Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Catalysts

Bernay Cifuentes¹  Martha Cobo¹  Felipe Bustamante² 

[1] Energy, Materials, and Environment Laboratory, Chemical Engineering Department, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá 250001, Colombia;Environmental Catalysis Research Group, Chemical Engineering Department, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia;

关键词: co-prox;    co-smet;    co₂ methanation;    hydrogen purification;    process integration;   

DOI  :  10.3390/catal9100852

来源: DOAJ

【 摘 要 】

A catalytic screening was performed to determine the effect of the support on the performance of an Au−Cu based system for the removal of CO from an actual syngas. First, a syngas was obtained from reforming of ethanol. Then, the reformer outlet was connected to a second reactor, where Au−Cu catalysts supported on several single and dual metal oxides (i.e., CeO₂, SiO₂, ZrO₂, Al₂O₃, La₂O₃, Fe₂O₃, CeO₂-SiO₂, CeO₂-ZrO₂, and CeO₂-Al₂O₃) were evaluated. AuCu/CeO₂ was the most active catalyst due to an elevated oxygen mobility over the surface, promoting CO₂ formation from adsorption of C−O* and OH⁻ intermediates on Au⁰ and CuO species. However, its lower capacity to release the surface oxygen contributes to the generation of stable carbon deposits, which lead to its rapid deactivation. On the other hand, AuCu/CeO₂-SiO₂ was more stable due to its high surface area and lower formation of formate and carbonate intermediates, mitigating carbon deposits. Therefore, use of dual supports could be a promising strategy to overcome the low stability of AuCu/CeO₂. The results of this research are a contribution to integrated production and purification of H₂ in a compact system.

【 授权许可】

Unknown