, Qin Wu, Zhong Wei

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引用次数: 0

Abstract

Alkaline earth-metal titanates ATiO₃ (A = Ca, Sr, and Ba) with a perovskite-type structure were used as supports for Ru-based catalysts to produce CO_x-free H₂ via NH₃ decomposition. The effects of alkaline-earth metals on the physicochemical characteristics and catalytic activities of Ru/ATiO₃ for NH₃ decomposition were investigated using various techniques. The order of Ru/ATiO₃ for NH₃ conversion is Ru/BaTiO₃ > Ru/SrTiO₃ > Ru/CaTiO₃ > Ru/TiO₂ at the identical conditions, with the Ru/BaTiO₃ catalyst demonstrating the highest NH₃ conversion of 77.8% at 450 °C and a gas hourly space velocity of 30,000 mL/g_cat/h, which is 8.7, 2.1, and 1.3 times of that over Ru/TiO₂, Ru/CaTiO₃, and Ru/SrTiO₃, respectively. The formation of the ATiO₃ phase can enrich the concentration of basic sites and oxygen vacancies compared with TiO₂, which can induce the presence of strong metal-support interaction (SMSI) through the formation of Ru–O–Ti bonds. This SMSI effect increased the dispersion and electron density of Ru nano-particles on ATiO₃ supports, and the electron-rich Ru nano-particles could weaken the chemisorptive strength of N₂ and H₂ on the Ru/ATiO₃ catalysts, thereby promoting the reaction rate for NH₃ decomposition.

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来源期刊

Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL

CiteScore

19.10

自引率

8.40%

发文量

3631

审稿时长

15 days

期刊介绍： The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy