Chemial looping reforming is an attractive process that can be used for conversion of hydrocarbons into syngas, an industrially important intermediate that serves as a building block for other value-added products. In chemical looping systems, oxygen carriers are required to have high reactivity, recyclability, and high oxygen carrying capacity. This work focuses on unsupported and MgO-supported Ca2Fe2O5 redox materials as oxygen carriers for simultaneous generation of syngas and high-purity hydrogen using a two-reactor chemical looping system. Experiments were conducted in thermogravimetric analyser to assess the performance of this material for long-term stability. The simulated co-current moving bed experiments were also conducted to evalaute the reactivity of this material for syngas and hydrogen co-generation. 10 redox cycles test indicated almost complete regeneration of reduced oxygen carriers while &gt;99% methane conversion with syngas selectivity of ~98% was obtained when 40% MgO supported Ca2Fe2O5 oxygen carrier sample was reduced in methane to produce syngas with H2:CO ratio of 2:1. The density functional theory calculations were used to investigate the mechanism underlying the reactivity and selectivity enhancement. It was found that the brownmillerite structure possessed by Ca2Fe2O5 enables the rapid oxygen vacancy formation that promotes the methane activation and conversion. These findings will contribute to the systematic design of high-performance redox materials and chemical looping processes for syngas and hydrogen co-generation without releasing CO2.

MgO-supported calcium ferrite redox materials for enhanced syngas and hydrogen co-generation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.