Green synthesis of carbon coated macrostructured catalysts: Optimized methodology and enhanced catalytic performance

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Santos, ASGG (Author) Other; Restivo, J (Author) Other; Carla Orge (Author) FEUP; Pereira, MFR (Author) Other; Soares, OSGP (Author) Other

Journal

Title: Applied Materials Today

Vol. 38

ISSN: 2352-9407

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-010-4SM

DOI: 10.1016/j.apmt.2024.102158

Abstract (EN): A novel green and efficient synthesis methodology for carbon-coated macrostructured catalysts was assessed. Sodium alginate was used as a dispersant to promote a suitable dispersion of the modified carbon nanotubes (CNT) to be incorporated on a structured support. The coating conditions were optimized to synthesize active and stable carbon-coated macrostructured catalysts. Achieving a total dispersant decomposition was one of the key steps to guarantee the coating stability, 550 degrees C being the optimal temperature. To assess the catalytic activity for these catalysts, the carbon-coated structures were tested as main catalysts for oxalic acid degradation through ozonation, and as support for bimetallic Pd-Cu catalysts, applied in NO3- conversion. The results achieved during ozonation allowed to outperform the ones obtained with macrostructured catalysts synthesized by more established techniques (such as chemical vapor deposition) with oxalic acid degradation, in a continuous system, of around 75%. As for the bimetallic samples, the species proved to be quite dispersed on the catalyst support, allowing a NO3- conversion of around 20% with a corresponding N-2 selectivity of 55%, outperforming, again, the same type of catalyst synthesized with less green surfactants. This newly developed methodology is an important step for the sustainability of the structured catalyst design area.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11