Monoliths washcoated with AuCu catalysts for CO removal in an ethanol fuel processor: Effect of CeO2–SiO2 dual support on the catalytic performance and reactor cost. (6th January 2021)

• Record Type: Journal Article
• Authors: Cifuentes, Bernay; Cifuentes, Alejandro; Bustamante, Felipe; Soler, Lluis; Llorca, Jordi; Cobo, Martha
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 2(2021)
• Page Start: 2166
• Page End: 2181
• Publication Date: 2021-01-06
• Subjects: Bioethanol fuel processor unit -- Computational fluid dynamics -- CO oxidation -- H2 oxidation -- Structured catalysts -- Water gas shift; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.10.122
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: CO removal from a syngas was evaluated in a single catalytic unit using structured AuCu/CeO2 –SiO2 catalysts. Initially, AuCu/CeO2 –SiO2 powder catalysts with several SiO2 loadings (0–100 mol%) were assessed. SiO2 addition into AuCu/CeO2 increased the surface area by up to 3.4 times and reduced its cost by up to 60%, but reduced CO conversion. On the other hand, the AuCu/CeO2 –SiO2 catalyst washcoated on monolith outperformed the powder samples at temperatures above 260 °C. In particular, outlet CO concentrations adequate to feed high temperature fuel cells were obtained with monoliths washcoated with AuCu/CeO2 (0.2% CO) and AuCu/CeO2 –SiO2 with 75 mol% of SiO2 (3.6% CO). Furthermore, the Au/CeO2 –SiO2 monolith (14 $/gcat ) is 36% cheaper than the AuCu/CeO2 monolith, paving the road to the development of compact and economic H2 cleanup processes. Graphical abstract: Image 1 Highlights: CO removal on powder catalysts and monoliths in a single catalytic unit was studied. Effect of SiO2 addition on cost and activity of AuCu/CeO2 –SiO2 system was assessed. SiO2 has a positive effect on the catalyst cost, but also impacts CO conversion. Monoliths improve activity with similar cost compared to non-structured samples. Monoliths based on AuCu catalysts ensure CO concentrations <5% in purified syngas.